2. city gas supply systems

2. CITY GAS SUPPLY SYSTEMS .
City gas supply to systems placed main Demand from that consists of gas supply systems reliable and continuously city consumers for necessary has been gas the amount assured stay , use for easy to use during , security provided , accident speed in the situation with again recovery possible , economical to be it is necessary .
Gas supply systems when designing subordinates attention get ie being designed of the city location , construction of the area density , street of corridors width , different different engineering communication networks with intermediate distances , climate and geological conditions _ _ hqz _ account taken it is necessary .
Gas pipes use to the service looking m ag i stral, in the city and industry enterprises for intended to be can _ City gas pipes own in turn to those in tune divided into :
Networked gas pipes this pipes orca gas industry to enterprises communal household to enterprises , population residence doer to their homes delivered is given Networked gas pipes of gas pressure looking high , average and at low pressure , people visible and network in the image being designed of the city to the relief looking is designed .
Subscriber division , branched from the pipe separately to consumers or one group to consumers to be given can _
House inside gas pipes , building inside the gas delivered to give for or separately to equipment the gas delivered to give enters _
Small in cities one in common being spent 40 percent of gas communal household enterprises for is spent . Medium , large and big in cities while this pointer common being spent from 20 percent of the gas does not exceed City gas supply in systems gas of pipes common 70 % to 80 % of its length , low pressure gas to pipes , only 20-30 percent average and high pressurized gas to the pipes right will come Uzbekistan Republic low pressure in the area gas pipes basically land over will be read. CITY gas supply in systems of pipes reliable work of provision the most good the way this ring visible in the image gas pipes is to be designed . But the loop visible gas pipes network to pipes relatively a lot metal is spent . Small and average in cities most of the time two poganali gas supply system is projected ., in the pipeline of gas pressure up to 0.6Mpa will be if of the city central in the part high pressurized gas pipeline laying down possible if not , then three poganali ( high , average and low) gas pipes will be A lot poganali gas supply systems (0.6MPa) are large in cities and regions range gas supply in systems is used .
Big and average in cities gas pipes ring in the image , small cities for while band ( head closed ) in the image is designed . Networked gas of pipes diameters from 50 mm to 400 mm. up to will be Big city for projectable gas of pipes main image looking we will go out ( picture 3.2.1 )
Gas fuel source as 1- trunk gas pipe service shows . Trunk gas to the pipe gas 2- gas provider station (GTS) . delivered is given from GTS gas on the way out his pressure 1.2 _ MPa is reduced and up pressurized gas pipeline - 6 deliveries is given
High pressurized gas pipe solution in appearance is designed . To this pipe control management branches (NBSH) land under gas keeper warehouse - 11 ha is connected . Earth under gas keeper warehouse , control management shahobcha (NBSH) and high pressurized gas pipes highway gas pipes to the system enters _
City gas supply pipelines through GTS and NBSH provided high pressurized pipe - from 7 begins .
Various different in pressure city gas supply pipes one - one with connection gas management branches through done is increased . if land under gas storage warehouses gas spend seasonal uneven spending for service when indicated , per diem gas spend uneven spending in supply 4 – gas gold stations service shows . In the city big consumers ( industry enterprises , electricity stations , boiler devices ) high and average pressurized gas pipes through is provided .
City gas supply systems reliable and economical performance a lot in scores gas with provider station (GTS) s it also depends on the number . Scientific research and of projects technical economic justifications that's it shows that For example : in the city population number is 120 thousand up to a person -1. GTS, population up to 300,000 people - 2 GTS, 500,000 up to 3 GTS per person offer will be done .



Figure 3.2.1 . Big city gas of supply main image .

1. 
   highway gas pipe ; 2nd gas supplier station (GTS); 3-control management tributary (NBSH); 4- gas goal der station ; _ 5- gas management branch (GBSH); 6- high pressurized ring visible gas pipe -2.0 MPa ; 7- high pressurized solution visible gas pipe 1.2Mpa; 8- high pressurized gas pipeline-0.6Mpa; 9- average pressurized ring looks gas pipe ; -0.3Mpa; 10- average pressurized gas pipeline –0.1Mpa; 11th land under gas keeper warehouse .