{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "nitrogen-generator",
  "type": "registry:component",
  "title": "Membrane nitrogen generator",
  "description": "Hollow-fibre membrane nitrogen package: inlet block valve, coalescing, fine-coalescing and activated-carbon filters with auto drains to a drip tray, flanged electric air heater with TT, a framed rack of membrane modules with feed, product and permeate headers, a permeate / off-spec vent riser, O2 analyser cabinet with sample rotameter, product pressure-control valve and 3-way off-spec valve, and a buffer receiver with PSV, gauge, transmitter and drain. `modules` sets the rack size.",
  "dependencies": [
    "three",
    "@react-three/fiber",
    "@react-three/drei"
  ],
  "registryDependencies": [
    "https://deck-twin-library.demoareeb.workers.dev/r/core.json"
  ],
  "files": [
    {
      "path": "packages/nitrogen-generator.tsx",
      "type": "registry:file",
      "target": "components/deck-twin/packages/nitrogen-generator.tsx",
      "content": "// Membrane nitrogen generator package: coalescing / carbon filters, air heater, hollow-fibre membrane rack, O2 analyser with off-spec vent, buffer receiver. ISO 8573-1, ASME VIII-1.\nimport { Kit, type MatKey } from '../lib/kit'\nimport { KitMesh, useKit, type GroupProps } from '../lib/mesh'\nimport { paint } from '../lib/materials'\nimport { gauge, member, nozzle, pipeRun, skid, tagPlate } from '../lib/parts'\nimport { port, type Port } from '../lib/ports'\nimport { SECTIONS, flange as flangeDims, pipeOD, shellThickness, type Rating } from '../lib/standards'\nimport { textMaterial } from '../lib/textures'\nimport { addv, blFlange, branchMouth, cableTray, dripPan, earthBoss, localPanel, mateFlange, padeyeShackles, pipeSupport, shellLabel, smallPsv, smallValve, spoolJoint, tempElement, transmitter, vVessel, vesselLegs, valve, valveSpan } from './_skid'\n\nexport interface NitrogenGeneratorProps {\n  /** membrane modules in the rack */\n  modules?: number\n  /** buffer receiver inside diameter, m */\n  receiverDiameter?: number\n  /** buffer receiver tangent height, m */\n  receiverHeight?: number\n  /** design pressure, barg */\n  pressure?: number\n  airNps?: number\n  n2Nps?: number\n  tag?: string\n}\n\nexport const defaults = {\n  modules: 6,\n  receiverDiameter: 0.8,\n  receiverHeight: 1.8,\n  pressure: 13,\n  airNps: 2,\n  n2Nps: 1.5,\n  tag: 'X-8300',\n}\n\ntype P = typeof defaults\n\nconst SKID = 'HEB 160'\nconst R150: Rating = 150\nconst MEM: MatKey = paint('#d8dbd6', { metalness: 0.35, roughness: 0.4 })\nconst CAP: MatKey = paint('#2a6f4f', { metalness: 0.3, roughness: 0.45 })\n\nfunction layout(p: P) {\n  const Nm = Math.max(2, Math.min(16, Math.round(p.modules)))\n  const rows = Nm > 8 ? 2 : 1\n  const perRow = Math.ceil(Nm / rows)\n  const wall = shellThickness(p.pressure, p.receiverDiameter)\n  const Ro = p.receiverDiameter / 2 + wall\n  const xF = [0.75, 1.15, 1.55]\n  const xH0 = 1.9\n  const xH1 = 2.6\n  const xm0 = 3.05\n  const pitch = 0.27\n  const xm1 = xm0 + pitch * (perRow - 1)\n  const xR = xm1 + 0.75 + Ro\n  const L0 = xR + Ro + 0.75\n  const W = Math.max(1.7, 2 * Ro + 0.9)\n  const a = -L0 / 2\n  const y0 = SECTIONS[SKID].d + 0.008\n  const yp = y0 + 1.15\n  const zP = -0.42\n  const yTL = y0 + 0.4 + p.receiverDiameter / 4 + wall\n  return { Nm, rows, perRow, wall, Ro, xF: xF.map((x) => a + x), xH0: a + xH0, xH1: a + xH1, xm0: a + xm0, xm1: a + xm1, pitch, xR: a + xR, L: L0, W, a, y0, yp, zP, yTL, yOut: yTL + p.receiverHeight * 0.75, xVent: a + xm0 - 0.4, yVent: y0 + 2.75, zVent: -0.15 }\n}\n\nexport function ports(props: NitrogenGeneratorProps = {}): Port[] {\n  const p = { ...defaults, ...props }\n  const g = layout(p)\n  return [\n    port('air-in', 'Compressed air in', [-g.L / 2, g.yp, g.zP], [-1, 0, 0], p.airNps, R150, 'utility'),\n    port('n2-out', 'Nitrogen out', [g.L / 2, g.yOut, 0], [1, 0, 0], p.n2Nps, R150, 'utility'),\n    port('vent', 'Permeate / off-spec vent', [g.xVent, g.yVent, g.zVent], [0, 1, 0], 2, R150, 'vent'),\n  ]\n}\n\nexport function NitrogenGenerator(props: NitrogenGeneratorProps & GroupProps) {\n  const { modules, receiverDiameter, receiverHeight, pressure, airNps, n2Nps, tag, ...group } = { ...defaults, ...props }\n  const p = { modules, receiverDiameter, receiverHeight, pressure, airNps, n2Nps, tag }\n  const data = useKit((k) => build(k, p), Object.values(p))\n  return (\n    <group {...group}>\n      <KitMesh data={data} />\n    </group>\n  )\n}\n\nexport default NitrogenGenerator\n\nfunction build(k: Kit, p: P) {\n  const g = layout(p)\n  const { L, W, y0, yp, zP, a } = g\n  const na = p.airNps\n  const od = pipeOD(na)\n  skid(k, L, W, SKID)\n  padeyeShackles(k, L, W, y0)\n  tagPlate(k, p.tag, [a + 0.7, SECTIONS[SKID].d * 0.5, W / 2 + 0.002], 'z', 0.3)\n  earthBoss(k, [-a - 0.4, SECTIONS[SKID].d * 0.5, W / 2], [0, 0, 1])\n\n  // air inlet: BL → ball valve → coalescer, fine coalescer, activated carbon (auto drains to a tray)\n  const iw = blFlange(k, [-L / 2, yp, zP], [-1, 0, 0], na, R150)\n  const Sv = valveSpan('ball', na, R150)\n  const xv = a + 0.3 + Sv / 2\n  pipeRun(k, [iw, [xv - Sv / 2, yp, zP]], na)\n  valve(k, 'ball', [xv, yp, zP], [1, 0, 0], na, R150)\n  const names = ['COALESCER', 'FINE COALESCER', 'CARBON']\n  let x = xv + Sv / 2\n  g.xF.forEach((fx, i) => {\n    pipeRun(k, [[x, yp, zP], [fx - 0.1, yp, zP]], na)\n    k.rbox('aluminium', [0.2, 0.15, 0.15], 0.02, [fx, yp, zP])\n    k.cyl('aluminium', 0.08, 0.5, [fx, yp - 0.33, zP], 'y', 24)\n    k.cyl('aluminium', 0.085, 0.04, [fx, yp - 0.1, zP], 'y', 24)\n    k.rbox('rubberBlack', [0.05, 0.06, 0.05], 0.008, [fx, yp - 0.64, zP])\n    k.tube('tubing', [[fx, yp - 0.67, zP], [fx, y0 + 0.07, zP], [fx, y0 + 0.07, zP + 0.32]], 0.005, 6, 0.04)\n    gauge(k, [fx, yp + 0.13, zP + 0.02], 'z', 0.06, 'bar', 1)\n    k.rod('stainless', [fx, yp + 0.075, zP], [fx, yp + 0.13, zP], 0.006, 6)\n    k.plane(textMaterial(names[i], '#2a6f4f', '#fff', 256, 64), 0.13, 0.032, [fx, yp - 0.3, zP + 0.081])\n    member(k, [fx, y0, zP - 0.16], [fx, yp - 0.08, zP - 0.16], 'L50x50x5', 'galvanised', [0, 0, 1])\n    k.box('galvanised', [0.05, 0.05, 0.12], [fx, yp - 0.05, zP - 0.1])\n    k.box('galvanised', [0.12, 0.012, 0.12], [fx, y0 + 0.006, zP - 0.16])\n    x = fx + 0.1\n  })\n  dripPan(k, (g.xF[0] + g.xF[2]) / 2, zP + 0.35, g.xF[2] - g.xF[0] + 0.5, 0.3, y0, 0.05)\n\n  // electric air heater (flanged, terminal box, TT / TSH) ahead of the membranes\n  const fj = flangeDims(na, R150).hubLength + flangeDims(na, R150).raisedFaceHeight + 0.00225\n  pipeRun(k, [[x, yp, zP], [g.xH0 - fj, yp, zP]], na)\n  spoolJoint(k, [g.xH0, yp, zP], [1, 0, 0], na, R150)\n  spoolJoint(k, [g.xH1, yp, zP], [1, 0, 0], na, R150)\n  k.cyl('equipmentPaint', 0.13, g.xH1 - g.xH0 - 2 * fj + 0.01, [(g.xH0 + g.xH1) / 2, yp, zP], 'x', 32)\n  k.rbox('equipmentPaintDark', [0.3, 0.22, 0.2], 0.02, [(g.xH0 + g.xH1) / 2, yp + 0.24, zP])\n  k.box('equipmentPaintDark', [0.1, 0.06, 0.1], [(g.xH0 + g.xH1) / 2, yp + 0.11, zP])\n  k.plane(textMaterial('AIR HEATER', '#f2f2ee', '#111', 256, 64), 0.2, 0.05, [(g.xH0 + g.xH1) / 2, yp, zP + 0.132])\n  for (const hx of [g.xH0 + 0.15, g.xH1 - 0.15]) {\n    k.box('galvanised', [0.08, yp - 0.13 - y0, 0.2], [hx, (yp - 0.13 + y0) / 2, zP])\n    k.box('galvanised', [0.14, 0.012, 0.26], [hx, y0 + 0.006, zP])\n  }\n  tempElement(k, [g.xH1 + 0.15, yp, zP], [0, 1, 0], od)\n\n  // ---------------------------------------------------------------- membrane rack\n  const yb = y0 + 0.42\n  const hM = 1.6\n  const rM = 0.075\n  const zRows = g.rows === 2 ? [-0.12, 0.2] : [0.05]\n  const yFeed = yb - 0.14\n  const yN2 = yb + hM + 0.14\n  const zVh = zRows[0] - 0.17\n  pipeRun(k, [[g.xH1 + fj, yp, zP], [g.xH1 + 0.3, yp, zP], [g.xH1 + 0.3, yFeed, zP], [g.xH1 + 0.3, yFeed, zRows[0]], [g.xm1 + 0.1, yFeed, zRows[0]]], 1.5)\n  for (const z of zRows.slice(1)) k.pipe('pipePaint', [g.xm0 - 0.1, yFeed, z], [g.xm1 + 0.1, yFeed, z], pipeOD(1.5), 0.004)\n  if (zRows.length > 1) k.pipe('pipePaint', [g.xm0 - 0.05, yFeed, zRows[0]], [g.xm0 - 0.05, yFeed, zRows[1]], pipeOD(1.5), 0.004)\n  for (const z of zRows) k.pipe('pipePaint', [g.xm0 - 0.1, yN2, z], [g.xm1 + 0.35, yN2, z], pipeOD(1.5), 0.004)\n  for (const z of zRows) {\n    k.dome('pipePaint', pipeOD(1.5) / 2, [g.xm0 - 0.1, yN2, z], '-x', Math.PI / 2, 0.5, 16)\n    k.dome('pipePaint', pipeOD(1.5) / 2, [g.xm1 + 0.1, yFeed, z], 'x', Math.PI / 2, 0.5, 16)\n  }\n  if (zRows.length > 1) k.dome('pipePaint', pipeOD(1.5) / 2, [g.xm0 - 0.1, yFeed, zRows[1]], '-x', Math.PI / 2, 0.5, 16)\n  if (zRows.length > 1) k.dome('pipePaint', pipeOD(1.5) / 2, [g.xm1 + 0.35, yN2, zRows[0]], 'x', Math.PI / 2, 0.5, 16)\n  k.pipe('pipePaint', [g.xm0 - 0.1, yb + 0.25, zVh], [g.xVent + pipeOD(2) / 2 - 0.004, yb + 0.25, zVh], pipeOD(2), 0.004)\n  k.dome('pipePaint', pipeOD(2) / 2, [g.xm0 - 0.1, yb + 0.25, zVh], '-x', Math.PI / 2, 0.5, 16)\n  let n = 0\n  for (const z of zRows)\n    for (let i = 0; i < g.perRow; i++) {\n      if (n++ >= g.Nm) break\n      const mx = g.xm0 + g.pitch * i\n      k.cyl(MEM, rM, hM - 0.16, [mx, yb + hM / 2, z], 'y', 24)\n      for (const y of [yb + 0.04, yb + hM - 0.04]) {\n        k.cyl(CAP, rM + 0.018, 0.08, [mx, y, z], 'y', 24)\n        k.around(6, rM + 0.008, [mx, y + (y > yb + 1 ? 0.045 : -0.045), z], 'y', (q) => k.hex('nut', 0.016, 0.01, q))\n      }\n      k.rod('stainless', [mx, yb, z], [mx, yFeed, z], 0.014, 10)\n      k.rod('stainless', [mx, yb + hM, z], [mx, yN2, z], 0.014, 10)\n      k.rod('stainless', [mx, yb + 0.25, z - rM], [mx, yb + 0.25, zVh], 0.016, 10) // permeate port\n      k.plane(textMaterial('N2 MEMBRANE', '#2a6f4f', '#fff', 256, 48), 0.1, 0.019, [mx, yb + hM * 0.6, z + rM + 0.002])\n    }\n  // rack frame with clamp beams\n  const zF0 = zRows[0] - 0.12\n  const zF1 = zRows[zRows.length - 1] + 0.12\n  for (const xx of [g.xm0 - 0.16, g.xm1 + 0.16]) for (const z of [zF0, zF1]) {\n    member(k, [xx, y0, z], [xx, yN2 + 0.1, z], 'L60x60x6', 'galvanised', [1, 0, 0])\n    k.box('galvanised', [0.12, 0.012, 0.12], [xx, y0 + 0.006, z])\n  }\n  for (const y of [yb + 0.4, yb + hM - 0.4]) for (const z of [zF0, zF1]) member(k, [g.xm0 - 0.16, y, z], [g.xm1 + 0.16, y, z], 'L50x50x5', 'galvanised', [0, 1, 0])\n  // permeate / off-spec vent riser to the vent flange (port)\n  const vf = flangeDims(2, R150)\n  const vw = addv([g.xVent, g.yVent, g.zVent], [0, -1, 0], vf.hubLength + vf.raisedFaceHeight)\n  blFlange(k, [g.xVent, g.yVent, g.zVent], [0, 1, 0], 2, R150)\n  pipeRun(k, [[g.xVent, yb + 0.25, zVh - 0.1], [g.xVent, yb + 0.25, g.zVent], vw], 2)\n  k.dome('pipePaint', pipeOD(2) / 2, [g.xVent, yb + 0.25, zVh - 0.1], '-z', Math.PI / 2, 0.5, 16)\n  branchMouth(k, [g.xVent + pipeOD(2) / 2 - 0.0035, yb + 0.25, zVh], [1, 0, 0], 2)\n  k.box('galvanised', [0.06, g.yVent - 0.4 - y0, 0.06], [g.xVent - 0.1, (g.yVent - 0.4 + y0) / 2, g.zVent])\n  k.box('galvanised', [0.14, 0.04, 0.04], [g.xVent - 0.04, g.yVent - 0.5, g.zVent])\n\n  // ---------------------------------------------------------------- O2 analyser cabinet, product control, off-spec valve\n  const xa = (g.xm0 + g.xm1) / 2\n  const gl = localPanel(k, [xa, y0, W / 2 - 0.35], [0, 0, 1], { w: 0.65, h: 0.75, top: 1.9, title: 'N2 GENERATOR / O2 ANALYSER', buttons: 3 })\n  k.cyl('glass', 0.018, 0.16, [xa + 0.42, y0 + 1.45, W / 2 - 0.12], 'y', 12) // sample rotameter\n  for (const s of [-1, 1]) k.cyl('stainless', 0.022, 0.02, [xa + 0.42, y0 + 1.45 + s * 0.09, W / 2 - 0.12], 'y', 12)\n  k.tube('tubing', [[g.xm1 + 0.2, yN2, zRows[zRows.length - 1]], [g.xm1 + 0.2, yN2, W / 2 - 0.12], [xa + 0.42, yN2, W / 2 - 0.12], [xa + 0.42, y0 + 1.54, W / 2 - 0.12]], 0.004, 6, 0.03)\n  k.tube('tubing', [[xa + 0.42, y0 + 1.36, W / 2 - 0.12], [xa + 0.42, y0 + 1.25, W / 2 - 0.12], [xa + 0.33, y0 + 1.25, W / 2 - 0.12]], 0.004, 6, 0.02)\n  const zN = zRows[zRows.length - 1]\n  const xPc = g.xm1 + 0.35\n  const Sg = valveSpan('globe', 1.5, R150)\n  pipeRun(k, [[xPc, yN2, zN], [xPc + 0.2, yN2, zN], [xPc + 0.2, yN2 - 0.3, zN]], 1.5)\n  valve(k, 'globe', [xPc + 0.2, yN2 - 0.3 - Sg / 2, zN], [0, -1, 0], 1.5, R150, [-1, 0, 0], 'valveBody', 1, 'diaphragm')\n  const yB = yN2 - 0.3 - Sg\n  k.rbox('actuatorYellow', [0.12, 0.12, 0.1], 0.015, [xPc + 0.2, yB - 0.12, zN]) // 3-way off-spec solenoid valve\n  k.rbox('valveBody', [0.1, 0.1, 0.1], 0.01, [xPc + 0.2, yB - 0.22, zN])\n  k.tube('pipePaint', [[xPc + 0.2, yB - 0.22, zN - 0.05], [xPc + 0.2, yB - 0.22, zVh], [g.xm1 + 0.05, yB - 0.22, zVh], [g.xm1 + 0.05, yb + 0.25, zVh]], 0.02, 10, 0.05)\n  k.pipe('pipePaint', [xPc + 0.2, yB, zN], [xPc + 0.2, yB - 0.17, zN], pipeOD(1.5), 0.004)\n  transmitter(k, [xPc + 0.1, yN2 + pipeOD(1.5) / 2, zN], [0, 1, 0], 0.06)\n\n  // ---------------------------------------------------------------- buffer receiver\n  const R = vVessel(k, g.xR, 0, g.yTL, p.receiverDiameter, p.receiverHeight, g.wall, 'equipmentPaint')\n  vesselLegs(k, g.xR, 0, g.Ro, g.yTL + 0.12, y0, 3, 'equipmentPaint', Math.PI / 2)\n  shellLabel(k, 'NITROGEN', g.xR, g.yTL + p.receiverHeight * 0.55, 0, g.Ro, g.Ro * 0.22, 1.1, '#2a6f4f')\n  const yIn = g.yTL + p.receiverHeight * 0.3\n  const inFace = nozzle(k, { base: [g.xR - g.Ro, yIn, 0], dir: [-1, 0, 0], nps: 1.5, rating: R150, standout: 0.2, mat: 'equipmentPaint', studs: false })\n  const inW = mateFlange(k, inFace, [-1, 0, 0], 1.5, R150)\n  pipeRun(k, [[xPc + 0.2, yB - 0.27, zN], [xPc + 0.2, yIn, zN], [xPc + 0.2, yIn, 0], inW], 1.5)\n  const Sv2 = valveSpan('ball', p.n2Nps, R150)\n  const xo = g.xR + g.Ro + 0.18\n  k.pipe('equipmentPaint', [g.xR + g.Ro - 0.02, g.yOut, 0], [xo, g.yOut, 0], pipeOD(p.n2Nps), 0.004)\n  valve(k, 'ball', [xo + Sv2 / 2, g.yOut, 0], [1, 0, 0], p.n2Nps, R150)\n  const ow = blFlange(k, [L / 2, g.yOut, 0], [1, 0, 0], p.n2Nps, R150)\n  pipeRun(k, [[xo + Sv2, g.yOut, 0], ow], p.n2Nps)\n  k.pipe('equipmentPaint', [g.xR, R.yTop - 0.02, 0], [g.xR, R.yTop + 0.08, 0], 0.05, 0.005)\n  const po = smallPsv(k, [g.xR, R.yTop + 0.08, 0], [0, 0, -1], 0.026)\n  k.tube('pipePaint', [po, addv(po, [0, 0, -0.08]), addv(addv(po, [0, 0, -0.08]), [0, 0.15, 0])], 0.018, 8, 0.04)\n  k.tube('pipePaint', [[g.xR + 0.2, R.yTop - 0.06, 0], [g.xR + 0.2, R.yTop + 0.1, 0]], 0.01, 8)\n  gauge(k, [g.xR + 0.2, R.yTop + 0.16, 0.02], 'z', 0.1, 'bar', 16)\n  transmitter(k, [g.xR - g.Ro * 0.7, g.yTL + p.receiverHeight * 0.7, g.Ro * 0.7], [-0.7, 0, 0.7], 0.12)\n  k.tube('pipePaint', [[g.xR, R.yBot + 0.01, 0], [g.xR, y0 + 0.2, 0], [g.xR, y0 + 0.2, -g.Ro - 0.1]], 0.012, 8, 0.04)\n  smallValve(k, 'ball', [g.xR, y0 + 0.2, -g.Ro * 0.5], [0, 0, -1], 0.01)\n  tagPlate(k, 'ASME VIII-1', [g.xR - g.Ro * 0.5, g.yTL + p.receiverHeight * 0.35, g.Ro * 0.87 + 0.002], [-0.5, 0, 0.87], 0.16)\n\n  // supports and cable tray\n  for (const sx of [g.xH0 - 0.25]) pipeSupport(k, [sx, yp, zP], od, y0, 'x')\n  const tz = W / 2 - 0.12\n  cableTray(k, [[xa, gl[1] - 0.04, gl[2]], [xa, y0 + 0.22, gl[2]], [xa, y0 + 0.22, tz], [g.xH0, y0 + 0.22, tz]], [1, 0, 0], 0.15, 2)\n  k.spline('cable', [[g.xH0, y0 + 0.24, tz], [(g.xH0 + g.xH1) / 2, y0 + 0.5, 0.0], [(g.xH0 + g.xH1) / 2, yp + 0.13, zP + 0.1]], 0.01, 6, 16)\n}\n"
    },
    {
      "path": "packages/_skid.ts",
      "type": "registry:file",
      "target": "components/deck-twin/packages/_skid.ts",
      "content": "// Shared package-skid parts: battery-limit flanges, in-kit valves, instruments, local panels, cable tray, supports, vessels, drip pans.\nimport * as THREE from 'three'\nimport { Kit, type MatKey, type V3 } from '../lib/kit'\nimport { flange, flangedJoint, gasket, gauge, member } from '../lib/parts'\nimport { faceToFace, flange as flangeDims, handwheelDia, headDepth, pipeOD, pipeWall, type Rating } from '../lib/standards'\nimport { lcdMaterial, textMaterial } from '../lib/textures'\n\nconst V = (v: V3) => new THREE.Vector3(...v)\nconst arr = (v: THREE.Vector3) => v.toArray() as V3\nexport const addv = (a: V3, d: V3, s = 1): V3 => [a[0] + d[0] * s, a[1] + d[1] * s, a[2] + d[2] * s]\n\n/** Local frame with +X along `dir` and +Y as close to `up` as possible, origin at `pos`. */\nexport function frame(pos: V3, dir: V3, up: V3 = [0, 1, 0]) {\n  const x = V(dir).normalize()\n  let u = V(up).normalize()\n  if (Math.abs(u.dot(x)) > 0.99) u = Math.abs(x.y) > 0.9 ? new THREE.Vector3(0, 0, 1) : new THREE.Vector3(0, 1, 0)\n  const z = new THREE.Vector3().crossVectors(x, u).normalize()\n  const y = new THREE.Vector3().crossVectors(z, x).normalize()\n  return new THREE.Matrix4().makeBasis(x, y, z).setPosition(V(pos))\n}\n\n/** Battery-limit weld-neck flange with studs, face at `face` pointing along `dir`. Returns the weld end for the neck pipe. */\nexport function blFlange(k: Kit, face: V3, dir: V3, nps: number, rating: Rating, studs = true): V3 {\n  const L = flange(k, nps, rating, face, dir, studs)\n  liner(k, nps, face, dir, L)\n  return addv(face, dir, -L)\n}\n\n/** Bore lining through a weld-neck flange (face to weld end) so a flange reads hollow when looked into. */\nexport function liner(k: Kit, nps: number, face: V3, dir: V3, len: number) {\n  const ro = pipeOD(nps) / 2\n  const ri = ro - pipeWall(nps, 'STD')\n  k.lathe('machined', [[ro * 0.88, 0], [ri, 0]], face, dir, 24)\n  k.lathe('pipeBore', [[ri, 0], [ri, -len]], face, dir, 24)\n}\n\nexport type ValveKind = 'ball' | 'gate' | 'globe' | 'check'\n\n/** Overall length of an in-kit flanged valve including both mating pipe flanges (weld end to weld end). */\nexport function valveSpan(kind: ValveKind, nps: number, rating: Rating) {\n  const f = flangeDims(nps, rating)\n  const fam = kind === 'ball' ? 'ball-full' : kind === 'check' ? 'swing-check' : kind\n  return faceToFace(fam, nps, rating) + 2 * (0.0045 + f.hubLength + f.raisedFaceHeight)\n}\n\n/**\n * Flanged valve centred at `pos` on a line along `dir`, operator towards `up`. Both mating pipe flanges, gaskets\n * and studs are included, so the line pipe stops at pos ± dir·valveSpan/2.\n */\nexport function valve(k: Kit, kind: ValveKind, pos: V3, dir: V3, nps: number, rating: Rating, up: V3 = [0, 1, 0], body: MatKey = 'valveBody', open = 1, op: 'manual' | 'mov' | 'diaphragm' = 'manual') {\n  const fam = kind === 'ball' ? 'ball-full' : kind === 'check' ? 'swing-check' : kind\n  const L = faceToFace(fam, nps, rating)\n  const f = flangeDims(nps, rating)\n  const D = pipeOD(nps)\n  const fl = f.thickness + f.raisedFaceHeight\n  k.with(frame(pos, dir, up), () => {\n    spoolJoint(k, [L / 2 + 0.00225, 0, 0], [1, 0, 0], nps, rating)\n    spoolJoint(k, [-L / 2 - 0.00225, 0, 0], [-1, 0, 0], nps, rating)\n    const inner = L / 2 - fl\n    const ri = D / 2 - pipeWall(nps, 'STD')\n    k.pipe(body, [-inner - 0.002, 0, 0], [inner + 0.002, 0, 0], D * 1.24, D * 0.62 - ri + 0.003, 28)\n    if (kind === 'ball') {\n      k.sphere(body, D * 0.82, [0, 0, 0], [1.05, 1, 1], 28)\n      for (const s of [-1, 1]) k.cyl(body, D * 0.78, 0.012, [s * D * 0.55, 0, 0], 'x', 28)\n      k.around(8, D * 0.7, [D * 0.55, 0, 0], 'x', (p) => k.hex('nut', 0.016, 0.01, addv(p, [0.008, 0, 0])))\n      const yTop = D * 0.95\n      k.cyl(body, D * 0.3, yTop - D * 0.6, [0, (yTop + D * 0.6) / 2, 0], 'y', 16)\n      k.cyl(body, D * 0.36, 0.012, [0, yTop, 0], 'y', 16)\n      if (op === 'mov') movActuator(k, yTop, D, body)\n      else if (nps <= 4) {\n        const lever = Math.max(0.15, handwheelDia('ball-full', nps, rating))\n        const a = (1 - open) * (Math.PI / 2)\n        k.cyl('nut', D * 0.12, 0.04, [0, yTop + 0.02, 0], 'y', 10)\n        k.box('actuatorRed', [lever, 0.012, 0.03], [(Math.cos(a) * lever) / 2 - Math.cos(a) * 0.02, yTop + 0.045, (-Math.sin(a) * lever) / 2], new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 1, 0), a))\n      } else {\n        const gb = Math.max(0.12, D * 0.7)\n        k.rbox(body, [gb, gb * 0.6, gb * 0.8], gb * 0.08, [0, yTop + gb * 0.3, 0])\n        k.cyl(body, gb * 0.15, gb * 0.5, [0, yTop + gb * 0.3, gb * 0.6], 'z', 12)\n        k.handwheel('handwheel', Math.max(0.3, gb * 1.8), [0, yTop + gb * 0.3, gb * 0.85], 'z', 5)\n      }\n    } else if (kind === 'check') {\n      k.sphere(body, D * 0.78, [0, 0, 0], [1.25, 1, 0.95], 24)\n      const yc = D * 0.72\n      k.cyl(body, D * 0.62, 0.04, [0, yc, 0], 'y', 24)\n      k.cyl(body, D * 0.66, 0.025, [0, yc + 0.032, 0], 'y', 24)\n      k.around(8, D * 0.58, [0, yc + 0.045, 0], 'y', (p) => k.hex('nut', 0.018, 0.012, p))\n      k.box('stainless', [D * 0.5, 0.002, D * 0.25], [0, 0, D * 0.79])\n    } else {\n      // gate / globe: bolted bonnet, yoke, rising stem, handwheel\n      if (kind === 'globe') k.sphere(body, D * 0.85, [0, 0, 0], [1.2, 1, 0.95], 24)\n      else k.add(body, new THREE.CylinderGeometry(1, 1, D * 1.5, 28), new THREE.Matrix4().compose(new THREE.Vector3(0, D * 0.15, 0), new THREE.Quaternion(), new THREE.Vector3(D * 0.62, 1, D * 0.72)))\n      const yb = kind === 'globe' ? D * 0.8 : D * 0.9\n      k.cyl(body, D * 0.62, 0.03, [0, yb, 0], 'y', 24)\n      k.around(8, D * 0.55, [0, yb + 0.02, 0], 'y', (p) => k.hex('nut', 0.018, 0.012, p))\n      const hB = Math.max(0.08, D * 0.9)\n      k.cyl(body, D * 0.3, hB, [0, yb + hB / 2, 0], 'y', 16, D * 0.22)\n      const yoke = Math.max(0.12, D * 1.3)\n      const y0 = yb + hB\n      for (const s of [-1, 1]) k.box(body, [Math.max(0.012, D * 0.12), yoke, Math.max(0.012, D * 0.1)], [s * D * 0.28, y0 + yoke / 2, 0])\n      k.box(body, [D * 0.7, Math.max(0.016, D * 0.12), D * 0.2], [0, y0 + yoke, 0])\n      if (op === 'diaphragm') {\n        // spring-opposed diaphragm actuator with positioner\n        const Ra = THREE.MathUtils.clamp(D * 1.6, 0.14, 0.3)\n        const ya = y0 + yoke + 0.02\n        k.cyl('stainless', Math.max(0.006, D * 0.05), yoke * 0.8, [0, y0 + yoke * 0.5, 0], 'y', 10)\n        k.lathe('actuatorBlue', [[0.02, 0], [Ra * 0.9, 0], [Ra, Ra * 0.12], [Ra, Ra * 0.18], [Ra * 0.9, Ra * 0.2]], [0, ya, 0], 'y', 32)\n        k.lathe('actuatorBlue', [[Ra * 0.9, Ra * 0.2], [Ra, Ra * 0.22], [Ra, Ra * 0.28], [Ra * 0.7, Ra * 0.55], [0.02, Ra * 0.6]], [0, ya, 0], 'y', 32)\n        k.around(12, Ra * 0.95, [0, ya + Ra * 0.2, 0], 'y', (p) => k.hex('nut', 0.014, 0.012, p))\n        k.rbox('aluminium', [0.1, 0.12, 0.06], 0.01, [D * 0.35 + 0.05, y0 + yoke * 0.5, 0.04])\n        k.tube('tubing', [[D * 0.35 + 0.05, y0 + yoke * 0.5 + 0.06, 0.04], [D * 0.35 + 0.05, ya + Ra * 0.4, 0.04], [0.02, ya + Ra * 0.62, 0.04]], 0.004, 6, 0.02)\n      } else {\n        const stemTop = y0 + yoke + 0.04 + open * D * 0.6\n        k.cyl('stainless', Math.max(0.006, D * 0.05), stemTop - y0, [0, (stemTop + y0) / 2, 0], 'y', 10)\n        k.handwheel('handwheel', Math.max(0.16, handwheelDia(kind, nps, rating)), [0, y0 + yoke + 0.04, 0], 'y', 4)\n      }\n    }\n    k.box('stainless', [D * 0.45, D * 0.2, 0.002], [0, -D * 0.2, D * 0.63])\n  })\n  return valveSpan(kind, nps, rating)\n}\n\n/** Electric multi-turn actuator on a gearbox (valve-local frame, stem +Y from `y`). */\nfunction movActuator(k: Kit, y: number, D: number, body: MatKey) {\n  const s = THREE.MathUtils.clamp(D * 1.8, 0.45, 1.2)\n  k.cyl(body, D * 0.36, 0.06 * s, [0, y + 0.03 * s, 0], 'y', 20)\n  k.rbox(body, [0.24 * s, 0.2 * s, 0.26 * s], 0.02 * s, [0, y + 0.16 * s, 0])\n  k.rbox('actuatorBlue', [0.2 * s, 0.26 * s, 0.22 * s], 0.025 * s, [0, y + 0.39 * s, 0])\n  k.cyl('actuatorBlue', 0.08 * s, 0.28 * s, [0, y + 0.37 * s, 0.24 * s], 'z', 20)\n  k.cyl('actuatorBlue', 0.085 * s, 0.03 * s, [0, y + 0.37 * s, 0.38 * s], 'z', 20)\n  k.rbox('actuatorBlue', [0.16 * s, 0.1 * s, 0.14 * s], 0.015 * s, [0, y + 0.57 * s, 0])\n  k.disc('glass', 0.035 * s, [0, y + 0.39 * s, 0.111 * s], 'z', 18)\n  k.handwheel('handwheel', 0.3 * s, [-0.16 * s, y + 0.39 * s, 0], '-x', 4)\n  for (const dx of [-0.05, 0.05]) k.cyl('brass', 0.012 * s, 0.04 * s, [dx * s, y + 0.25 * s, -0.12 * s], 'z', 8)\n}\n\n/** Small-bore instrument / tubing valve (needle or ball) on a line along `dir`, handle towards `up`. Body length ≈ 8 r. */\nexport function smallValve(k: Kit, kind: 'needle' | 'ball', pos: V3, dir: V3, r: number, up: V3 = [0, 1, 0], mat: MatKey = 'stainless') {\n  const b = Math.max(0.012, r * 2.2)\n  k.with(frame(pos, dir, up), () => {\n    k.box(mat, [b * 2.6, b * 1.4, b * 1.4], [0, 0, 0])\n    for (const s of [-1, 1]) k.hex(mat, b * 1.25, b * 0.8, [s * b * 1.6, 0, 0], 'x')\n    if (kind === 'needle') {\n      k.cyl(mat, b * 0.45, b * 1.6, [0, b * 1.4, 0], 'y', 10)\n      k.hex(mat, b * 1.1, b * 0.5, [0, b * 1.1, 0], 'y')\n      k.box('handwheel', [b * 2.2, b * 0.35, b * 0.4], [0, b * 2.25, 0])\n    } else {\n      k.cyl(mat, b * 0.35, b * 0.8, [0, b * 1.0, 0], 'y', 10)\n      k.box('actuatorRed', [b * 4, b * 0.25, b * 0.6], [b * 1.6, b * 1.45, 0])\n    }\n  })\n}\n\n/** Small conventional relief valve: inlet at `inlet` going up (+Y), outlet towards `out`. Returns the outlet connection point. */\nexport function smallPsv(k: Kit, inlet: V3, out: V3, size = 0.025, body: MatKey = 'stainless', bonnet: MatKey = 'actuatorRed') {\n  const s = size\n  const o = V(out).normalize()\n  const c = addv(inlet, [0, 1, 0], s * 2.2)\n  k.hex(body, s * 1.6, s * 0.9, addv(inlet, [0, 1, 0], s * 0.45))\n  k.cyl(body, s * 1.0, s * 2.4, addv(c, [0, -1, 0], s * 0.3), 'y', 16)\n  k.sphere(body, s * 1.15, c, undefined, 14)\n  const oc = addv(c, arr(o), s * 1.4)\n  k.rod(body, c, oc, s * 0.7, 12)\n  k.hex(body, s * 1.6, s * 0.9, addv(c, arr(o), s * 1.9), arr(o))\n  k.cyl(bonnet, s * 0.75, s * 3.2, addv(c, [0, 1, 0], s * 2.4), 'y', 14, s * 0.55)\n  k.cyl(bonnet, s * 0.6, s * 0.9, addv(c, [0, 1, 0], s * 4.4), 'y', 12, s * 0.4)\n  k.box('nut', [s * 2.2, s * 0.2, s * 0.35], addv(c, [0, 1, 0], s * 4.2))\n  k.box('stainless', [s * 0.03 + 0.012, s * 1.2, 0.0015], addv(addv(c, [0, 1, 0], s * 2.4), [0, 0, 1], s * 0.8))\n  return addv(c, arr(o), s * 2.35)\n}\n\n/** Pressure transmitter (coplanar, 2-valve manifold) on an impulse stub from `tap` along `n`; dual-compartment head with LCD. */\nexport function transmitter(k: Kit, tap: V3, n: V3, standoff = 0.1, housing: MatKey = 'actuatorBlue') {\n  const d = V(n).normalize()\n  const m = addv(tap, arr(d), standoff)\n  k.rod('tubing', tap, m, 0.007, 8)\n  k.with(frame(m, arr(d)), () => {\n    k.box('stainless', [0.05, 0.05, 0.07], [0.025, 0, 0])\n    for (const s of [-1, 1]) k.cyl('handwheel', 0.006, 0.04, [0.025, 0, s * 0.055], 'z', 6)\n    k.box('stainless', [0.03, 0.06, 0.06], [0.065, 0.01, 0])\n    k.cyl('stainless', 0.03, 0.07, [0.07, 0.075, 0], 'y', 16)\n    k.cyl(housing, 0.042, 0.1, [0.07, 0.15, 0], 'x', 20)\n    for (const s of [-1, 1]) k.cyl(housing, 0.046, 0.022, [0.07 + s * 0.06, 0.15, 0], 'x', 20)\n    k.disc(lcdMaterial(), 0.03, [0.132, 0.15, 0], 'x', 20)\n    k.disc('glass', 0.034, [0.133, 0.15, 0], 'x', 20)\n    k.cyl('brass', 0.011, 0.03, [0.07, 0.15, 0.055], 'z', 8)\n  })\n}\n\n/** Thermowell with transmitter head, inserted at `at` on a pipe, head out along `n`. */\nexport function tempElement(k: Kit, at: V3, n: V3, od: number) {\n  const d = V(n).normalize()\n  const base = addv(at, arr(d), od / 2)\n  k.with(frame(base, arr(d)), () => {\n    k.cyl('stainless', 0.02, 0.04, [0.02, 0, 0], 'x', 12)\n    k.hex('stainless', 0.032, 0.02, [0.05, 0, 0], 'x')\n    k.cyl('stainless', 0.008, 0.06, [0.09, 0, 0], 'x', 8)\n    k.cyl('aluminium', 0.04, 0.06, [0.15, 0, 0], 'x', 18)\n    k.cyl('aluminium', 0.043, 0.015, [0.185, 0, 0], 'x', 18)\n    k.cyl('brass', 0.009, 0.025, [0.15, -0.045, 0], 'y', 8)\n  })\n}\n\n/** Instrument tapping with root valve and pressure gauge, from `tap` along `n`. */\nexport function gaugeTap(k: Kit, tap: V3, n: V3, max = 100, d = 0.1, unit: 'bar' | '°C' = 'bar') {\n  const v = V(n).normalize()\n  const a = addv(tap, arr(v), 0.05)\n  k.rod('tubing', tap, addv(tap, arr(v), 0.12), 0.007, 8)\n  smallValve(k, 'needle', a, arr(v), 0.006, Math.abs(v.y) > 0.9 ? [0, 0, 1] : [0, 1, 0])\n  const g = addv(tap, arr(v), 0.12 + d * 0.16)\n  const face: V3 = Math.abs(v.y) > 0.9 ? [0, 0, 1] : arr(v)\n  if (Math.abs(v.y) > 0.9) {\n    k.rod('tubing', addv(tap, arr(v), 0.12), addv(addv(tap, arr(v), 0.12), [0, 0, 1], 0.001), 0.007, 8)\n    gauge(k, addv(tap, arr(v), 0.12 + d / 2), face, d, unit, max)\n  } else gauge(k, g, face, d, unit, max)\n}\n\n/** Ladder cable tray along a polyline. Horizontal runs lie flat; vertical runs use `side` (horizontal) as the width direction. */\nexport function cableTray(k: Kit, pts: V3[], side: V3, w = 0.15, cables = 3) {\n  const sv = V(side).normalize()\n  const UP = new THREE.Vector3(0, 1, 0)\n  const sideOf = (d: THREE.Vector3) => (Math.abs(d.y) > 0.9 ? sv.clone() : new THREE.Vector3().crossVectors(UP, d).normalize())\n  const segs: { a: THREE.Vector3; d: THREE.Vector3; L: number; s: THREE.Vector3; n: THREE.Vector3 }[] = []\n  for (let i = 0; i < pts.length - 1; i++) {\n    const a = V(pts[i])\n    const d = V(pts[i + 1]).sub(a)\n    const L = d.length()\n    if (L < 1e-4) continue\n    d.normalize()\n    const s = sideOf(d)\n    let n = new THREE.Vector3().crossVectors(s, d).normalize()\n    if (Math.abs(d.y) < 0.9 && n.y < 0) n = n.negate()\n    segs.push({ a, d, L, s, n })\n  }\n  for (const { a, d, L, s, n } of segs) {\n    const q = new THREE.Quaternion().setFromRotationMatrix(new THREE.Matrix4().makeBasis(d, n, new THREE.Vector3().crossVectors(d, n)))\n    const mid = a.clone().addScaledVector(d, L / 2)\n    for (const sg of [-1, 1]) k.box('cableTray', [L + 0.01, 0.05, 0.003], arr(mid.clone().addScaledVector(s, (sg * w) / 2).addScaledVector(n, 0.02)), q)\n    const nr = Math.max(1, Math.floor(L / 0.25))\n    for (let j = 0; j <= nr; j++) k.box('cableTray', [0.02, 0.006, w], arr(a.clone().addScaledVector(d, (j / nr) * L).addScaledVector(n, 0.003)), q)\n  }\n  for (let c = 0; c < cables; c++) {\n    const off = ((c + 0.5) / cables - 0.5) * w * 0.7\n    const P: V3[] = []\n    segs.forEach(({ a, d, L, s, n }, i) => {\n      if (i === 0) P.push(arr(a.clone().addScaledVector(s, off).addScaledVector(n, 0.014)))\n      P.push(arr(a.clone().addScaledVector(d, L).addScaledVector(s, off).addScaledVector(n, 0.014)))\n    })\n    k.tube('cable', P, 0.008, 6, 0.08)\n  }\n}\n\n/**\n * Local control panel on two posts, door facing `n` (±X or ±Z), standing on the deck at `base`.\n * Returns the cable-gland point under the enclosure (for a tray run).\n */\nexport function localPanel(k: Kit, base: V3, n: V3, opts: { w?: number; h?: number; top?: number; title?: string; screen?: boolean; buttons?: number } = {}) {\n  const w = opts.w ?? 0.6\n  const h = opts.h ?? 0.7\n  const top = opts.top ?? 1.75\n  const dep = 0.25\n  const nn = V(n).normalize()\n  const side = new THREE.Vector3(0, 1, 0).cross(nn).normalize()\n  const q = new THREE.Quaternion().setFromUnitVectors(new THREE.Vector3(0, 0, 1), nn)\n  const at = (x: number, y: number, z: number) => arr(V(base).addScaledVector(side, x).add(new THREE.Vector3(0, y, 0)).addScaledVector(nn, z))\n  for (const s of [-1, 1]) {\n    member(k, at(s * (w / 2 - 0.05), 0, -0.05), at(s * (w / 2 - 0.05), top + 0.15, -0.05), 'UPN 80', 'galvanised', arr(nn))\n    k.box('galvanised', [0.16, 0.012, 0.16], at(s * (w / 2 - 0.05), 0.006, -0.05), q)\n  }\n  for (const y of [0.35, top - h - 0.05]) member(k, at(-w / 2, y, -0.03), at(w / 2, y, -0.03), 'L50x50x5', 'galvanised', [0, 1, 0])\n  const yc = top - h / 2\n  k.rbox('stainless', [w, h, dep], 0.015, at(0, yc, dep / 2), q)\n  k.rbox('stainless', [w - 0.03, h - 0.03, 0.012], 0.006, at(0, yc, dep + 0.006), q)\n  for (const s of [-0.3, 0.3]) k.box('nut', [0.02, 0.06, 0.012], at(w / 2 - 0.04, yc + s * h, dep + 0.016), q)\n  k.box('stainless', [w + 0.12, 0.01, dep + 0.2], at(0, top + 0.1, dep / 2 + 0.03), new THREE.Quaternion().setFromUnitVectors(new THREE.Vector3(0, 0, 1), nn).multiply(new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(1, 0, 0), 0.12)))\n  const fz = dep + 0.013\n  if (opts.screen !== false) {\n    k.box('rubberBlack', [w * 0.5, h * 0.3, 0.006], at(0, yc + h * 0.18, fz), q)\n    k.plane(lcdMaterial(), w * 0.45, h * 0.26, at(0, yc + h * 0.18, fz + 0.0035), q)\n  }\n  const nb = opts.buttons ?? 3\n  const mats: MatKey[] = ['safetyGreen', 'actuatorRed', 'actuatorYellow', 'lampLens', 'safetyGreen', 'actuatorRed']\n  for (let i = 0; i < nb; i++) k.cyl(mats[i % mats.length], 0.016, 0.02, at(-w * 0.3 + (i * w * 0.6) / Math.max(1, nb - 1), yc - h * 0.18, fz + 0.01), arr(nn), 14)\n  k.cyl('actuatorYellow', 0.04, 0.004, at(w * 0.3, yc - h * 0.36, fz), arr(nn), 20)\n  k.dome('actuatorRed', 0.025, at(w * 0.3, yc - h * 0.36, fz + 0.01), arr(nn), Math.PI / 2, 0.7, 16)\n  if (opts.title) k.plane(textMaterial(opts.title, '#f2f2ee', '#111', 512, 96), w * 0.7, w * 0.13, at(0, yc + h * 0.42, fz + 0.001), q)\n  for (let i = 0; i < 4; i++) k.cyl('brass', 0.012, 0.035, at(-w * 0.3 + i * w * 0.2, top - h - 0.015, dep / 2), 'y', 8)\n  return at(0, top - h - 0.04, dep / 2)\n}\n\n/** Pipe stanchion from the deck to under a pipe centred at `at`, with saddle plate and U-bolt. Pipe runs along `along`. */\nexport function pipeSupport(k: Kit, at: V3, od: number, deckY: number, along: 'x' | 'z', mat: MatKey = 'galvanised') {\n  const top = at[1] - od / 2 - 0.006\n  if (top - deckY < 0.05) return\n  const big = od > 0.12\n  const sec = big ? 'HEB 100' : 'L50x50x5'\n  member(k, [at[0], deckY, at[2]], [at[0], top - 0.01, at[2]], sec, mat, along === 'x' ? [1, 0, 0] : [0, 0, 1])\n  const w = Math.max(0.1, od + 0.06)\n  k.box(mat, along === 'x' ? [0.1, 0.012, w] : [w, 0.012, 0.1], [at[0], top - 0.004, at[2]])\n  k.box(mat, [0.16, 0.012, 0.16], [at[0], deckY + 0.006, at[2]])\n  k.torus('boltXylan', od / 2 + 0.006, Math.max(0.004, od * 0.03), [at[0], at[1], at[2]], along === 'x' ? 'x' : 'z', 6, 20, Math.PI)\n  for (const s of [-1, 1]) {\n    const p: V3 = along === 'x' ? [at[0], top + 0.004, at[2] + s * (od / 2 + 0.006)] : [at[0] + s * (od / 2 + 0.006), top + 0.004, at[2]]\n    k.hex('nut', Math.max(0.014, od * 0.12), 0.01, p)\n  }\n}\n\nexport interface VesselDims {\n  Ro: number\n  hd: number\n  /** bottom of the lower head */\n  yBot: number\n  /** top of the upper head */\n  yTop: number\n}\n\n/** Vertical 2:1 ellipsoidal-head vessel, bottom tangent line at `yTL`, with girth seams. */\nexport function vVessel(k: Kit, x: number, z: number, yTL: number, id: number, tt: number, wall: number, mat: MatKey = 'equipmentPaint', seg = 48): VesselDims {\n  const Ro = id / 2 + wall\n  const hd = headDepth('2:1-ellipsoidal', id) + wall\n  const prof: [number, number][] = [[0, -hd]]\n  for (let i = 1; i <= 12; i++) {\n    const t = (i / 12) * (Math.PI / 2)\n    prof.push([Ro * Math.sin(t), -hd * Math.cos(t)])\n  }\n  for (let i = 0; i <= 12; i++) {\n    const t = (i / 12) * (Math.PI / 2)\n    prof.push([Ro * Math.cos(t), tt + hd * Math.sin(t)])\n  }\n  k.lathe(mat, prof, [x, yTL, z], 'y', seg)\n  for (const y of [0, tt]) k.torus(mat, Ro + 0.0008, Math.max(0.003, Ro * 0.008), [x, yTL + y, z], 'y', 6, seg)\n  return { Ro, hd, yBot: yTL - hd, yTop: yTL + tt + hd }\n}\n\n/** Angle or pipe legs welded to a vertical shell, with base plates and anchor nuts. */\nexport function vesselLegs(k: Kit, x: number, z: number, Ro: number, yAttach: number, deckY: number, n = 4, mat: MatKey = 'equipmentPaint', phase = Math.PI / 4) {\n  const lr = Math.max(0.03, Ro * 0.12)\n  for (let i = 0; i < n; i++) {\n    const a = phase + (i / n) * Math.PI * 2\n    const px = x + Math.cos(a) * (Ro + lr * 0.6)\n    const pz = z + Math.sin(a) * (Ro + lr * 0.6)\n    k.cyl(mat, lr, yAttach - deckY, [px, (yAttach + deckY) / 2, pz], 'y', 12)\n    k.box(mat, [0.01, Math.min(0.3, (yAttach - deckY) * 0.3), lr * 2.4], [x + Math.cos(a) * (Ro + 0.005), yAttach - 0.1, z + Math.sin(a) * (Ro + 0.005)], new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 1, 0), -a))\n    const bp = lr * 3.2\n    k.box(mat, [bp, 0.014, bp], [px, deckY + 0.007, pz])\n    for (const s of [-1, 1]) k.hex('nut', 0.026, 0.016, [px + s * bp * 0.32, deckY + 0.022, pz + s * bp * 0.32])\n  }\n}\n\n/** Bunded drip tray: floor plate, upstand rim and a drain coupling on the -X end. */\nexport function dripPan(k: Kit, cx: number, cz: number, sx: number, sz: number, y: number, rim = 0.06, mat: MatKey = 'stainless') {\n  k.box(mat, [sx, 0.005, sz], [cx, y + 0.0025, cz])\n  for (const s of [-1, 1]) {\n    k.box(mat, [sx, rim, 0.004], [cx, y + rim / 2, cz + s * (sz / 2 - 0.002)])\n    k.box(mat, [0.004, rim, sz], [cx + s * (sx / 2 - 0.002), y + rim / 2, cz])\n  }\n  k.cyl(mat, 0.016, 0.06, [cx - sx / 2 - 0.02, y + 0.02, cz], 'x', 10)\n  k.hex('nut', 0.03, 0.02, [cx - sx / 2 - 0.05, y + 0.02, cz], 'x')\n}\n\n/** Brass earth boss on a steel face. */\nexport function earthBoss(k: Kit, pos: V3, n: V3) {\n  k.cyl('brass', 0.014, 0.025, pos, n, 10)\n  k.hex('brass', 0.024, 0.008, addv(pos, n, 0.012), n)\n}\n\n/** Flanged spool joint inside the skid piping (both flanges, gasket, studs), centred at `pos` along `dir`. */\nexport function spoolJoint(k: Kit, pos: V3, dir: V3, nps: number, rating: Rating) {\n  flangedJoint(k, nps, rating, pos, dir)\n  const f = flangeDims(nps, rating)\n  const L = f.hubLength + f.raisedFaceHeight\n  liner(k, nps, addv(pos, dir, -0.00225), dir, L)\n  liner(k, nps, addv(pos, dir, 0.00225), [-dir[0], -dir[1], -dir[2]], L)\n}\n\n/** Curved painted label band on a vertical shell (axis +Y at x, z), centred on the +Z side, `h` tall over `arc` radians. */\nexport function shellLabel(k: Kit, text: string, x: number, y: number, z: number, Ro: number, h: number, arc = 1.1, bg = '#1f5fa0', fg = '#ffffff') {\n  k.add(textMaterial(text, bg, fg, 512, Math.round((512 * h) / (Ro * arc))), new THREE.CylinderGeometry(Ro + 0.003, Ro + 0.003, h, 24, 1, true, -arc / 2, arc), new THREE.Matrix4().makeTranslation(x, y, z))\n}\n\n/** Open mouth where a branch meets a run or shell: dark bore disc on the surface at `at` facing `dir`, plus the fillet weld. */\nexport function branchMouth(k: Kit, at: V3, dir: V3, nps: number, wall = 0.006) {\n  const r = pipeOD(nps) / 2\n  k.disc('pipeBore', r - wall, addv(at, dir, 0.0012), dir, 24)\n  k.torus('flangeSteel', r + 0.001, Math.max(0.003, r * 0.06), addv(at, dir, 0.002), dir, 6, 24)\n}\n\n/** Bow shackles with screw pins through the four lib `skid()` padeyes (skid of length L, width W, deck top `deckY`). */\nexport function padeyeShackles(k: Kit, L: number, W: number, deckY: number) {\n  for (const sx of [-1, 1])\n    for (const sz of [-1, 1]) {\n      const x = sx * (L / 2 - 0.25)\n      const z = sz * (W / 2 - 0.03)\n      const hy = deckY + 0.078\n      k.rod('galvanised', [x, hy, z - 0.05], [x, hy, z + 0.05], 0.011, 10)\n      k.hex('nut', 0.03, 0.016, [x, hy, z - 0.055], 'z')\n      k.cyl('galvanised', 0.02, 0.012, [x, hy, z + 0.055], 'z', 12)\n      k.tube('actuatorRed', [[x, hy, z - 0.042], [x, hy + 0.11, z - 0.042], [x, hy + 0.11, z + 0.042], [x, hy, z + 0.042]], 0.011, 8, 0.04)\n    }\n}\n\n/** Basket strainer on a line along +X centred at `pos` (flanged ends are spool joints at ±len/2), with pot, cover, drain and DP gauge. */\nexport function basketStrainer(k: Kit, pos: V3, nps: number, rating: Rating, len: number, mat: MatKey = 'valveBody') {\n  const D = pipeOD(nps)\n  const f = flangeDims(nps, rating)\n  const fl = f.hubLength + f.raisedFaceHeight\n  const [x, y, z] = pos\n  for (const s of [-1, 1]) spoolJoint(k, [x + (s * len) / 2, y, z], [s, 0, 0], nps, rating)\n  const inner = len / 2 - fl\n  k.pipe(mat, [x - inner - 0.002, y, z], [x + inner + 0.002, y, z], D * 1.1, D * 0.05 + 0.004, 28)\n  const R = D * 0.85\n  k.cyl(mat, R, D * 1.9, [x, y + D * 0.15, z], 'y', 32)\n  k.dome(mat, R, [x, y - D * 0.8, z], '-y', Math.PI / 2, 0.6, 32)\n  const yc = y + D * 1.1\n  k.cyl(mat, R + 0.05, 0.05, [x, yc, z], 'y', 32)\n  k.cyl(mat, R + 0.05, 0.04, [x, yc + 0.045, z], 'y', 32)\n  k.around(12, R + 0.025, [x, yc + 0.07, z], 'y', (p) => k.hex('nut', 0.03, 0.02, p))\n  k.box('handwheel', [R * 1.2, 0.025, 0.03], [x, yc + 0.08, z])\n  k.cyl('stainless', 0.012, 0.08, [x, y - D * 0.8 - R * 0.6 - 0.03, z], 'y', 10)\n  k.hex('nut', 0.03, 0.02, [x, y - D * 0.8 - R * 0.6 - 0.08, z])\n  k.tube('tubing', [[x - R * 0.7, y + D * 0.3, z + R * 0.75], [x - R * 0.7, yc + 0.15, z + R + 0.08], [x + R * 0.7, yc + 0.15, z + R + 0.08], [x + R * 0.7, y + D * 0.3, z + R * 0.75]], 0.005, 6, 0.03)\n  gauge(k, [x, yc + 0.2, z + R + 0.1], 'z', 0.1, 'bar', 2)\n}\n\n/** Spring-loaded back-pressure / thermal relief valve body on a line point, bonnet towards `up`. */\nexport function reliefBody(k: Kit, pos: V3, up: V3, s = 0.02) {\n  k.sphere('valveBody', s * 1.2, pos, undefined, 14)\n  k.cyl('actuatorRed', s * 0.7, s * 3, addv(pos, up, s * 2.4), up, 12, s * 0.5)\n  k.cyl('actuatorRed', s * 0.5, s * 0.8, addv(pos, up, s * 4.2), up, 10)\n}\n\n/**\n * Mating pipe flange bolted to a nozzle face that points along `dir` (nozzle drawn with studs: false): gasket, flange\n * facing back, bore liner and through-studs with two nuts. Returns the weld end of the mating flange.\n */\nexport function mateFlange(k: Kit, face: V3, dir: V3, nps: number, rating: Rating): V3 {\n  const f = flangeDims(nps, rating)\n  const g = 0.0045\n  gasket(k, nps, rating, addv(face, dir, g / 2), dir, g)\n  const mf = addv(face, dir, g)\n  const back: V3 = [-dir[0], -dir[1], -dir[2]]\n  blFlange(k, mf, back, nps, rating, false)\n  const span = 2 * (f.thickness + f.raisedFaceHeight) + g\n  const studL = span + f.boltDia * 3\n  k.boltCircle('boltXylan', 'nut', f.bolts, f.boltCircle / 2, addv(addv(face, dir, g / 2), dir, -studL / 2), dir, f.boltDia, studL, [f.boltDia * 0.95, studL - f.boltDia * 0.95])\n  return addv(mf, dir, f.hubLength + f.raisedFaceHeight)\n}\n\n/** Weld-to-weld length of an in-kit wafer butterfly valve between two weld-neck flanges. */\nexport function butterflySpan(nps: number, rating: Rating) {\n  const f = flangeDims(nps, rating)\n  return faceToFace('butterfly-wafer', nps, rating) + 2 * (0.003 + f.hubLength + f.raisedFaceHeight)\n}\n\n/** Wafer butterfly valve clamped between two pipe flanges, centred at `pos` on a line along `dir`; lever, gear or pneumatic rack-and-pinion actuator towards `up`. */\nexport function butterflyValve(k: Kit, pos: V3, dir: V3, nps: number, rating: Rating, up: V3 = [0, 1, 0], op: 'lever' | 'gear' | 'pneumatic' = 'pneumatic') {\n  const f = flangeDims(nps, rating)\n  const w = faceToFace('butterfly-wafer', nps, rating)\n  const D = pipeOD(nps)\n  const fl = f.hubLength + f.raisedFaceHeight\n  k.with(frame(pos, dir, up), () => {\n    for (const s of [-1, 1]) {\n      const face: V3 = [s * (w / 2 + 0.003), 0, 0]\n      flange(k, nps, rating, face, [-s, 0, 0], false)\n      liner(k, nps, face, [-s, 0, 0], fl)\n      gasket(k, nps, rating, [s * (w / 2 + 0.0015), 0, 0], 'x', 0.003)\n    }\n    const ri = D / 2 - 0.004\n    k.lathe('valveBody', [[ri, -w / 2], [f.raisedFace / 2 + 0.01, -w / 2], [f.raisedFace / 2 + 0.01, w / 2], [ri, w / 2]], [0, 0, 0], 'x', 32)\n    k.lathe('pipeBore', [[ri, w / 2], [ri, -w / 2]], [0, 0, 0], 'x', 24)\n    k.box('stainless', [0.006, 2 * ri, 2 * ri * 0.15], [0, 0, 0]) // disc edge-on (open)\n    const studL = w + 2 * (f.thickness + f.raisedFaceHeight) + f.boltDia * 3.2\n    k.boltCircle('boltXylan', 'nut', f.bolts, f.boltCircle / 2, [-studL / 2, 0, 0], 'x', f.boltDia, studL, [f.boltDia * 0.95, studL - f.boltDia * 0.95])\n    const yN = f.raisedFace / 2 + 0.01\n    k.cyl('valveBody', Math.max(0.018, D * 0.14), 0.09 + D * 0.2, [0, yN + (0.09 + D * 0.2) / 2, 0], 'y', 16)\n    const yT = yN + 0.09 + D * 0.2\n    k.box('valveBody', [0.1 + D * 0.3, 0.012, 0.1 + D * 0.3], [0, yT, 0])\n    if (op === 'pneumatic') {\n      const s = THREE.MathUtils.clamp(D * 2.2, 0.18, 0.6)\n      k.rbox('actuatorYellow', [s * 0.45, s * 0.4, s * 1.2], s * 0.06, [0, yT + s * 0.2 + 0.006, 0])\n      for (const sz of [-1, 1]) k.cyl('actuatorYellow', s * 0.22, s * 0.03, [0, yT + s * 0.2 + 0.006, sz * s * 0.6], 'z', 18)\n      k.rbox('aluminium', [s * 0.3, s * 0.2, s * 0.3], s * 0.03, [0, yT + s * 0.5, 0]) // limit switch box\n      k.cyl('actuatorRed', s * 0.08, s * 0.05, [0, yT + s * 0.62, 0], 'y', 12)\n    } else if (op === 'gear') {\n      const gb = Math.max(0.1, D * 0.6)\n      k.rbox('valveBody', [gb, gb * 0.6, gb * 0.8], gb * 0.08, [0, yT + gb * 0.3, 0])\n      k.handwheel('handwheel', Math.max(0.25, gb * 1.8), [0, yT + gb * 0.3, gb * 0.7], 'z', 5)\n    } else k.box('actuatorRed', [0.04, 0.02, Math.max(0.2, D * 1.6)], [0, yT + 0.02, Math.max(0.1, D * 0.8) - 0.03])\n  })\n  return w + 2 * (0.003 + fl)\n}\n"
    }
  ],
  "categories": [
    "packages"
  ],
  "meta": {
    "export": "NitrogenGenerator",
    "anchor": "base",
    "standards": [
      "ISO 8573-1",
      "ASME BPVC VIII-1",
      "ASME B16.5"
    ]
  }
}