Rank: Forum user 
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L&G - difference of opinion to settle.....
On a GAS stats drawing, reference to NHP and LHP....
We think either -
London Hydraulic Pressure
Normal High Pressure
Low High Pressure..
A gas colleague even thinks it is:
Natural and Liquid High Pressure....
Can anyone in the Gas sector provide a definitive answer,,,
regards
pete
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Rank: Forum user 
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Description should be on the drawing legend, if not drawing worthless.
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Rank: Forum user
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maybe i should of explained it better...
the letters are in the legend beneath IP . MP etc.. but as of yet i havent come across any of these type ofl pipes on the dwg,,,,
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Rank: Super forum user 
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I'm not 100% sure on this but I think they relate to National High Pressure Gas Mains and Localised High Pressure Gas Mains.
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Rank: Forum user
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Sutty
just found such a plan and understand your confusion (also now mine) would suggest you contact plan supplier or number/link attached
Gas-0800 688 588-www.nationalgrid.com/UK
Major oil and gas (Deals with high pressure gas and oil distribution networks)-http://www.linesearch.org/
Talpidae
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