As per Shell DEP 30.10.60.18, the decrease in angle is essentail
variable. What is concept behind it? Is is applicable for Compound/
composite angle joint design also. As per this joint design up to 19
mm the bevel will be 37.5 degrees, later it will be only 10 degres.
My concept is the anlge is only for accessability and in case of DSS,
Nickel alloys higher anlge for better wetting. It should not
applicable for carbon steels.
Please debate on this.
The Clause as per DEP as given below:
11.1 Add new clause 11.1.4 It is the Manufacturer's responsibility to
ensure that
welding operations are carried out in accordance with the
parameters as specified on the qualified WPS. Unless
otherwise specified by local regulations, welding procedures
shall be qualified in accordance with ISO 15607 and/or
ASME IX. Irrespective of the design code, welding procedure
qualifications shall be re-qualified when any of the following
conditions occur:
• Joints
- A change from double sided to single sided welding, or
vise versa (delete) but not the converse;
- A decrease in welding groove angle of more than 10
degrees.
• Consumables
- Any change of consumable classification;
- Any change in consumable brand name when corrosion
testing or impact testing is required;
- Any change in size of more then 1 mm of consumable in
the root run of single sided welds.
• Welding position
Change in welding direction (vertical up to vertical down
welding or vice versa).
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