Painted Casing Spacers - Isolators (Model A)

Description

Painted Casing Isolators are used to electrically separate carrier pipes from the casings through which they pass.
A rust inhibiting paint is applied over 14 or 12 gauge hot rolled and pickled mild steel for casing isolators 4" (101.6mm) diameter and up - in either 8" (203mm) or 12" (305mm) wide bands. The flanges of the spacer are deep embossed and the corners are chamfered.

The GN2 runners are attached with 3/8" (9.5mm) diameter studs, which are fusion welded to the band before it is painted. They are recessed far below the wearing surface of the runner and, after the runner is anchored to the band, the stud counter-bore is filled to insure a water tight seal for the stud and the lock fastener.
GN1 and G1 runners are attached by projection welded method.

Targeted Use - Filled Casings

• For carrier pipe diameters ranging from 4" (101.6mm) to 120" (304.8cm)
• For carrier pipe insertions up to 5,000 feet* (1,524M)
• Spacing Recommendation: Max 8' (243.8cm) between spacers, Max 2' (61.0cm) from casing pipe end, Max 2' (61.0cm) on each side of weld.
• Recommended End Seals: Model C, S, W, R and FW.

*Pipe insertion lengths may vary depending on type of casing pipe, condition of casing pipe or other factors that may cause excessive abrasion to runner materials.

Typical Application for Painted Casing Spacers

Benefits/Features of Painted Casing Spacers

• Low Labor Costs - May Be Installed By One Person
• Glass Reinforced Runners Offer Coefficient of Friction = 0.1 to 0.6
• Glass Reinforced Nylon or Polyester Runners Offer 18,000 PSI (1,265kg/cm²) Compressive Strength
• Riser Height May Be Specified For Specific Positioning of Carrier Pipe Within Casing
• Heavy Duty PVC Inner Liner Provides Protection For Pipe and/or Coating

• PVC Liner Provides Back-up Insulation
• Deeply Embossed Flanges Offer Added Strength During Tightening of Flange Bolts
• Eliminates the Need for Blown Sand or Pea Gravel
• Available with 8" or 12" bands.
• 10 or 7 gauge risers may be ordered.

Casing Spacer Field terminology

Material Specifications for Painted Casing Spacers/Isolators

Band

14 Gauge (0.074"[1.88mm]) hot rolled and pickled mild steel.

12 Gauge (0.105" [2.66mm]) hot rolled and pickled mild steel. (40" Ø and up.)

Flanges of the spacer are deep embossed and the corners are chamfered

Configurations

4" (101.6mm) through 36" (914mm) = 2-piece

36" (914mm) through 48" (1,219mm) = 3-piece

48" (1,219mm) and over = Consult Factory

Finish

Rust Inhibiting Paint

Liner - Polyvinyl Chloride (Standard)

Thickness	0.090" (2.29mm) min.
Hardness	Durometer "A" 85-90
Dielectric Strength   1/8" (3.18mm) Surge Test   Step-by-Step Test	60,000 V min. 58,000 V min.
Water Absorption	1% max.
Temperature	-40 to +170°F(-40 to 76°C)

Liner - T.P.E. Liner (Temperature Extremes)
Model A12 Only

Thickness	0.118" (3.0mm)
Hardness	Shore "A" 73
Dielectric Strength   1/8" (3.18mm) Surge Test   Step-by-Step Test	60,000 V min. 58,000 V min.
Water Absorption	1% max.
Temperature	-50 to +270°F(-45 to 132°C)

Risers

10 Gauge (0.135" [3.43mm]) steel MIG welded to band. (Standard)

7 Gauge (0.179" [4.55mm]) steel MIG welded to band. (Contact PSI)

Hardware (Threaded Studs, Nuts and Washers)

Threaded Studs = 5/16" - 18 x 2-1/2" 304 stainless steel or plated

Hex Nuts = 5/16"

Washers = 5/16" SAE 2330

Configurations (Threaded Studs, Nuts and Washers)

8" (203.2mm) Band = 6 studs, 12 nuts and washers

12" (305mm) Band = 8 studs, 16 nuts and washers

Material Specifications for G and GN Runners

Runners (G and GN)
NOTE: GN Material is the PSI Standard Material

Sizes and Configurations

Painted - 1" (25.4mm) or 2" (51mm) Wide Glass Reinforced Polyester (G) or Nylon runners (GN)

4" (101.6mm) through 12" (305mm) = 2 top & 2 bottom 14" (356mm) through 36" (914mm) = 2 top & 4 bottom 38" (965.2mm) and over = Consult Factory

Runner Specifications (G and GN)

Tensile Strength, (ASTM D638)	17,600 psi (1,237kg/cm²)
Flexural Strength, (ASTM D790)	25,300 psi (1,779kg/cm²)
Compression Strength, (ASTM D695)	18,000 psi (1,266kg/cm²) (10% Deformation)
Deflection Temp. @ 264 psi, (ASTM D648)	405°F (205°C)

Effective Runner heights and Lengths = G and GN Sizing carrier pipe O.D. and casing I.D. can be misleading at times due to a difference between nominal and effective dimensions. When sizing, make sure to consider effective runner height. Two heights are available/used; custom positioning in the casing can be achieved with riser heights.

Heights - Nominal Versus Effective 1" and 2" Wide Glass Reinforced Nylon or Polyester Runners Nominal = 1.0" (25.4mm) - 1.5" (38.1mm) Effective = 1.07 (27.2mm) - 1.70" (43.2mm)

Lengths - Effective 1" Wide Glass Reinforced Nylon or Polyester Runners 8.5" (215.9mm) - 12.5" (317.5mm) 2" Wide Glass Reinforced Nylon or Polyester Runners 7.0" (177.8mm) - 11.0" (279.4mm) Glass reinforced polymer runners are standard in 2" (50.8mm) widths for Model C (coated). PSI GN glass reinforced nylon runners have 5 times the compressive strength of polyethylene runners. Our Model G Polyester 2" wide runners are designed for heavier pipes and longer pulls.

Warranty

All products are warranted against failure caused by manufacturing defects for a period of one year. Any product found to be so defective and returned within one year from date of shipment will be replaced without charge. The above warranty is made in lieu of, and we disclaim, any and all other warranties,

expressed or implied, including the warranties of merchantability and fitness for a particular purpose, and buyer agrees to accept the products without any such warranties. We hereby disclaim any obligation or liability for consequential damages, labor costs or any other claims or liabilities of any kind whatsoever.

Installation Instructions for Painted Casing Spacers

Always Wear Appropriate Safety Equipment and Follow All Your Company Regulations!

In general, the actual physical insertion method is left to the expertise of the installation contractor and beyond the scope of PSI-Pipeline Seal and Insulator, Inc.
The following are suggested installation techniques and guidelines that should be taken into consideration when installing the casing spacers to the carrier pipe and handling prior to insertion.

• It is absolutely critical that when installing the casing spacer that the spacers are lined up perfectly straight on the carrier pipe. All runners should line up straight like the sight through a gun barrel, making sure all segments of the spacer correspond to the drawing.
• When handling the pipe it is also critical that the load is uniformly applied to all casing spacers on each joint of pipe and not just one. Furthermore, caution should be taken so they do not set the carrier pipe down with the casing spacers attached unless it is on a cut-a-way section of the casing pipe so the runners are bearing the weight uniformly. The weight should be uniformly distributed to all bottom runners at one time. Better yet, until the pipe is being installed, have the contractor place sand bags or similar material under the pipe to bear the weight.

• The casing spacers should be uniformly tightened so that approximately ½” space (by design) exists at each flange of the casing spacer. The studs at each flange should be tightened uniformly which should result in a torque reading of 60 inch-pounds (5 foot-pounds)*. Spacing between casing spacers is as detailed on the project or in accordance with the latest PSI literature.
• It is desirable to restrict or minimize rotation or rifling of the carrier pipe within the casing unless the spacers are designed with equal length runners and specifically intended to allow for rotation.
• Spacers are manufactured with requested clearance design. If weld beads are excessive (more than ¼”), bore of casing beyond quality tolerances, bend or sags exist in the casing, these tolerances could be diminished. Call PSI @ 800-423-2410 if any of these conditions exist.

*In most installations, torque wrenches are not used.
The nuts are tightened on the studs sufficiently, but not so much as to bend the flanges of the casing spacers.

Other Resources for Painted Casing Spacers

Casing Spacer and End Seals Engineering Manual and Buyers Guide