Description

A holding ring assembly is a combination of a holder ring and an orifice plate designed for Ring type joint (RTJ) flanges of ANSI or JPI specifications. The holding ring has a function of holding the orifice plate and also a function as a gasket to prevent leakage of the process fluid. This metallic sealing system is applicable to a fluid of high temperature and high pressure, the pressure tapping system is normally the flange tap type.

Orifice bore type	Concentric square edged orifice Quadrant edged orifice
Flow calculation standards	ISO 5167-1 and 2 2003 AGA-3 ASME MFC-3M and 14M JIS Z 8762 BS 1042
Flange ratings	ANSI class 300, 600, 900 and 1,500 Lb Ring type joint (RTJ)
Pressure taps	Flange taps
Plate thickness	3, 6, 9 and 12 mm
Tab handle	Welded to ring
Holding ring	Riveted to plate Types : Octagonal or oval
Drain and vent hole	Per ASME recommendations Not drilled for orifice bores smaller than 25.4 mm
Markings	Upstream side of tab handle stamped with "Upstream" and with bore type and size, line size, tag number and flange rating
Special markings	Special marking may be furnished to meet Specific requirement
Materials	Plate : 304SS and 316L SS Holding ring : Soft lron, 304SS and 316SS Rivets : 304SS and 316SS Tab Handle : 304SS and 316SS
Manufacturer

Datasheet:

All features and specifications subject to change without notice, delivery subject to availability, correction of errors and omissions excepted.