BS EN ISO 27509:2020 pdf free.Petroleum and natural gas industries —Compact flanged connections with IX seal ring.
BS EN ISO 27509 This document specifies detailed manufacturing requirements for circular steel and nickel alloy compact flanged connections and associated seal rings, for designated pressures and temperatures in class designations CL 150 (PN 20] to CL 1500 (PN 260] for nominal sizes from DN 15 (NPS 3/2) to DN 1200 (NPS 48), and for CL 2500 (PN 420) for nominal sizes from DN 15 (NPS /2) to DN 600 (NPS 24).NOTE NPS is expressed in accordance with ASME B36.10M and ASME B36.19M.This document is applicable to welding neck flanges, blind flanges, paddle spacers and spacer blinds (paddle blanks), valve/equipment integral flanges, orifice spacers, reducing threaded flanges and rigid interfaces for use in process piping for the petroleum, petrochemical and natural gas industries.This document is applicable within a temperature range from -196。C to +250 °C.This document is not applicable for external pressure.be designed for face-to-face make-up for transfer of the bolt loading through the flange faces; be designed so that a static mode is maintained in the bolted joint up to 1,5 times the specified pressure/temperature rating, see 8.2. Static mode is maintained as long as the difference between maximum and minimum nominal stress sustained by the bolts in the joint does not exceed 5 % of the minimum values specified in Table 3;be standardized to cover as a minimum the same pressure temperature class designations and sizes as can be found in ASME B16.5 with equal or better performance;be standardized to fit with commonly used standards by the valve industry [e.g. ASME B16.34, ISO 14313 and EN 12516 (all parts)], and other valve standards which make reference to these standards for pressure design; conform with the applicable requirements in the piping or pressure vessel code agreed between the supplier and the purchaser.The weakest part of flanged connections in accordance with this document regarding fatigue failure is always located somewhere in the transition from flange to pipe or flange to nozzle neck of an equipment or valve. The bolted joint itself is never subjected to fatigue load if considerations to cycling temperatures are taken when selecting bolt material, see 7.3.BS EN ISO 27509 pdf downlaod.