One, introductive

The sources of energy of our country past is given priority to with coal, oil and natural gas yield are very low, the oil before liberating tastes much is an entrance, go up century 60 time with falling oil output increases somewhat and can self-sufficient, but structure of the sources of energy still is given priority to with coal. Economy grows since reforming and opening, requirement of the sources of energy grows, native oily resource already cannot be satisfied, entrance proportion rises ceaselessly, structure of the sources of energy asks to be adjusted stage by stage as what supply diversification and environmental protection, in recent years natural gas dosage grows quite fast, also rise only to 2000 however 3% (natural gas whole world is occupied on average 24% , asia 8.8% , developed country 30% ～ 40% ) . Natural gas applies in home, further growth.

Enrage on the west east be defeated is to point to ground of the tub in the tower to wait western natural gas east be defeated by Shanghai and area of delta of the Yangtse River, as project need net of a batch of canals runs control, hand over commerce metric use up with urban user receive charge flow meter, the article gauges means and demand with respect to the discharge of these demand, type of commonly used appearance and characteristic, different connect a dot (use a room namely) choose etc, make brief discuss.

2, discharge of natural and tracheal net measures a type

The purpose fraction that discharge of natural and tracheal net measures runs process control and gross to have sex to manage a network metric two kinds big. Moving process flow control and requirement of general flow industry are similar, just should get used to natural gas combustible explode easily atmosphere and enrage the condition such as difference of Hou high temperature badly on the way, the article does not spread out further.

Hand over metric appearance to also should get used to afore-mentioned requirements. Natural gas hands over commerce metric have mass measure and energy metric two kinds of means, commerce of our country natural gas is metric means is a regulation in statutory requirement character direct falls to undertake having sex with the means of bulk or energy metric, the article does not discuss energy to have sex metric.
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