1. (a) Strength. The applicant must establish by test, validated analysis, or a combination of both, that all static parts subject to significant gas or liquid pressure loads for a stabilized period of one minute will not:

   1. (1) Exhibit permanent distortion beyond serviceable limits or exhibit leakage that could create a hazardous condition when subjected to the greater of the following pressures:

      1. (i) 1.1 times the maximum working pressure;
      2. (ii) 1.33 times the normal working pressure; or
      3. (iii) 35 kPa (5 p.s.i.) above the normal working pressure.

   2. (2) Exhibit fracture or burst when subjected to the greater of the following pressures:

      1. (i) 1.15 times the maximum possible pressure;
      2. (ii) 1.5 times the maximum working pressure; or
      3. (iii) 35 kPa (5 p.s.i.) above the maximum possible pressure.

2. (b) Compliance with this section must take into account:

   1. (1) The operating temperature of the part;
   2. (2) Any other significant static loads in addition to pressure loads;
   3. (3) Minimum properties representative of both the material and the processes used in the construction of the part; and
   4. (4) Any adverse geometry conditions allowed by the type design.

[Amdt. 33-27; 73 FR 55437, Sept. 25, 2008; Amdt. 33-27, 73 FR 57235, Oct. 2, 2008]