/ Hammer Union Seals
2″ Fig 1502 Buna-N Hammer Union Seals with Brass Backup Ring
Our Hammer Union Seals are engineered to provide leak-free performance in Weco® style union connections used in high-pressure flowlines. Manufactured from high-modulus elastomers and reinforced with anti-extrusion backup rings (Brass or Stainless Steel), these seals withstand the extreme pulsating pressures and abrasive fluids found in hydraulic fracturing and cementing operations.
Technical Specifications
- Working Pressure Ratings: 1,000 PSI to 22,500 PSI (depending on union rating)
- Durometer: 80-95 Shore A
Applications
- Hydraulic Fracking: High-pressure sand and proppant injection lines.
- Flowback Operations: Managing post-frac fluids and gases.
- Choke & Kill Manifolds: Safety-critical well control connections.
- Mud Lines: Circulating drilling mud systems.
- Acidizing & Cementing: Handling abrasive cement slurries and acid fluids.
2″ Fig 1502 Buna-N Hammer Union Seals with Brass Backup Ring
1. Executive Summary
The 2-Inch Figure 1502 connection is the single most common connection in the North American oil patch. Maintenance teams rely on our 2″ Buna-N Seals with Brass Backup Rings for reliable Iron Rece rtification.
The key differentiator of this product is the Brass Backup Ring. While stainless steel rings are available, Brass is the preferred industry standard for NBR seals because it acts as a “sacrificial” component. It is soft enough to deform slightly, creating a perfect anti-extrusion barrier even on unions that have suffered minor wear or pitting, without galling the expensive steel sealing face of the union itself.
2. Why Brass? Material Engineering Explained
Anti-Galling Properties
When a Hammer Union is tightened (made-up), significant torque is applied. Steel-on-Steel contact can lead to galling (surface damage).
-
Benefit: Brass provides a lubricious bearing surface. It prevents the seal from binding during installation and protects the metal sub from scratches, extending the lifespan of your flowline iron.
Conformability Under Load
Brass has a lower yield strength than steel. At 15,000 PSI, the brass ring expands radially to close the extrusion gap more effectively than harder metals, ensuring a tighter seal on older, used equipment often found in rental fleets.
3. Extended Parameter Table
| Parameter | Value | Notes |
| Nominal Pipe Size | 2 Inch | Fits 2″ bores |
| Union Compatibility | Fig 1502 (15K) & Fig 1002 (10K) | Universal Fit |
| Part Number Reference | Comparable to P/N 55555 (Generic Ref) | – |
| Elastomer Material | Buna-N (Nitrile) | High Acrylonitrile Content |
| Reinforcement | CDA 360 / 464 Naval Brass | Anti-Extrusion Ring |
| Pressure Rating | 15,000 PSI CWP | Standard |
| Specific Gravity | 1.25 ± 0.05 g/cm³ | – |
| Modulus @ 100% | > 1,500 PSI | Indicates stiffness |
| Fluid Resistance | Water, Hydraulic Oil, Diesel, Mud | No H2S / No Acids |
| Shelf Life | 15 Years (per ARP 5316) | Store away from UV |
4. Ideal Usage Scenarios (MRO Focus)
-
Iron Recertification Centers: Replacement seals for testing and refurbishing flowline iron.
-
Coil Tubing Units: Reel-to-injector connections.
-
Nitrogen Pumping Units: Standard service N2 injection lines.