PSI Model HT (Hi-Temp) Casing Spacers/Isolators
A unique formulation of polymers is used in the manufacture of the Hi-Temp spacers giving them the ability to be used for applications that may reach 266° F. (130° C.).
PSI Model HT (High Temperature) Non-Metallic Casing Spacers/Isolators
Model HT Description
A unique formulation of polymers is used in the manufacture of the Hi-Temp isolators/spacers giving them the ability to be used for applications that may reach 266°F. (130°C). In addition to heat resistance, they also offer excellent insulation, 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. One piece solid molded segments provide for maximum load bearing. Hardware includes cadmium plated steel studs, nuts and washers. A screwdriver is the only tool needed for installation.
- For carrier pipe diameters (Nominal Steel & IPS) ranging from 3/4″ (19.1mm) to 12″ (304.8mm).
- For carrier pipe insertion lengths up to 300 feet.*
- 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″ in diameter or for installations over 300 feet long without consulting with PSI. PE Isolators should not be used on concrete carrier pipe.
Benefits and Features
- Band width = 5 in.(127mm)
- May be used for high-temperature applications
- Unique formulation of polymers allows isolator/spacer to be used inapplications where temperatures may reach 266°F. (130°C.)
- Ribbed inner surface prevents slippage and guards against coating damage.
- Lightweight for ease of handling and installation.
- Screwdriver only needed for installation.
- Model available with non-metallic hardware.
- Eliminates the need for blown sand or pea gravel
Typical Application for Model HT Casing Spacers
Recommended Maximum Spacing
Distance between all model HT Isolators/Spacers should not exceed 5 ft.(1.5m) to 8 ft.(2.4m) center-to-center. An isolator/Spacer should be placed within 2 ft. (0.6m) on each side of a coupling or joint and within 1 ft. (0.3m) of each end of the casing.
Material Specifications for
PSI Model HT Casing Spacers and Isolators
|Material||Injection Molded Virgin Polyethylene|
|D790||8,100 – 9,000 psi|
|Temperature||266°F. Max. (130°C.)|
|D256||1.5 – 2.0 ft.lb/in.
(0.8 – 1.07 newton meter/cm)
Liner – none
3/4″ (19mm) through 12″ (305mm) = 2-piece with molded-in runners.
Metallic – Bolts and Square Nuts are plated steel
Non-Metallic – Bolts and Nuts are high temperature plastic
Model HT Casing Spacer
Band Width and Runner Height
|Hardness||Shore “A” 73|
1/8″ (3.18mm) Surge Test
|60,000 V Min.
58,000 V Min.
|Water Absorbtion||1% Max.|
|Model Size||Band Width||Runner Height|
|3/4 × 2||3.0″ (76.19mm)||5/16 (7.94mm)|
|1 × 3||3.0″ (76.19mm)||1/2″ (12.7mm)|
|1 1/4 × 3||3.0″ (76.19mm)||1/2″ (12.7mm)|
|1 1/2 × 3||3.0″ (76.19mm)||1/2″ (12.7mm)|
|2 × 4||4.0″ (101.6mm)||5/8″ (15.88mm)|
|3 × 6||4.0″ (101.6mm)||5/8″ (15.88mm)|
|4 × 8||4.0″ (101.6mm)||1″ (25.4mm)|
|6 × 10*||4.0″ (101.6mm)||1″ (25.4mm)|
|8 × 12*||5.0″ (127.0mm)||1″(25.4mm)|
|10 × 14*||5.0″ (127.0mm)||7/8″ (22.23mm)|
|12 × 16*||5.0″ (127.0mm)||7/8″ (22.23mm)|
|* Sold with liner
Model HT sized for nominal steel and IPS pipe.
For Hi-Temp Applications over 12″ Nominal O.D. use metallic casing spacers with T. P. E. Liner.
Manufacturer’s warranty statement will be supplied upon request to Allied Corrosion Industries, Inc.
How to Order Model HT Casing Spacers
To order Coated Casing Isolators please indicate the following:
- Model HT
- Carrier Pipe O.D.
- Coating Thickness
- Casing Pipe O.D. and Wall Thickness
- Contact your local distributor or Pipeline Seal & Insulator, Inc.
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″ in diameter or for installations over 300 feet long without consulting with PSI. HT Isolators should not be used on concrete carrier pipe.
- For larger sizes contact Allied Corrosion Industries for price.
- For carrier pipes with mechanical joints, consideration should be given to either using a steel casing insulator or making sure that the effective skid height of the plastic insulator will accommodate the O.D. of the mechanical fitting.
Model HT Sizes Ordering Information
Units Per Case
|Per Unit Weights
|(S) means Somastic coated pipe|
Typical Specifications for Model HT Casing Spacers
Casing Isolator Specification
Casing isolators/spacers shall be PSI Model HT molded from Polycarbonate plastic in two segments. Each spacer segment shall be a solid, non-welded molded piece designed for accommodating specific size pipe O.D.’s.
Each casing spacer shall be manufactured at a facility that has a Registered ISO 9001:2008 Quality Management System. Copy of current ISO 9001:2008 registration shall be provided with material submittal.
Approved manufacturer: Pipeline Seal and Insulator, Inc. For 3/4″ (19mm) through 12″ (305mm) nominal diameter carrier pipe use 2-piece model HT.
End Seal Specification
After insertion of the carrier pipe in the casing, the ends of the casing shall be closed by installing a PSI Model “C”, Model “S” or Model “FW” casing end seal as manufactured by Pipeline Seal and Insulator, Inc., Houston, TX.
Link-Seal® End Seal Specification
(Carrier Pipe Must Centered Within Casing)
After insertion of the carrier pipe in the casing, the ends of the casing shall be closed by installing the Link-Seal® end seals and a 1/8″ thick synthetic rubber end seal equal to the PSI Model “C” end seal. Both as manufactured by Pipeline Seal and Insulator, Inc., Houston, TX.
The foregoing performance data is intended as guideline material only and is based on assumptions of general and reasonable use. Performance suitability for any specific application should be determined by the user.
PDF Documents for Download
Casing Spacer and End SealsEngineering Manual and Buyers Guide