Design

1. Integrated Flow Design
   BL-3T threads are machined directly onto pipe ends, delivering fully flush joints matching the pipe body.
2. External Torque Shoulder

• The negative-angle torque shoulder provides torque stop and reinforces the outer sealing surface.
• It also defines the exact make-up position.

1. Multi-Seal System

• Independent internal and external seals provide sealing for both inner and outer pipe sides.
• The multi-seal design ensures performance consistent with pipe body yield strength.

1. Hook Thread

• Tensile load capacity exceeds 60% of pipe body strength.
• 45° thread lead angle facilitates easy make-up and avoids cross-threading for convenient field operation.
• -15% load flank prevents pipe separation.
• Maintains reliable sealing under bending loads.

1. Flow Optimized Design

• Flush ID & OD (non-upset).
• Smooth inner bore.
• Tighter inner diameter tolerance.

Main Applications
Deep & ultra-deep wells, narrow clearance cementing, well workover operations