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Welding Procedure Qualification (WPQR) for Pressure Vessels EN 13445 series

The approval of welding procedure qualifications (WPQR) is usually based on a harmonised standard such as EN ISO 15614-1. However, if it is based on another document, the PED should be explicitly mentioned in the document. This must be approved for category II, III and IV pressure equipment by a notified body or a recognised organisation third-party testing body. To carry out these approvals the third party must perform examinations and tests as set out in the appropriate harmonised standards or equivalent examinations and tests or shall have them performed.

The properties of welded joints shall meet the minimum properties specified for the materials to be joined unless other relevant property values are specifically taken into account by the design process, also the impact property values shall meet the specified minimum properties of the materials joined.

When is a welding procedure qualification (WPQR) required?

When the weldment can create a pressure hazard on the pressure bearing component. Examples of welding operation for which qualification is required according to Annex I section 3.1.2 include:

  • Welding of all circumference and longitudinal seams of the housing
  • Welding of all nozzle welds
  • Welding of tube to tube-sheet welds of heat exchanger
  • Welding of a lifting lug on a pressure bearing chamber;
  • Welding of an attachment to a valve body;
  • Welding of reinforcing pads for nozzles;
  • Repair by welding on a chamber before placing on the market;
  • Major welding on a casting during production.

Examples of welding operations for which qualification is required according to Annex I section 3.1.2, unless the hazard analysis demonstrates that there is no pressure hazard, include:

  • Minor welding on a casting during production;
  • Buttering of a tube-sheet;
  • Overlay welding on a pressure chamber (anticorrosive, wear coating…).

Table: List of Welding Procedure Qualifications (WPQR) for Pressure Vessels including Heat exchangers

WPQR
Standard
Steel
Pressure Vessel
EN 13445-4
Spheroidal graphite cast iron Pressure Vessel
EN 13445-6 + A1
Aluminium
Pressure Vessel
EN 13445-8
Nickel
Pressure Vessel
EN 13445-10
Titanium
Pressure Vessel
EN 13445-11
Copper
Pressure Vessel
EN 13445-12
EN ISO 15610
(based on tested welding consumables)
not applicablenot applicablenot applicablenot applicablenot applicablenot applicable
EN ISO 15612:
(Standard welding procedure specification (SWPS) based on welding procedure qualification tests)
EN ISO 15612:
Only material group 1.1, 1.2,1.3 8.1 and 11.1 and steel material thicknesses t ≤ 50 mm;
welds made directly on pressure vessels;
Not pressure-bearing parts such as support rings, supports, saddles;
not applicableEN ISO 15612: Only material group 21, 22.1 and 22.2;
welds made directly on pressure vessels;
Not pressure-bearing parts such as support rings, supports, saddles;
not applicablenot applicablenot applicable
EN ISO 15613
(pre-production welding test)
EN ISO 15613:
alternate to WPQR
EN 15614-1;
additional requirements EN 13445-4 par. 9.2
not applicablenot applicableEN ISO 15614-1:
additional requirements
EN 13445-4 par. 9.2 +
EN 13445-10 Par. 7.6
not applicablenot applicable
EN ISO 15614-1
(steels and nickel and nickel alloys)
EN 15614-1: additional requirements EN 13445-4 par. 7.not applicablenot applicableEN ISO 15614-1:
additional requirements
EN 13445-4 par. 8.3 +
EN 13445-10 Par. 7.2
not applicablenot applicable
EN ISO 15614-2
(Aluminium and aluminium alloy)
not applicablenot applicableEN ISO 15614-2 additional requirements
EN 13445-4 par. 8.3
not applicablenot applicablenot applicable
EN ISO 15614-3
(Fusion welding of non-alloyed and low-alloyed cast irons)
not applicableEN ISO 15614-3
additional recommended EN 1011-8
not applicablenot applicablenot applicablenot applicable
EN ISO 15614-4
(Finished Welding of Aluminium Casting)
not applicablenot applicableEN ISO 15614-4
additional requirements
EN 13445-4 par. 8.3
not applicablenot applicablenot applicable
EN ISO 15614-5
(Titan and zirconium)
not applicablenot applicablenot applicablenot applicableEN ISO 15614-5 (Titan and zirconium)
+
Additional requirements
EN 13445-11
not applicable
EN ISO 15614-6
(Copper and copper alloy)
not applicablenot applicablenot applicablenot applicablenot applicableEN ISO 15614-6
+
Additional requirements
EN 13445-11
EN ISO 15614-7
(Overlay welding)
EN ISO 15614-7,
if required
not applicableEN ISO 15614-7,
if required
EN ISO 15614-7,
if required
EN ISO 15614-7,
if required
EN ISO 15614-7,
if required
EN ISO 15614-8
(Tubes to tube-plate joints)
EN ISO 15614-8,
‘if required
EN ISO 15614-8,
not applicable
not applicableEN ISO 15614-8,
if required
EN ISO 15614-8,
if required
EN ISO 15614-8,
if required

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ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

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