Union Holder Assembly

Our line of Union holder assemblies provides flexibility in tight piping configurations. These precisely built holders combine remarkable ease of installation with high-pressure ratings in pipe sizes of 2″ (50mm) or less.

The Union holder assembly works with standard- or composite-type rupture discs. SRA Union and Union-type holders are available for pressure ranges up to 6,000 psig, depending on disc size and type.

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

Industry Applications

Industrial Gases
Industrial Gases
Industrial Gases

Size, pressure, versatility, pressure, corrosion resistance and tight seals – the needs of the industrial gas industry are diverse, and we have the vast experience necessary to customize solutions to match your needs. Designs and materials to minimize ice buildup, intergranular corrosion, embrittlement or leakage are readily available.

Oil, Gas & Petrochemical)
Oil & Gas (Petrochemical)
Oil & Gas (Petrochemical)

The hydrocarbon industries require cost-effective system protection with a special focus on reducing fugitive emissions. Our catalog of configurations, materials, burst ratings and sizes make our rupture discs the right choice for these operations.

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