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Casing spacers are predominately used within critical energy , water and sewer industries within their cased pipelines applications. Typically a carrier pipe needs to be cased per the local code requirements and therefore you need a spacer to install that carrier and hold a desired position within the casing.
Casing lines eliminate the need for rudimentary methods of filling the annual space with wooden blocks, sand, pipe cutaways and grout. Here’s our guide to all things “Cased Lines”.
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You have a carrier pipe that needs to be cased per the local code requirements and therefore you need a spacer to install that carrier and hold a desired position within the casing.
When installing your service pipe in a cased line it is important to source a product that will isolate the service pipe from the casing pipe. This will be critical to your pipeline integrity. By selecting a completely non-metallic casing spacer, you can ensure that the service pipe and the casing pipe will not come into contact and therefore you can avoid corrosion resulting from dis-similar metals coming into contact with each other. In addition, completely non-metallic spacers provide a “corrosionless” casing isolator. This is achieved through the use of the slidelock technology which features a composite slidelock fastener instead of steel bolts and nuts. This eliminates the risk of the casing spacers fastener degrading over time and eventually failing. This could lead to the carrier pipe and casing pipe coming into contact and degrading the integrity of the overall pipeline, risking leaks or failures of the carrier/service line.
By providing a wide variety of skid heights, we are able to achieve your desired service pipe position within the casing. This can be anything from centered and restrained for applications that are below the water level (floating carrier pipes) to standard position within the casing (standard clearance for oil and gas applications).
Centered and Restrained position combines the details referenced in restrained positioning with the need to be centered within the casing. Centered in this case requires an industry standard clearance of 1” at the top for ease of install. See centering for Link-Seal.
Standard positioning requires the casing spacer to lift the carrier pipe off of the casing leaving no direct contact. This is a standard practice in oil and gas pipelines. This is also common when working with NPS diameters with a standard carrier to casing differential.
Combined skid heights for unique applications. When it is critical that the carrier pipe be centered while also taking into consideration the 1” minimum clearance it is best to combine skid heights in the desired formation. With the versatile design of the Ranger II we are able to standardize the base assembly piece while offering a variety of runner heights. This means that all Ranger IIs within the same family (micro, mini, midi, medi, GKO) can be combined to meet your specific positioning needs.
Currently, many municipalities require service lines to be cased when crossing under major roadways, rail lines, densely populated areas, and highly critical areas. Many of these ‘runs’ are 400 feet/120 meters or less in length. This length is perfectly suited for a non-metallic casing spacer.
When using a non-metallic spacer with a slidelock fastener in place of a traditional metallic spacer you have the ability to adjust to imperfect pipe dimensions. Due to the adjustability of the fastening approach, the non-metallic spacer can be tightened to the OD that you come into contact with in the field. It is well known that temperature leads to expansion and contraction of most pipeline materials. This can present issues with custom fabricated steel spacers as they are fixed to the dimension provided at the time of order. With a non-metallic Ranger, all possible ODs are covered from 0.83” to 98.4” using just 5 different SKU’s.
When passing a carrier pipe through a wall penetration there is often pipe deflection or a lack of room to properly support the pipe before it passes through the wall. By using a casing spacer in the wall with the modular seal like Link-Seal we can ensure that the carrier pipe is both centered and supported at the point of the seal. This will eliminate two of the most common sources of failure for any wall penetration seal/modular seal.
The most common challenges wall penetrations face are unsupported pipe/off-center pipe. Casing spacers can assist with resolving this issue alongside the Link-Seal.
When considering which casing spacer to use it is important to understand how the casing spacer will perform under different installation circumstances. Here I will discuss length of run specifically as it pertains to the casing spacer selection process.
450 ft. run and under = Ranger II (any skid height)
Between 450 ft. and 1000 ft. = Ranger II (skid heights of less than 2 inches are best)
1000 ft. and over = PE casing spacer recommended
While length of run is a critical variable in this decision making process, it is also necessary to review the material used for the carrier and casing. Different materials come with different per foot weights and different coefficients of friction. Light weight pipe works well with all skid heights while heavy weight pipe works best with shorter skid heights. See load per spacer table below with reference to skid height.
Installation of metallic casing spacers is often challenging. The total number of pieces can be significant, the total weight of the spacer can be significant, and the shape of customer spacers are often awkward to handle and install. These are all key lessons we have learned through customer feedback when the metallic casing spacer was a part of our offering.