LNG spill detector

Why do not you use a RTD/Temperature Transmitter (or switch) set able to read temperatures less than -100 degC. The temperature like that never occurs naturally and its presence may only indicate a LNG leak.

Depending exactly on the application surely a normal gas detector would do the job. The LNG will rapidly become NG when it leaks and a gas detector should be able to detect it down to 25PPM in vapour form.

How about a good old fashioned davy lamp, and a web cam, bluetooth etc.

A canary?

If LNG spilled --it gasified already.

You mean gas sniffer?

If Butane and low temp. ground- you will get some liquid .

Sniff and you will find.

If Methane ,Ethane,Propane these are already into the atmosphere.

Can look here. Success to you

http://sensors-transducers.globalspec.com/Industrial-Directory/spill_detector

Leo - When you use the term "spill detector" I assume that you are looking for gas leaks. Most commercial gas detectors/sniffers will do the job, however if your needs justify the investment then I have recently seen demonstrated the Flir (I think it was called Gasfinder) camera. It looked very promising for reasonably remote imaging of gas leaks. Try this site http://www.flirthermography.com/cameras/camera/1109

Pilkington Security used to manufacture a fibre optic based LNG leak detection system which was capable of measuring a few drops of spilled LNG over the length of the optical fibre (up to a few kms). As I used to work for BG R&T in Killingworth we used to have the job of servicing and testing this equipment and demoing to LNG site staff. Requirement died off during lack of interest in LNG in BG about 15 years ago, obviously more interest now!

Does anyone know who supplies this system now? I still have the original circuit diagrams and fibre processing equipment but would rather buy/investigate a new system as I am sure it has been improved since my day!