Sigma 813509619 Ground Joint Pipe Union 3 Inch 150 Lb

Product Description

The SIGMA 813509619 is a FIG 3463 ground joint pipe union rated at 150 lb, designed for use in threaded pipe systems where periodic disconnection and reconnection of pipe runs is required. The union features a female national pipe taper (FNPT) end style on a 3-inch nominal size, constructed from malleable iron with a galvanized finish for corrosion resistance. The ground joint seat provides a metal-to-metal seal that maintains integrity under pressure. This fitting is installed by licensed plumbers and pipefitters in commercial and industrial piping systems.

This union is suited for use in low-pressure water, air, and gas distribution piping where a break-apart connection point is needed. The galvanized malleable iron construction makes it appropriate for exposed or damp environments where bare iron would be prone to surface corrosion. The 3-inch nominal size fits standard schedule pipe in commercial mechanical rooms, utility piping, and above-grade plumbing distribution lines. It is a direct threaded installation with no special tooling beyond a pipe wrench and thread sealant.

Key Features

• Ground joint metal-to-metal seat for reliable pressure seal at threaded unions
• 3-inch nominal FNPT connections for standard threaded pipe assembly
• 150 lb pressure rating suitable for low-pressure piping applications
• Malleable iron construction offers impact resistance over cast iron
• Galvanized finish provides corrosion protection in damp or exposed installations

Compatibility

Designed as an OEM-style replacement fitting for 3-inch nominal threaded malleable iron pipe systems rated at 150 lb working pressure.

Installation Notes

Installation of this union should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or local mechanical codes. Shut off and depressurize the pipe system fully before disassembling or installing any union fitting. Apply an approved pipe thread sealant or PTFE tape to all male threads before assembly. Do not over-tighten the union nut, as this can damage the ground joint seating surface and compromise the seal.

Technical Specifications

• Figure Number: FIG 3463
• Nominal Size: 3 inches
• End Style: FNPT
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 813509619