Union holder specifications
All sizes are available with threaded or welded inlets in combination with threaded, welded or muffled outlets.
The SRA Union holder is designed for the SRA rupture disc, and the 30° light-lip Union holder is designed for standard and composite rupture discs.
Any combination of welded or threaded inlet and outlet connections is available. All parts are available in carbon steel or 316 SS. The units are designed with 30° angular seating.
Union holders and flow-direction tags
As a standard, rupture discs for use in Union-type holders are shipped with a detached tag, which should be affixed to the completed assembly when the rupture disc is installed. Under certain circumstances, such an installation may comply with the ASME code.
For those requiring ASME compliance or simple, positive identification of rupture disc installations, we offer a special Union-type holder that allows the installation of a rupture disc with a permanently attached 3-dimensional flow-direction tag. The 3-D flow tag extends beyond the holder for easier verification of orientation after the rupture disc has been installed.
When ordering rupture discs, please state if the disc is to be installed in a Union holder and whether you require the standard configuration or a permanently attached 3-D flow tag.
Nominal Size Range: 0.5″ – 2″ (13 mm – 50 mm)
Burst Pressure Range: 7 psig – 6,000 psig (0,483 barg – 413 barg)
Recommended Operating Ratio: 70 – 90% of the rupture disc’s rated (stamped) burst pressure
Seating Configuration: 30° seat or flat seat (depending on Union or SRA Union holder)
Service: Liquid or gas
BDI Alarm System Compatible?: No
ASME Code Symbol Stamp Available?: Yes