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Tri-clamp thermal-break spacer, 2 in × 25.4 mm: an insulating section with its own two clamp faces

Name: Tri-clamp thermal-break spacer, 2 in × 25.4 mm: an insulating section with its own two clamp faces dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I put a thermal break between two tri-clamp sections? · Hardware · basis: Design values; faces from the shared ISO 2852 ferrule profile (gen_hardware.tc_spool); conduction estimates are mine (assumptions stated)

Long Earth Society build part. The optional thermal break of my modular thermoacoustic engine. The engines

Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features

sizes: 1 in table

Notes

Two clamp faces on one short insulating body: clamp it between a warm section and a part that must stay cool (an alternator, a seal, magnets). Each face has its own gasket and clamp, so the heat path through it is only its own wall.
Why not a ring in one joint: every tri-clamp joint already has a gasket between the faces, and the metal path across a joint is the clamp itself, which grips both rims on their 20° cones. A thin insulating ring in a joint adds little; the clamp still bridges it. With the spacer, the two clamps never touch each other.
Where it goes: only where the temperature suits what it is made of. On my modular thermoacoustic engine it can only sit at the cold joint (above the ambient exchanger, at the cooling water's temperature); the hot joint runs at about 550 °C, which an insulating ring rated to about 260 °C cannot take.
What it costs there: its bore adds 27.1 mm of cold gas between the stack and the piston, which lowers the pressure swing per stroke: 4.4 W against 10.2 W at the design point (model). So it is optional on that engine.
Pressure: at a 15 bar gauge relief the hoop stress in a 1.65 wall would be 23 MPa; the builder checks that against what it is made of, at its temperature, and may leave it at 1 bar.

Sizes

part	face_to_face_mm	bore_mm	outside between faces_mm	joints	clamps
break-spacer-2in-25.4	25.4	47.5	50.8	2	2

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.

feature	exact	mates with	fit	files
faces	ISO 2852 2 in, both ends (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back)	Type B gasket + clamp at each face (two clamps, not touching)	clamp	all
bore	Ø47.5	gas passage (no contact)	designed	all
outside between the faces	Ø50.8	clamp room (no contact)	designed	all

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

ISO (via iTeh sample)	ISO 2852 clamp liners: face profile and flange / groove diameters	PDF	standard excerpt; dimensions are facts
ASME	BPE Bioprocessing Equipment (tube OD and wall, clamp fittings)	standard	ASME; dimensions are facts verify
Xem Studio	tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages	code	CC BY 4.0
Long Earth Society	Engine builds	web, video	LES site

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

break-spacer-2in-25.4

2 in × 25.4 mm thermal-break spacer: ISO 2852 faces both ends (the standard ferrule profile), Ø47.5 bore, Ø50.8 between the faces; two clamps, one on each face, so no clamp bridges it

STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-thermal-break-spacer