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High Pressure · Patented GripSafe® Technology

GripSafe® ST Hydrostatic Test & Isolation Plugs

Cut plant downtime. GripSafe® ST plugs hydrotest and isolate pipe without welding or cutting end caps. Self-gripping wedges, Gritlock® surfaces, and Tri-Ply® seals hold full test pressure with virtually no marks on the pipe.

10,000PSI Max Test Pressure*

3/4"–48"Pipe Sizes

9 YearsProven in the Field

Rentor Buy

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*Pressure ratings vary by model, size, and schedule. See each product's size chart.

GripSafe ST hydrostatic test and isolation pipe plug animation

The GripSafe® Line

Choose Your GripSafe® Plug

Four designs for open-ended pipe, weld testing, reverse pressure, and large bore lines.

GSST ORB

Hydrotest open-ended pipe, spools, and vessels. Grips on insertion.

Sizes: 3/4" – 36"
Pressure: Up to 10,000 psi

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Double Block & Bleed

GSST DBB

Test flange-to-pipe welds between the seals, or prove a double block & bleed isolation holds.

Sizes: 3/4" – 36"
Pressure: Up to 10,000 psi

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Inboard Insertion Blocking

GSST IIB

Reverse pressure. Test flange welds with a ported blind flange, or block vessel outlets.

Sizes: 3/4" – 36"
Pressure: Up to 10,000 psi

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Large Diameter Piping

GripSafe® XL

Large bore hydrostatic and pneumatic testing.

Sizes: 36", 42", 48"
Pressure: Up to 3,000 psi

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Pressure ratings vary by size and schedule. See each product's size chart. Need lifting devices or a Pipe Reinforcement Device? See GripSafe® ST accessories.

Pipe Plug Basics

Isolation & Hydrostatic Test Plugs

Pipe plugs are classified as pipe fittings because of the job they do inside the piping system. Hydrostatic testing is a critical quality step during construction, maintenance, and repairs that confirms compliance with industry standards and regulations.

Isolation PlugsCreate a temporary seal that blocks fluids or gases from an isolated section, so maintenance can happen without shutting down the entire system.

Hydrostatic Test PlugsHold test pressure in pipelines, valves, and pressure-containing components to find leaks, weaknesses, or defects before they become costly failures.

Safeguard WorkersNo hot work, no fumes, no burns. Plugs install cold.

Preserve AssetsGritlock® wedges leave virtually no marks, so spools go back into service.

"GripSafe plugs have been valuable assets on the LNGC site. The quick and easy installation, use, and removal of the plugs have made testing plain end pipe simple. The Lifting Device makes rigging of the larger plugs into position fast, convenient, and safe. The design of the grippers leave little to no marks inside the pipe. Torque values and plug info on the front plate makes plug identification and double-checking for the right plug usage easy. Overall, the GripSafe plugs are an excellent product."
T. Read, Hydro Foreman, and S. Daigle · Global EPC Company

USA Industries Pipe Plug Solutions product reference sheet — Pipe Plug Solutions Reference Sheet (PDF)

Independent Lab Testing

GripSafe® ST vs. Competitive Gripping Plugs

SCH 80 plugs in ASTM A106 Grade B pipe, pressurized to 3,246 psi (full hydrotest pressure).

GripSafe® ST

Virtually No Surface Damage

Wedge-grip system holds the pipe wall without scarring it, so the pipe can go back into service.

Competitive Plugs A & B

Heavier ID Surface Damage

Serrated jaw grippers bite into the pipe, which can mean rework or temporary piping.

"...the contact of the competitive isolation plugs resulted in heavier ID surface damage than the GripSafe isolation plugs."
Anderson & Associates · Consulting Metallurgical Engineers and Testing Lab

View the Full Test Report (PDF)

Pressure Testing Solutions

Test Plugs vs. Welding End Caps

Plugs deliver faster turnarounds, lower costs, better safety, and more flexibility than welding end caps on pipe spools.

GSST Test PlugsWelded End Caps

SpeedInstalls in minutes with no hot work, ready to test right awayWeld, cool, test, then grind off. Hours per cycle

CostReusable. No welders, consumables, grinding, or NDESingle-use caps, welder labor, consumables, and inspections

SafetyNo hot work permits, arc flash, fumes, or burnsOpen flame and hot metal. Permits, fire watch, and PPE required

FlexibilityReposition and reuse across pipe sizes and test setupsPermanently welded. Changes mean cutting off and starting over

Pipe QualityNo heat-affected zone. Low risk of contamination or distortionHeat-affected zones, possible distortion, post-weld NDE

The Bottom LineIsolation and test plugs transform pressure testing from a bottleneck into a streamlined operation, delivering speed, savings, safety, and flexibility that welding end caps simply cannot match.

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