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95/700260 DC : DRAFT JAN 1995

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

PREN 1268-1 - SAFETY DEVICES FOR THE PROTECTION AGAINST EXCESSIVE PRESSURE - PART 1: SAFETY VALVES
Withdrawn date

23-07-2013

Published date

23-11-2012

1 Scope
2 Normative references
3 Definitions
  3.1 Safety valve
  3.2 Pressure
  3.3 Lift
  3.4 Flow area
  3.5 Flow diameter
  3.6 Discharge capacity
  3.7 Notified body
  3.8 Inspection authority
  3.9 Nominal size
4 Design, materials and construction
  4.1 General
  4.2 End connections
  4.3 Materials
5 Integrity testing in the factory
  5.1 Purpose
  5.2 General
  5.3 Hydraulic test
  5.4 Pneumatic testing
  5.5 Adjustment of cold differential test pressure
  5.6 Seat leakage test
6 Operating and flow characteristic tests
  6.1 General
  6.2 Operating characteristics
  6.3 Flow characteristics
  6.4 Determination of coefficient of discharge
  6.5 Certification of valves
7 Determination of safety valve performance
  7.1 Determination of coefficient of discharge K[d]
  7.2 Critical and subcritical flow
  7.3 Discharge capacity at critical flow
  7.4 Discharge capacity for any gas at subcritical flow
  7.5 Discharge capacity for liquid
8 Sizing of safety valves
  8.1 Valves for gas and vapour
  8.2 Calculation of capacity
9 Marking and sealing
  9.1 Marking on the body of a safety valve
  9.2 Marking on an identification plate
  9.3 Sealing of a safety valve

Committee
PVE/12
DocumentType
Draft
PublisherName
British Standards Institution
Status
Withdrawn

Standards Relationship
PREN 1268-1 : DRAFT 1994 Identical

ISO 1083:2004 Spheroidal graphite cast irons - Classification
ISO 5922:2005 Malleable cast iron
PREN 1092-1 : DRAFT 2016 FLANGES AND THEIR JOINTS - CIRCULAR FLANGES FOR PIPES, VALVES, FITTINGS AND ACCESSORIES, PN DESIGNATED - PART 1: STEEL FLANGES
ISO 7-1:1994 Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation
ISO 185:2005 Grey cast irons Classification

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