Cased Lines

Casing spacer systems are designed for inserting carrier pipes, conduits, and cables though casing pipes.


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”. 

Table of Contents

  1. What is a Cased Line?  
  2. Why is Having Cased Lines Important?
  3. Cased Line Positioning & Applications
  4. Restrained Positioning Centered Position
  5. Installing a Casing Spacer 

What is a Cased Line?

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.


Why is Having Cased Lines Important? 

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.  

Runner material and lengths play a critical role when considering if your Casing Spacer will isolate your carrier pipe from your casing pipe.  This is especially critical when water is present within the casing. A metallic casing spacer is designed with steel runners and a small 1-2 inch thick isolating skid.  If the water level exceeds the 2” isolating skid then the spacer is no longer able to isolate the carrier from the casing. The non-metallic runners that come with a completely non-metallic casing spacer provide zero opportunity for shorting due to their being no conductive materials in use.  A completely non-metallic spacer with skid heights to center the pipe will allow for the use of a water tight modular seal to eliminate the ingress of water is the most robust solution in the market for isolating a carrier pipe through a casing pipe. 

Cased Line Positioning & Applications Restrained Positioning 

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 Position

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

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.  

Combining Skid Height 

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.