Transcription of PRESSURE SAFETY RELIEF VALVES
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PRESSURE SAFETY RELIEF VALVES
PRESSURE SAFETY RELIEF VALVESTECHNICAL BULLETIN 3 PRESSURE SAFETY RELIEF VALVES TECHNICAL BULLETIN 3-I TECHNICAL BULLETIN 3-I PRESSURE SAFETY RELIEF VALVES 1 0. FOREWORD This technical bulletin is dedicated to those PRESSURE relieving devices which fall within the definition of direct-loaded SAFETY VALVES , produced by PARCOL since the beginning of the Seventies. The information contained in this document derive from PARCOL experience and internal instructions and are basically in accordance with the international standards listed in the following paragraph. 1. NORMATIVE REFERENCE API STANDARD 520 Part I (2008), Sizing, Selection and Installation of PRESSURE -relieving Devices in Refineries Sizing and selection API RECOMMENDED PRACTICE 520 Part II (2003), Sizing, Selection and Installation of PRESSURE -relieving Devices in Refineries Installation API STANDARD 526 (2009), Flanged Steel PRESSURE - RELIEF VALVES API STANDARD 527 (1991), Seat tightness of PRESSURE - RELIEF VALVES ISO 4126-1 (2004), SAFETY devices for protection against excessive PRESSURE SAFETY VALVES ISO 4126-7 (2004), SAFETY devices for protection against excessive PRESSURE Common data ISO 4
The valve disc balancing is necessary when a variable or unpredictable back pressure exists, as for instance in petrochemical plants where all ... being the bellows subject to rupture under heavy duties (i.e. with steam at high temperature and pressure or due to wrong valve installation on
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