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Petersen® Inflatable Line Stop™ (ILS™) Systems

Time and cost can be reduced considerably and safety improved by using Petersen® Inflatable Line Stop (ILS) systems block pressurized pipelines. Call Petersen or email to discuss the benefits.
  • Safety enhanced and Environmental Risk reduced with smaller hot tap hole to help maintain pipeline integrity
  • Conforms to out of round pipe configurations for better seal than mechanical stops
  • Time and Cost reduced with smaller lighter weight equipment allows and faster deployment
  • High flexibility, small deflated diameter allows installation through much smaller hot tap than much heavier costlier mechanical stops.
  • Heavyweight Ballistic Nylon reinforced Polyurethane construction for long term reuse Materials such as Kevlar and Viton available for most pressure, chemical, and temperature requirements
  • A minimal inflation pressure with water, air or other inert gas will expand the plug thus most of the pressure is applied to pipe ID for sealing.
  • IFS Insertion Systems may be used with multiple plug and pipe sizes.

Use the Inflatable Line Stop Configurator to estimate dimensions and cost


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Inflatable Line Stop

The 128-Series Hot Tap Pipe Plug Insertion System uses the 128-Series Multi-Flex® Plugs and requires and directs the Plug down stream from the tap. The hot tap may also be used as a by-pass or for purging up stream of the Plug. The tap hole is smaller than for the 129-Series system, the head pressures that may be stopped somewhat lower, and the launch cylinder a little longer. General 128-Series system instructions are available to be adapted for your project.

The 129-Series Hot Tap Pipe Plug Insertion System uses the 129-Series Multi-Flex® Plug and can be customized for higher pressures than the 128-Series system. This Plug inserts a little easier since the Plug is inflated just below the hot tap. The 129-Series system requires a larger tap hole, but can be inserted with a shorter launch cylinder. The 129-Series Plug may also be installed through a riser with an end inflation port when the plug is installed down stream of the riser. General 129-Series system instructions are available to be adapted for your project.

Compact Plug Diameter Allows Insertion Through Small Hot (Live) Tap
Launch cylinder with inflation ram and packing seal (gland) allows insertion of Petersen® Plugs into pressurized pipeline.
Typically used for plugging of pipelines through a hot tap in the side of the pipe or through a valve on the end of a pipe. A variety of Petersen® Multi-Flex® Plugs are available for most chemical, pressure, and temperature requirements. A 36" Plug as an example may be installed through a 10" tap with the pipeline pressurized.
Rotating Elbow
The Rotating Elbow provides a flexible connection between the inflation ram and plug.

128-Series Insertion Systems
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The above lengths are calculated with estimated valve heights and may be adjusted for a specific job requirement.
150 lb. Flanges are standard but the system may be customized for a specific job requirement.
The above pricing does not include the Rotating Elbow.

129-Series Insertion Systems
Click an Item Number below to order


The above lengths are calculated with estimated valve heights and may be adjusted for a specific job requirement.
150 lb. Flanges are standard but the system may be customized for a specific job requirement.
The above pricing does not include the Rotating Elbow.

Launch Cylinders
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Inflation Ram Sections
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System Includes: Launch cylinder, inflation packing seal (gland), inflation ram, centering guide, and drain/fill valve.

Rotating Elbows
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**Inflatable Plug Warning: Maximum head pressures that a pipe plug may restrain can only be estimated. Slippage is influenced by many factors including fluid in the pipe, coefficient of pipeline friction, pressure required to inflate the plug, and accuracy of pressure gauges. Generally, a Multi-Flex® Inflatable Plug inserted fully into pipeline will begin slipping between 50% and 80% of the inflation pressure if it has an inflated pipe contact length of 1 Ω to 2 times the diameter, but even a head pressure of 50% of the inflation pressure may cause slippage with some liquids. The inflation pressure is also subject to temperature change and debris or protrusions in the pipeline that could rupture the plug. The inflation pressure should be monitored and plugs anchored and/or mechanically blocked when slippage could cause property damage or injury. NEVER use a test pressure greater than the capacity of the weakest pipe or component in the system. NEVER use an inflatable plug when its failure could cause injury.

Price subject to change without notice

Petersen Terms & Conditions Apply

Products covered by one or more of the following patents: 4,565,222; 5,353,842; 5,901,752; 6,446,669; 6,568,429; 6,899,138 and other applications pending.

Warning: All pipe plugs must be blocked or anchored adequately against a force equal to the head pressure times the cross-sectional area of the pipe. Debris or protrusions in the pipeline can damage a seal or rupture inflatable plugs. NEVER use an inflatable plug when its failure could cause injury or catastrophic damage or as the only means of protection for personnel working downstream. NEVER use a test pressure greater than the capacity of the weakest pipe or component in the system. Actual conditions vary so user must accept full risk and responsibility for the selection and use of any product. Please review our Warranty, Terms and Conditions.

Note 1: Mechanical and Molded Rubber Plugs are generally used for testing because fabricated Multi-Flex® style plugs may allow some seepage unless customized for a positive seal.

Note 2: We are constantly upgrading our products and while we try to keep the websites up to date it is possible more current specifications may be on a quote or confirming order. Images are typically representative and may not be an exact representation especially of the item size.

Petersen Warranty, Terms & Conditions Apply

Petersen Website Terms and Conditions

Price subject to change without notice

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