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This specification covers the minimum requirements for the pressure-temperature rating, testing, and making of pressure-containing vessels for entrainment separators. Entrainment separators covered in this specification shall be designed according to the lowest pressure-temperature rating of any individual component, or as established by proof tests. Test water temperature and entrainment separator temperature must be at equilibrium before hydrostatic test pressure is applied. All possible air pockets must be purged while the entrainment separator vessel is being filled with water. External equipment not to be pressurized with the entrainment separator should be isolated or disconnected before applying the hydrostatic test pressure. Hydrostatic test pressure shall be applied gradually to the entrainment separator and held stationary at each increment for a sufficient time in order that a visual inspection can be made for leaks or deformation of the vessel.