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Guru
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Pigging for Cleaning of Piping

03/19/2013 12:31 AM

Pigging is normally selected as cleaning method when bends are of large radious (>5D) and thickness shedule of pipe and bends are same.

An already erected 1200m long 14", 11.1 mm thick pipe has several 5D bends (50 nos) of 19.05 mm thick. Is pigging possible in this case?

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Guru
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#1

Re: Pigging for cleaning of piping

03/19/2013 1:01 AM

There should be pigs whose outer structure is springy enough for this. They already have to get past chill rings, slight flattening at bends, etc.

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Guru
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#2

Re: Pigging for Cleaning of Piping

03/19/2013 7:20 AM

Depends on what type of pig you use. A foam squeegee pig will go just fine, a 3 meter smart pig might have trouble. Most scraper / scrubber pigs should do fine also, you should be able to procure pigs designed for your needs.

Drew K

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#3

Re: Pigging for Cleaning of Piping

03/20/2013 8:13 AM

In Chennai, there is a company called BGR group Ltd (B G Ragupathy) who specialize in cleaning thermal power station boiler tubes on lines by some kind of special material balls which keep striking against the walls of the steel tube and keep it clean. Just check with telephone directory / web site. Their corporate office is old patents office on Mount road.

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#4

Re: Pigging for Cleaning of Piping

03/20/2013 9:13 AM

The issue here is not the length of the pipe, but having the space to install the pig launcher and receiver with all the piping to make it a workable system.

Yes you can pig, most any pipe, but without all the correct hardware it may not be feasible.

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#5

Re: Pigging for Cleaning of Piping

03/20/2013 9:58 AM

Could it be possible to split the cleaning in two or more sections?

It could simplify the work reducing the requirements of the pigging unit for a start.

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Guru
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#6

Re: Pigging for Cleaning of Piping

03/21/2013 11:50 PM

Drewk K,

Thanks, GA. Pipeline is for high pressure oxygen service. I'm interested for scraper/scrubber pig. Will it work for different internal diameter of pipe and bends.

Thanks XYZ for the information. GA.

Vargaalex,

Pig launching and receiving is not an issue. Correct hardware is also available. The issue is whether pigging is possible for different ID for pipe and bends. There are about 40 bends in the piping due to number of expansion loops.

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Guru
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#7
In reply to #6

Re: Pigging for Cleaning of Piping

03/22/2013 10:21 AM

How much does the I.D. vary? Some of the squeegee pigs I have seen for fuel pipeline use are pretty squishy and could be pushed through some slight reduced sections.

Search around for vendors in your region that supply pigs, you might get them to tailor one for your needs. Material selection for oxygen service might get tricky though.

Another consideration, depending on what you need to clean from your pipe would be to plumb in a liquid circulating loop and run something like amertap balls through. The amertap system is designed to send small foam scrubber balls through condensor tubes but with a couple hundred of these flowing through a solid pipe the random collisions with the sides would do a good job but they are so small they wouldn't get caught in narrow sections. You might need to count them to ensure none get left behind then use hot air to purge the water from the lines and follow up with nitrogen to displace the air before loading with oxygen.

Drew K

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Guru
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#8
In reply to #7

Re: Pigging for Cleaning of Piping

03/23/2013 3:29 AM

Thans Drew K for a GA. As I had stated in original post the thickness of pipe and bends vary my about 8 mm. Amertap ball may not be suitable as pipe size is 14" and water is not to be charged.

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Users who posted comments:

abelmh (1); Drew K (2); pritam (2); Tornado (1); vargaalex (1); xyz (1)

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