Unions

Unions for Fire Pipe Networks

Unions provide a demountable joint at a planned point in fire water pipework. Their multipart arrangement can support local assembly or disassembly where the approved design calls for a union, without treating the entire adjacent pipe run as one permanent connection.

The product name does not establish thread form, connection size, material, sealing method, pressure capability or installation orientation. A union must match both connected sides and the service specification. Coordination is especially important where it sits close to a valve, hose reel assembly or other component that may require future access.

Key Features and System Role

• Creates a planned local disconnection point within a compatible pipe assembly.
• Supports connection between adjoining pipework or equipment when a union joint is documented.
• Keeps the joint area accessible for assembly, visual examination and maintenance coordination.
• Allows exact connection and sealing details to be matched to the project rather than assumed.

Typical Applications

Unions may be used around valve arrangements, equipment connections, hose reel pipework and service sections where the drawings identify a demountable joint. Adequate working clearance should be provided so the joint can be assembled and inspected without loading nearby pipework or obstructing other fire protection components.

Specification and Project Coordination

Confirm connection size and form, union pattern, material or grade, sealing arrangement, finish, documented rating and compatibility with adjoining components. Do not infer a thread standard, pressure class or included sealing part from the generic name. Supplier data and approved project documents should resolve each requirement before supply.

Installation, Inspection and Maintenance

Check all union parts and sealing surfaces for damage, contamination and correct compatibility. Assemble without cross-connection or unintended pipe strain, then complete the project-specified inspection and test. Routine maintenance should review the joint for leakage, damage, loosening, corrosion and continued accessibility before any disassembly is attempted.

Explore Fire Pipe Network Solutions

For supply support and project coordination, contact AJ Safety Solutions. Review the complete Fire Pipe Network product range and coordinate this item with related fire valves where required by the approved system design.

Reference Standards

Project teams may consult NFPA 14 for the applicable standpipe and hose system framework and NFPA 25 for inspection, testing and maintenance context. The project specification and authority having jurisdiction determine the applicable requirements.