Generally, the chapters on water supply and drainage, heating and gas in the system-wide quota and local quota have many versions every year. If it needs to be used, it must be carried out according to the bidding documents or contract requirements. The standard is the settlement method agreed in the bidding documents and the contract, and then the relevant quota standards can be implemented according to the agreement.

At present, small-scale gas projects, such as natural gas entering households, municipal pipe networks, various filling stations, gate stations, deployment stations, etc. Generally, it is a list budget because the fixed cost of gas is relatively low. Therefore, all the quotations for the contacted projects are a summary of all the management taxes and fees for the main materials, auxiliary materials, machinery and installation, and some units may be different.