OT big tank of gas

David G · Aug 26, 2015

I am back from working on the LNG project for this week, and will need a few days for construction to catch up. This is the biggest tank I have ever seen, it holds 26 million gallons of LNG. I am heading up to Duluth next week to work on a project, then back to this one for the couple of weeks following.

Bob Harvey · Aug 26, 2015

Please explain the ' Gallons' - we talking liquid or ???

David G · Aug 26, 2015

Yes, gallons....

Bob Harvey · Aug 26, 2015

Not what I asked. Gallons of 'Liquefied", non- Liq. Volume plays into this. Not trying to be 'that guy', just need clarification. Tnx

Denny K · Aug 26, 2015

Hi,would that tank have been on Hwy 79 through Sturgis, SD on Jan 24? If so I saw it and have a pic of it on my cell phone. The trailer had more wheels on it than I could count. There were 2 semi tractors acting as pushers/brakes hooked to the rear of the trailer. I think it was some firm from Salt Lake City transporting it.

David G · Aug 26, 2015

It is liquified natural gas.

It is stored at -260 and will expand 625 times when vaporized.

This is a new process for me, so learning a lot.

David G · Aug 26, 2015

The tank is about 200' in diameter and about 150' tall, to big to get picture when close, really set me back when I got close.

Indiana Ken · Aug 26, 2015

(quoted from post at 18:27:17 08/26/15) It is liquified natural gas.

It is stored at -260 and will expand 625 times when vaporized.

This is a new process for me, so learning a lot.

I have a question for you: If the natural gas liquid is allowed to warm up to say, 100 degrees F the vapor pressure in the tank would increase to around 5000 Psi. I have always wondered what they do if the refrigeration fails? Do they just allow the gas to vent off? Could you please tell us more when you get back to the job....thank you.

JMOR · Aug 26, 2015

When they come across the ocean, they vent for the whole trip. "Evaporative" or change of state cooling for what remains.

Jon Hagen · Aug 26, 2015

"When they come across the ocean, they vent for the whole trip. "Evaporative" or change of state cooling for what remains. "

On a "Modern Marvels" episode I watched, they say that some / all ? the vented gas is used to power the ships engine on the trip.

Owen Aaland · Aug 26, 2015

Once LNG temperature gets above about -130°F it will no longer be in a liquid state not mater how much pressure is applied. At temperatures above that critical temperature the pressure is determined only by how much NG would be in the container.

bjb in TX from Ne · Aug 27, 2015

The venting of the gas "boils" enough off to keep the rest at the cryogenic temperatures (ie there is no active refrigeration after it has been liquefied). The very basic process for liquefying any gas is to compress it which will raise the temperature, cool that higher pressure gas down, then lower the pressure again which further cools the gas. Once this cycle happens a few times the gas is cold enough to liquefy. You can feel the effect of boiling off a liquid if you have ever used those cans of air for dusting electronic equipment. LNG is big business down here in Houston for the OG&C engineering market.

Indiana Ken · Aug 27, 2015

Yes, the venting of gas can be and is used to cool the liquid remaining in the tank. Methane is, 1) a green house gas and 2) venting wastes the product. The vented methane can be flared off (burned) which reduces the green house concern however, product is still wasted. My original question was more of interest in what the management process would be for a new installation.

OT big tank of gas

David G

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Bob Harvey

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David G

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Denny K

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David G

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David G

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Indiana Ken

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