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Safety Valves Standards

Reference data and engineering information about safety valves standards for fluid mechanics applications.

safetyvalvesstandards

Overview

Engineering reference data for Safety Valves Standards in fluid mechanics.

Key Formulas

Reynolds Number

Re=ρvDμRe = \frac{\rho v D}{\mu}

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

P+12ρv2+ρgh=constP + \frac{1}{2}\rho v^2 + \rho g h = \text{const}

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

A1v1=A2v2A_1 v_1 = A_2 v_2

Conservation of mass for incompressible flow.

Darcy-Weisbach

ΔP=fLDρv22\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}

Pressure drop due to friction in a pipe.

Variables

SymbolDescriptionUnit
ReReReynolds number
ρ\rhoFluid densitykg/m³
vvFlow velocitym/s
DDCharacteristic dimensionm
μ\muDynamic viscosityPa·s
PPPressurePa
ffDarcy friction factor

Safety Valve Standards by Country

19 rows
International safety valve standards and their descriptions
Country
Standard No.
Description
GermanyA. D. Merkblatt A2Pressure Vessel Equipment safety devices against excess pressure - safety valves
GermanyTRD 421Technical Equipment for Steam Boilers Safeguards against excessive pressure - safety valves for boilers of groups I, III & IV
GermanyTRD 721Technical Equipment for Steam Boilers Safeguards against excessive pressure- safety valves for steam boilers group II
United Kingdom, UKBS 6759Part 1 specification for safety valves for steam & hot water; Part 2 specification for safety valves for compressed air & inert gas; Part 3 specification for safety valves for process fluids
FranceAFNOR NFE-E 29-411 to 416Safety & relief valves
FranceNFE-E-29-421Safety & relief valves
KoreaKS B 6216Spring loaded safety valves for steam boilers & pressure vessels
JapanJIS B 8210Steam boilers & pressure vessels - spring loaded safety valves
AustraliaSAA AS1271Safety valves, other valves, liquid level gauges & other fittings for boilers & unfired pressure vessels
USAASME IBoiler applications
USAASME IIINuclear applications
USAASME VIIIUnfired Pressure Vessel Applications
USAANSI/ASME PTC 25.3Safety & Relief Valves - performance test codes
USAAPI RP 520Sizing selection & installation of pressure relieving devices in refineries, Part 1 Design, Part 2 Installation
USAAPI RP 521Guide for pressure relieving & depressurizing systems
USAAPI STD 526Flanged steel pressure relief valves
USAAPI STD 527Seat tightness of pressure relief valves
EuropeEN ISO 4126Safety devices for protection against excessive pressure
InternationalISO 4126Safety valves - general requirements

Source: engineeringtoolbox.com

References