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Tri-clamp spools to a custom length (fabrication spec): 2 in × 340.7 and 310.7 mm, ¾ in × 146.7 and 80.4 mm

Name: Tri-clamp spools to a custom length (fabrication spec): 2 in × 340.7 and 310.7 mm, ¾ in × 146.7 and 80.4 mm dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I order a tri-clamp spool in a length that isn't 3, 6 or 12 inches? · Hardware · basis: ASME BPE tube (2 in: Ø50.8 × 1.65; ¾ in: Ø19.05 × 1.65) and ISO 2852 ferrule faces exactly as the standard spools on this site (gen_sanitary.spool); lengths from the engine layouts in tools/gen_ta_power.py

Long Earth Society build part. Custom spools for my pressurised thermoacoustic engines. 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: 4 in table

Notes

Plain spools: standard tube with a standard ferrule on each end, nothing else, cut to the stated face-to-face length. Any sanitary fabricator makes them from this drawing; a spool is the cheapest custom tri-clamp part there is.
2 in × 340.7: the core of each unit of the double-acting ring engine (two ambient exchangers, 100 mm regenerator, hot exchanger, 180 mm buffer tube, two 8.4 spacers between the gasket lips). 2 in × 310.7: the twin-piston engine's core.
¾ in × 146.7 and × 80.4: the riser pieces of each engine's ¾ in feedback line, between the instrument tee and cross.
Fits: the faces are clamp faces; the 2 in bore Ø47.5 takes the exchanger inserts, screens and liners as a slide fit (Mating features).

Sizes

file	size_in	face_to_face_mm	tube_mm	use
spool-2in-340.7mm	2	340.7	50.8 × 1.65	ring core
spool-2in-310.7mm	2	310.7	50.8 × 1.65	twin core
spool-0.75in-146.7mm	0.75	146.7	19.05 × 1.65	ring riser
spool-0.75in-80.4mm	0.75	80.4	19.05 × 1.65	twin riser

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: land Ø56.5–Ø64; ¾ in: 25.0 flange), rim 2.85, 1.6 recess, 20° back	standard clamp + Type B gasket	clamp	all
2 in bore	Ø47.5 × face to face	exchanger inserts (press), screen discs, spacers and liner (slide)	slide	spool-2in-*
¾ in bore	Ø15.75	gas passage (no contact)	designed	spool-0.75in-*

Where the files are

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

ASME	BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)	standard	ASME; dimensions are facts verify
ISO (via iTeh sample)	ISO 2852 clamp liners: face profile and flange / groove diameters	PDF	standard excerpt; dimensions are facts
Long Earth Society	Engine builds	web, video	LES site

Free files

★ Free files 4 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

spool-2in-340.7mm	2 in spool, 340.7 mm face to face, 1.65 wall, ISO 2852 ferrules both ends: the ring engine's core	STEP · STL
spool-2in-310.7mm	2 in spool, 310.7 mm face to face: the twin-piston engine's core	STEP · STL
spool-0.75in-146.7mm	¾ in spool, 146.7 mm face to face (25.0 flange): ring-engine riser	STEP · STL
spool-0.75in-80.4mm	¾ in spool, 80.4 mm face to face: twin-engine riser	STEP · STL