Welding Fabrication Standards - EWF

Welding Fabrication Standards Page 49
Requirements
Permitted materials
(CR ISO 15608)
Testing group and subgroup
1 a 1 b 2 a 2 b 3 a 3 b 4
1 to 10
1.1, 1.2,
8.1
8.2, 9.1,
9.2, 9.3, 10
1.1, 1.2, 8.1
8.2, 9.1,
9.2, 10
Extent of Visual inspection 100% to the maximum possible extent
Extent of NDT for governing
welded joints
100%
100% on first item, 10%
after satisfactory
experience
1.1, 1.2,
8.1
1.1, 8.1
25% 10% 0%
NDT of other welds A specific reference table is given in the standard (Table 6.6.2-1)
Joint coefficient (to be used
for design)
1 1 0,85 0,7
Maximum thickness for
each material
Welding process
No additional
requirements due
to testing
No additional
requirements due
to testing
gr. 9.1, 9.2:
30 mm
gr, 9.3, 8.2*
10: 16 mm
gr. 1.1, 8.1:
50 mm
gr, 1.2:
16 mm
Fully mechanised or
automatic welding
processes
No additional requirements due
to testing
No additional requirements due
to testing
Service temperature range No additional requirements due to testing
gr. 1.1:
-10÷200°C
gr. 8.1:
-50÷500°C
* 30 mm for group 8.2 material is allowed if delta ferrite containing welding consumables are used for
depositing filling passes up to but not including the capping
Table 11 – Testing groups and relevant requirements
4.7 EN 13445 – 6: specific requirements for pressure vessels and parts
made of spheroidal graphite cast iron
This Part specifies that the Manufacturer shall select a testing factor of 0,8 (visual inspection only)
or 0,9 (NDT inspection) when a cast pressure vessel or cast part is designed for pressure up to 50
bar and a maximum temperature of 300 °C.
As concerns welding, no production or repair welding shall be carried out on spheroidal graphite
cast iron parts.
Concerning component design, the DBF method is generally followed considering appropriate
formulae to limit stresses up to safe values. These formulae are generally intended for
predominantly static loads, which means for a number of load cycles not exceeding 200 000 in the
case of spheroidal graphite cast iron. However, a method for design by experiment up to 6000 bar
x l without calculation is given.
Inspection and testing requirements are as in Part 5 except requirements for castings and test
pressure. Interaction between good design and good workmanship is so important for cast vessels
that special requirements are laid down in this Part.
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