3" 15,000 PSI Fig 1502 Tapped Female Blind Sub with 1/2" NPT – Oil & Gas Flowline Fitting

The 3" Figure 1502 Tapped Female Blind Sub with a 1/2" NPT port is a specialized, high-pressure closure fitting engineered to cap off and safely isolate the male end of a hammer union connection while providing critical access for instrumentation. Rated for a Cold Working Pressure (CWP) of 15,000 PSI, this heavy-duty blind sub is utilized in demanding oilfield applications such as well testing, hydraulic fracturing, and flowback operations where real-time pressure monitoring or controlled bleed-off is required.

Manufactured from premium forged alloy steel, this female blind features the standard Figure 1502 heavy-duty Acme threaded hub. The precision-machined 1/2" National Pipe Thread (NPT) tap located in the center of the cap allows operators to install pressure gauges, transducers, or needle valves directly into the dead-ended section of the flowline. This critical feature enables rig crews to monitor trapped pressure or safely vent hazardous gases and fluids prior to breaking the hammer union connection.

Designed for uncompromising safety and operational flexibility, the 3" 1502 Tapped Female Blind Sub ensures robust fluid containment and structural integrity while simplifying high-pressure manifold management.

Features & Benefits

• Integrated 1/2" NPT Tap: Provides a secure, threaded port for pressure monitoring gauges, sampling equipment, or bleed-off valves.

• 15,000 PSI CWP Rating: Specifically engineered to safely handle extreme pressures in critical well-control and stimulation environments.

• Forged Alloy Steel Construction: Delivers exceptional structural strength, resisting fatigue, mechanical impact, and internal erosion.

• Threaded Female Hub: Features precision-machined Acme threads to seamlessly accept a standard 3" Fig 1502 wing nut and mate with male subs.

• Safe Depressurization: Allows operators to bleed off trapped line pressure before disassembly, preventing hazardous blowouts.

• Standard Interchangeability: Fully compatible with all industry-standard 3" Figure 1502 male subs and wing nut assemblies.

Specifications & Technical Details

Applications

This 3" tapped female blind sub is essential for operations requiring secure high-pressure flowline termination with instrumentation access. Typical uses include dead-ending branches on frac manifolds while monitoring pressure, installing bleed-off valves on well-testing lines, and providing sampling or sensor ports on high-pressure pump discharge headers.

Quality Assurance

Each tapped female blind sub is manufactured under rigorous quality control protocols. The threaded port and main body undergo precise dimensional inspection, thread gauging, and non-destructive examination (NDE) to guarantee absolute structural integrity and reliable blowout-proof performance under maximum 15,000 PSI operational loads.

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