4" Figure 1502 Hammer Union Retainer Segments (Set of 3) – Oil & Gas Flowline Part

The 4" Figure 1502 Retainer Segment Set is a high-strength structural component essential for the assembly and pressure-containing integrity of large-bore hammer unions. Designed specifically for the 4-inch Figure 1502 male sub, these three precision-machined segments fit into the machined groove behind the male sub’s sealing face. They create the heavy-duty load-bearing shoulder that the wing nut pulls against, enabling the union to achieve its rated 15,000 PSI seal.

Given the large diameter and the massive axial forces present in 4-inch high-pressure lines, these segments are manufactured from premium-grade forged alloy steel and heat-treated to optimize hardness and fatigue resistance. Because the wing nut must be able to slide onto the pipe during assembly, the shoulder must be "split." This three-piece design allows for easy installation over the flared lip of the male sub, which is then secured by a retainer ring to make the wing nut a captive, rotating component.

Essential for the maintenance and recertification of high-volume flowback iron and frac manifolds, this segment set allows field technicians to rebuild expensive 4-inch swivel joints and pup joints by replacing only the wear-prone mechanical components.

Features & Benefits

• 15,000 PSI CWP Compatibility: Engineered to support the extreme mechanical loads required for 4-inch 15M flowline connections.

• Heavy-Duty Forged Steel: High-tensile material provides maximum resistance to deformation and cracking under intense sledgehammer "make-up" forces.

• Precision Machining: Each segment is machined to exact tolerances to ensure 100% contact within the male sub groove, preventing uneven load distribution.

• Interlocking Set of 3: Provided as a matched set of three 120-degree pieces to form a complete 360-degree high-strength shoulder.

• Severe Service Ready: Built to withstand the high vibration and abrasive environments typical of hydraulic fracturing and high-rate well testing.

• Cost-Efficient Maintenance: Enables the repair of male hammer union ends in the field, extending the service life of large-bore flowline iron.

Specifications & Technical Details

Applications

This 4" Figure 1502 segment set is utilized for the assembly and repair of high-pressure, high-volume hammer union connections. Typical applications include rebuilding 4-inch frac pup joints, securing wing nuts on large-bore style 10 and style 50 swivel joints, and maintaining the primary inlet/outlet connections on high-pressure stimulation and flowback manifolds.

Quality Assurance

Each segment set undergoes rigorous quality control, including non-destructive examination (NDE) and dimensional verification. The metallurgy is tested to ensure it meets the specific hardness requirements necessary to prevent shoulder "rolling" or failure under the maximum 15,000 PSI operational loads encountered in the field.

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