BS ISO 15364:2016 pdf download – Ships and marine technology — Pressure/vacuum valves for cargo tanks 5.2 Non-metallic materials, other than gaskets, seals and diaphragms as allowed by 6.11, shall not be used in the construction of pressure retaining components of the device. Resilient seals may be installed only if the device is still capable of effectively performing its flame arresting function when the seals are worn down, partially or completely damaged or burned. Non-metallic gaskets shall be made of non- combustible material and suitable for the service intended. 5.3 Materials for connecting pressure-vacuum valves to their respective piping systems should meet standards for physical characteristics similar to those of the piping systems to which they are connected. 5.4 The possibility of galvanic corrosion shall be considered in the selection of materials (see Annex D for additional considerations). 5.5 The verified drawings shall include a complete bill of materials showing conformity with this subclause and any other material requirements listed in Clause 6. 6 Other requirements 6.1 The maximum gas leakage rate shall be provided and expressed as the volume in standard air that may leak from the valve at 75 % of the nominal setting as determined by the manufacturer. See Annex I for suggested leakage rates. 6.2 Housings, elements, and seal gasket materials shall be capable of withstanding the maximum and minimum pressures and temperatures to which the device may be exposed under normal operating conditions. 6.3 Where welded construction is used for pressure retaining components, welded joint design details, welding and non-destructive testing shall be in accordance with National or International Standards. Welding procedures should be in accordance with the ISO 15607 series. Welders should be qualified according to the ISO 9606 series. Non-destructive testing should comply with ISO 5817. Alternative equivalent National/International Standards may be used. 6.4 End-of-line pressure-vacuum valves shall be designed, such that condensed vapour and water in the pressure-retaining zone drain from the device into the tank and do not impair the efficiency of the device. The design shall also prevent the accumulation of water inside the device and subsequent blockage due to freezing. The design shall prevent pockets of water or product from accumulating. 6.5 All fasteners essential to the operation of the device shall be protected against loosening. 6.6 Devices shall be designed and constructed to minimize the effect of fouling under normal operating conditions. 6.7 Devices shall be capable of...

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