Dosch - Orifice Flanges with Orifice Plates

Orifice flanges are specially manufactured for the differential pressure flow measurement. The pressure tap bore holes are located at a specific distance (25,5 mm) in front of/ behind the orifice plate. We deliver them completely mounted with screws and gaskets.

Standard orifice flanges according to ASME B16.36 are manufactured with two pressure taps Yt NPT-F per flange which can be closed with plugs. The taps are positioned in a 180° angle to each other. Available jack screws help to mount or remove the orifice plate on site when the flanges are already welded to their final position.

Other standards (e.g. DIN 19214, NORSOK, JIS) are available as well. The weld-end pipe dimensions are defined by the customer and standards. More details regarding orifice plates are described in our separate brochure E91N.

DN 10 to DN 500 (DIN) /1" to 24" (ASME), special dimensions are available on request

PN 10 to 400 (DIN) / 300# to 2500# (ASME), other pressure ratings upon request

according to EN 1092-1:

• flat (Form B1 and B2)
• groove (Form D)
• female (Form E)

according to AS ME B16.5:

• flat (RF and SF)
• groove (small/large)
• female (small/large)
• RTJ female

or according to other flange standards specified by the customer.