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Casing Spacers And End Seals

APS Casing Spacers center water and sewer pipes in casings with ease of installation, are virtually corrosion proof and provide insulating protection from a possible electrical shorting between the carrier pipe and casing. No special tools are needed, no grease is used and they are easily bolted on by a single worker. APS Casing Spacers eliminate the need to fill the casing annulus with sand which is extremely labor intensive. Sand in the annulus also acts as an electrolyte thereby introducing unwanted current to the steel or ductile iron. With no need for this fill, APS Casing Spacers are your answer to lower installation costs with continued access for maintenance.

Casing insulators are used to support and electrically insulate a pipeline from a casing pipe through which it must pass and are used in river crossings, canal crossings and bridge crossings as well as highway and railroad crossings. We recommend installation of polyethylene casing insulators every 6 to 8 feet.

* New Field-Adjustable Runners for Casing Spacers.

APS has recently developed Field-Adjustable Runners for Casing Spacers with 8" wide bands.

Facts And Advantages:

  • Field-adjustable.
  • Used for easy grade and elevation adjustment of gravity sewer lines.
  • Lend the ability to stock in-house decreasing inventory up to 75%.
  • Stock-able spacers will include 10-12 bands up to 24".
  • Runner sizes from 1" to 6" in 1/2" increments.

Stainless (Model SSI) and Carbon Steel (Model SI) Spacers

Heavy duty two piece stainless steel or carbon steel bands by APS serve virtually every piping application and should be utilized inside casing that is 2 or 3 pipe sizes larger than the carrier pipe. APS steel band casing is available in two widths. 8" width is recommended for carrier pipe 4" to 24". 12" width for carrier pipes 26" to 120" and larger. The band is constructed of 14 gauge steel with a 90 mil EPDM liner. Stainless steel spacers are available in grade 304L. Carbon steel spacers are available with a thermoplastic powder coating for extra corrosion protection.

Injection-Molded Polyethylene Spacers

Advance casing insulators are manufactured from injection molded high density virgin polyethylene. Benefits of polyethylene include high impact strength as well as abrasion resistance. Once installed, the low friction of polyethylene facilitates easy installation into the casing. Molded into the inner surface are grooves which prevent slippage of any carrier pipe coating. The Advance casing insulators have excellent dielectric resistance and low moisture absorption which yields minimal electric current loss and no impairment of cathodic protection. Sizes are available from 1" through 48" with a standard runner height of 1". Casing insulators from 1" through 12" comprise two halves; two pi and four pi sections make up 14" and above. Advance casing insulators are lightweight, economical and easy to install. Only a screwdriver is required for installation.

Custom Fabrication

APS is capable of manufacturing spacers and end seals for specific customer requirements. Our engineering staff has experience in the following:

  • Placing multiple carriers within one casing
  • Positioning thermally insulated pipe without damage to insulation
  • Centering small carriers within large casings
  • Positioning gravity sewer to on-grade requirements
  • Casing spacers for all types and sizes of pipe above 2"

APS Casing Spacers: The Right Choice

Advantages: With proven dependability and ease of installation, Advance Products and Systems' casing spacers easily outperform the labor intensive, inefficient and unreliable wood skids. Just check the comparison below.

  • Easily and efficient to install requiring no grease and no special tools
  • Installation by one person
  • Slides into place with ease. Coefficient of friction = .1
  • Requires no backfill
  • Decades of proven reliability
  • Insulating and long term corrosion protection

Skids and Straps

  • Difficult to install, cumbersome, time consuming and hard to secure accurately
  • Requires several workers an extended time to position
  • Very resistant to sliding often damaging skids enough to need replacement before installation is complete
  • Requires annulus space filler, such as sand, pea gravel or grout
  • High failure rate
  • Non-insulating and allows bacteria and differential Oxygen concentration corrosion
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End Seals

Advance Products and Systems End Seals outperform the costly and labor intensive brick and mortar method of sealing casing ends. While soil stress and pipe movement cause mortar to crack, the APS products move with the pipe, ensuring the integrity of the seal. And, unlike link-type sealing blocks that are limited to carrier/casing differential and can only be used on a concentric profile, the APS seals are totally flexible. APS offers four types of end seals which can accommodate any combination of pipe sizes.

The model AC and AM are seamless and can easily be pulled on at the time of construction while the model AW wrap-around is designed to facilitate installation when the carrier line has already been welded together and the pull is complete. Simply wrap around the carrier and casing, remove the release liner from the two pressure-sensitive butyl mastic strips, and press the adhesive strips down to form a seal. Model AZ, zipper-type end seal, wraps around the casing end and carrier pipe and zips shut to provide a tight seal while still allowing for pipe movement. All four are made of 1/8" thick synthetic rubber assuring excellent chemical resistance and resiliency and are secured with T-304 stainless steel banding straps with a 100% non-magnetic worm gear mechanism to ensure the integrity of the clamp. Only a screwdriver is required for installation.

In addition, Innerlynx forms a mechanical seal between pipelines and casing. Innerlynx forms a hydrostatic seal and electrically insulates the carrier pipe from the casing. Innerlynx can be installed by one person and requires no special tools.