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Pressure relief valves

  • Supported calculation standards:

ISO 4126-1 (2016) 
ISO 4126-7 (2016) 
ISO 4126-9 (2008)

ISO 4126-10 (2019, 2010) 
API 520 (2020) 
API 521 (2020) 
API 526 (2017)

ASME BPVC Section VIII (2021, 2011) 
AD Specification A2 (2015) 

  • The calculation of the built-up back pressure of the discharge pipe with up to four pipe extensions and the pressure loss of the feeding pipe according to ISO 4126-9
  • Database containing the most common safety valve manufacturers for fast, automatic selection
  • The calculation of two-phase systems including flashing liquids according to ISO 4126-10 and API 520
    (ω-method and direct integration supported)
  • The calculation of reaction forces and the noise level for gases according to ISO 4126:9
  • Fire case calculation for the subsequent flow according to API 521
  • The calculation of an upstream rupture disc is provided
  • Aside of the option to select relief valves out of a database with manufacturer devices, there is now an option to select relief valves according to API 526.
  • Pressure rating for the flanges of the relief valves according to: EN 1092, ASME B16.5, API 526

Rupture discs

  • Sizing and calculation is done according to the following standards:

ISO 4126-2 (2018)
ISO 4126-10 (2019, 2010) 
API 520 (2020) 

ASME BPVC Section VIII (2021, 2011) 
AD 2000 Specification A1 (2006)

  • Sizing and calculation of rupture discs according to the flow resistance method and the coefficient of discharge method.
  • Calculation of the maximum allowable working pressure in consideration of the maximum working pressure, manufacturer range, burst tolerance, backpressure and maximum pressure operating ratio. Rough estimate of the temperature dependency of the burst pressure.
  • The calculation of two-phase systems including flashing liquids according to ISO 4126-10 and API 520
  • Rupture discs can be selected form a manufacturer database, filtered by size, conditions, temperature and pressure limits.