Relatively small, so the resistance of each parallel branch is not much different, and the balance is good;
(2) The natural gas pipeline network generally adopts the downward supply type, and the most unfavorable loop is the loop passing through the bottom. Due to extra
The existence of pressure head, as long as the gas supply of the most unfavorable circuit is guaranteed, the upper parallel branch must also have gas;
(3) The parallel branches are not used at the same time or all of them are in use.
It is used under the condition of constant flow, and its flow can be adjusted by adjusting devices such as cocks and valves at the user's end as needed.
Adjust. For the above reasons, it is unnecessary to emphasize the resistance balance of parallel branches in natural gas pipeline network.