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2 in end cap with a 1/2 NPT transfer boss, two 1/4 NPT bosses and a spigot (transfer cap)

Name: 2 in end cap with a 1/2 NPT transfer boss, two 1/4 NPT bosses and a spigot (transfer cap) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I join two tri-clamp cylinders with a short gas passage? · Hardware · basis: ISO 2852 2 in face as on this site; 1/2 and 1/4 NPT per ASME B1.20.1; passages and spigot are design values

Long Earth Society build part. The transfer caps of my horizontal gamma. 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: 5 in table

Notes

A fabrication spec: a solid 2 in end cap with a 1/2 NPT boss on its side, two 1/4 NPT bosses and a spigot that fills the joint's dead space. Two of them, on two cylinders 120 mm apart with their transfer bosses facing, join with two 1/2 NPT × 1/2 in tube fittings and a 64 mm length of 1/2 in tube: the gamma's transfer passage.
Gas path: spigot face → Ø11 axial passage (off-centre) → the 1/2 NPT port → fitting → tube (bore 10.9). Volume of the whole transfer path about 22.2 mL; its friction is in the engine's numbers.
The rod-gland version carries the displacer rod in two 6 × 10 × 10 sleeve bushings 46 mm apart. The NPT bosses take the working space's fill valve, gauge, relief valve and a plug.

Sizes

feature	value
face	ISO 2852 2 in
spigot	Ø44.0 to 3.15 past the face
transfer boss	1/2 NPT, Ø30, face 28 from the axis, z 24
NPT	2 × 1/4 at z 24, y 13, ±X
gland	Ø10 seat z 30–86 (rod version)

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
face	ISO 2852 2 in	Type B gasket, 2 in clamp	clamp	all
spigot	Ø44.0 to 3.15 past the face	inside the gasket lip Ø45.3 (no contact)	designed	all
transfer boss	1/2-14 NPT, tap drill Ø18.3 × 14	1/2 NPT × 1/2 in tube fitting	designed	all
port bosses	2 × 1/4-18 NPT, tap drill Ø11.1 × 12	gauge, relief valve, fill valve, plug	designed	all
gland seat	Ø10, z 30–86	two 6 × 10 × 10 sleeve bushings	press	transfer-cap-2in-rod6*

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 (clamp fitting dimensions, tube OD and wall)	standard	ASME; dimensions are facts verify
ASME	ASME B1.20.1 Pipe Threads, General Purpose, Inch (NPT): 1/4-18 major Ø13.72, tap drill 7/16 in (11.1), L2 10.2	standard	ASME; dimensions are facts verify
Long Earth Society	Engine builds	web, video	LES site

Free files

★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

transfer-cap-2in-rod6	2 in transfer cap with rod gland: ISO 2852 face, body Ø50.8 × 40, spigot Ø44 to 3.15 past the face, Ø11 axial passage at y 13, 1/2 NPT transfer boss (+Y, face 28 from the axis, z 24), two 1/4 NPT bosses (±X, z 24), Ø10 seat z 30–86 for two 6 × 10 × 10 bushings	STEP · STL
transfer-cap-2in-blind	2 in transfer cap, blind: as the rod-gland cap without the gland boss	STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-transfer-cap