The Revolutionary New Test Plug for Hardened Pipe, Non-Metallic Pipe, and Higher Test Pressures

Technical Brief – EST Group


EST Group’s GripTight MAX Test Plug is a revolutionary new plug design which significantly increases the range of pipe materials and pressures that can be tested.  It is highly effective in applications such as down hole / well-head piping, high pressure steam systems and in the replacement of older piping with newer high alloy hardened pipe materials used in refineries and chemical plants.  It is also effective for testing non-metallic materials such as Fiberglass Reinforced Plastic (FRP) and Glass Reinforced Epoxy (GRE) piping systems.

Basic operations

• Similar to standard GripTight® plugs, GripTight MAX plugs are inserted into the pipe, (with recommended vents) and tightened to manufacturer’s specifications.

• The patent-pending design of the dual serrated grippers provides additional gripping points around the pipe wall to provide the strength necessary to secure the plug to meet the higher test pressure requirements.

• As the pressure increases the seal and grippers are energized. This provides the additional sealing necessary to prevent leakage. Thus as with all GripTight designs, the greater the pressure, the greater the grip!

Features and BeneFits

• Patent-pending dual-serrated gripper design provides more gripping points on inside pipe surfaces

• Test pressures to 15000 PsiG (1030 BarG) • New hardened shaft increases durability, plug life and reduces wear

• Stocked sizes for NPS ranging from 1” to 8” (DN25 – DN200), larger sizes up to 24” (DN 600) available on request

• Safe and reliable testing at higher pressures

• Effective for testing non-metallic pipe such as FRP and GRE

• Facilitates testing in accordance with ASME PCC-2 and ASME Boiler and Pressure Vessel Codes

• Saves over 90% in testing time vs. welded-on end cap testing procedures

See the time savings for yourself  and the reduction of gripper marks DC2544 GripTight MAX Technical Brief

Significant time and effort is saved when hydrotesting pipe spools, pipe racks and process modules. GripTight MAX eliminates the time consuming process of welding on end caps, then cutting them off and re-machining the pipe end. EST Group’s range of high pressure test plugs offer a fast, safe and reusable solution. GripTight MAX high pressure test plugs use the proven self gripping feature combined with its dual-serrated gripper design to safely, quickly, and effectively test pipe. For example, on the right (Table 1) a comparison is  made for the time and technicians needed to test one typical pipe spool using the GripTight MAX test plugs vs. the conventional welded end cap method.1 The results are significant with almost 108 man hours being saved using the GripTight MAX plug!

Download Technical Information Documents

Griptight Max™ Test Plug PDF
• •GripTight Isolation Plug PDF
• •GripTight ElbowTest Plug PDF

High Lift Flange Weld PDF
Double Block Bleed Isolation Plug PDF
GripTight Reverse Pressure PDF
DC2696 – Pressure Test & Isolation Product Line Guide PDF