Instrument Tees

Instrument tees are one of the few wafer fittings in a pipeline system, providing the functionality of a flanged equal or reducing tee without the bulk. Their primary use is for the insertion of instrumentation into the flow stream or used in conjunction with valves as drains for pipelines.

Instrument tees are not included in ASME B16.5, so the dimensions below are specific to CRP. The centreline to face dimension of the branch is to ASME B16.5 for the nominal bore of the body but the body face to face is determined by the diameter of the branch nominal bore. The body diameter is sized to fit neatly inside the inner bolt circle of the mating flanges.

The dimensions below are to suit ASME B16.5 flanges.

To suit pipework NB				Centre Line -Face A	Face – Face B
Inches	mm	Inches	mm	Centre Line -Face A	Face – Face B
1″	25	1″	25	89	51
1.1/2″	40	1″	25	102	51
1.1/2″	40	1.1/2″	40	102	76
2″	50	1″	25	114	51
2″	50	1.1/2″	40	114	76
2″	50	2″	50	114	89
3″	80	1″	25	140	51
3″	80	1.1/2	40	140	76
3″	80	2″	50	140	89
3″	80	3″	80	140	150
4″	100	1″	25	165	51
4″	100	1.1/2	40	165	76
4″	100	2″ *	50	165	89
6″	150	1″	25	203	51
6″	150	1.1/2″	40	203	76
6″	150	2″	50	203	89
6″	150	3″ *	80	203	150
8″	200	1″	25	229	51
8″	200	1.1/2″	40	229	76
8″	200	2″	50	229	89
8″	200	3″	80	229	150
10″	250	1″	25	279	51
10″	250	1.1/2″	40	279	76
10″	250	2″	50	279	89
12″	300	1″	25	305	51
12″	300	1.1/2″	40	305	76
12″	300	2″	50	305	89
12″	300	3″	80	305	150

*As standard these items are supplied with a reduced bore in the branch to allow the branch to fit between the line bolts, please contact our sales office for details.

Instrument tees are a wafer style offering considerable space savings over traditional tees. We supply cast steel bodies for most of the common sizes and fabrications for specials and tees with rotating flanges. We also supply double branch instrument tees / crosses.