Occasional Load

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  1. Occasional Load Case
  2. Occasional Loading
Piping stress analysis can use code ASME B31.1 as reference calculation and design. Code ASME B31.1 for power piping analysis is belonging to the American society of mechanical engineers. In code ASME B31.1 there are empirical formulas that apply to the sustain load, expansion load, and the combination of sustain and expansion load (during operations), and also occasional load are described as the following below:

Occasional load stresses in piping systems are the some of those stresses caused by loads such as relief valve discharge, wind and earthquake. These are calculated considering the: a. Pipe deflection caused by wind load acting as a horizontal constant pressure on the outside surface of pipe. Occasional loads are primary loads. When combined with Sustained load stress SL, the design will pass when (SL + SOcc)occasional loads, winds and earthquake need not be considered acting concurrently. First of all, let’s explain what running a generator off load means. It means running the generator without any building or load bank load so the generator effectively is running on idle. Whilst good to ensure the generator is able to start and run correctly without any issues, if only run off load, it can lead to wet stacking.

Re: Occasional Loud buzzing noise from Samsung electric dryer model# DV42H5000EW/A3 JUMP TO SOLUTION ‎ 02:31 PM - last edited on ‎ 07:49 AM by SamsungNik. The wall thickness of pipe is nearly always selected based on the thickness required for internal pressure and allowances. The piping is then supported sufficiently such that the longitudinal stress (this is the stress in the axial direction of the pipe) is within Code limits and deflection is within acceptable limits.

  1. Sustain load
The stresses (S) that occur due to sustain the load such as pressure, weight and other mechanical loads can be expressed by the equation as follows:
(P Do / 4 tn) + 1000(0.75 i Ma / Z) ≤ 1.0 Sh
  1. Range Thermal Expansion Load
The stresses that occur due to thermal expansion can be expressed as the equation below:
SE = 1000(i Mc / Z) ≤ SA + f(Sh – SL)
  1. Combination Load of Sustain load and Thermal Expansion Load
The stresses due to combination of sustained load and thermal expansion load (Sls + SE), can be calculated with the equation:
Sls + SE = (P Do / 4 tn) + 1000(0.75 i Ma / Z) + 1000(i Mc / Z) ≤ (Sh + Sa)
  1. Occasional Load

Occasional Load Case

The stresses that occur due to pressure, weight, and other sustain load can be expressed as the equation below:
(P Do / 4 tn) + 1000(0.75 i Ma / Z) + 1000(i Mc / Z) ≤ K Sh

P = internal design pressure (psi)
Occasional loader

Occasional Loading

Ma = Moment due to sustain load (in-lbs)
Mc = Range of the moment due to thermal expansion (in-lbs)
tn = nominal wall thickness of pipe (in)

K equal to 1.15 for the occasional load which work less than 1% of the operating period and is equal to 1.20 for the occasional load which work less than 10% of the operating period.

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