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
 | 
| Hersteller |  | 
 
Datenblatt: 
            Alle Funktionen und technischen Daten können ohne Ankündigung geändert werden, Lieferung vorbehaltlich Verfügbarkeit,Korrektur von Irrtümern und Auslassungen vorbehalten.