QC Notes PIPING FABRICATION
The nature and extend of supervision and inspection during fabrication, installation and testing
shall be agreed between Company, NoBo (if applicable) and Contractor.
The general contents agreed shall be laid down by Contractor in a quality control plan / test and
INSPECTION PIPING PREFABRICATION :
Inspection on prefabrication shall guarantee as a minimum the following items:
check on use correct materials and adherence to material control procedures,
visual examination materials before use,
visual examination fit-up before welding,
inspection on working (incl. welding) per specifications,
visual examination after welding,
inspection on dimensions (both dimensions from drawing as fabrication-results (square,straddled, straight, etc.),
Non Destructive Testing,
Dimensional inspection to drawings,
Inspection as required for Class. Authority for piping where applicable,
Documentation including As Built.
Preparation for coating:
Before blasting / coating can commence, to avoid damage to vulnerable parts (i.e. treads), and
contamination of insides of pipe spools etc. with blasting material, parts shall be protected
(closed or alternative).
For this purpose dedicated materials shall be used (plastic caps, tubes on treaded rods,
neoprene sheets, tape)
No screwed plugs, caps that contain any pressure, shall be used!
INSPECTION PIPING INSTALLATION:
Inspection on installation shall guarantee as a minimum the following items:
inspections as indicated for prefabrication where applicable
handling, transport and storage of spools
strain-free installation of piping
extra attention of closing system to avoid contamination of piping systems and equipment to be connected
Non Destructive Testing field welds
Documentation including As Built.
NON DESTRUCTIVE TESTING:
Welds in piping shall be tested with NDT techniques.
In general the following scheme shall be adhered to.
Welds on piping subject to NoBo approval must be 100 % NDT tested.
Any weld in class 30 and up must be 100 % NDT tested.
Welds on piping not subject to NoBo approval and not in class 30 and up must be as, a minimum,
10 % NDT tested. (all welders on the project must be included in this 10%).
Company reserves the right to select the welds or require additional radiographs.
Types and standards for NDT
NDT shall be done per approved procedures and standards and by qualified personnel (Level II).
Procedures and qualifications shall be based on EN 473, EN 13480, NEN 3650 and NEN 3656, and
shall as a minimum fulfil the NoBo requirements as laid down in the subject sheets. The locations
of the weld examined shall be indicated on a drawing in such detail, that the precise location of
each checked weld can be traced. NDT on a weld will include type of check per table included.
Radiographic: The most stringent technique and acceptance criteria shall be used.
All indications shall be reported.
NDT on welds CS and Duplex:
– In all applications NDT-results must give clear view on the quality of the weld to be examined.
If necessary NDT-technique will be adapted to suit this goal.
– For SS-types (including Duplex) MPI will be replaced by Dye-Penetrant Inspection.
– Radiography implies the use of only X-ray tests. Gamma-ray tests may, in specific cases, be
accepted by an approved procedure. Cobalt-60 isotopes shall not be used.
* Weldolets one exposure supported with 100% magnetic particle / dye penetrant examination.
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