TAMPI -> Temperature, Application, Medium (flow), Pressure, Inside
Petersen PeteStop™ and Multi-Flex® Plugs and Inflatables are made
from synthetic materials generally with a shelf life many more years
longer than molded rubber plugs. We do not test the final product for
length of life but have anecdotal feedback they have been used for
years before returning for repair, testing, and recertification. Every
project is different so only length of life generalizations are
possible. Please contact Petersen Engineering for details.
It can be installed horizontally or vertically and into a horizontal
or vertical run of pipe It can be installed into unique circumstances
such as ROV, tunnel, or rock
It can be inflated from the end or from the side
It can be lowered into place with a crane or hoist It can be
rolled in on wheels or other device It can be inserted through a hot
It can be inserted through a hole smaller than the pipe size It
can be installed via ROV
Other placement options are available
Water is not compressible so is less dangerous than inflation with
air or another gas. Water is especially preferred for large plugs and
high pressure but it is still a judgement based on what is in the
pipeline and the consequence of a plug failure for any reason.
Yes. We have many options available from hot tap insertions to
We test plugs only for rated size pipeline but understand they are
sometimes used in a smaller diameter pipe. As the size is reduced
there will be more wrinkles in the outer ply so general more seepage
past the plug. This may or may not provide an acceptable block.
Yes. We have many application specific options available. Our very
flexible Multi-FlexTM plugs excel in this application.
The hydrocarbon resistant Multi-Flex® plugs have a 200°F maximum
service temperature and may be modified for up to 400°F.
Multi-Flex® Plugs may be customized for most chemical resistance
requirements. Multi-Flex® plugs have a much higher puncture and tear
resistance than rubber molded Plugs and may be customized with
Kevlar for even greater puncture resistance.
None of our inflatable plugs can withstand 600F and weld splatter
can damage them.
The temperature of the pipe can sometimes be reduced by flooding
the plug area with water.
The splatter can be reduced somewhat by the welding technique, we
can add a Kevlar outer ply, or the plug moved further from the weld
Based on our best information the Kevlar Viton B material used in
manufacturing the 114-0245-KV plug provides resistance to Hydrofluoric
acid. It is still recommended that any product be tested under actual
environment as conditions may vary considerably and we do not have the
facility to perform chemical tests.
NOTE: DO NOT pull on the Inflation hose to remove the
Disconnect the air source and open any valve on the Inflatable
Petersen recommends using a Vacuum Generator to deflate larger
Water Deflation - Disconnect the water source from the Inflatable
Connect the hose to the water outlet.
Verify that the water outlet hose drains into a tank or area
that can collect the drained water.
Monitor and track the output as needed. Removing the Plug
Carefully remove the Inflatable Plug only after it is completely
Safety is our top priority. 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.
The maximum pipeline head pressure is generally 50% of the plug
maximum inflation pressure. It can vary based on actual pipeline
conditions and the product being blocked.
The head pressure is considered the maximum differential pressure up
and down stream of the plug. If the pressure is 100 psi up stream and
50 psi downstream of the plug, the head pressure is 50 psi. With a
120”WC vacuum (4.33 psi) on one side of the plug and no vacuum or
pressure on the opposite side of the plug, the head pressure is 4.33
The plug is used where there is a small opening for inserting a plug
and/or when greater pressure, chemical, and temperature
characteristics are desired.
Our Multi-Flex plugs such as the 113 to 127 series plugs have the
highest minimum to maximum size ratio in the industry but the fabric
reinforced outer ply develops wrinkles as the pipe diameter reduces
thus allowing more seepage past the plug. They can be customized for
testing a specific size but a mechanical or rubber plug if more
typical for testing.
The Mechanical and Molder Rubber plugs create the best seal for
The standard Multi-Flex plugs may allow some seepage but generally
create an acceptable seal, though typically not for pipeline
The MultiFlex plugs may be customized at extra cost with an
enhanced seal for testing that includes sealing any longitudinal and
circumferential sew seams.
Pipeline conditions such as contamination and corrosion may also
influence the seal.
A leak tight sealed best achieved with a double block and bleed
plug or multiple plugs with a bleed tap between them.
Our 128 and 129 PeteStopTM Inflatable Line Stops are
designed to be inserted through a hot tap and can provide for most
Initially there may be air between the bladder and outer plies, so
some air may escape through the sew seams when inflated. The pressure
should then stabilize and not drop over time.
Outside of a pipe, the max pressure for unsupported plugs is 5% of
the plug’s rated pressure or 5 PSI, whichever is less.
No. We do not.
No, we can train you or your contractor to use our equipment.
Contractors on this link are also available to install our equipment -
Typically, we categorize them by Inflatable or Mechanical. We have
plugs for most size, pressure, and temperature requirements.
Many items are in stock for same day shipment. Standard items out of
stock generally in 2 - 3 days. Items built for a specific project are
manufactured often can be shipped in 2 - 3 weeks. Expediting is
usually available upon request
Per the vendor, yes, it is certified
We are just north of Milwaukee at 421 Wheeler St. Fredonia, WI 53021
All Petersen manufactured items are produced in the USA. Some items
sourced from others may be manufactured in a country listed in the
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.
Returns: Email “Returned Goods Authorization” request for standard
items in new condition returned within 30 days to: Sales@PetersenProducts.com
Include the original Order Number and Date received. Any credit allowed will
be against future purchases after a 20% handling and restocking charge.
Please download, complete and attach this
form with your email.