API SPEC 14D:1994 pdf download.Specification for Wellhead Surface Safety Valves and Underwater Safety Valves for Offshore Service
301. PERFORMANCE REQUIREMENTS.
301.1 GENERAL. Surface Safety Valves (SSV) and Underwater Safety Valves (USVl designed and manu- factured in accordance with this Specification shall be constructed of materials in compliance with Section 400 of this Specification and shall perform satisfactorily in the tests required by Section 900 of this Specification. The SSV/uSV shall be of a normally closed design. The SSV/USV shall be designed to operate, without damage to the SSV/USV valve or SSV/USVactuator, when SSVI USV actuator energy is instantaneously applied or lost under any condition of SSVIUSV valve body pressure within its pressure rating. Design criteria for USV’s shall also include the maximum water depth. 301.2 RELATED SPECIFICATIONS. In addition to the requirements of this section, a SSVIUSV valve must comply with the applicable dimensional requirements of API Spec 6A. SOl.3 SSVVALVE DESIGN. This Specification covers flanged valves, or valves with other industry accepted non-threaded end connections, and multiple completion or block type valves used as wellhead surface safety valves. A multiple completion or block type valve will qualify as a wellhead SSV for Class 2 service, without verification testing, if it is of the same internal design as an SSV valve within the manufacturer’s productline, which has passed the verification test in Section 900 of this Specification. Such valves must be manufactured and supplied in accordance with all other requirements of this Specification. 301.4 USV VALVE DESIGN. USV valve designs must meet the requirements for SSV valve design with the following exceptions: (l) USV valves may use any stand- ard or other industry accepted end connections. (2) USVs may be of nonstandard bores and/or end-to-end lengths. End connections which are not specified in API Spec 6A shall meet all other requirements of this Specification.
305. DESIGN DOCUMENTATION. Documentation of designs aha1l include methods, assumptions, calculations, and. design requirements. Design requirements shall include, but not be limited to, thosecriteriafor size, test, and operating pressures, material environmental and API Specification requirements, and other pertinent re- quirements upon which the design is to be based. Design documentation media shaD be clear, legible, reproduc- ible, and retrievable. Design documentation shall be re- tained for five (5) years after the last unit of that design is manufactured.
API SPEC 14D:1994 pdf download
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