SRJ Pipe Coupling

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Weldless pipe connector

Page last modified
April 11 2024

SRJ Weld-free Pipe Coupling solves many of the problems commonly associated with welded and flanged joints in process piping. It is weld-free, lightweight, quick to install, and provides a high integrity connection. It can be used as a temporary or permanent solution in both new lay and established pipework.

Time and cost of installation: substantial amount of process and labour costs can be saved by negating welding and weld-related activities.

Minimum maintenance: bolt-free design demands no fabric maintenance or bolt retorquing.

Practicality: allows for multiple dis-assemblies and re-assemblies over its lifetime.

Speed: up to 90% faster to assemble and disassemble a spool vs a flanged connection.

Lightweight: one SRJ Coupling is circa 30% lighter than the two comparative bolted flanges.

Compact design: significant space savings compared to a flanged connection

Pros & Limitations
Requires no welding, no PWHT (post-welding heat treatment), no NDT (non-destructive testing)
No bolts - minimal maintenance | No welding
Weighs less and takes up less space than conventional flanges
Available in multiple configurations (pipe to pipe, pipe to flange, blind end, reducer, etc.)
Easy to remove and reinstall (up to 90% faster compared to flanged connection)
Prevents ingress of external impurities
Not suitable for systems with pressure pulsation (hammering)
Specification Title Specification Description
SRJ Coupling enables time efficient spool replacement or modular tie in, and rapid equipment change-out (e.g., PSV). Suitable for both Brownfield and Greenfield applications.
Areas of Application
Oil & Gas | Desalination | Mining | Utilities | Shipping | Power Generation
Certifications / licences
Designed in accordance with ASME B31.3 | Fire rated product Type Approved by ABS and Lloyd's Register for hydrocarbon applications
Weighs less than a third of the equivalent flange
Does not introduce added stress to the pipe (unlike ball-grip mechanical couplings)
Carbon Steel as standard; other grades of steel available on request
Pipe diameter
ABS and LR Type Approved for 1.25" to 16" nominal pipe sizes including hydrocarbon service.
Pressure class
Internal seals retain the internal pressure of the pipe | Energised once the pipe is under pressure | Suitable for a range of pipe media | Replaceable | Available with localised reverse pressure testing functionality
Multiple configurations to address different piping system needs (pipe to pipe, pipe to flange, blind end, reducer, etc)
Prevents ingress of external impurities | Protects retaining wires by blocking access to the internal bore of the coupling


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SRJ delivers weld-free pipe repair and replacement solutions, bespoke EPRS tools and specialised engineering services, helping asset owners and operators improve safety, increase operational efficiency, and enable proactive and cost-effective approach to Asset Integrity Management.

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