Receipt, Inspection and Issue of Pipe and Fittings
When the components are received at the construction yard warehouse, they are unpacked and laid out on a bench for inspection for transit damage, rust, etc.
Some Images of Pipe and Fittings from HBXSR are shown below:
The certification is reviewed by a Quality Control Inspector and, if this is in order, the components are given a Unique Identification Number (UIN). This will start with the type of component: P for piping and F for fittings. The next number is the contract number of the structure the piping and fitting have been ordered for (there can be three or four contracts running at any time). This is followed by a sequential UIN number 001 onwards.
This number is marked on the pipe and fittings with indelible ink, and also written onto the certification pertaining to the component. The certification is then filed, and handed over to the client, forming part of the structures certification at sailaway.
The components are then entered into a computer database with their description, the total received, and the UIN.
When the components are required for fabrication, the fittings and pipe are called out from the warehouse by drawing number.
UIN’s are noted against the drawing number, and then written against the actual component in the drawing, by the pipefitting supervisor. Once fabricated the pipeline is physically checked by the Quality Control inspector and signed as being correct. The drawing is then passed back to the drawing office, where a copy is produced showing the UIN’s against the components.
This drawing then forms part of the certification package, ensuring full traceability right back to the original cast mill certification, as required by the ISO documentation.
A typical isometric drawing is shown below:
I was a production engineer for some time, at an offshore construction yard, and we followed this system and specifications to the letter, as no certification meant that the pipeline was scrapped. It was shown to operate correctly when on one contract we had fabricated over half of the pipelines, only to be told by the pipe supplier that their pipe had not been heat-treated correctly.
The contractor would supply us with replacement pipe, but there was a three week delivery and as the pipe had to be fabricated, painted, installed and pressure tested as the structure was being fabricated, this would cause a major delay to the contract. We decided to heat treat the fabricated pipelines and got the piping supplier's representative on site to supervise the heat treatment of the pipe in one of our large furnaces.
We had to cut all the fittings of the pipe as these were already heat treated, then put the pipes in the furnace.
We then refitted the fittings to the pipe as per the drawings which showed their UIN. It was a nightmare, but we managed to complete the exercise working twelve hour dayshift and nightshifts, over Christmas and the New Year holiday period.