#Expansion

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Expansion loops accommodate thermal movements by installing sections of piping that run perpendicular to the piping system. Although these loops are semi-rigid, they do allow for some movement, thus reducing stress loads on the anchor points in the piping system.
Expansion loops provide sufficient flexibility to prevent thermal expansion and contraction from causing excessive stresses in the piping system. Expansion loops often are required in high-temperature gas well flow lines and gas and water injection lines.
Design Guidelines For Pipe Expansion Loop.
The expansion loop is usually located on the side of the hottest line.
The expansion loop, as a rule, should be located in the center of the distance between two anchors.
The height of the expansion loop is normally twice the width.
Loops should always be positioned in the middle of a pipe run, with anchors at the end of each run. Loops are often useful on a drop rod system as axial expansion devices cannot be used on such a system.
Temperature changes cause an object or substance to change shape, area or volume. Pipes will generally expand when heated, and contract when cooled. This is caused by the molecular structure expanding due to the increased kinetic energy at a higher temperature - causing the molecules to move around more.
Metals has the capacity to expand or contract due to temperature change. Metals pipe also expand in summer and contract in winter, such changes can cause deformities, inorder to avoid this, loops are joined with the metal pipe.
Expansion loops provide sufficient flexibility to prevent thermal expansion and contraction from causing excessive stresses in the piping system. Expansion loops often are required in high-temperature gas well flow lines and gas and water injection lines.
The loops are known as expansion loops. They need to be placed in pipelines to enable the pipelines to contend with thermal expansion and contraction and other forces that can affect the pipeline. They are typically placed in gas pipelines, irrespective of when the gas is hot or cold - natural gas or steam.
Pipe Expansion Loops
One of the common types of expansion devices is a pipe expansion loop. Pipe expansion loops accommodate thermal movements in a piping system by installing sections of piping that run perpendicular to the piping system, as pictured below.
Looping is a pipeline section laid parallel to the main gas pipeline. It is connected to the linepipe constructively and technologically. ... That is why, with original gas pressure remaining constant, an increase in the flow efficiency of a gas pipeline in general is directly related to the looping length.
Expansion loops provide sufficient flexibility to prevent thermal expansion and contraction from causing excessive stresses in the piping system. Expansion loops often are required in high-temperature gas well flow lines and gas and water injection lines.
Piping expansion loops are used to increase the flexibility of the piping system. To reduce the generated expansion stress and displacement caused by thermal expansion or contraction, legs perpendicular to the main piping system are provided. This perpendicular length is known as the length of the expansion loop.