The pipeline has been designed for controlled lateral buckling. The things that im not sure is the effect if the cable to the pipeline (magnetic field, etc). Im searching tracj record worldwide and can only fiund DEH application.
I did jot day the od temp of pipeline is 150degC. Pipeline design temp is 150 degC.
Is there any effect if the high voltage power cable to the pipeline as it is piggybacked to the pipeline. Like eddy current effect, interference to pipeline CP (sacrificial anode).
For the pipeline itself is...
I did so many sectional pipeline replacements with lot of flanges and mechanical connectors in the middle of pipeline. No issue with the Authority approval. We also have other pipeline HPHT that having U expansion spool in the middle of the pipeline.
Has anyone ever design or install pipeline with piggybacked High voltage power cable? If yes, what is the limitation?
We have one HPHT pipeline (171 bars design pressure and 150 degC design temperature. And someone wanted it to have high voltage power cable to be installed piggyback with that...
Please be focus on "thermoplastic" pipe with non meyallic reinforcement, called RTP.
Flexsteel product is flexible pipe with steel reinforcement, and fiberspar or any GRP product is thermoset pipe. Both ar not my interest in this discussion.
API 15S was a JIP output. However it is not a spec, just recommended practice. With recent development in composite pipe, RTP is not just kevlar reinforced thermoplastic, but also glas fibre, combined glas - kevlar reinforcement, bonded and unbonded structure. They are trying hard to fit in API...
But what is the difference with flexible pipe (API 17 J), and also some sort of rubber line (API 17K) but with steel reinforcement. If fire occur, both will provide similar effect as RTP.
So what specifically prohibit Pipe with "non metallic reinforcement" type is prohibited?
For ASME B31.4, I couldn't find wording that RTP is prohibited for onshore application, even though the RTP is also not listed in the table, but section 423.1 (b) --> Except as otherwise provided for in this Code, materials which do not conform to a listed specification or standard in Table...
Refer to ASME B31.4 Chapter IX section A423.2 and ASME B31.8 Chapter VIII section A811, is there any reason why plastic pipe with non metallic reinforcement such as RTP pipe is prohibited to be used for offshore liquid pipeline system under ASME B31.4 or for gas transmission line under ASME B31.8?
We are using concrete support. However, steel plate will be still there on top of the concrete, which is in contact to the pipeline (separated only by coating).
Soil resistivity is 30 ohm-m
Dear Big Inch,
I don't think it is effective to use aluminium anode for onshore buried section. That's way in the initial design we want to separate those two section using insulating gasket.
In case we remove the insulating gasket, the magnesium anode (onshore section) is more negative...
Dear All,
I have one pipeline under design stage, comprise of 10 km offshore and 400 m onshore. Most of the onshore section is above ground on support, except at the road crossing where it is buried. Initially it was proposed to install insulating gasket kit at shore landfall to separate the...
In addition to above discussion, I have other question regarding splash zone coating. Is Polypropylene (4LPP) is suitable for splash zone and above splash zone area? Is it resistant to UV?
Tx Ussuri, but both threads is not specific to pipeline. I'm refering to ASME B31.8, all it mentions is MAOP and DP, none is MAWP.
Can anybody give explanation, especialy understanding of term by code?
Can anybody explain what is the difference between Maximum Allowable Working Pressure (MAWP) and Design Pressure for pipeline system? Can it be the same?
