{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "thermoacoustic-stack-section-spools",
 "name": "Thermoacoustic stack-section spools: 2 in × 48.65, 58.65 and 68.65 mm (fabrication spec)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "What custom tri-clamp spool holds a thermoacoustic stack as its own section?",
 "tags": [
  "spool",
  "custom length",
  "stack",
  "thermoacoustic",
  "fabrication",
  "sanitary",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "thermoacoustic stack spool",
  "custom length tri clamp spool 68.65",
  "stack section tri clamp",
  "2 inch spool for thermoacoustic stack"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/thermoacoustic-stack-section-spools/",
 "sheet_txt": "https://xemstudio.com/objects/thermoacoustic-stack-section-spools/sheet.txt",
 "sheet": {
  "basis": "Fabrication specs on standard 2 in ferrules (ISO 2852 faces as gen_hardware draws them, BPE tube Ø50.8 × 1.65); length = stack + ambient exchanger 10 + end spacer 9.8 + Type B lip 0.55 − 1.7 (the stack stands 1.7 into the hot joint's flat ring)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A plain 2 in clamp × clamp spool, ordered from a sanitary fabricator to length, that makes the stack its own section: the stack stands on the hot exchanger in the section below, through the hot joint's flat ring; the ambient exchanger sits on the stack; an 8.4 spacer runs from the exchanger to the Type B gasket lip at the top face. Nothing is welded inside.",
   "The length is set so the column fits exactly: stack + 10 + 9.8 + 0.55 − 1.7. The ambient exchanger then sits 10.35–20.35 below the top face, so the 14 mm water jacket clamps over it at 9.35 mm from the face, clear of the joint's clamp.",
   "Spec line: '2 in × L mm clamp × clamp spool, tube Ø50.8 × 1.65, two standard 2 in ferrules'. The lower end runs at the hot exchanger's temperature: the builder checks the spool, the ring and the clamp at that temperature."
  ],
  "table": {
   "columns": [
    "spool",
    "face_to_face_mm",
    "stack",
    "stack_mm",
    "ambient_exchanger_mm",
    "end_spacer_mm",
    "jacket_from_lower_face_mm"
   ],
   "rows": [
    [
     "spool-2in-48.65mm",
     48.64999999999999,
     "stack-spiral-2in-30-g1.0",
     30,
     10,
     9.8,
     25.3
    ],
    [
     "spool-2in-58.65mm",
     58.64999999999999,
     "stack-spiral-2in-40-g1.0",
     40,
     10,
     9.8,
     35.3
    ],
    [
     "spool-2in-68.65mm",
     68.64999999999999,
     "stack-spiral-2in-50-g1.0",
     50,
     10,
     9.8,
     45.3
    ]
   ]
  }
 },
 "sheet_text": "Thermoacoustic stack-section spools: 2 in × 48.65, 58.65 and 68.65 mm (fabrication spec) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/thermoacoustic-stack-section-spools/  (CC BY 4.0)\nBasis: Fabrication specs on standard 2 in ferrules (ISO 2852 faces as gen_hardware draws them, BPE tube Ø50.8 × 1.65); length = stack + ambient exchanger 10 + end spacer 9.8 + Type B lip 0.55 − 1.7 (the stack stands 1.7 into the hot joint's flat ring)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A plain 2 in clamp × clamp spool, ordered from a sanitary fabricator to length, that makes the stack its own section: the stack stands on the hot exchanger in the section below, through the hot joint's flat ring; the ambient exchanger sits on the stack; an 8.4 spacer runs from the exchanger to the Type B gasket lip at the top face. Nothing is welded inside.\n- The length is set so the column fits exactly: stack + 10 + 9.8 + 0.55 − 1.7. The ambient exchanger then sits 10.35–20.35 below the top face, so the 14 mm water jacket clamps over it at 9.35 mm from the face, clear of the joint's clamp.\n- Spec line: '2 in × L mm clamp × clamp spool, tube Ø50.8 × 1.65, two standard 2 in ferrules'. The lower end runs at the hot exchanger's temperature: the builder checks the spool, the ring and the clamp at that temperature.\n\nspool  face_to_face_mm  stack  stack_mm  ambient_exchanger_mm  end_spacer_mm  jacket_from_lower_face_mm\nspool-2in-48.65mm  48.64999999999999  stack-spiral-2in-30-g1.0  30  10.0  9.8  25.3\nspool-2in-58.65mm  58.64999999999999  stack-spiral-2in-40-g1.0  40  10.0  9.8  35.3\nspool-2in-68.65mm  68.64999999999999  stack-spiral-2in-50-g1.0  50  10.0  9.8  45.3\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO (via iTeh sample): ISO 2852 clamp liners: face profile and flange / groove diameters — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf\n- ASME: BPE Bioprocessing Equipment (tube OD and wall, clamp fittings) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment\n- Xem Studio: tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages — code — CC BY 4.0 — https://xemstudio.com/\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/index.json\nAPI: https://xemstudio.com/api/geometry?object=thermoacoustic-stack-section-spools\n",
 "sources": [
  {
   "publisher": "ISO (via iTeh sample)",
   "title": "ISO 2852 clamp liners: face profile and flange / groove diameters",
   "url": "https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf",
   "formats": [
    "PDF"
   ],
   "license": "standard excerpt; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "BPE Bioprocessing Equipment (tube OD and wall, clamp fittings)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Xem Studio",
   "title": "tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages",
   "url": "https://xemstudio.com/",
   "formats": [
    "code"
   ],
   "license": "CC BY 4.0",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "list-ta-modular-free-piston-2in",
  "thermoacoustic-stack",
  "thermoacoustic-heat-exchanger",
  "thermoacoustic-bore-spacer",
  "thermoacoustic-water-jacket",
  "tri-clamp-custom-length-spools"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [
  {
   "feature": "faces",
   "exact": "ISO 2852 2 in, both ends (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back)",
   "mates": "J1: flat hot ring + high-pressure clamp; J2: Type B gasket + high-pressure clamp",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "bore",
   "exact": "Ø47.5 × face to face",
   "mates": "stack, ambient exchanger disc and 8.4 end spacer",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "tube outside",
   "exact": "Ø50.8 between the ferrule hubs",
   "mates": "water jacket and spool hanger bores Ø50.8",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "length",
   "exact": "48.65 / 58.65 / 68.65",
   "mates": "stack + 10 + 8.4 + 1.95 − 1.7: the column fits to the J2 gasket lip",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "Can I order these?",
   "a": "Yes: plain 2 in tube on two standard ferrules, cut to the length in the table."
  },
  {
   "q": "Why three lengths?",
   "a": "One per stack length on this site (30, 40, 50 mm spiral stacks). A shorter stack gives more power and less efficiency (the modular engine's page compares them)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "spool-2in-48.65mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-48.65mm.step",
   "stl": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-48.65mm.stl",
   "note": "2 in × 48.65 mm clamp × clamp spool, ISO 2852 faces both ends, Ø47.5 bore: the stack section for a 30 mm stack (stack-spiral-2in-30-g1.0), the ambient exchanger and the 9.8 end spacer"
  },
  {
   "file": "spool-2in-58.65mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-58.65mm.step",
   "stl": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-58.65mm.stl",
   "note": "2 in × 58.65 mm clamp × clamp spool, ISO 2852 faces both ends, Ø47.5 bore: the stack section for a 40 mm stack (stack-spiral-2in-40-g1.0), the ambient exchanger and the 9.8 end spacer"
  },
  {
   "file": "spool-2in-68.65mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-68.65mm.step",
   "stl": "https://xemstudio.com/files/hardware/thermoacoustic-stack-section-spools/spool-2in-68.65mm.stl",
   "note": "2 in × 68.65 mm clamp × clamp spool, ISO 2852 faces both ends, Ø47.5 bore: the stack section for a 50 mm stack (stack-spiral-2in-50-g1.0), the ambient exchanger and the 9.8 end spacer"
  }
 ],
 "markdown": "https://xemstudio.com/objects/thermoacoustic-stack-section-spools/index.md"
}