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LNG pt. 1 (merged)

Discussions of conventional and alternative energy production technologies.

Re: LNG as interim energy source

Postby SoothSayer » Sat 08 Jul 2006, 05:14:54

Natural gas fields decline VERY rapidly and unpredictably.

This means that within a year or two Europe may suddenly need a lot of LNG to replace North Sea gas.

I can imagine LNG becoming a KEY resource for MANY countries over the next 5 years.

So where will it come from, what will carry it, how will the importers handle it?

How much will it cost?

Will it be on the spot market or on long term contracts?

Does Europe have enough buffer storage to bridge cold snaps in winter?

With Qatar's moratorium on new supply deals, I strongly suspect that there will be a LNG supply crunch - and very high prices real soon now.

I would be especially interested to see a summary of what long term supply contracts to the West are already in place ... and which countries do NOT have contracts yet.

I bet some major countries have left it too late ...

I also suspect that political pressure in times of shortage might lead to unprepared countries DEMANDING gas supplies from neighbours who had the foresight to obtain stocks.

(Hasn't Germany already reminded gas supplier Norway about what happened in WW2?)

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Re: LNG as interim energy source

Postby pea-jay » Sat 08 Jul 2006, 05:43:23

Plus now there is the disruption factor on the receiving country. Currently, gas production is widely distributed and no well or company accounting more than a fraction of the total production. LNG changes this. Now you potentially could have whole facilities disrupted by natural disasters which could take 2-4 BCF/d offline VERY quickly. A policy that encourages CA to derive 20-30% of their gas from LNG from terminals in and around southern CA coast would leave the state vulnerable to a 20-30% curtailment of the gas supplies in the event of a major earthquake.

Ditto for a gulf hurricane on GOM LNG facilities. Its kinda like putting all your eggs in one basket.

There are so many issues about LNG its mindboggling why anyone other than Japan, Korea and Taiwan are pursuing this option. (Those are the only countries with a long history of LNG trade with Long term contracts to show for it)
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LNG Ship

Postby bruin » Tue 29 Aug 2006, 16:23:19

I've always wondered what an LNG ship looks like:



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What a disaster if something this large had a problem. Just like oil tankers, eventually one of these things will fail.
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Re: LNG Ship

Postby lateStarter » Tue 29 Aug 2006, 16:31:18

I think it would be more effective if you found a photo with something in the foreground that could help us appreciate the scale. And they are already having 'minor' leaking problems with some of the most recently built ones from what I last remember...
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Re: LNG Ship

Postby NEOPO » Tue 29 Aug 2006, 16:38:25

behold the future of natural gas in north america!! ;-)

I am sure you will see many more of these creatures flocking along the cali coast in schools near feeding centers as well as out at sea in their natural habitat alone or in pairs ;-)
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Re: LNG Ship

Postby canis_lupus » Tue 29 Aug 2006, 16:58:15

Some notes -

It's empty -- you can tell by how high it is out of the water and you can see the propeller (screw).

For perspective, look at the bridge windows. The are three feet by five or six feet.

It is pretty evident how bad an NG boom would be...
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Re: LNG Ship

Postby bruin » Tue 29 Aug 2006, 17:19:16

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Re: LNG Ship

Postby rogerhb » Tue 29 Aug 2006, 17:20:04

$this->bbcode_second_pass_quote('lateStarter', 'I') think it would be more effective if you found a photo with something in the foreground that could help us appreciate the scale.


Look at the size of the windows on the bridge.
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Re: LNG Ship

Postby lateStarter » Tue 29 Aug 2006, 17:36:05

$this->bbcode_second_pass_quote('rogerhb', '')$this->bbcode_second_pass_quote('lateStarter', 'I') think it would be more effective if you found a photo with something in the foreground that could help us appreciate the scale.


Look at the size of the windows on the bridge.


I still think a USN destroyer in the foreground would be more effective at helping the rest of us feeble folks (who have a problem extrapolating from a 3x6 brdige window to what the real size is) appreciate what is being shown... It's like showing someone a picture of the Grand Canyon...
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Re: LNG Ship

Postby ClubOfRomeII » Tue 29 Aug 2006, 18:21:17

$this->bbcode_second_pass_quote('NEOPO', 'b')ehold the future of natural gas in north america!! ;-)


Yup.
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Postby PeakOiler » Tue 29 Aug 2006, 19:43:27

So my question is, where does the "boil-off" of that cryogenic gas vent? How much boil-off is experienced during shipping that cryogenic fuel? To the atmosphere? Have the engineers designed the LNG tankers to capture or convert the boil-off NG via fuel cells to supply any electricity on that ship?

How about using the boil-off LNG to provide power to the props? Is there a "hybrid version"? The latest German subs are fuel-cell powered, btw.

And if that design works, then we're just one more step closer to shipping liquid H2.

Never mind.
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Re: LNG Ship

Postby mrobert » Tue 29 Aug 2006, 19:48:35

That's sick :)
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Re: LNG Ship

Postby Andy » Tue 29 Aug 2006, 20:37:06

I think LNG tankers use the boil off for propulsion either via steam turbines or gas-diesel engines (diesel engines run on natural gas but using pilot diesel injection) Some newer ones are equipped with onboard cryo units to reliquefy the boil off and preservve product for maximum payload.
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Re: LNG Ship

Postby rogerhb » Wed 30 Aug 2006, 04:34:23

$this->bbcode_second_pass_quote('lateStarter', 'I') still think a USN destroyer in the foreground would be more effective at helping the rest of us feeble folks (who have a problem extrapolating from a 3x6 brdige window to what the real size is) appreciate what is being shown... It's like showing someone a picture of the Grand Canyon...


Wouldn't an Iranian suicide speed-boat be better for comparison?
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Re: LNG Ship

Postby mrobert » Wed 30 Aug 2006, 05:30:58

$this->bbcode_second_pass_quote('rogerhb', '
')Wouldn't an Iranian suicide speed-boat be better for comparison?


Why is it that everyone of us truely thinks about how that thing would look blown up, yet everyone is shy to admit it.

Come on people. Let's admit it.
Blowing up such a thing would be a unique show :)
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Re: LNG Ship

Postby Niagara » Wed 30 Aug 2006, 10:19:11

$this->bbcode_second_pass_quote('mrobert', '')$this->bbcode_second_pass_quote('rogerhb', '
')Wouldn't an Iranian suicide speed-boat be better for comparison?


Why is it that everyone of us truely thinks about how that thing would look blown up, yet everyone is shy to admit it.

Come on people. Let's admit it.
Blowing up such a thing would be a unique show :)


Watch the movie Syriana. The LNG tanker scene at the end is really something. Quite a good movie.
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Re: LNG Ship

Postby mrobert » Wed 30 Aug 2006, 10:44:26

Syriana was an awesome movie :)
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Postby ChumpusRex2 » Wed 30 Aug 2006, 13:10:47

$this->bbcode_second_pass_quote('PeakOiler', 'S')o my question is, where does the "boil-off" of that cryogenic gas vent? How much boil-off is experienced during shipping that cryogenic fuel? To the atmosphere? Have the engineers designed the LNG tankers to capture or convert the boil-off NG via fuel cells to supply any electricity on that ship?


Ideally, no gas would boil-off. In practice, a tiny bit does.

The tanks are refrigerated, using power from the ship's engine to stop boil-off and to scvanenge and recondense any vapours to do happen to boil.

Early designs of tanker captured the gas that boiled off and used it to power turbine engines (for propulsion, electricity and refrigration). However, this approach has been largely abandonned in more modern craft: turbine engines have appaling efficnency, and with the high price of LNG it isn't cost effective.

Modern tankers use heavy-duty marine diesel engines running on fuel oil. These engines are much more efficient, and the fuel much cheaper.
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Re: LNG Ship

Postby nemo » Wed 30 Aug 2006, 18:06:29

I once sailed with a seawoman from Finland who told a tale about a perilous voyage on a gas transport. As I remember it, she described a problem with the refrigeration, resulting in gas boil-off. A smoking ban ensued, resulting in a scared, nicotine-starved crew (most seamen smoke in my experiece). To make matters even worse, they had some problems with ice build-up that had to be carefully chipped away with copper hammers due to the risk of sparks. 8O

I honestly can't say I'd mind seeing one of them things go boom from a safe distance though...
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Re: LNG Ship

Postby Aedo » Wed 30 Aug 2006, 23:15:02

As I understand it LNG doesn't go boom. There is a chance it would catch fire and burn but it wouldn't explode (as a BLEVE) as it is cryogenic rather than pressurised storage.
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