Why are expansion loops used?

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.

How do you calculate expansion loop in a pipe?

The formula for calculating thermal expansion: ΔL = C x L x (Tf – Tg) x 12in./ ft. Copper (C) = 9.2 x 10-6 in./ in. °F Distance between fixed points (L) in feet. Find the loop size for a 6” diameter steel pipe carrying 200°F heating water with 200 ft.

What does an expansion joint do?

1 Functions of Expansion Joint. Bridge expansion joints are designed to adjust its length accommodating movement or deformation by external loads, shrinkage, or temperature variations, and allow for continuous traffic between bridge structures and interconnecting structures (another bridge or abutment).

Why are pipelines not straight?

Oil pipelines are often implemented with seemingly unnecessary bends to allow for expansion and contraction of the flowline or pipeline due to changes in pressure and temperature, which can occur due to changes in the weather conditions, thus they absorb significant static and dynamic loads.

How often are expansion joints needed?

Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.

How fast does oil move in a pipeline?

3 to 8 miles per hour
Oil moves through pipelines at speeds of 3 to 8 miles per hour. Pipeline transport speed is dependent upon the diameter of the pipe, the pressure under which the oil is being transported, and other factors such as the topography of the terrain and the viscosity of the oil being transported.

Why are pipes bent?

Pipe bending allows systems to minimize pressure changes while still routing materials through complex piping systems. As most bent pipes do not alter the ends of the piping, pipe bends are often easy to implement within a processing system using standard welding processes, flanges, or other connection methods.

Where to place expansion loops in a pipe?

If the use of expansion devices is not suitable for the application, you may be able to utilise expansion loops to take up the thermal expansion of the pipework. Loops should always be positioned in the middle of a pipe run, with anchors at the end of each run.

What should the temperature be for an expansion loop?

Design temperature is 370 °F and the ambient temperature at installation is 70 °F. Determine the maximum stress. As the temperature of the fluids in the pipe changes or as the atmospheric temperature changes, the piping system will expand or contract. The temperature of piping will also change if it is steamed out or if it is exposed to fire.

How are expansion loops used in the engineering toolbox?

You can make ads in the Engineering ToolBox more useful to you! The expansion loop is a common way to absorb temperature expansion and contraction in steel pipes. Expansion loops can be fabricated from standard pipes and elbows. This calculator can be used to calculate required width and height of an U-bends expansions compensator.

When to use expansion loops or expansion joints?

The expansion loops are ineffective to use in the application of low pressure or large diameter lines. The construction and installation of the expansion loops require high man-hours. In most cases, using expansion joints is more economical than using expansion loops.

Where is the halfway point for the expansion loop?

This loop should be as near to the halfway point between the two anchors as practical. Our distance between PS #1 and PS # 8 is 175 feet. The halfway point is between PS # 4 and PS # 5. The line will run in the first pipeway berth at the far south side of the unit pipeway.

How many anchor points are needed for an expansion loop?

Hot lines on pipe racks need to be checked for flexibility; therefore, the hot lines must be identified. Determine if one anchor (central) anchor point will suffice. If a single anchor will not work two anchors with an expansion loop must be used, as shown below.