3.1 Classification of requirements.
The requirements for the valve are
classified as follows:
and product characteristics
Operational service life
3.2 General requirements
3.2.1 Preproduction sample. Unless otherwise specified in the
contract or purchase order, a preproduction sample of the valve shall
be manufactured using the methods and procedures proposed for production.
The sample will be tested as specified in Section 4 herein and is for the
purpose of determining, prior to starting production, that the contractors
production methods are capable of yeilding items that comply with the
technical requirements of the contract.
18.104.22.168 Materials and treatments of materials. Unless otherwise
specified in the contract or purchase order, all materials and treat-
ments of materials and parts used in the manufacture of the valve shall
be in accordance with the applicable documents listed on NAVSEA Dwg 2526708.
22.214.171.124 Metals. Metals shall be of the corrosion-resistant type
or shall be adequately protected to resist corrosion during the normal
storage and service life of the valve. Unless suitably protected against
electrolytic corrosion, dissimilar metals as defined in MIL-STD-889 shall
not be used in intimate contact.
Definitions of terms appear in Section 6.
3.3 Performance requirements and product characteristics. Un-
less otherwise specified, the valves shall satisfy the following per-
formance requirements when tested as specified in Section 4:
3.3.1 Leakage at proof pressure. The valve shall be capable of with-
standing a maximum internal pressure of 4500 pounds per square inch gage
(psig) without leaking and without sustaining permanent distortion.