Cased Lines

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

Introduction

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 

 

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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. 

 GUIDE

 

Guide to Installating a Casing Spacer

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Under Road Crossings 

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.  

Adjustability 

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. 

Centering for Link-Seal©

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

Length of Run

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.  

Example

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

 

Material Selection

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.

Ranger II© Casing Spacers Skid Height Max Load Per Spacer
 

Ranger II© Casing Spacers Skid Height Spacing: (Maximum Distance Between Casing Spacer 

MICRO

MINI

MIDI

MEDI

GKO

Skid Height

0.65”(38mm) to 1.97”(50mm)

175 lb.

500 lb.

1,250 lb.

3,300 lb.

5,000 lb.

Skid Height

2.56”(65mm) to 2.95” (75mm)

135 lb.

400 lb.

1,000 lb.

2,600 lb.

4,000 lb.

Skid Height

3.54”(90mm) to 3.94” (100mm(

120 lb.

350 lb.

875 lb.

2,300 lb.

3,500 lb.

Skid Height

4.92” (125mm) to 5.91”(150mm)

 

250 lb.

625 lb.

1,650 lb.

2,500 lb.

Skid Height

6.89” (175mm)

   

500 lb.

1,400 lb.

 

 

Weight and Spacing Guidelines
 

Ranger II© Casing Spacers Skid Height Spacing: (Maximum Distance Between Casing Spacer)

Skid Height

0.65”(38mm) to 1.97” (50mm)

8’ (feet)

Skid Height

2.56” (65mm) to 3.54” (90mm)

6’ (feet)

Skid Height

3.94”(100mm) and up

5’ (feet)

 

Installing a Casing Spacer 
 

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.

 

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