Hold-Down Pipe Clamps Product Video

Thermoplastic Isolator (TPI) – Technical Information

February 28, 2019

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What is Thermoplastic Isolator (TPI)?

Thermoplastic isolators provide optimum support and eliminate pipe contact with the supporting steel.

  • Moisture/water can be trapped between the pipe and support, which can initiate corrosion of the pipe
  • In addition, when TPI is placed between the pipe and the supporting structural steel, it can prevent cathodic reaction

Iron + Water + Oxygen = Rust  ➞  Corrosion

Piping Technology & Products can fabricate TPI designed for use with u-bolts. Our u-bolts, have a hot-dipped galvanized finish and are coated with Polyshrink. The Polyshrink acts as a barrier between the u-bolt and the pipe to prevent corrosion, and it also adds protection.

TPI Pipe
TPI Pipe (angle view)

TPI Pipe
TPI Pipe (front view)

Benefits of Thermoplastic Isolator (TPI):

  • TPI has a very high compressive strength
  • It is subject to very little “creep” over the period of time
  • TPI is easy to fabricate
  • Cutting and drilling holes can be easily done
  • Easy to Install
  • Very economical when compared to the leading competitor
  • It can be used with different types of pipe supports
U-Bolt with Thermal Plastic Isolator (TPI) & Polyshrink
U-Bolt with TPI

Installation of TPI:
TPI can be placed or attached to structural steel by three different methods.

  • Self-tapping screw or bolting
  • Double-sided adhesive tape
  • With u-bolt
Adjustable Pipe Supports with U-Bolt and TPI
Adjustable Pipe Supports with U-Bolt and TPI

Common Industry Application:

  • Petrochemical plants
  • Refineries
  • LNG plants
  • Offshore platforms
  • Wastewater plants
  • Parking garage
  • Marine pipelines


Types of TPI:
There is a total of 3 different types of TPI available based on thermal properties.

  • TPI White – Maximum Service Temperature 181°F
  • TPI Amber – Maximum Service Temperature 340°F
  • TPI Tan – Maximum Service Temperature 480°F

TPI Types

TPI (Thermoplastic Isolator): Properties & Various Grades
TPI WhiteTPI AmberTPI Tan
Property ValueASTM TestImperialImperialImperial
DensityD792 0.0516 lb/in30.0458 lb/in30.047 lb/in3
Tensile StrengthD63811,000 psi17,000 psi16,000 psi
Tensile Modulus of ElasticityD638450 ksi500 ksi630 ksi
Elongation (At Break)D63830%60%40%
Flexural Modulus of ElasticityD790450 ksi500 ksi600 ksi
Flexural StrengthD79013 ksi20 ksi25 ksi
Compressive StressD69516 ksi22 ksi20 ksi
Coefficient of FrictionQTM 550070.250.420.32
IZOD Impact (Notched)D2561 ft-lb/in0.5 ft-lb/in 0.6 ft-lb/in
Rockwell Hardness D785M 88M 115M 105
Maximum Service Temperature(Long Term)181ºF340ºF480ºF
Melting PointD3418347ºF410ºF644ºF
Coefficient of Linear ExpansionE83147 µin/in/ºF31 µin/in/ºF-
Flammability RatingUL94HBV-0V--0
Electric StrengthD149450 V/mil830 V/mil480 V/mil

Key Factors in choosing PT&P’s Thermoplastic Isolator over Competitors:

  • All suppliers of plastic components for these types of supports, purchase raw materials from some of the same sources
  • PT&P’s TPI is equivalent to competitors, but the price of TPI is much lower
  • In addition, TPI can be tested in any independent lab
Comparison between PT&P’s TPI White VS Leading Competitor
Property ValueASTM TestTPI - WhiteCompetitor
DensityD792 0.0516 lb/in30.0509 lb/in3
Tensile StrengthD638 11,000 psi 9,400 psi
Tensile Modulus of ElasticityD638 450 ksi 380 ksi
Elongation (At Break)D638 0.330-60%
Flexural Modulus of ElasticityD790 450 ksi 400 ksi
Flexural StrengthD790 13 ksi 13 ksi
Compressive StressD695 16 ksi 15 ksi
Coefficient of FrictionQTM 55007 0.250.25
IZOD Impact (Notched)D256 1 ft-lb/in 1 ft-lb/in
Rockwell Hardness D785 M 88 M 88
Maximum Service Temperature(Long Term) 181ºF 181ºF
Melting PointD3418 347ºF 329ºF
Coefficient of Linear ExpansionE831 47 µin/in/ºF 54 µin/in/ºF
Heat Deflection Temperature, 264 psiD648 250ºF 220ºF
Flammability RatingUL94 HB HB
Electric StrengthD149 450 V/mil 420 V/mil
Result from above comparison, both products are equivalent
Comparison between PT&P’s TPI Amber VS Leading Competitor
Property ValueASTM TestTPI – AmberCompetitor
DensityD792 0.0485 lb/in3 0.0462 lb/in3
Tensile StrengthD638 17,000 psi 16,500 psi
Tensile Modulus of ElasticityD638 500 ksi 500 ksi
Elongation (At Break)D638 0.630-60%
Flexural Modulus of ElasticityD790 500 ksi 500 ksi
Flexural StrengthD790 20 ksi 20 ksi
Compressive StressD695 22 ksi 22 ksi
Coefficient of FrictionQTM 55007 0.420.42
IZOD Impact (Notched)D256 0.5 ft-lb/in 0.5 ft-lb/in
Rockwell HardnessD785 M 115 M 112
Maximum Service Temperature(Long Term) 340ºF 340ºF
Melting PointD3418 410ºF 410ºF
Coefficient of Linear ExpansionE831 31 µin/in/ºF 31 µin/in/ºF
Heat Deflection Temperature, 264 psiD648 400ºF 400ºF
Flammability RatingUL94 V-0 V-0
Electric StrengthD149 830 V/mil 830 V/mil
Result from above comparison, both products are equivalent.
Comparison between PT&P’s TPI Tan VS Leading Competitor
Property ValueASTM TestTPI - TanCompetitor
DensityD7920.047 lb/in30.047 lb/in3
Tensile StrengthD63816 ksi16 ksi
Tensile Modulus of ElasticityD638630 ksi500 ksi
Elongation (At Break)D6380.40.2
Flexural Modulus of ElasticityD790600 ksi1000 ksi
Flexural StrengthD79025 ksi25 ksi
Compressive Stress D69520 ksi 20 ksi
Coefficient of FrictionQTM 550070.320.4
IZOD Impact (Notched)D2560.6 ft-lb/in1.0 ft-lb/in
Rockwell Hardness D785M 105M103
Maximum Service temperature(Long Term)480ºF480ºF
Melting PointD3418644ºF644ºF
Coefficient of Linear ExpansionE831--
Heat Deflection Temperature, 264 psiD648320ºF320ºF
Flammability RatingUL94V--0V--0
Electric Strength D149480 V/mil-480 V/mil-
Result from above comparison, both products are equivalent.


What factors go into calculating Pipe Thickness?

May 9, 2014

When calculating your pipe thickness, you want to take a few parameters into consideration:

1.) What is your Operating Temperature?
2.) What will be the Maximum Pressure?
3.) What will you be transferring inside the pipe?
4.) Does your material have any corrosion factors?
5.) What is your expected Life Span of the pipe?

What is a steel washer plate?

January 10, 2012

Steel washer plates are components used on top of channels or angles to support pipe with rods or U-bolts.

What is a pig receiver?

November 3, 2011

A pig receiver is a device that “catches” the cleaning device (“pig”) after it has passed through the pipeline.

Pig receiver with a 24
Pig Receiver with a 24″ Dia. Minor Barrel

What is a pig launcher?

A pig launcher is a device which uses a pressurized container to shoot a cleaning device (“pig”) through the pipeline to perform a variety of functions including cleaning, monitoring, and maintaining of the pipe.

Pig Launcher and Receiver with a Flag Indicator
Pig Launcher and Receiver

What is a pipe guide?

February 11, 2011

A pipe guide can be categorized into two types. The first is as a shoesupport attached directly to the pipe with external components which direct thepipe during the thermal deflection cycle. The second type of guide surroundsthe pipe and is attached to stationary structures, allowing the pipe to move.

Pipe Guide with Slide Plates
Pipe Guide with Slide Plates

What is a j-rod on a pipe support?

When referring to constants, the j dimension refers to the diameter ofthe rod which transfers our load from the constant to the support component.(i.e. clamp, clevis, etc.)

Constant Drawing with J Dimension Shown
Constant Drawing with J Dimension Shown

What is a cold shoe?

A cold shoe refers to a support component which incorporates an insulating material that attaches directly to the pipe and also functions as a load bearing component transferring the load to a point outside of the insulating enclosure.

Cryogenic Supports with Permali Insulation for an LNG Plant in Abu Dhabi
Cryogenic Supports (Cold Shoes) with Permali Insulation

What happens if variable spring variability increases?

When the variabilityof a variable springexceeds the MSS standard of 25%, the designer's first option would be to lowerthe spring rate so that the difference in load with the same amount of movementwould be smaller than that associated with the higher spring rate. The designerwould continue this exercise until a variability factor of less than 25% isachieved.

What is a clevis and yoke?

A clevis and yoke refers to two components used when temporarily riggingpipes into position which consists of an adjustable strap which fits around thepipe. The clevis then attaches the temporary strap to our lifting mechanism.

What does variability mean in pipe supports?

Variability applies to variable spring supports and is basically a ratiobetween the difference in load and the operating load of the spring. Thedifference in load is a function of the spring rate and travel. Per MSS, themaximum recommended variability would be 25%. However, critical systems such asmain steam supports may require variability factors less than 25%.

What can I use to hold down insulation?

In general, insulation, whether for low temperature or high temperatureuse, is clad with a metallic sheet (usually aluminum) and that metallic sheetis held in place by either straps or wire at predefined intervals along thepipeline.

What is a spring support?

We refer to our spring supports as any assembly which includes a spring(either variable or constant) that can accommodate both a pipe load and a pipemovement.

U-Type Constant Springs Custom Designed for Large Travel for an Oil Refinery

Variable Springs Constant Springs

What are piping struts?

February 1, 2011

Piping struts,also referred to as sway struts, are devices used to restrain movement of piping in one direction while providing for movement due to thermal expansion or contraction in another direction.

Sway Strut Assemblies with Custom Designed 3-Bolt Pipe Clamps
Sway Struts with 3-Bolt Pipe Clamps

What is a pipe anchor support?

A pipe anchor support is a rigid device that completely restricts pipe movement in all three dimensions while bearing the weight, side, and thrust loads. It is designed to prevent essentially all pipe rotation and displacement at the point of application.

Cold Insulated Pipe Anchors with Axial Stops
Cold Insulated Pipe Anchors with Axial Stops

What is a sway brace?

A sway brace is a device that is recommended for controlling vibration, absorbing shock loadings, guiding or restraining the movement of pipe resulting from thermal expansion, and bracing a pipe line against sway. They contain springs that provide a restraint force in both a tension and compression mode.

Custom Sway Braces with Ball Joints for a Refinery
Sway Braces with Ball Joints


What is a riser clamp?

A riserclamp is a pipe clamp for thesupport of vertical pipelines, and they include separate load bolts, totransfer the piping load to the remainder of the pipe hanger assembly.

Riser Clamps

What is a hydraulic snubber?

November 3, 2010

A hydraulic snubber is a device that permits pipe deflection under normal operating conditions, but when subjected to an impulse load, such as an earthquake, water hammer, etc., the snubber becomes activated and acts as a rigid restraint torestrict pipe movement as a result of the unwanted impulse loading.

A hydraulic snubber includes a hydraulic fluid reservoir and cylinder to produce the restraint force when activated.

Hydraulic Snubbers with Protective Boots
Hydraulic Snubbers with Protective Boots

What is a mechanical snubber?

A mechanical snubber is a device that permits pipe deflection under normal operating conditions, but when subjected to an impulse load, such as an earthquake, waterhammer, etc., the snubber becomes activated and acts as a rigid restraint to restrict pipe movement as a result of the unwanted impulse loading.

A mechanical snubber uses gears and springs to produce the restraint force when activated.

Mechanical Snubbers for a Refinery
Mechanical Snubbers