Linear expansion compensation  - Traditional

When designing linear expansion compensation for TERMOTECH Duroplasty pipeline systems in a traditional manner, following two basic issues should be considered: 

  • correct calculation of ΔL expansion

  • proper planning of fixed point arrangement - P.S.

  • proper designing of Lp spacing between moving supports - P.R.

  • ensuring minimum compensation arms H

 

The traditional linear expansion compensation methods include:

"U-shape" expansion joint

 

"Z-shape" expansion joint

 

kompensacja U-kształtna "Z-shape" expansion joint

 

Spacing of Lp moving supports for traditional compensation, m

Spacing of Lp moving supports for traditional compensation, m

 

Length of compensation arm H depending on expansion, m

Length of compensation arm

Linear expansion compensation - self-compensation

Self-compensation is a relatively new term and refers only to pipelines built in this method. Our conduit pipes made of GRP are wound by cross method which results in linear contraction of pipes. Thanks to this phenomenon, they are highly resistant to hammering and can be used for building self-compensating pipelines. One should remember about application of only guide and fixed supports.

The maximum permissible elongation for a pipeline made with using self-compensation should not exceed 0.2%.

Spacing of guide supports Lps for a self-compensation application, m

Spacing of guide supports  Lps

In case of self-compensation, adequate selection of support spacing is of crucial importance. Incorrect approach to this phenomenon may result in the incorrect operation of a pipeline leading to its destruction.

Below are some drawings to illustrate the importance of this issue.

Incorrectly adopted spacing between guide supports

Incorrectly adopted spacing between guide supports

Correctly adopted spacing between guide supports

Correctly adopted spacing between guide supports

 
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