Is there a design standard for thermoplastic fabrications?
There is no United States design standard. However, Allegheny uses the German thermoplastic design criteria in the DVS-2205 along with a finite element stress analysis that we have developed. The DVS-2205 specifies the design criteria based on the design temperature, creep modulus, allowable weld strengths, corrosion factors, etc. All polypropylene designs are engineered to meet the required service conditions using our conservative methods. What is the maximum temperature that polypropylene can withstand? Engineering and design criteria is available that permits the design of polypropylene equipment up to 100 C (212 F). Allegheny has designed tanks for hydrochloric acid pickling that have been operating in this temperature range continuously since 1988. However, the maximum operating temperature is a function of the solutions in the tanks, the size (depth) of the tank, and the ability to reinforce the tank to keep the design with in the allowable stress levels required. Because of the
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