RE: Use of Nitrogen as a pipeline preservative

From: <Steve>
Date: Fri Aug 27 2004 - 06:31:00 EDT

Hi Adolphus

why not leave the line full of your solution? You would need to check out the biocide carefully as some can have unexpected corrosion effects. If you use nitrogen, it will be important to maintain slight overpressure. Compressed nitrogen cylinders with pressure reducing valve could be used, but it may not be economic if the line is leaky.

Cheers

Steve

-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com] Sent: Friday, August 27, 2004 3:49 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Use of Nitrogen as a pipeline preservative

Likely someone with more field experience will chime in, but you will probably want to do a high pressure N2 purge of the line (watch out for the low points) followed by the usual system overpressurization. Maybe a dynamic purge setup would be useful in order to compensate for the inevitable leaks/detection of pressure loss.

Paul

From: "aomodu" <aomodu@yahoo.com>
To: <PipingDesign@yahoogroups.com>
Sent: Thursday, August 26, 2004 11:11 AM Subject: [PipingDesign] Use of Nitrogen as a pipeline preservative

> 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

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