Partial Factors for Temperature 1, 2, ... 9 - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies the partial factor for temperature. Because each operating temperature needs an A1 factor, you may need to specify up to 9 factors if all 9 operating temperatures are defined in a model. If you do not define these values, the software uses the default value of 1.0. The maximum value is 1.0.

The following passage is from ISO14692-3:2002(E) section 7.4.2 Design Temperature.

The effect of temperature on reduction of mechanical properties shall be accounted for by the partial factor A1, which is determined according to Annex D in ISO 14692-2:2002.

The maximum operating temperature of the piping system shall not exceed the temperature used to calculate the partial factor A1 of the GRP components. If the operating temperature is less than or equal to 65°C, then A1 is generally equal to 1.0

The effect of low temperatures on material properties and system performance shall be considered. For service temperatures below 0°C, the principal should consider the need for additional testing, depending on the resin system. Both qualification as well as additional mechanical tests should be considered.

Glass Reinforced Plastic GRP materials do not undergo ductile/brittle transition within the temperature range of this part of ISO 14692. Because of this, there is no significant abrupt change in mechanical properties at low temperatures. A concern is that at temperatures lower than –35°C, internal residual stresses could become large enough to reduce the safe operating envelope of the piping system.