Stainless Steel Casing Spacers - Isolators (Model S)

Stainless Steel Casing Spacers - Isolators (Model S)

Description

Tough, heavy duty 14 gauge (0.74"[1.88mm]) 304 stainless steel isolators/spacers are available for use in highly corrosive environments. They offer maximum corrosion resistance while providing support for large diameter pipe, unusually heavy pipe or for long casing pulls.
The flanges of the spacer are deep embossed and the corners are chamfered.

The runners are attached with 3/8" (9.5mm) diameter studs, which are fusion welded to the band. The studs 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.

Targeted Use - Water

  • For carrier pipe diameters ranging from 4" (101.6mm) to 120" (304.8cm).
  • For carrier pipe insertion lengths up to 5,000 feet* (1,524M)
  • Spacing Recommendations: Max 8' (243.8cm) between spacers, Max 2' (61.0cm) from casing pipe end, Max 2' (61.0cm) on each side of bell or mechanical joint.
  • 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 Stainless Steel Casing Spacers

Benefits/Features of Stainless Steel Casing Spacers

  • Low Labor Costs - May Be Installed
    By One Person
  • Glass Reinforced Nylon or Polyester Runners Offer Low 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
  • Offers excellent corrosion resistance
  • May be used for long pulls and/or heavy pipe installations
  • Designed to last for the life of the piping system
  • PVC Liner Provides Back-up Isolation
  • 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 Stainless Steel Casing Spacers

Band

14 Gauge (0.074"[1.88mm]) 304 stainless steel.
(S8 and S12)

12 Gauge (0.105" [2.66mm]) 304 stainless steel.
(S12 = 40"#216; and up) Engineer/Contractor must specify.

16 Gauge (0.061" [1.56mm]) 304 stainless steel.
(Model SL8)

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

Configurations - Band

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

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

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

Finish - None

Liner - Polyvinyl Chloride Liner (Standard)

Thickness

0.090" (2.29mm) minimum

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 C12 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]) 304 stainless steel MIG welded to band.
(standard S8 and S12)

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

12 gauge (0.105" [2.667mm]) steel MIG welded to band (Model SL8)

Hardware (Threaded Studs, Nuts and Washers)

Threaded Studs = 5/16" - 18 x 2-1/2"
304 staianless 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

2" (51mm) Wide Glass Reinforced Polyester (G) or Nylon Runners (GN)

4" (101.6mm) thru 12" (305mm) = 2 top and 2 bottom
14" (356mm) thru 36" (914mm) = 2 top and 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
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
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 strengthof polyethylene runners. Our Model G polyester 2" wide runners are particularly designed for heavier pipes and longer pulls.

 

Installation Instructions for Stainless Steel 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.
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 1/2" 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.
  • 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 1/4"), bore of casing beyond quality tolerances, bend or sags exist in the casing, these tolerances could be diminished.

*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.

How To Order Stainless Steel Casing Spacers

To order stainless steel casing isolators please indicate the following:

  1. Quantity
  2. Type Finish
  3. Band Width
  4. Runner Width
  5. Carrier Pipe O.D.
    (Type and coating thickness if applicable.)
  6. Casing Pipe I.D.
    (Type and coating thickness if applicable.)
  7. Carrier Pipe Joint O.D. (if applicable)
  8. Carrier Pipe Position within Casing
  9. Length of Crossing
  10. Contact your local distributor or Pipeline Seal & Insulator, Inc.