Standard of Pipe in a new condition
Standard of Pipe in a new condition
(OP)
Dear all friends,
We have a contract to Built a Boiler Cap. 110 t/h complete with its supporting equipment and pipe lines with a local contractor. We are now in phase constructions and some materials already in site. We had a problem when pipes come in site, while we inspected them by visual, mostly pitting corrosion appear on internal pipes surface.We said to pipe supplier,that we rejected many pipes caused of corrosion pitting. However, the supplier could not accept our argument,and judge that conditions were normal, and denied to subtitute with other new ones, and . Now, we are in conflict due to we have no standars parameter to judge whether the pipes shall be accepted or rejected. At present I just refer to new contions means everything is smooth. In accordance with my problem, for to you all, please help me to give advices.
Appreciate for your attention.
Thanks and Regards
Ari Dwikoranto
We have a contract to Built a Boiler Cap. 110 t/h complete with its supporting equipment and pipe lines with a local contractor. We are now in phase constructions and some materials already in site. We had a problem when pipes come in site, while we inspected them by visual, mostly pitting corrosion appear on internal pipes surface.We said to pipe supplier,that we rejected many pipes caused of corrosion pitting. However, the supplier could not accept our argument,and judge that conditions were normal, and denied to subtitute with other new ones, and . Now, we are in conflict due to we have no standars parameter to judge whether the pipes shall be accepted or rejected. At present I just refer to new contions means everything is smooth. In accordance with my problem, for to you all, please help me to give advices.
Appreciate for your attention.
Thanks and Regards
Ari Dwikoranto





RE: Standard of Pipe in a new condition
The engineers should be able to give you a minimum acceptable wall thickness value. You should then be able to take readings at the pit locations. If you sample several lines and find the wall thickness at the pits is below the design requirements, that would give you a pretty strong case for rejecting the batch.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.
RE: Standard of Pipe in a new condition
For example, refer to ASTM A106, Section 18 for piping that conforms to ASTM A106. Accetable/non-acceptable pitting is defined. If not A106, then refer to the applicable standard.
Good luck,
NozzleTwister
Houston, Texas
RE: Standard of Pipe in a new condition
Therefore, I am still hoping for your advice more.
Thank you