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
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.