Fiberglass Pipe Thermal Expansion and Contraction

FRP Pipe Properties: Thermal Expansion and Contraction

Beetle Plastics fiberglass pipe is filament wound and, therefore, has different thermal expansion in the hoop and axial direction. In the hoop direction, the thermal expansion is about the same as steel. However, in the axial direction, the thermal expansion of the fiberglass pipe is about twice that of steel.

The relatively low modulus of elasticity of the fiberglass pipe is an advantage which should be considered in the design of a piping system. Since thermal forces are smaller, restraining equipment (guides, anchors, etc.) need not be as strong or heavy as for steel piping. There is some growth due to end load from pressure in the piping system; but experience has shown that this length change does not need to be considered in designing a fiberglass piping system. FRP composite piping systems can handle thermal shocks between maximum rated operating temperatures and -40°F, unless the pipe joints are mechanical joint style.

To determine the effects of expansion and contraction within a piping system, it is necessary to know:

1. The design temperature conditions.
2. The type and size of pipe.
3. The layout of the system including dimensions and the thermal movements, if any, of the terminal
4. points.
5. The limitations on end reactions at terminal points as established by equipment manufacturers.
6. The temperature changes for expansion are calculated by subtracting the installation temperature (temperature at time of final tie in) from the maximum design temperature.

Temperature changesfor contraction are calculated by subtracting the minimum design temperature from the installation temperature. Expansion and contractions of above ground fiberglass pipe may be handled by several different methods.

Four methods are:

1. Direction Changes
2. Anchors and Guides
3. Mechanical Expansion Joints
4. Expansion Loops

Guides, Expansion Loops, and Mechanical Expansion Joints are installed in straight pipelines which are anchored at both ends. The experience of users of FRP composite piping systems has shown that if directional changes cannot be used to accommodate thermal expansion and contraction, then the guide spacing design approach is usually the most economical method.

Operating experience with piping systems indicates that it is a good practice to anchor long straight pipe runs of above group piping at approximately 300-foot intervals. These anchors prevent pipe movement due to vibration, water hammer, etc.. Also, an anchor is used wherever a pipe size change occurs. When joining FRP composite piping to other piping systems, the adjoining system MUST be securely anchored to prevent the transfer of thermal end loads.

Contact us today and we can arrange a test installation in your plant comparing Beetle Plastics abrasion resistant pipe with your current piping and duct materials.

Why choose our FRP pipes and systems?

Underground infrastructures across North America are old, deteriorated, corroded or simply undersized due to aggressive conditions or environmental changes. There are many cities and industries who are struggling to maintain their underground assets at an in-service condition.

Fiberglass reinforced polymer (FRP) pipes are the sustainable alternatives for any kind of pipeline. Some even state that the FRP pipe is among the greener pipes because of the low manufacturing footprint and the design life expectancy of 100 years. Using FRP pipes and systems will reduce the cost of replacement and rehabilitation as well as the cost of maintenance for the entire life cycle of your infrastructure. 

Novinfra and partners are dedicated to manufacture and supply the highest quality FRP pipes with the highest level of service before and after sale. We offer a large range of FRP products for underground, above ground and trenchless applications. Our Circular and non-circular pipes can be designed for pressure or gravity flow condition.

Fiberglass-reinforced plastic (FRP) piping is not required to be provided with flexible joints in locations where both of the following conditions are present:

1. Piping does not exceed 4 inches (102 mm) in diameter.
2. Piping has a straight run of not less than 4 feet (1219 mm) on one side of the connection where such connections result in a change of direction.

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In lieu of the minimum 4-foot (1219 mm) straight run length,andflexible joints are allowed to be used under dispensers and suction pumps, at submerged pumps and tanks , and where vents extend above ground.