Pipeline Lay-up 1

[zengx]

For a 230 km 26" CS pipeline that has been hydrotested (by sections), we need to perform the final lay-up.
After the pipeline sections have been hydrotested separately with the valves being not installed; the golden joints for the valves and the hydrotest limits have been completed.
The drying of each tested section, after disposing the water, was achieved by performing several runs of foam pigs.

The question is: Now, we already completed the whole pipeline, do we need a final complete run of additional pig(s) before the lay-up ?

Note: Lay-up will be done by dry air.

Mohammed Diab.
Inspection Supervisor - Saudi Aramco.

 

[zdas04]

I always run a poly coated pig or a turbo pig through the whole line prior to beginning operations (I push it with dry air or warm dry nitrogen). I figure any liquid water I can mechanically remove is that much water I don't have to evaporate with my dry air.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

 

[11echo]

Just a quick question, this pipeline for fuel gas?

 

[zdas04]

11echo,
Fuel gas? Really? 230 km of 26" fuel gas pipe?

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

 

[11echo]

zdas04 ...What you can't get fuel gas in a 26" dia. pipeline down in Texas?

 

[berkshire]

Looking at where the guy is from It is more likely to be oil, But David knew that already.
B.E.

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor

 

[BigInch]

Then what exactly do you think that they doing at all of these gas/oil separator (GOSP) plants?

http://www.satelliteviews.net/cgi-bin/w.cgi/?c=sa&DG=GOSP

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[zengx]

It's crude oil.

Mohammed Diab.
Inspection Supervisor - Saudi Aramco.

 

[SJones]

Being as the pipeline was still being worked on after the rudimentary dewatering of the sections, it might be useful to run an appropriate mandrel pig, or pigs, with the preservation dry air.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[BigInch]

Echo. Now you know.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[11echo]

Everybody seemed to be so fastidious about getting any water out of this pipeline I had thought (rightly or wrongly) it might be a fuel gas, and I was wondering if anybody had though about running a scrapper pig thru a couple times to get the mill scale off.
My apologies for not running this question through “quality control” first!

 

[zdas04]

Echo,
Don't know that it is a "quality control" thing, more a reasonableness thing. It just didn't seem reasonable to conclude that a pipe that big and that long was for fuel gas. Maybe it did to you. My experience is that you can get an awful lot of fuel through a 2-inch line and the biggest I've ever seen was feeding a boiler with a 6-inch line. Sorry you got you nose disjointed over it.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.