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How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/14/2017 4:35 PM

I am on a site in So. Louisiana in charge of preservation during construction. Some of the towers were designed with welded connections on the piping. (We've already screamed and cussed about this enough). The design company felt that all of the welded connections would be better, but they are not thinking about down-the-road issues. The equipment came in under purge, but when the caps are removed to weld the piping in place, the client still wants to try and keep a purge on the tower. Start-up is not until 4th quarter next year. Does anyone have any ideas on the best way to accomplish this safely and cost effectively?

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#1

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/14/2017 4:50 PM

Weld some purge fittings in appropriate places.

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#2

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/14/2017 5:19 PM

I have a tower under my desk. It is running Linux and I am using it as I type now.

A family member showed me pictures of a tower at basic training. They had to climb up one side of it and repel down the other.

I remember as a kid climbing a fire tower at a state park. I really don't like heights very well.

My dad had a tower for his ham radio antenna.

Any chance you could be a bit more specific? Are you referring to one of the towers I listed or do you have something else in mind.

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#3

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/14/2017 5:41 PM

Also check out "hot tapping", which is very similar to what you want.

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#4

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/14/2017 6:59 PM
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#5

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/15/2017 2:06 AM

Long term storage using Nitrogene purge It is not the only method that exists:

http://www.npl.co.uk/upload/pdf/temporary_corrosion_protectives.pdf

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#6

Re: How can I keep a nitrogen purge on a tower with no flanges on the nozzles?

08/15/2017 9:01 AM

Determine the reason for the nitrogen purge requirement. If it's for corrosion resistance, then de-humidification may be sufficient. You might just use dry air or heat.

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#7

Re: How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/15/2017 1:20 PM

Hi BravoRomeo,

It would be nice to know the size of the columns, what they are used for, and their material of construction.

Thanks

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#8

Re: How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/15/2017 5:06 PM

BravoRomeo,

Go out there and look at all the Butt Weld connected lines to each vessel.

Somewhere down each pipe line from each Vessel connection there will be a Valve.

Choose one connection down low on each vessel to use as an inlet point.

Choose another connection high up (Off the top) on the vessel as an outlet.

Shut off all of these Valves except on these two (inlet and Vent) lines and reintroduce your Nitrogen Purge.

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#9
In reply to #8

Re: How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/15/2017 8:38 PM

The relief valve assembly should have a vent. The nitrogen purge could be connected here. Similarly the bottoms liquid outlet would normally have a manual drain which gives your other connection. Do make sure the downstream valves are closed and be VERY careful when purging that no-one is in the vicinity of the outlet valve.

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#10

Re: How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/16/2017 9:07 AM

1) Consider the cost of welding some of the permanent connecting piping to the vessel (if available) and isolate at a flange or valve.(This is work that will need to be done anyway ...!!!). Combine this method with the use of threaded pipe plugs and caps when necessary

2) Evaluate the cost of expandable/ inflatable plugs.There are many types of these devices. Is this possible with the tower geometry ???

3) Contact the tower supplier and ask him for any suggestions.

4) What is your recommended nitrogen purge pressure ?

5) Explain why you removed the nozzle caps so early ...without having all adjoining piping ready ? Which MBA/PMP within your organization was responsible for that bone-headed deccision ?

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#11

Re: How Can I Keep a Nitrogen Purge on a Tower With no Flanges on the Nozzles?

08/16/2017 12:06 PM

Here we go again. OP can't be troubled to come back and answer some necessary questions.

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