Model HT Casing Spacer by GPT

Model HT Casing Isolators are designed primarily for smaller diameter steel or polyethylene carrier pipes.
Grouped product items
Product Name Qty
Model HT Casing Isolator, 2" x 4", by GPT
Model HT Casing Isolator, 3 x 6", by GPT
Model HT Casing Isolator, 4" x 8", by GPT
Model HT Casing Isolator, 6" x 10", by GPT
Model HT Casing Isolator, 8" x 12", by GPT
Model HT Casing Isolator, 10" x 14", by GPT
Model HT Casing Isolator, 12" x 16", by GPT


Polycarbonate is used in the manufacture of the Hi-Temp isolators/spacers giving them the ability to be used for applications that may reach 280- degrees F. (138° degrees C.). In addition to heat resistance, they also offer excellent electrical isolation, high abrasion resistance and low coefficient of friction for a wide variety of double containment carrier/casing pipe applications. Light in weight and easy to handle during installation, Model HT casing isolators also feature ribbed inner surface that prevents slippage and guards against carrier pipe coating damage. The outer surface may include any one of several molded runners to accommodate 2" (50.8mm) x 4" (101.6mm) or larger carrier/casing differentials.


  • May be used for high-temperature applications.
  • Unique formulation of polymers allows isolator/spacer to be used in applications where temperatures may reach 280-degrees F. (138-degrees C.)
  • Ribbed inner surface prevents slippage and guards against coating damage.
  • Lightweight for ease of handling and installation.
  • Screwdriver is only tool needed for installation.
  • Model available with non-metallic hardware.
  • Eliminates the need for grout, blown sand or pea gravel.




Targeted Use - Energy

 For carrier pipe diameters (Nominal Steel & IPS) ranging from 3/4” (19.1mm) to 12” (304.8mm)

 For carrier pipe insertion lengths up to 400 feet.* (121.9M)

 Spacing Recommendation: Max 8’ (243.8cm) between spacers, Max 2’ (61.0cm) from casing pipe end.

 Recommended End Seals: Model C, S, W, R and FW.

*Model HT Casing Isolators are designed primarily for smaller diameter steel or polyethylene carrier pipes (ANSI O.D. pipe without a bell or mechanical joint). We do not recommend that they be used on any carrier pipe over 12" (30.5cm) in diameter or for installations over 400 feet (121.9M) long without consulting with PSI. HT Isolators should not be used on concrete carrier pipe.

Material Specifications for Coated Casing Spacers

Band/Runner Segments   Injection Molded Virgin Polyethylene
Tensile Strength D790 8,100 - 9,000 psi
Compressive Strength D695 12,500 psi
Water Absorption D570 0.1%
Temperature   280° F. Max. (138° C.)
Impact Strength D256 1.5 - 2.0 ft lb/in.
(0.8 - 1.07 newton-meter/cm)
Dielectric Strength D149 450 Volts/Mil.
Color   Black


Liner - T.P.E. Liner   (HT Models 6x10 through 12x16)

Thickness 0.118" (3.0mm)
Hardness Shore "A" 73
Dielectric Strenght

1/8" (3.18mm) Surge Test
Step-by-step Test 

60,000 V min.
58,000 V min.
Water Absortion 1% max.

3/4" (19mm) through 12" (305mm) = 2-piece with molded-in runners.

Metallic - Bolts and Square Nuts = Plated Steel
Non Metalic - Bolts and Nuts = High Temp Plastics 


Model HT Band Width and Runner Hight

Model Size Band Width Runner Height
3/4 X 2  3.0" (76.19mm) 5/16" (7.94mm)
1 X 3 3.0" (76.19mm) 1/2" (12.7)
1-1/4 X 3 3.0" (76.19mm) 1/2" (12.7)
1-1/2 X 3 3.0" (76.19mm) 1/2" (12.7)
2 X 4  4.0" (101.6mm) 5/8" (15.88mm)
3 X 6 4.0" (101.6mm) 5/8" (15.88mm)
4 X 8 4.0" (101.6mm) 1" (25.4mm)
6 X 10* 4.0" (101.6mm) 1" (25.4mm)
8 X 12* 5.0" (127.0mm) 1" (25.4mm)
10 X 14* 5.0" (127.0mm) 7/8" (22.23mm)
12 X 16* 5.0" (127.0mm) 7/8" (22.23mm)

*= Sold with Liner.
Note: Model HT Sized for Nominal Steel and IPS Pipe.


Model HT (High Temp) Non-metallic Casing Spacers 

  • Model HT runners are molded as an integral part of each segment.
  • Runner height range from 5/16” (8.0mm) to 7/8” (48.5mm) depending on model dimensions.
  • Runner height is symmetrical around spacer.
  • Runner/Band width for HT spacers is 3.0” (7.94mm) through 5.0” (127.0mm).


Model HT (High Temp) Non-metallic Casing Spacers

  • Standard position within casing.
  •  Runner height must be symmetrical around spacer.

Ordering Information

To Order Model HT Casing Spacers

  1. Quantity
  2. Model Number = (HT)
  3. Carrier Pipe O.D.
  4. Coating Thickness
  5. Casing O.D. and Wall Thickness
  6. Contact your local distributor or Pipeline Seal & Insulator, Inc.