This European Standard specifies requirements for the design, manufacture and testing of closed expansion
vessels with built in diaphragm, which will hereinafter be called "vessels", and
a) whose diaphragm serves to separate water on the one hand and air / nitrogen on the other hand in
heating/cooling systems or fresh water systems;
b) which are manufactured singly or in series;
c) which may consist partly or entirely of (cold) deep-drawn parts;
d) whose parts may be joined by welding, clenching or flanges;
e) whose size is not limited;
f) whose maximum allowable pressure is greater than 0,5 bar, yet not exceeding 30 bar;
g) whose upper wall thickness is limited to 12 mm for austenitic steels and 15 mm for ferritic steels;
h) whose minimum operating temperature is not below –10 °C and whose maximum operating temperature
is not above 70 °C.
NOTE The maximum operating temperature of 70 °C is determined by the characteristics of the diaphragm materials.
It may be higher, if suitability of diaphragm material is proven.
Whatever the temperature in the heating system, for the vessel operation the decisive factor is the maximum operating
temperature of the diaphragm. It is the system designer's responsibility to prescribe measures to protect the diaphragm
from unsuitable temperatures (e.g. connection to the coldest part of the system in a heating system, to the warmest in a
refrigeration circuit; thermostatic monitoring of connection to vessel or intermediate vessel).
For cases where operating temperatures above 70 °C cannot be avoided the suitability of the diaphragm material is to be
proven (see Clause 8).
When reference is made in this European Standard to EN 13445-1, EN 13445-2, EN 13445-3, EN 13445-4
and EN 13445-5 respectively, all relevant provisions in the concerned clauses of these standards need to
apply.
BS EN 13831:2007 Referenced Document
EN 10204:2004 Metallic products - Types of inspection documents*， 2024-04-18 Update
EN 10269:1999 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties Incorporating corrigendum April 2000, June 2000, July 2006 and October 2008; Incorporates Amendment A1: 2006
EN 13445-4:2002 Unfired pressure vessels - Part 4: Fabrication
EN 13445-5:2002 Unfired pressure vessels - Part 5: Inspection and testing [Superseded: BSI BS EN 13445-2, BSI BS EN 13445-2, BSI BS EN 13445-2, BSI BS EN 13445-2, BSI BS EN 13445-2]
EN 1418:1997 Welding Personnel - Approval Testing of Welding Operators for Fusion Welding and Resistance Weld Setters for Fully Mechanized and Automatic Welding of Metallic Materials
EN 1435:1997 Non-destructive testing of welds Radiographic testing of welded joints Includes amendments A1:2002 and A2:2003
EN 287-1:2004 Qualification test of welders - Fusion welding - Part 1: Steels Incorporating Corrigendum August 2004; Includes Amendment A2:2006
EN 473:2000 Non-Destructive Testing - Qualification and Certification of NDT Personnel - General Principles includes amendment A1:2005; Supersedes CR 12459:1996*， 2024-04-18 Update
EN 764-1:2004 Pressure equipment - Part 1: Terminology - Pressure, temperature, volume, nominal size Supersedes EN 764:1994
EN 764-2:2002 Pressure Equipment - Part 2: Quantities, Symbols and Units
EN 764-3:2002 Pressure Equipment - Part 3: Definition of Parties Involved
EN 895:1995 Destructive Tests on Welds in Metallic Materials - Transverse Tensile Test
EN 910:1996 Destructive Tests on Welds in Metallic Materials - Bend Tests
EN ISO 898-1:1999 Mechanical Properties of Fasteners Made of Carbon Steel and Alloy Steel - Part 1: Bolts, Screws and Studs ISO 898-1:1999; Supersedes EN 20898-1: 1991
BS EN 13831:2007 history
0000 BS EN 13831:2007(2008)
2007BS EN 13831:2007 Closed expansion vessels with built-in diaphragm for installation in water
1990BS 4814:1990 Specification for expansion vessels using an internal diaphragm, for sealed hot water heating systems