{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "cement-unit",
  "type": "registry:component",
  "title": "Cementing unit (twin pump skid)",
  "description": "Offshore twin-pump cementing skid, about 7.5 × 2.5 m: two electric-driven triplex plunger pumps (TEFC motor, guarded coupling and reduction gearbox turning when `running`, crankcase, plunger windows, fluid end with hammer-lug valve caps) feeding an HP header with plug valves, transducer, gauge and pop-off valve to a 2\" discharge flange. Recirculating mixer tub with agitator, mixing head under the bulk cement inlet, recirc pump and densitometer, mix-water inlet with butterfly valve. Two displacement tanks (`tankBbl` each) with sight gauges, grating top, handrail and ladder, a 4\" suction header to both pumps, and an operator cabin with windows, console and roof A/C.",
  "dependencies": [
    "three",
    "@react-three/fiber",
    "@react-three/drei"
  ],
  "registryDependencies": [
    "https://deck-twin-library.demoareeb.workers.dev/r/core.json"
  ],
  "files": [
    {
      "path": "drilling/cement-unit.tsx",
      "type": "registry:file",
      "target": "components/deck-twin/drilling/cement-unit.tsx",
      "content": "// Offshore twin-pump cementing skid (API 10A / API 7K / DNV 2.7-3 practice): electric-driven triplex plunger pumps, recirculating mixer tub, displacement tanks, HP manifold, control cabin.\nimport * as THREE from 'three'\nimport { useEffect, useMemo } from 'react'\nimport { Kit, type MatKey, type V3 } from '../lib/kit'\nimport { paint } from '../lib/materials'\nimport { KitMesh, type GroupProps } from '../lib/mesh'\nimport { flange, gauge, grating, handrail, ladder, motor, motorSize, skid, tagPlate } from '../lib/parts'\nimport { port, type Port } from '../lib/ports'\nimport { Rotors, cowlFan, guardedCoupling, type RotorSpec } from '../lib/rotors'\nimport { flange as flangeDims, pipeOD, pipeWall, type Rating } from '../lib/standards'\nimport { hammerCap } from './_drill'\n\nexport interface CementUnitProps {\n  /** drive motor per pump, kW */\n  kw?: number\n  /** displacement tank volume each, bbl */\n  tankBbl?: number\n  dischargeRating?: Rating\n  color?: string\n  tag?: string\n  /** turn the drives and the tub agitator */\n  running?: boolean\n}\n\nexport const defaults = { kw: 300, tankBbl: 10, dischargeRating: 2500 as Rating, color: '#c8352b', tag: 'CU-01', running: true }\n\ntype P = typeof defaults\n\n// typical 7.5 × 2.5 m skid, two 10 bbl displacement tanks\nconst L = 7.5\nconst W = 2.5\nconst yb = 0.208\n\nfunction layout(p: Omit<P, 'tag' | 'running' | 'color' | 'kw'>) {\n  const v = Math.max(5, Math.min(20, p.tankBbl)) * 0.159\n  const th = 1.4\n  const tw = Math.min(1.15, Math.sqrt(v / th))\n  const tl = v / th / tw\n  return {\n    th, tw, tl,\n    discharge: [-0.3, 1.55, -W / 2 - 0.25] as V3,\n    water: [0.1, yb + 0.55, W / 2 + 0.3] as V3,\n    bulk: [-0.1, yb + 2.15, 0.45] as V3,\n  }\n}\n\nexport function ports(props: CementUnitProps = {}): Port[] {\n  const p = { ...defaults, ...props }\n  const l = layout(p)\n  return [\n    port('discharge', 'HP discharge (to cement head)', l.discharge, [0, 0, -1], 2, p.dischargeRating),\n    port('water', 'Mix water supply', l.water, [0, 0, 1], 4, 150),\n    port('bulk', 'Dry cement (bulk) inlet', l.bulk, [0, 1, 0], 5, 150, 'utility'),\n  ]\n}\n\nexport function CementUnit({ tag = defaults.tag, ...rest }: CementUnitProps & GroupProps) {\n  const { kw, tankBbl, dischargeRating, color, running, ...group } = { ...defaults, ...rest }\n  const out = useMemo(() => build({ kw, tankBbl, dischargeRating, color, tag, running }), [kw, tankBbl, dischargeRating, color, tag])\n  useEffect(() => () => [out.built, ...out.rotors.map((r) => r.built)].forEach((b) => b.geometry.dispose()), [out])\n  return (\n    <group {...group}>\n      <KitMesh data={out.built} />\n      <Rotors rotors={out.rotors} running={running} />\n    </group>\n  )\n}\n\nexport default CementUnit\n\nfunction build(p: P) {\n  const k = new Kit()\n  const l = layout(p)\n  const C: MatKey = paint(p.color)\n  const FE: MatKey = paint('#5b6168', { metalness: 0.45, roughness: 0.45 })\n  const rotors: RotorSpec[] = []\n  const top = skid(k, L, W, 'HEB 200', 'structSteelDark')\n\n  // two pump trains: TEFC motor, guarded coupling, reduction gearbox, triplex plunger pump\n  const m = motorSize(p.kw, 4)\n  const ys = top + m.H\n  const xm = -2.05\n  for (const zp of [-0.62, 0.62]) {\n    k.box('structSteelDark', [m.L + 0.2, 0.03, 0.7], [xm - m.L / 2, top + 0.015, zp])\n    k.at([xm, ys, zp], undefined, () => motor(k, { R: m.R, L: m.L, H: m.H - 0.03, tbox: 'top', cable: true }))\n    rotors.push(cowlFan(m.R, m.L, 300, [xm, ys, zp]))\n    rotors.push(guardedCoupling(k, xm + 0.04, xm + 0.3, ys, 0.17, top + 0.03, 'safetyYellow', 300, zp, 0.05))\n    // gearbox (input on the motor shaft line, output low to the crank)\n    const xg = xm + 0.3\n    k.rbox(C, [0.42, ys + 0.2 - top, 0.55], 0.04, [xg + 0.21, (ys + 0.2 + top) / 2, zp])\n    k.cyl('brass', 0.02, 0.08, [xg + 0.15, ys + 0.24, zp], 'y', 10)\n    // power end: crankcase, crosshead section, plunger windows\n    const xp = xg + 0.42\n    k.rbox(C, [0.6, 0.62, 0.85], 0.06, [xp + 0.3, top + 0.31, zp])\n    k.cyl(C, 0.3, 0.86, [xp + 0.25, top + 0.48, zp], 'z', 32)\n    k.box(C, [0.25, 0.42, 0.75], [xp + 0.72, top + 0.33, zp])\n    // fluid end with three plungers, valve caps on top and front, suction manifold below\n    const xf = xp + 0.95\n    k.rbox(FE, [0.32, 0.4, 0.82], 0.03, [xf, top + 0.36, zp])\n    for (const dz of [-0.26, 0, 0.26]) {\n      k.cyl('stainless', 0.045, 0.14, [xp + 0.88, top + 0.33, zp + dz], 'x', 16)\n      k.at([xf, top + 0.56, zp + dz], 'y', () => hammerCap(k, FE, 0.075, 0.07))\n      k.at([xf + 0.16, top + 0.33, zp + dz], 'x', () => hammerCap(k, FE, 0.07, 0.06))\n    }\n    k.cyl(FE, 0.07, 0.95, [xf, top + 0.1, zp], 'z', 20)\n    k.box('nameplate', [0.2, 0.12, 0.003], [xp + 0.3, top + 0.4, zp + Math.sign(zp) * 0.428])\n    // HP discharge riser with plug valve to the common header\n    k.cyl('flangeSteel', 0.04, 1.55 - (top + 0.54), [xf - 0.22, (1.55 + top + 0.54) / 2, zp], 'y', 14)\n    k.rbox('valveBody', [0.14, 0.14, 0.16], 0.02, [xf - 0.22, 1.15, zp])\n    k.rod('safetyYellow', [xf - 0.22, 1.15, zp], [xf - 0.22, 1.17, zp - 0.3 * Math.sign(zp)], 0.012, 8)\n  }\n\n  // HP header across the pumps, transducer and gauge, pop-off valve, discharge flange at -Z\n  const xh = -0.3\n  const xfR = xm + 0.3 + 0.42 + 0.95 - 0.22\n  for (const zp of [-0.62, 0.62]) k.tube('flangeSteel', [[xfR, 1.55, zp], [xh, 1.55, zp]], 0.04, 12, 0.1)\n  k.pipe('flangeSteel', [xh, 1.55, 0.7], [xh, 1.55, l.discharge[2] + flangeDims(2, p.dischargeRating).hubLength + flangeDims(2, p.dischargeRating).raisedFaceHeight], 0.1, 0.03)\n  flange(k, 2, p.dischargeRating, l.discharge, '-z', true)\n  k.box('structSteelDark', [0.08, 1.55 - top - 0.05, 0.08], [xh, (1.55 + top) / 2 - 0.025, -W / 2 + 0.15])\n  k.cyl('stainless', 0.025, 0.14, [xh, 1.62, -0.3], 'y', 12)\n  gauge(k, [xh, 1.74, -0.3], 'x', 0.14, 'bar', 1000)\n  k.rbox('actuatorRed', [0.12, 0.18, 0.12], 0.02, [xh, 1.67, 0.3])\n  k.cyl('actuatorRed', 0.035, 0.18, [xh, 1.85, 0.3], 'y', 14)\n\n  // recirculating mixer: tub on legs with agitator, jet mixing head and bulk inlet, recirc pump, densitometer\n  const xt = 0.25\n  const zt = 0.45\n  const rT = 0.62\n  const y0 = yb + 0.75\n  const y1 = y0 + 0.95\n  for (let i = 0; i < 4; i++) {\n    const a = (i / 4) * Math.PI * 2 + Math.PI / 4\n    k.box('structSteelDark', [0.08, y0 - top, 0.08], [xt + Math.cos(a) * rT * 0.8, (y0 + top) / 2, zt + Math.sin(a) * rT * 0.8])\n  }\n  k.lathe(C, [[0.1, y0 - 0.15], [rT, y0], [rT, y1], [rT + 0.03, y1], [rT + 0.03, y1 + 0.03], [rT - 0.01, y1 + 0.03], [rT - 0.01, y0 + 0.01], [0.1, y0 - 0.14]], [xt, 0, zt], 'y', 40)\n  k.disc(paint('#a7a49c', { metalness: 0, roughness: 0.3, weather: 0 }), rT - 0.012, [xt, y1 - 0.25, zt], 'y', 40)\n  k.box(C, [2 * rT + 0.1, 0.1, 0.12], [xt, y1 + 0.08, zt])\n  k.rbox('machineryGreen', [0.25, 0.25, 0.25], 0.02, [xt, y1 + 0.26, zt])\n  k.at([xt, y1 + 0.26, zt + 0.13], undefined, () => k.cyl('motorPaint', 0.11, 0.3, [0, 0, 0.15], 'z', 24))\n  const ag = new Kit()\n  ag.cyl('stainless', 0.025, y1 + 0.13 - (y0 + 0.15), [0, (y1 + 0.13 + y0 + 0.15) / 2, 0], 'y', 10)\n  for (let i = 0; i < 3; i++) {\n    const a = (i / 3) * Math.PI * 2\n    ag.box('stainless', [0.22, 0.01, 0.08], [Math.cos(a) * 0.13, y0 + 0.2, Math.sin(a) * 0.13], new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 1, 0), -a).multiply(new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(1, 0, 0), 0.6)))\n  }\n  rotors.push({ built: ag.build(), axis: 'y', pos: [xt, 0, zt], rpm: 80 })\n  // mixing head on the tub rim and the bulk cement inlet line\n  const b = l.bulk\n  k.cyl(C, 0.16, 0.35, [b[0], y1 + 0.2, b[2]], 'y', 24)\n  k.cyl(C, 0.09, b[1] - flangeDims(5, 150).hubLength - (y1 + 0.37), [b[0], (b[1] - flangeDims(5, 150).hubLength + y1 + 0.37) / 2, b[2]], 'y', 20)\n  flange(k, 5, 150, b, 'y', true)\n  // recirc pump set under the tub on the -Z side, densitometer spool and lines into the tub\n  const rm = motorSize(37, 4)\n  const zr = -0.45\n  k.at([xt + 0.25, top + rm.H, zr], undefined, () => motor(k, { R: rm.R, L: rm.L, H: rm.H, tbox: 'top' }))\n  k.cyl(C, 0.17, 0.12, [xt + 0.45, top + rm.H, zr], 'x', 28)\n  k.tube(C, [[xt + 0.45, top + rm.H + 0.15, zr], [xt + 0.45, y1 + 0.15, zr], [xt + 0.45, y1 + 0.15, zt - rT * 0.5], [xt + 0.3, y1 - 0.05, zt - rT * 0.5]], 0.05, 12, 0.1)\n  k.rbox('stainless', [0.14, 0.18, 0.2], 0.02, [xt + 0.45, top + 1.0, zr])\n  k.tube(C, [[xt, y0 - 0.14, zt], [xt, top + 0.2, zt], [xt + 0.57, top + 0.2, zt], [xt + 0.57, top + rm.H, zr + 0.05]], 0.055, 12, 0.1)\n  // mix-water inlet (+Z) with butterfly valve\n  const w = l.water\n  const fw = flange(k, 4, 150, w, 'z', true)\n  k.tube('pipePaint', [[w[0], w[1], w[2] - fw], [w[0], w[1], zt + rT + 0.05], [w[0], y1 - 0.1, zt + rT + 0.05], [w[0], y1 - 0.1, zt + rT - 0.05]], pipeOD(4) / 2, 16, 0.12)\n  k.cyl('valveBody', 0.08, 0.06, [w[0], w[1], w[2] - fw - 0.25], 'z', 24)\n  k.rod('actuatorRed', [w[0], w[1] + 0.08, w[2] - fw - 0.25], [w[0] + 0.25, w[1] + 0.1, w[2] - fw - 0.25], 0.012, 8)\n\n  // displacement tanks with sight gauges, top grating, handrail and ladder; outlets to the pump suction header\n  const xd = 1.75\n  const yTop = yb + l.th + 0.05\n  for (const s of [-1, 1]) {\n    const zc = s * (l.tw / 2 + 0.05)\n    k.box(C, [l.tl, l.th, l.tw], [xd, yb + l.th / 2 + 0.03, zc])\n    for (let i = 1; i < 3; i++) k.box(C, [l.tl + 0.03, 0.05, l.tw + 0.03], [xd, yb + (l.th * i) / 3, zc])\n    k.cyl('glass', 0.025, l.th - 0.2, [xd - l.tl / 4, yb + l.th / 2, zc + s * (l.tw / 2 + 0.05)], 'y', 12)\n    k.box('stainless', [0.03, l.th - 0.2, 0.01], [xd - l.tl / 4 + 0.05, yb + l.th / 2, zc + s * (l.tw / 2 + 0.035)])\n    for (const yy of [yb + 0.15, yb + l.th - 0.08]) k.rod('stainless', [xd - l.tl / 4, yy, zc + s * l.tw / 2], [xd - l.tl / 4, yy, zc + s * (l.tw / 2 + 0.05)], 0.01, 8)\n    tagPlate(k, `DISP TANK ${s < 0 ? 'A' : 'B'}  ${p.tankBbl} BBL`, [xd + 0.15, yb + l.th * 0.8, zc + s * (l.tw / 2 + 0.002)], s < 0 ? '-z' : 'z', 0.32)\n    k.tube(C, [[xd - l.tl / 2, yb + 0.15, zc], [xd - l.tl / 2 - 0.2, yb + 0.15, zc], [xd - l.tl / 2 - 0.2, yb + 0.15, 0]], pipeOD(4) / 2, 12, 0.1)\n  }\n  grating(k, [xd, yTop, 0], l.tl, 2 * l.tw + 0.1)\n  handrail(k, [[xd + 0.05, yTop, l.tw + 0.05], [xd - l.tl / 2, yTop, l.tw + 0.05], [xd - l.tl / 2, yTop, -l.tw - 0.05], [xd + l.tl / 2, yTop, -l.tw - 0.05], [xd + l.tl / 2, yTop, l.tw + 0.05], [xd + 0.55, yTop, l.tw + 0.05]])\n  ladder(k, [xd + 0.3, top, W / 2 - 0.04], yTop, [0, 0, 1], { cage: false })\n  for (const dx of [0.075, 0.525]) k.box('safetyYellow', [0.04, 0.04, W / 2 - 0.04 - l.tw], [xd + dx, yTop - 0.3, (W / 2 - 0.04 + l.tw) / 2])\n  // suction header (4\") from the tanks and tub to both pump suction manifolds\n  const xfS = xm + 0.3 + 0.42 + 0.95\n  k.pipe(C, [xd - l.tl / 2 - 0.2, yb + 0.15, 0], [xfS, yb + 0.15, 0], pipeOD(4), pipeWall(4))\n  for (const zp of [-0.62, 0.62]) k.tube(C, [[xfS, yb + 0.15, 0], [xfS + 0.15, yb + 0.15, 0], [xfS + 0.15, yb + 0.15, zp * 0.6], [xfS, top + 0.1, zp * 0.6]], 0.05, 12, 0.08)\n\n  // control cabin: insulated house with windows, door, roof A/C, console visible inside\n  const xc0 = 2.55\n  const xc1 = L / 2 - 0.05\n  const hc = 2.35\n  const cx = (xc0 + xc1) / 2\n  const cl = xc1 - xc0\n  k.box('cladding', [cl, 0.04, W - 0.1], [cx, top + 0.02, 0])\n  for (const s of [-1, 1]) k.box('cladding', [cl, hc, 0.05], [cx, top + hc / 2, s * (W / 2 - 0.075)])\n  k.box('cladding', [0.05, hc, W - 0.1], [xc0 + 0.025, top + hc / 2, 0])\n  k.box('cladding', [0.05, 0.9, W - 0.1], [xc1 - 0.025, top + 0.45, 0])\n  k.box('cladding', [0.05, 0.45, W - 0.1], [xc1 - 0.025, top + hc - 0.225, 0])\n  k.box('glass', [0.02, hc - 1.35, W - 0.3], [xc1 - 0.02, top + 0.9 + (hc - 1.35) / 2, 0])\n  k.box('cladding', [cl + 0.1, 0.08, W], [cx, top + hc + 0.04, 0])\n  k.rbox('cladding', [0.7, 0.35, 0.9], 0.04, [cx, top + hc + 0.255, 0])\n  k.box('glass', [0.6, 0.6, 0.02], [cx + 0.1, top + 1.5, W / 2 - 0.045])\n  k.box(C, [0.8, 2.0, 0.03], [cx + 0.1, top + 1.0, -W / 2 + 0.035])\n  k.rod('stainless', [cx + 0.42, top + 1.0, -W / 2 + 0.02], [cx + 0.42, top + 1.0, -W / 2 - 0.03], 0.01, 8)\n  k.box('plasticGrey', [0.5, 0.85, 1.5], [xc1 - 0.35, top + 0.45, 0])\n  k.box('plasticGrey', [0.4, 0.04, 1.5], [xc1 - 0.32, top + 0.9, 0], new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 0, 1), 0.25))\n  k.box('rubberBlack', [0.1, 0.4, 0.5], [xc1 - 0.6, top + 1.15, 0])\n\n  tagPlate(k, p.tag, [-L / 2 + 0.9, 0.11, W / 2 + 0.002], 'z', 0.3)\n  tagPlate(k, 'DNV 2.7-3', [-L / 2 + 1.3, 0.11, W / 2 + 0.002], 'z', 0.2)\n  return { built: k.build(), rotors }\n}\n"
    },
    {
      "path": "drilling/_drill.ts",
      "type": "registry:file",
      "target": "components/deck-twin/drilling/_drill.ts",
      "content": "// Shared drilling & subsea parts: API 6A flanges and gate valves, hammer-lug covers, convex hulls, ROV buckets, hubs and clamps, mudmats.\nimport * as THREE from 'three'\nimport { mat4, type Kit, type MatKey, type V3 } from '../lib/kit'\nimport { flange, liftingLug } from '../lib/parts'\nimport { flange as asmeFlange, inch, nearest, pipeOD, type Rating } from '../lib/standards'\n\n// ------------------------------------------------------------------ API 6A (typical 6B / 6BX dims, inches: OD, thickness, bolt circle, bolts, bolt dia)\n\nexport type Psi = 5000 | 10000 | 15000\n\ntype Row = [od: number, t: number, bc: number, n: number, bd: number]\n\nconst API: Record<Psi, Record<number, Row>> = {\n  5000: {\n    2.0625: [8.5, 1.81, 6.5, 8, 0.875], 2.5625: [9.62, 1.94, 7.5, 8, 1.0], 3.125: [10.5, 2.19, 8.0, 8, 1.125],\n    4.0625: [12.25, 2.44, 9.5, 8, 1.25], 5.125: [14.75, 3.19, 11.5, 8, 1.5], 7.0625: [15.5, 3.62, 12.5, 12, 1.375],\n  },\n  10000: {\n    2.0625: [7.88, 1.73, 6.25, 8, 0.75], 2.5625: [9.12, 2.02, 7.25, 8, 0.875], 3.0625: [10.62, 2.3, 8.5, 8, 1.0],\n    4.0625: [12.44, 2.77, 10.19, 8, 1.125], 5.125: [14.06, 3.12, 11.81, 12, 1.125], 7.0625: [18.88, 4.06, 15.88, 12, 1.5],\n  },\n  15000: {\n    2.0625: [8.75, 2.0, 6.88, 8, 0.875], 2.5625: [10.0, 2.25, 7.88, 8, 1.0], 3.0625: [11.31, 2.53, 9.06, 8, 1.125],\n    4.0625: [14.19, 3.09, 11.44, 8, 1.375], 5.125: [16.5, 3.88, 13.63, 12, 1.5], 7.0625: [19.88, 4.69, 16.88, 16, 1.5],\n  },\n}\n\n// typical API 6A slab-gate face-to-face, inches\nconst GATE: Record<Psi, Record<number, number>> = {\n  5000: { 2.0625: 14.62, 2.5625: 16.62, 3.125: 18.62, 4.0625: 21.62, 5.125: 28.62, 7.0625: 29.0 },\n  10000: { 2.0625: 20.5, 2.5625: 22.25, 3.0625: 24.38, 4.0625: 26.38, 5.125: 29.0, 7.0625: 35.0 },\n  15000: { 2.0625: 19.0, 2.5625: 21.0, 3.0625: 23.56, 4.0625: 29.0, 5.125: 35.0, 7.0625: 40.0 },\n}\n\nexport interface ApiFlange {\n  bore: number\n  od: number\n  t: number\n  bolts: number\n  boltDia: number\n  boltCircle: number\n  ring: number\n}\n\nexport function apiFlange(bore: number, psi: Psi = 10000): ApiFlange {\n  const tbl = API[psi] ?? API[10000]\n  const b = nearest(Object.keys(tbl).map(Number), bore)\n  const [od, t, bc, n, bd] = tbl[b]\n  return { bore: b, od: inch(od), t: inch(t), bolts: n, boltDia: inch(bd), boltCircle: inch(bc), ring: inch(bc - bd * 1.9) }\n}\n\nexport function apiGateLength(bore: number, psi: Psi = 10000): number {\n  const tbl = GATE[psi] ?? GATE[10000]\n  return inch(tbl[nearest(Object.keys(tbl).map(Number), bore)])\n}\n\n/** ring-gasket half gap at an RTJ joint */\nexport const G = 0.003\nconst rBore = (d: ApiFlange) => d.bore * 0.0127\n\n/** Hollow tube along local Y. */\nexport function tubeY(k: Kit, mat: MatKey, ro: number, ri: number, y0: number, y1: number, seg = 28) {\n  k.lathe(mat, [[ri, y0], [ro, y0], [ro, y1], [ri, y1]], [0, 0, 0], 'y', seg)\n  k.lathe('pipeBore', [[ri, Math.max(y0, y1)], [ri, Math.min(y0, y1)]], [0, 0, 0], 'y', seg)\n}\n\n/** Integral API flange, ring face at local y = face, body on side s (+1 above, -1 below). */\nexport function apiFlangeAt(k: Kit, d: ApiFlange, face: number, s: 1 | -1, mat: MatKey) {\n  const f0 = face + s * G\n  const f1 = face + s * (G + d.t)\n  const lo = Math.min(f0, f1)\n  const hi = Math.max(f0, f1)\n  const ch = Math.min(0.006, d.t * 0.12)\n  const rb = rBore(d)\n  const R = d.od / 2\n  const prof: [number, number][] = s > 0 ? [[rb, lo], [R, lo], [R, hi - ch], [R - ch, hi], [rb, hi]] : [[rb, lo], [R - ch, lo], [R, lo + ch], [R, hi], [rb, hi]]\n  k.lathe(mat, prof, [0, 0, 0], 'y', d.bolts >= 12 ? 40 : 28)\n}\n\n/** Studs, nuts and ring gasket for two API flanges meeting at local y = yj. */\nexport function apiJoint(k: Kit, d: ApiFlange, yj: number) {\n  const nh = d.boltDia * 0.95\n  const so = d.boltDia * 0.4\n  const len = 2 * (G + d.t) + 2 * nh + 2 * so\n  k.boltCircle('boltXylan', 'nut', d.bolts, d.boltCircle / 2, [0, yj - len / 2, 0], 'y', d.boltDia, len, [so + nh / 2, len - so - nh / 2])\n  k.torus('stainless', d.ring / 2, Math.max(0.004, d.boltDia * 0.18), [0, yj, 0], 'y', 4, 28)\n}\n\n/** Flanged spool between API faces y = 0 and y = L (local Y). */\nexport function apiSpool(k: Kit, d: ApiFlange, L: number, mat: MatKey) {\n  apiFlangeAt(k, d, 0, 1, mat)\n  apiFlangeAt(k, d, L, -1, mat)\n  tubeY(k, mat, d.od * 0.3, rBore(d), G + d.t - 0.002, L - G - d.t + 0.002, 24)\n}\n\n/** Open API face at local y = 0 (flange body below): machined face and ring groove; optional studs for a studded outlet. */\nexport function apiStuddedFace(k: Kit, d: ApiFlange, studs = true) {\n  const nh = d.boltDia * 0.95\n  k.lathe('machined', [[d.ring / 2 + d.boltDia * 0.6, -G + 0.0008], [rBore(d), -G + 0.0008]], [0, 0, 0], 'y', 32)\n  k.torus('pipeBore', d.ring / 2, Math.max(0.003, d.boltDia * 0.16), [0, -G + 0.001, 0], 'y', 6, 32)\n  if (studs) k.boltCircle('boltXylan', 'nut', d.bolts, d.boltCircle / 2, [0, -d.boltDia * 1.2, 0], 'y', d.boltDia, d.boltDia * 1.2 + G * 2 + d.t + nh * 1.4, [d.boltDia * 1.2 + G * 2 + d.t + nh * 0.5])\n}\n\nexport type GateOp = { kind: 'handwheel'; D: number; mat?: MatKey } | { kind: 'hydraulic'; r: number; len: number }\n\n/** API 6A slab gate valve between flange faces y = 0 and y = L, bonnet along local +Z. */\nexport function apiGate(k: Kit, d: ApiFlange, L: number, op: GateOp, mat: MatKey = 'valveBody') {\n  apiFlangeAt(k, d, 0, 1, mat)\n  apiFlangeAt(k, d, L, -1, mat)\n  const rb = rBore(d)\n  tubeY(k, mat, d.od * 0.3, rb, G + d.t - 0.002, L - G - d.t + 0.002, 24)\n  const w = d.od * 0.8\n  const dz = d.od * 0.92\n  const hb = Math.max(0.05, Math.min(d.od * 1.0, L - 2 * (G + d.t) - 0.02))\n  const yc = L / 2\n  k.rbox(mat, [w, hb, dz], Math.min(0.025, w * 0.1), [0, yc, 0])\n  k.cyl('brass', 0.008, 0.03, [w / 2 + 0.012, yc + hb * 0.25, 0], 'x', 8)\n  k.hex('brass', 0.017, 0.012, [w / 2 + 0.029, yc + hb * 0.25, 0], 'x')\n  const rbf = Math.min(w * 0.5, hb * 0.5)\n  let z = dz / 2\n  const tbf = Math.max(0.03, d.t * 0.6)\n  k.cyl(mat, rbf, tbf, [0, yc, z + tbf / 2], 'z', 28)\n  k.around(8, rbf * 0.8, [0, yc, z + tbf + 0.008], 'z', (p) => k.hex('nut', Math.max(0.022, d.boltDia * 1.3), 0.016, p, 'z'), Math.PI / 8)\n  z += tbf\n  const bl = 0.07 + d.od * 0.18\n  const rbo = rbf * 0.66\n  k.cyl(mat, rbo, bl, [0, yc, z + bl / 2], 'z', 24)\n  z += bl\n  if (op.kind === 'handwheel') {\n    const sr = Math.max(0.011, d.od * 0.045)\n    k.cyl(mat, rbo * 0.62, 0.04, [0, yc, z + 0.02], 'z', 18)\n    k.cyl('stainless', sr, 0.12, [0, yc, z + 0.06], 'z', 12)\n    k.handwheel(op.mat ?? 'actuatorRed', op.D, [0, yc, z + 0.1], 'z', 4)\n    k.hex('nut', sr * 2.4, 0.02, [0, yc, z + 0.12], 'z')\n    return z + 0.13\n  }\n  k.cyl(mat, rbo * 0.85, 0.05, [0, yc, z + 0.025], 'z', 24)\n  z += 0.05\n  const { r, len } = op\n  k.cyl('actuatorYellow', r * 1.08, 0.03, [0, yc, z + 0.015], 'z', 32)\n  k.cyl('actuatorYellow', r, len, [0, yc, z + 0.03 + len / 2], 'z', 32)\n  k.cyl('actuatorYellow', r * 1.08, 0.035, [0, yc, z + 0.03 + len + 0.0175], 'z', 32)\n  k.around(4, r * 1.04, [0, yc, 0], 'z', (p) => {\n    k.rod('stainless', [p[0], p[1], z], [p[0], p[1], z + 0.065 + len + 0.012], 0.007, 8)\n    k.hex('nut', 0.02, 0.012, [p[0], p[1], z + 0.065 + len + 0.006], 'z')\n  }, Math.PI / 4)\n  const zt = z + 0.065 + len\n  k.cyl('stainless', 0.02, 0.1, [0, yc, zt + 0.05], 'z', 14)\n  k.cyl('safetyGreen', 0.023, 0.025, [0, yc, zt + 0.03], 'z', 14)\n  k.cyl('nameplate', r * 1.002, 0.04, [0, yc, z + 0.03 + len * 0.62], 'z', 32)\n  return zt + 0.1\n}\n\n/** 1/2\" needle valve on a boss along +axis from base, T-handle to the side. Returns the outlet end. */\nexport function needleValve(k: Kit, base: V3, axis: 'x' | 'y' | 'z' | '-x' | '-z', handle: MatKey = 'actuatorRed'): V3 {\n  const v: V3 = axis === 'y' ? [0, 1, 0] : axis === 'z' ? [0, 0, 1] : axis === '-z' ? [0, 0, -1] : axis === 'x' ? [1, 0, 0] : [-1, 0, 0]\n  const p = (t: number): V3 => [base[0] + v[0] * t, base[1] + v[1] * t, base[2] + v[2] * t]\n  k.hex('stainless', 0.032, 0.02, p(0.01), axis)\n  k.box('stainless', [0.036, 0.036, 0.036], p(0.042))\n  const side: V3 = axis === 'y' ? [1, 0, 0] : [0, 1, 0]\n  const q = p(0.042)\n  k.rod('stainless', q, [q[0] + side[0] * 0.05, q[1] + side[1] * 0.05, q[2] + side[2] * 0.05], 0.006, 8)\n  k.box(handle, axis === 'y' ? [0.012, 0.012, 0.06] : [0.06, 0.012, 0.012], [q[0] + side[0] * 0.055, q[1] + side[1] * 0.055, q[2] + side[2] * 0.055])\n  k.rod('stainless', p(0.06), p(0.105), 0.008, 8)\n  return p(0.105)\n}\n\n/** Threaded hammer-lug cover (mud pump valve cover, union nut) on local +Y from y = 0: body, three lugs, centre boss. */\nexport function hammerCap(k: Kit, mat: MatKey, R: number, h: number, lugs = 3) {\n  k.cyl(mat, R, h, [0, h / 2, 0], 'y', 32)\n  k.cyl(mat, R * 0.96, 0.006, [0, h + 0.003, 0], 'y', 32)\n  for (let i = 0; i < lugs; i++) {\n    const a = (i / lugs) * Math.PI * 2\n    k.box(mat, [R * 0.42, h * 0.8, R * 0.32], [Math.cos(a) * (R + R * 0.14), h * 0.45, Math.sin(a) * (R + R * 0.14)], new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 1, 0), -a))\n  }\n  k.cyl(mat, R * 0.35, h * 0.3, [0, h + h * 0.15, 0], 'y', 20)\n}\n\n// ------------------------------------------------------------------ 2D helpers\n\n/** Convex hull (CCW) of circles sampled at n points each, as a THREE.Shape in XY. */\nexport function hullOfCircles(circles: [number, number, number][], n = 32): THREE.Shape {\n  const hull = hullPoints(circles, n)\n  const sh = new THREE.Shape()\n  hull.forEach(([x, y], i) => (i ? sh.lineTo(x, y) : sh.moveTo(x, y)))\n  sh.closePath()\n  return sh\n}\n\n/** Plate band of `thick` × `depth` (along +Z from z0) following the hull outline of the circles: guard rims, belts. */\nexport function hullBand(k: Kit, mat: MatKey, circles: [number, number, number][], z0: number, depth: number, thick: number, n = 48) {\n  const h = hullPoints(circles, n)\n  for (let i = 0; i < h.length; i++) {\n    const [x0, y0] = h[i]\n    const [x1, y1] = h[(i + 1) % h.length]\n    const len = Math.hypot(x1 - x0, y1 - y0)\n    if (len < 1e-5) continue\n    const nx = (y1 - y0) / len\n    const ny = -(x1 - x0) / len\n    const q = new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 0, 1), Math.atan2(y1 - y0, x1 - x0))\n    k.box(mat, [len + thick * 0.6, thick, depth], [(x0 + x1) / 2 - (nx * thick) / 2, (y0 + y1) / 2 - (ny * thick) / 2, z0 + depth / 2], q)\n  }\n}\n\n/** Flat convex face (triangle fan) over the hull of the circles at z = z0, facing +Z (or -Z when flip). UVs scaled by uvs per metre. */\nexport function hullFace(circles: [number, number, number][], z0: number, flip = false, uvs = 1, n = 48): THREE.BufferGeometry {\n  const h = hullPoints(circles, n)\n  const cx = h.reduce((a, p) => a + p[0], 0) / h.length\n  const cy = h.reduce((a, p) => a + p[1], 0) / h.length\n  const pos: number[] = [cx, cy, z0]\n  const uv: number[] = [cx * uvs, cy * uvs]\n  for (const [x, y] of h) pos.push(x, y, z0), uv.push(x * uvs, y * uvs)\n  const idx: number[] = []\n  for (let i = 0; i < h.length; i++) {\n    const a = 1 + i\n    const b = 1 + ((i + 1) % h.length)\n    if (flip) idx.push(0, b, a)\n    else idx.push(0, a, b)\n  }\n  const g = new THREE.BufferGeometry()\n  g.setAttribute('position', new THREE.Float32BufferAttribute(pos, 3))\n  g.setAttribute('uv', new THREE.Float32BufferAttribute(uv, 2))\n  g.setIndex(idx)\n  g.computeVertexNormals()\n  return g\n}\n\nexport function hullPoints(circles: [number, number, number][], n = 32): [number, number][] {\n  const pts: [number, number][] = []\n  for (const [x, y, r] of circles) for (let i = 0; i < n; i++) pts.push([x + Math.cos((i / n) * Math.PI * 2) * r, y + Math.sin((i / n) * Math.PI * 2) * r])\n  pts.sort((a, b) => a[0] - b[0] || a[1] - b[1])\n  const cross = (o: number[], a: number[], b: number[]) => (a[0] - o[0]) * (b[1] - o[1]) - (a[1] - o[1]) * (b[0] - o[0])\n  const lo: [number, number][] = []\n  for (const p of pts) {\n    while (lo.length >= 2 && cross(lo[lo.length - 2], lo[lo.length - 1], p) <= 0) lo.pop()\n    lo.push(p)\n  }\n  const up: [number, number][] = []\n  for (let i = pts.length - 1; i >= 0; i--) {\n    const p = pts[i]\n    while (up.length >= 2 && cross(up[up.length - 2], up[up.length - 1], p) <= 0) up.pop()\n    up.push(p)\n  }\n  return lo.slice(0, -1).concat(up.slice(0, -1))\n}\n\n/** Matrix placing a shape drawn in XY onto the plane z = z0 (extrusion runs +Z). */\nexport const atZ = (z0: number) => mat4([0, 0, z0])\n\n// ------------------------------------------------------------------ subsea\n\n/** Mudmat at seabed y = 0: plate with edge skirts and stiffeners, top at y = t. */\nexport function mudmat(k: Kit, sx: number, sz: number, opts: { skirt?: number; mat?: MatKey; t?: number; padeyes?: boolean } = {}) {\n  const mat = opts.mat ?? 'equipmentPaint'\n  const t = opts.t ?? 0.05\n  const sk = opts.skirt ?? 0.25\n  // skirts penetrate the seabed; plate rests on y = 0\n  k.box(mat, [sx, t, sz], [0, t / 2, 0])\n  for (const s of [-1, 1]) {\n    k.box(mat, [sx, sk, 0.02], [0, -sk / 2 + 0.001, s * (sz / 2 - 0.01)])\n    k.box(mat, [0.02, sk, sz], [s * (sx / 2 - 0.01), -sk / 2 + 0.001, 0])\n  }\n  // top stiffeners (flat bar grid)\n  const nx = Math.max(2, Math.round(sx / 1.2))\n  const nz = Math.max(2, Math.round(sz / 1.2))\n  for (let i = 1; i < nx; i++) k.box(mat, [0.02, 0.12, sz - 0.04], [-sx / 2 + (sx * i) / nx, t + 0.06, 0])\n  for (let i = 1; i < nz; i++) k.box(mat, [sx - 0.04, 0.12, 0.02], [0, t + 0.06, -sz / 2 + (sz * i) / nz])\n  // water evacuation holes with short vent pipes\n  for (const sx2 of [-1, 1]) for (const sz2 of [-1, 1]) k.cyl(mat, 0.05, 0.1, [sx2 * sx * 0.25, t + 0.05, sz2 * sz * 0.25], 'y', 14, undefined, true)\n  if (opts.padeyes !== false) for (const sx2 of [-1, 1]) for (const sz2 of [-1, 1]) liftingLug(k, [sx2 * (sx / 2 - 0.2), t, sz2 * (sz / 2 - 0.2)], 'x', 1.6, mat)\n  return t\n}\n\n/** Sacrificial Al-Zn-In anode on two stand-off cores, long axis along `along`, centre at c. */\nexport function anode(k: Kit, c: V3, along: 'x' | 'z' | 'y' = 'x', len = 0.6) {\n  const size: V3 = along === 'x' ? [len, 0.1, 0.12] : along === 'z' ? [0.12, 0.1, len] : [0.12, len, 0.1]\n  k.rbox('aluminium', size, 0.02, c)\n  const off = len * 0.55\n  for (const s of [-1, 1]) {\n    const e: V3 = along === 'x' ? [c[0] + s * off, c[1], c[2]] : along === 'z' ? [c[0], c[1], c[2] + s * off] : [c[0], c[1] + s * off, c[2]]\n    k.box('stainless', [0.03, 0.03, 0.03], e)\n  }\n}\n\n/** API 17D class-4 style ROV torque bucket (open funnel, docking slots) on a back plate, opening facing +axis from base. */\nexport function rovBucket(k: Kit, base: V3, axis: 'x' | 'z' | '-x' | '-z' | 'y', mat: MatKey = 'actuatorYellow') {\n  k.at(base, axis, () => {\n    k.box(mat, [0.32, 0.02, 0.32], [0, 0.01, 0])\n    k.lathe(mat, [[0.07, 0.02], [0.085, 0.02], [0.085, 0.14], [0.11, 0.2], [0.1, 0.2], [0.075, 0.145], [0.07, 0.145]], [0, 0, 0], 'y', 28)\n    k.lathe('pipeBore', [[0.07, 0.145], [0.07, 0.025]], [0, 0, 0], 'y', 24)\n    k.cyl('stainless', 0.025, 0.04, [0, 0.04, 0], 'y', 6)\n    // docking slots and position indicator\n    for (const s of [-1, 1]) k.box('nut', [0.016, 0.05, 0.02], [s * 0.086, 0.17, 0])\n    k.box('nut', [0.05, 0.004, 0.012], [0, 0.022, 0.13])\n  })\n}\n\n/** Subsea hub (API 17R style) on local +Y from base along `axis`: neck, tapered hub profile, seal face, optional protection cap. Face at base + len. */\nexport function hub(k: Kit, base: V3, axis: 'x' | 'z' | '-x' | '-z' | 'y', boreR: number, len = 0.35, mat: MatKey = 'equipmentPaint', cap = false) {\n  const R = Math.max(0.12, boreR * 2.4)\n  k.at(base, axis, () => {\n    k.lathe(mat, [[boreR, 0], [R * 0.62, 0], [R * 0.62, len * 0.5], [R * 0.75, len * 0.55], [R, len * 0.78], [R, len - 0.01], [R * 0.95, len], [boreR, len]], [0, 0, 0], 'y', 40)\n    k.lathe('pipeBore', [[boreR, len], [boreR, -0.05]], [0, 0, 0], 'y', 24)\n    k.lathe('machined', [[R * 0.9, len + 0.001], [boreR, len + 0.001]], [0, 0, 0], 'y', 32)\n    if (cap) {\n      k.lathe('actuatorYellow', [[R * 1.04, len * 0.7], [R * 1.12, len * 0.7], [R * 1.12, len + 0.12], [0, len + 0.12]], [0, 0, 0], 'y', 32)\n      k.cyl('nut', 0.03, 0.08, [0, len + 0.16, 0], 'y', 6)\n    }\n  })\n  return R\n}\n\n// ------------------------------------------------------------------ chokes and frames\n\n/** Matrix whose local +Y runs along `flow` and local +Z along `stem`, origin at o. */\nexport function flowFrame(o: V3, flow: V3, stem: V3) {\n  const y = new THREE.Vector3(...flow).normalize()\n  const z = new THREE.Vector3(...stem).normalize()\n  const x = new THREE.Vector3().crossVectors(y, z).normalize()\n  return new THREE.Matrix4().makeBasis(x, y, z).setPosition(...o)\n}\n\n/** Angle choke body centre to inlet face (along -X) and outlet face (along -Y). */\nexport function chokeDims(dIn: ApiFlange, dOut: ApiFlange) {\n  const B = Math.max(dIn.od, dOut.od) * 0.78\n  return { B, inlet: B / 2 + 0.05 + dIn.t + G, outlet: B / 2 + 0.09 + dOut.t + G }\n}\n\n/** API 6A / 16C angle choke at the origin: inlet face -X, outlet face -Y, bonnet and operator along +X. Returns the operator's far x and its hose port. */\nexport function angleChoke(k: Kit, dIn: ApiFlange, dOut: ApiFlange, op: 'handwheel' | 'hydraulic', mat: MatKey = 'valveBody'): { end: number; hose: V3 | null } {\n  const { B, inlet, outlet } = chokeDims(dIn, dOut)\n  k.rbox(mat, [B, B, B * 0.92], Math.min(0.03, B * 0.12), [0, 0, 0])\n  const ri = rBore(dIn)\n  const ro = rBore(dOut)\n  k.at([0, 0, 0], '-x', () => tubeY(k, mat, dIn.od * 0.3, ri, B / 2 - 0.01, inlet - dIn.t - G + 0.002, 24))\n  k.at([0, 0, 0], '-y', () => tubeY(k, mat, dOut.od * 0.32, ro, B / 2 - 0.01, outlet - dOut.t - G + 0.002, 24))\n  k.at([-inlet, 0, 0], '-x', () => apiFlangeAt(k, dIn, 0, -1, mat))\n  k.at([0, -outlet, 0], '-y', () => apiFlangeAt(k, dOut, 0, -1, mat))\n  k.disc('internalsSteel', ri * 1.02, [-B / 2 + 0.012, 0, 0], '-x', 24)\n  k.disc('internalsSteel', ro * 1.02, [0, -B / 2 + 0.012, 0], '-y', 24)\n  // bonnet nut with hammer lugs, wear-sleeve bleed plug\n  k.hex('brass', 0.022, 0.016, [0, B * 0.25, B * 0.46 + 0.008], 'z')\n  let x = B / 2\n  const rn = B * 0.42\n  k.cyl(mat, rn * 0.9, 0.02, [x + 0.01, 0, 0], 'x', 24)\n  x += 0.02\n  k.cyl(mat, rn, 0.07, [x + 0.035, 0, 0], 'x', 24)\n  for (let i = 0; i < 3; i++) {\n    const a = (i / 3) * Math.PI * 2 + Math.PI / 6\n    k.box(mat, [0.06, B * 0.2, B * 0.13], [x + 0.035, Math.cos(a) * (rn + B * 0.08), Math.sin(a) * (rn + B * 0.08)], new THREE.Quaternion().setFromEuler(new THREE.Euler(-a, 0, 0)))\n  }\n  x += 0.07\n  k.cyl(mat, rn * 0.55, 0.1, [x + 0.05, 0, 0], 'x', 20)\n  x += 0.1\n  // position indicator sleeve with scale ring\n  k.cyl('stainless', rn * 0.4, 0.07, [x + 0.035, 0, 0], 'x', 18)\n  k.cyl('brass', rn * 0.42, 0.012, [x + 0.02, 0, 0], 'x', 18)\n  k.box('actuatorRed', [0.05, 0.004, 0.012], [x + 0.035, rn * 0.4 + 0.002, 0])\n  x += 0.07\n  if (op === 'handwheel') {\n    k.cyl('stainless', 0.014, 0.1, [x + 0.05, 0, 0], 'x', 10)\n    k.handwheel('actuatorRed', Math.max(0.3, B * 1.3), [x + 0.07, 0, 0], 'x', 4)\n    return { end: x + 0.1, hose: null }\n  }\n  // hydraulic rotary-gear actuator: gear housing, double-acting cylinder, stroke-position transmitter, manual override\n  k.cyl(mat, rn * 0.35, 0.05, [x + 0.025, 0, 0], 'x', 14)\n  x += 0.05\n  k.rbox('actuatorYellow', [0.2, 0.2, 0.22], 0.02, [x + 0.1, 0, 0])\n  k.cyl('actuatorYellow', 0.07, 0.42, [x + 0.1, 0.0, 0.0], 'z', 24)\n  for (const s of [-1, 1]) {\n    k.cyl('actuatorYellow', 0.078, 0.03, [x + 0.1, 0, s * 0.21], 'z', 24)\n    k.cyl('brass', 0.012, 0.035, [x + 0.1, 0.07, s * 0.19], 'y', 10)\n  }\n  k.rbox('stainless', [0.08, 0.1, 0.08], 0.01, [x + 0.25, 0.04, 0])\n  k.cyl('brass', 0.012, 0.03, [x + 0.25, -0.025, 0], 'y', 8)\n  k.hex('nut', 0.04, 0.03, [x + 0.1, 0.115, 0], 'y')\n  k.box('nameplate', [0.08, 0.05, 0.002], [x + 0.1, 0, 0.112])\n  return { end: x + 0.3, hose: [x + 0.1, 0.105, 0.19] }\n}\n\n/** ROV grab bar: round bar on two stand-offs between a and b, stand-off along `out`. */\nexport function grabBar(k: Kit, a: V3, b: V3, out: V3, mat: MatKey = 'actuatorYellow') {\n  const o = (p: V3, s: number): V3 => [p[0] + out[0] * s, p[1] + out[1] * s, p[2] + out[2] * s]\n  k.rod(mat, o(a, 0.12), o(b, 0.12), 0.019, 10)\n  for (const p of [a, b]) k.rod(mat, p, o(p, 0.12), 0.015, 8)\n}\n\n/**\n * Subsea trunnion ball valve between flange faces at local y = 0 and y = L (flow along local +Y), stem and ROV\n * gearbox along local +Z, class-4 bucket opening along local +X. Flanges are ASME B16.5 with studs.\n */\nexport function subseaBall(k: Kit, nps: number, rating: Rating, L: number, opts: { mat?: MatKey; bucket?: boolean } = {}) {\n  const mat = opts.mat ?? 'equipmentPaint'\n  const f = asmeFlange(nps, rating)\n  const ro = pipeOD(nps) / 2\n  const R = Math.max(ro * 1.55, f.od * 0.5)\n  const fl0 = flange(k, nps, rating, [0, 0, 0], '-y', true)\n  const fl1 = flange(k, nps, rating, [0, L, 0], 'y', true)\n  k.lathe(mat, [[ro * 0.9, fl0], [ro * 1.15, fl0], [R * 0.9, L / 2 - R * 0.75], [R, L / 2 - R * 0.35], [R, L / 2 + R * 0.35], [R * 0.9, L / 2 + R * 0.75], [ro * 1.15, L - fl1], [ro * 0.9, L - fl1]], [0, 0, 0], 'y', 40)\n  // body joint flanges with studs\n  for (const y of [L / 2 - R * 0.55, L / 2 + R * 0.55]) {\n    k.cyl(mat, R * 1.08, 0.05, [0, y, 0], 'y', 40)\n    k.around(12, R * 1.0, [0, y + 0.035, 0], 'y', (p) => k.hex('nut', 0.05, 0.03, p, 'y'), Math.PI / 12)\n  }\n  // trunnion boss, stem housing, gearbox, bucket\n  k.cyl(mat, R * 0.45, R * 0.4, [0, L / 2, -R - R * 0.15], 'z', 28)\n  k.cyl(mat, R * 0.45, R * 0.5, [0, L / 2, R + R * 0.2], 'z', 28)\n  const zg = R + R * 0.45\n  k.rbox('actuatorYellow', [R * 1.5, R * 1.2, R * 0.9], 0.04, [0, L / 2, zg + R * 0.45])\n  k.cyl('actuatorYellow', R * 0.35, R * 0.5, [R * 0.75, L / 2, zg + R * 0.45], 'x', 24)\n  k.box('nut', [0.12, 0.02, 0.012], [0, L / 2 + R * 0.6, zg + R * 0.9 + 0.006])\n  if (opts.bucket !== false) rovBucket(k, [R * 1.05 + 0.25, L / 2, zg + R * 0.45], 'x')\n  k.rod('actuatorYellow', [R * 1.0, L / 2, zg + R * 0.45], [R * 1.05 + 0.25, L / 2, zg + R * 0.45], 0.05, 16)\n  return { R, top: zg + R * 0.9 }\n}\n"
    }
  ],
  "categories": [
    "drilling"
  ],
  "meta": {
    "export": "CementUnit",
    "anchor": "base",
    "standards": [
      "API 10A",
      "API 7K",
      "DNV 2.7-3",
      "ISO 14122"
    ]
  }
}