Casing
Spacers
 |
 |
 |
CASING
SPACERS & 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
& ADVANTAGES:
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 & 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
 |
END SEALS
Advance Products & 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, insuring 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 insure 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 insulate the carrier pipe from the casing. Innerlynx can be installed by one person and requires no special tools.
