OD Mounted Pipe Test Plugs — EST GripTight

OD GripTight test plugs seal and grip around the outside of an open pipe or tube end. This differs from an ID-sealing plug: pipes with the same outside diameter may share an OD plug across several wall schedules, provided all dimensional and pressure requirements are met.

Pipe and tube size ranges

• Nominal pipe range: 1/4–4 inches (DN8–DN100).
• Published tube range: 1/2–3-1/2 inch outside diameter (12.7–88.9 mm).
• Metric and other requirements can be reviewed with Justram.
• Maximum published pressure: up to 5,000 psig (approximately 345 barg), subject to the exact plug and pipe.

Nominal pipe size and measured tube OD are different sizing conventions. Provide the actual outside diameter and wall thickness, and check the selected plug’s OD tolerance and minimum engagement length.

Construction and seal compatibility

The plug uses an aluminium body, hardened grippers and a dual-seal arrangement. The manufacturer’s current standard is urethane with a fluoroelastomer O-ring. Identify the existing plug and service conditions when ordering replacement seals; older assemblies should be checked before assuming the same components.

Technical selection and installation

Use the OD GripTight DC8051 technical specifications (PDF) for the part-specific pressure limit, engagement dimensions, outlet and replacement components.

Provide pipe material, surface condition, required test pressure, medium, temperature and end-access dimensions. Follow the applicable manufacturer procedure for preparation, tightening, restraints, venting and depressurization. The complete test system must remain within its component ratings.

Compare sealing arrangements

For an internal sealing arrangement, compare GripTight MAX test plugs. Request an OD GripTight quotation with the pipe or tube dimensions and test requirements.