Paul,
I am in New Mexico this week with Jim Campbell XXXXXXX's pipeline manager. I
reviewed details below with Jim.
Pipeline systems are typically constructed for more or less complete
drainage after hydrotesting. Hydrotesting is typically done using regular
municipal utility water. If the line is pressurized with N2, any small
traces of water should eventually evaporate. So corrosive condition should
not exist. XXXXXXX practice does not include using biocide.
Speak to you when i get back to Mtl.
Regards,
Kim
-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com]
Sent: Thursday, August 26, 2004 10:37 AM
To: Dunleavy, Kim
Subject: Fw: [PipingDesign] Use of Nitrogen as a pipeline preservative
This question just came in on my piping design discussion list. It seems to be in your field of expertise, so I am forwarding it to you for any comments/advice you may have.
Regards,
Paul
>> My question is this a new pipeline is to be preserved for 3 years
>> prior to coming on stream. We have decided to introduce biocide,
>> oxygen scavenger and inhibitor into the hydrotest water prior to the
>> test and afterwards dewater the line. Nitrogen will then be
>> introduced as a preservative for the line.
>> 1. Will the introduction of the above chemicals and oxygen
>> scavenger/inhibitor actually prevent pipeline corrion, since no mater
>> the effiency of our dewatering mechanism there will still be some
>> traces of water left in the line?
>> 2. Will the presence of N2 as a preservative actually prevent the
>> little traces of water left in the pipeline from corroding the
>> pipeline?
>> 3. How do we contain the leakage of N2 from the system since I
>> understand that this is a usual occurence.
>> 4.The pipeline is designed to ASME/ANSI B31.8 CODE, will this code of
>> design be adequate to prevent N2 leaking from the system?
>>
>> THANKS
>>
>> Adolphus Omodu
>> Mechanical Engineer
Received on Sat Oct 09 14:22:00 2004
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