{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "metering-skid",
  "type": "registry:component",
  "title": "Fiscal metering skid",
  "description": "Liquid or gas fiscal metering skid: inlet and outlet headers with blind-flanged ends, parallel meter runs (ultrasonic or turbine) each with an inlet block valve, basket strainer with DP gauge, plate flow conditioner, 10D / 5D straight lengths, P transmitter, duplicate TTs plus a test thermowell, thermal relief valve and a motor-operated DBB outlet valve with body bleed, plus a prover header with MOV diverters, prover return with check valve, sampler, densitometer loop, local JB and overhead cable tray. `runs` sets the run count and skid width.",
  "dependencies": [
    "three",
    "@react-three/fiber",
    "@react-three/drei"
  ],
  "registryDependencies": [
    "https://deck-twin-library.demoareeb.workers.dev/r/core.json"
  ],
  "files": [
    {
      "path": "packages/metering-skid.tsx",
      "type": "registry:file",
      "target": "components/deck-twin/packages/metering-skid.tsx",
      "content": "// Fiscal metering skid: inlet / outlet headers, parallel meter runs (ultrasonic or turbine) with flow conditioners and DBB valves, prover header. API MPMS 5 / 4, ISO 17089, AGA 9.\nimport * as THREE from 'three'\nimport { Kit, type MatKey, type V3 } from '../lib/kit'\nimport { KitMesh, useKit, type GroupProps } from '../lib/mesh'\nimport { blindFlange, pipe, pipeRun, skid, tagPlate } from '../lib/parts'\nimport { port, type Port } from '../lib/ports'\nimport { SECTIONS, flange as flangeDims, pipeOD, type Rating } from '../lib/standards'\nimport { textMaterial } from '../lib/textures'\nimport { addv, basketStrainer, blFlange, branchMouth, cableTray, padeyeShackles, reliefBody, smallValve, spoolJoint, earthBoss, gaugeTap, localPanel, pipeSupport, tempElement, transmitter, valve, valveSpan } from './_skid'\n\nexport interface MeteringSkidProps {\n  /** parallel meter runs (duty + standby) */\n  runs?: number\n  meterType?: 'ultrasonic' | 'turbine'\n  headerNps?: number\n  runNps?: number\n  rating?: Rating\n  tag?: string\n}\n\nexport const defaults = {\n  runs: 3,\n  meterType: 'ultrasonic' as 'ultrasonic' | 'turbine',\n  headerNps: 10,\n  runNps: 6,\n  rating: 600 as Rating,\n  tag: 'X-R150',\n}\n\ntype P = typeof defaults\n\nconst SKID = 'HEB 220'\nconst BODY: MatKey = 'equipmentPaint'\n\nfunction layout(p: P) {\n  const N = Math.max(1, Math.min(6, Math.round(p.runs)))\n  const D = pipeOD(p.runNps)\n  const Dh = pipeOD(p.headerNps)\n  const fr = flangeDims(p.runNps, p.rating)\n  const Sb = valveSpan('ball', p.runNps, p.rating)\n  const Lm = p.meterType === 'ultrasonic' ? Math.max(0.45, 3 * D) : Math.max(0.3, 2 * D)\n  const jf = fr.hubLength + fr.raisedFaceHeight + 0.00225 // joint centre to weld end\n  // run stations measured from the inlet header centreline (x = 0)\n  const s: Record<string, number> = {}\n  let x = Dh / 2 + 0.35\n  s.iv = x + Sb / 2\n  x += Sb\n  const Ls = Math.max(0.45, 3.2 * D)\n  s.stc = x + 0.12 + jf + Ls / 2\n  x = s.stc + Ls / 2 + jf + 0.12\n  s.fc = x + jf\n  x = s.fc + jf\n  s.m0 = x + 10 * D\n  s.m1 = s.m0 + Lm\n  s.tw = s.m1 + 3 * D\n  s.tee = s.m1 + 5 * D + 0.1\n  s.ov = s.tee + 0.45 + Sb / 2\n  s.out = s.ov + Sb / 2 + 0.35 + Dh / 2\n  const edge = 0.95\n  const L = s.out + 2 * edge\n  const xIn = -L / 2 + edge\n  const st = Object.fromEntries(Object.entries(s).map(([k, v]) => [k, xIn + v])) as Record<string, number>\n  const sp = Math.max(1.05, fr.od + 0.7)\n  // lanes from the back (-Z): inlet / outlet / prover lane, runs, prover return, header ends; then centred on the footprint\n  const z0 = 0.05\n  const zRun = Array.from({ length: N }, (_, i) => (i - (N - 1) / 2) * sp + z0)\n  const zLane = zRun[0] - 0.75\n  const zCap = zRun[N - 1] + 0.65\n  const zRet = zRun[N - 1] + 0.4\n  const W = zCap - zLane + 1.3\n  const y0 = SECTIONS[SKID].d + 0.008\n  const yp = y0 + 0.32\n  const yr = yp + Sb + 0.35\n  return { N, D, Dh, Lm, Ls, Sb, jf, L, W, xIn, xOut: st.out, st, zRun, zLane, zCap, zRet, y0, yp, yr }\n}\n\nexport function ports(props: MeteringSkidProps = {}): Port[] {\n  const p = { ...defaults, ...props } as P\n  const g = layout(p)\n  return [\n    port('inlet', 'Inlet', [-g.L / 2 - 0.05, g.yr, g.zLane], [-1, 0, 0], p.headerNps, p.rating),\n    port('outlet', 'Outlet', [g.L / 2 + 0.05, g.yr, g.zLane], [1, 0, 0], p.headerNps, p.rating),\n    port('prover-out', 'To prover', [g.L / 2 + 0.05, g.yp, g.zLane], [1, 0, 0], p.runNps, p.rating),\n    port('prover-return', 'From prover', [g.L / 2 + 0.05, g.yp, g.zRet], [1, 0, 0], p.runNps, p.rating),\n  ]\n}\n\nexport function MeteringSkid(props: MeteringSkidProps & GroupProps) {\n  const { runs, meterType, headerNps, runNps, rating, tag, ...group } = { ...defaults, ...props }\n  const p = { runs, meterType, headerNps, runNps, rating, tag } as P\n  const data = useKit((k) => build(k, p), [runs, meterType, headerNps, runNps, rating, tag])\n  return (\n    <group {...group}>\n      <KitMesh data={data} />\n    </group>\n  )\n}\n\nexport default MeteringSkid\n\nfunction build(k: Kit, p: P) {\n  const g = layout(p)\n  const { L, W, y0, yr, yp, D, Dh, st, zRun, zLane, zCap, zRet, xIn, xOut } = g\n  const R = p.rating\n  skid(k, L, W, SKID)\n  padeyeShackles(k, L, W, y0)\n  tagPlate(k, p.tag, [-L / 2 + 1.2, SECTIONS[SKID].d * 0.5, W / 2 + 0.002], 'z', 0.35)\n  earthBoss(k, [L / 2 - 0.6, SECTIONS[SKID].d * 0.5, W / 2], [0, 0, 1])\n  const fh = flangeDims(p.headerNps, R)\n  const fr = flangeDims(p.runNps, R)\n  const wh = fh.hubLength + fh.raisedFaceHeight\n  const wr = fr.hubLength + fr.raisedFaceHeight\n\n  // inlet: BL flange → elbow → header along +Z, blind-flanged end with drain\n  const inW = blFlange(k, [-L / 2 - 0.05, yr, zLane], [-1, 0, 0], p.headerNps, R)\n  pipeRun(k, [inW, [xIn, yr, zLane], [xIn, yr, zCap - wh]], p.headerNps)\n  blindFlange(k, p.headerNps, R, flangeEnd(k, [xIn, yr, zCap - wh], [0, 0, 1], p.headerNps, R), [0, 0, 1])\n  transmitter(k, [xIn - Dh / 2, yr + 0.05, zLane + 0.6], [-1, 0, 0], 0.12)\n  tempElement(k, [xIn, yr, zLane + 0.95], [-1, 0, 0], Dh)\n  gaugeTap(k, [xIn, yr + Dh / 2, zLane + 0.35], [0, 1, 0], 160, 0.1)\n  // outlet header → elbow → BL flange\n  const outW = blFlange(k, [L / 2 + 0.05, yr, zLane], [1, 0, 0], p.headerNps, R)\n  pipeRun(k, [outW, [xOut, yr, zLane], [xOut, yr, zCap - wh]], p.headerNps)\n  blindFlange(k, p.headerNps, R, flangeEnd(k, [xOut, yr, zCap - wh], [0, 0, 1], p.headerNps, R), [0, 0, 1])\n  // sampler probe and densitometer loop on the outlet header\n  k.cyl('stainless', 0.03, 0.25, [xOut, yr + Dh / 2 + 0.1, zLane + 0.55], 'y', 14)\n  k.rbox('actuatorBlue', [0.2, 0.18, 0.16], 0.02, [xOut, yr + Dh / 2 + 0.3, zLane + 0.55])\n  k.tube('tubing', [[xOut - Dh / 2, yr, zLane + 0.3], [xOut - Dh / 2 - 0.25, yr, zLane + 0.3], [xOut - Dh / 2 - 0.25, yr - 0.45, zLane + 0.3], [xOut - Dh / 2 - 0.25, yr - 0.45, zLane + 0.2]], 0.017, 10, 0.05)\n  k.cyl('stainless', 0.06, 0.32, [xOut - Dh / 2 - 0.25, yr - 0.3, zLane + 0.3], 'y', 18)\n  transmitter(k, [xOut + Dh / 2, yr + 0.05, zLane + 0.6], [1, 0, 0], 0.12)\n\n  // prover header (under the runs): blind end at +Z, elbow at the lane, out to the BL\n  const xT = st.tee\n  const pW = blFlange(k, [L / 2 + 0.05, yp, zLane], [1, 0, 0], p.runNps, R)\n  pipeRun(k, [pW, [xT, yp, zLane], [xT, yp, zCap - 0.1 - wr]], p.runNps)\n  blindFlange(k, p.runNps, R, flangeEnd(k, [xT, yp, zCap - 0.1 - wr], [0, 0, 1], p.runNps, R), [0, 0, 1])\n  // prover return into the outlet header from below (check + block valve)\n  const rW = blFlange(k, [L / 2 + 0.05, yp, zRet], [1, 0, 0], p.runNps, R)\n  const Sc = valveSpan('check', p.runNps, R)\n  const xc = (xOut + L / 2) / 2 + 0.05\n  pipe(k, rW, [xc + Sc / 2, yp, zRet], p.runNps)\n  valve(k, 'check', [xc, yp, zRet], [-1, 0, 0], p.runNps, R)\n  pipeRun(k, [[xc - Sc / 2, yp, zRet], [xOut, yp, zRet], [xOut, yr - Dh / 2 + 0.004, zRet]], p.runNps)\n  branchMouth(k, [xOut, yr - Dh / 2 + 0.0035, zRet], [0, -1, 0], p.runNps)\n\n  for (const [i, z] of zRun.entries()) {\n    // branch off the inlet header, inlet block valve, flow conditioner\n    pipe(k, [xIn + Dh / 2 - 0.004, yr, z], [st.iv - g.Sb / 2, yr, z], p.runNps)\n    branchMouth(k, [xIn + Dh / 2 - 0.0035, yr, z], [1, 0, 0], p.runNps)\n    valve(k, 'ball', [st.iv, yr, z], [1, 0, 0], p.runNps, R)\n    pipe(k, [st.iv + g.Sb / 2, yr, z], [st.stc - g.Ls / 2 - g.jf, yr, z], p.runNps)\n    basketStrainer(k, [st.stc, yr, z], p.runNps, R, g.Ls)\n    pipe(k, [st.stc + g.Ls / 2 + g.jf, yr, z], [st.fc - g.jf, yr, z], p.runNps)\n    spoolJoint(k, [st.fc, yr, z], [1, 0, 0], p.runNps, R)\n    k.cyl('stainless', fr.raisedFace / 2 + 0.004, 0.012, [st.fc, yr, z], 'x', 28)\n    k.box('stainless', [0.012, fr.od / 2 + 0.06, 0.07], [st.fc, yr + fr.od / 2 + 0.01, z])\n    k.box(textMaterial('FC', '#d9dde0', '#111', 128, 128), [0.013, 0.05, 0.05], [st.fc, yr + fr.od / 2 + 0.05, z])\n    // upstream straight, meter, downstream straight\n    pipe(k, [st.fc + g.jf, yr, z], [st.m0 - g.jf, yr, z], p.runNps)\n    spoolJoint(k, [st.m0, yr, z], [1, 0, 0], p.runNps, R)\n    spoolJoint(k, [st.m1, yr, z], [1, 0, 0], p.runNps, R)\n    meter(k, p, [(st.m0 + st.m1) / 2, yr, z], g.Lm - 2 * (wr + 0.00225), D)\n    pipe(k, [st.m1 + g.jf, yr, z], [st.ov - g.Sb / 2, yr, z], p.runNps)\n    tempElement(k, [st.tw, yr, z], [0, 1, 0], D)\n    tempElement(k, [st.tw + 0.3, yr, z], [0, 1, 0], D)\n    tempElement(k, [st.tw + 0.6, yr, z], [0, 0, 1], D) // test thermowell\n    const xTrv = st.fc + (st.m0 - st.fc) * 0.3\n    k.rod('stainless', [xTrv, yr + D / 2 - 0.005, z], [xTrv, yr + D / 2 + 0.08, z], 0.012, 10)\n    reliefBody(k, [xTrv, yr + D / 2 + 0.1, z], [0, 1, 0], 0.018) // thermal relief\n    smallValve(k, 'needle', [st.ov, yr - D * 0.95, z], [0, -1, 0], 0.008, [0, 0, 1]) // DBB body bleed\n    transmitter(k, [st.m1 + D * 1.2, yr, z + D / 2], [0, 0, 1], 0.1)\n    // prover tee (down) and outlet MOV into the outlet header\n    const Sb = g.Sb\n    k.cyl('pipePaint', D / 2 + 0.006, D * 1.6, [st.tee, yr, z], 'x', 28, undefined, true)\n    branchMouth(k, [st.tee, yr - D / 2, z], [0, -1, 0], p.runNps)\n    valve(k, 'ball', [st.ov, yr, z], [1, 0, 0], p.runNps, R, [0, 1, 0], 'valveBody', 1, 'mov')\n    pipe(k, [st.ov + Sb / 2, yr, z], [xOut - Dh / 2 + 0.004, yr, z], p.runNps)\n    branchMouth(k, [xOut - Dh / 2 + 0.0035, yr, z], [-1, 0, 0], p.runNps)\n    const yv = (yr + yp) / 2\n    pipe(k, [st.tee, yr - D / 2 + 0.004, z], [st.tee, yv + Sb / 2, z], p.runNps)\n    valve(k, 'ball', [st.tee, yv, z], [0, -1, 0], p.runNps, R, [0, 0, 1], 'valveBody', 0, 'mov')\n    pipe(k, [st.tee, yv - Sb / 2, z], [st.tee, yp + D / 2 - 0.004, z], p.runNps)\n    branchMouth(k, [st.tee, yp + D / 2 - 0.0035, z], [0, 1, 0], p.runNps)\n    // supports\n    for (const x of [st.fc + (st.m0 - st.fc) * 0.5, st.m1 + 2.5 * D]) pipeSupport(k, [x, yr, z], D, y0, 'x')\n    k.plane(textMaterial(`RUN ${i + 1}`, '#1b4f8a', '#ffffff', 256, 96), 0.22, 0.08, [st.iv - g.Sb / 2 - 0.15, yr + D / 2 + 0.07, z + 0.001])\n  }\n  for (const z of [zLane + 0.6, zCap - 0.4]) {\n    pipeSupport(k, [xIn, yr, z], Dh, y0, 'z')\n    pipeSupport(k, [xOut, yr, z], Dh, y0, 'z')\n  }\n  pipeSupport(k, [xT, yp, (zLane + zRun[0]) / 2], D, y0, 'z')\n  pipeSupport(k, [xT, yp, zCap - 0.35], D, y0, 'z')\n\n  // instrument cable tray: front riser, overhead run across the meters, local panel at the front\n  const xTr = st.m1 + 0.45\n  const yTr = yr + 0.95\n  const zF = W / 2 - 0.25\n  const zB = zRun[0] - 0.55\n  for (const z of [zF, zB]) {\n    k.box('galvanised', [0.08, yTr - y0, 0.08], [xTr, (yTr + y0) / 2 - 0.03, z])\n    k.box('galvanised', [0.18, 0.012, 0.18], [xTr, y0 + 0.006, z])\n    k.box('galvanised', [0.08, 0.05, 0.3], [xTr, yTr - 0.06, z])\n  }\n  cableTray(k, [[xTr, yTr - 0.035, zB], [xTr, yTr - 0.035, zF]], [1, 0, 0], 0.2, 3)\n  const xP = xIn + 1.1\n  const gl = localPanel(k, [xP, y0, W / 2 - 0.45], [0, 0, 1], { w: 0.7, h: 0.8, top: 1.9, title: 'METERING JB', buttons: 2 })\n  cableTray(k, [[xP, gl[1] - 0.04, gl[2]], [xP, y0 + 0.25, gl[2]], [xP, y0 + 0.25, zF], [xTr - 0.1, y0 + 0.25, zF], [xTr - 0.1, yTr - 0.1, zF]], [1, 0, 0], 0.2, 3)\n  for (const z of zRun) {\n    const top = p.meterType === 'ultrasonic' ? yr + D * 0.75 + 0.33 : yr + D * 0.65 + 0.2\n    const xm = (st.m0 + st.m1) / 2\n    k.spline('cable', [[xTr, yTr - 0.02, z], [xTr - 0.15, yTr - 0.1, z], [xm + 0.12, top + 0.1, z], [xm + 0.05, top - 0.02, z]], 0.009, 6, 20)\n  }\n}\n\n/** Weld-neck flange whose face is `len` past `weld` along `dir` (for blind-flanged header ends). Returns the face. */\nfunction flangeEnd(k: Kit, weld: V3, dir: V3, nps: number, rating: Rating): V3 {\n  const f = flangeDims(nps, rating)\n  const face = addv(weld, dir, f.hubLength + f.raisedFaceHeight)\n  blFlange(k, face, dir, nps, rating)\n  return face\n}\n\n/** Meter body between its two flanges (body length `len`, centred at `c`, flow +X). */\nfunction meter(k: Kit, p: P, c: V3, len: number, D: number) {\n  const [x, y, z] = c\n  const r = D / 2\n  if (p.meterType === 'ultrasonic') {\n    k.cyl(BODY, r * 1.35, len, c, 'x', 36)\n    for (const s of [-1, 1]) k.cyl(BODY, r * 1.2, 0.04, [x + s * (len / 2 - 0.02), y, z], 'x', 36)\n    // four chordal paths: transducer pairs on opposite sides, offset along the flow\n    for (const h of [-0.62, -0.22, 0.22, 0.62])\n      for (const s of [-1, 1]) {\n        const a = Math.asin(h)\n        const n = new THREE.Vector3(0, Math.sin(a), s * Math.cos(a))\n        const b = new THREE.Vector3(x - s * len * 0.22, y, z).addScaledVector(n, r * 1.3)\n        const t = b.clone().addScaledVector(n, 0.07)\n        k.rod(BODY, b.toArray() as V3, t.toArray() as V3, 0.032, 12)\n        k.cyl('stainless', 0.036, 0.03, t.toArray() as V3, n.toArray() as V3, 12)\n        k.tube('tubing', [t.clone().addScaledVector(n, 0.015).toArray() as V3, [t.x, Math.max(t.y + 0.04, y + r * 1.4), t.z * 0.5 + z * 0.5], [x, y + r * 1.5 + 0.05, z]], 0.006, 6, 0.04)\n      }\n    // signal processing unit on a stem\n    k.cyl(BODY, 0.035, 0.18, [x, y + r * 1.35 + 0.09, z], 'y', 14)\n    k.rbox('aluminium', [0.24, 0.16, 0.2], 0.03, [x, y + r * 1.35 + 0.25, z])\n    k.cyl('aluminium', 0.07, 0.03, [x, y + r * 1.35 + 0.25, z + 0.11], 'z', 20)\n    k.disc('glass', 0.05, [x, y + r * 1.35 + 0.25, z + 0.126], 'z', 20)\n    k.box('nameplate', [0.12, 0.07, 0.003], [x, y, z + r * 1.36])\n  } else {\n    k.cyl(BODY, r * 1.12, len, c, 'x', 32)\n    k.cyl(BODY, r * 1.2, len * 0.3, c, 'x', 32)\n    k.cyl(BODY, 0.03, r * 0.5, [x, y + r * 1.2 + r * 0.25, z], 'y', 12)\n    k.hex('stainless', 0.05, 0.03, [x, y + r * 1.2 + r * 0.5, z])\n    k.cyl('aluminium', 0.06, 0.14, [x, y + r * 1.2 + r * 0.5 + 0.1, z], 'y', 18)\n    k.cyl('aluminium', 0.065, 0.02, [x, y + r * 1.2 + r * 0.5 + 0.18, z], 'y', 18)\n    k.box('nameplate', [0.1, 0.06, 0.003], [x, y, z + r * 1.21])\n  }\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": "MeteringSkid",
    "anchor": "base",
    "standards": [
      "API MPMS Ch. 4 / 5",
      "ISO 17089-1",
      "AGA 9",
      "ASME B16.5",
      "ASME B16.10"
    ]
  }
}