UA-69298255-1 UA-69298255-2 Blog Little P.Eng. for Engineers Training

June 4, 2020

Under certain circumstances, specifications may recommend that the relative load change be minimized, by limiting the Load Variation to a value such as 10% or 25%. Load Variation is defined as: 

Since the hot load and thermal movement are dictated by the pipin...

June 4, 2020

A less expensive alternative is a variable spring hanger, in which the spring load varies somewhat as the pipe moves. From the analysis of the system shown in Figure 2-12 it was evident that some change in the support loads as the pipe goes from the cold to the hot con...

June 4, 2020

As seen in Section 2.2 located at (Piping Design for Loading Types), as more restraint is provided to a piping system, weight stresses decrease. Conversely, Section 2.3 located at (Piping Design for Loading Types) demonstrated that as restraint is removed from a system...

June 4, 2020

Often expansion stress problems are due to the use of fittings with large stress intensification factors (SIF). In these cases, it may be possible to upgrade fittings to those with lower SIF values. For example, miters can be upgraded to bends, which can be further upg...

June 4, 2020

The concept that addition of expansion loops reduces the expansion stress range in a system is recognized by the B31.3 code (and others). This is codified in the requirement that expansion analysis need not be explicitly done for a system meeting the following conditio...

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