Brief introduction of Beihuan metering and pressure regulating station project

This station is the North Ring metering and regulating station, located at the north side of the North Ring Road and the west side of Tongdao Road, Caofeidian District, Tangshan City. It covers an area of 26497.5m2 (39.7 mu). The facilities in the station are divided into process area, auxiliary production area and reserved area according to functional zoning. The main buildings in the production auxiliary area include production auxiliary rooms and comprehensive rooms, including hot water boiler room, generator room, office, duty room, control room, and toilet. The land area of buildings and structures is 742.95m2. The process area of the gate station is mainly equipped with pressure regulating and metering skid, valve group area, etc. At present, the upstream gas source of the station of the company is connected from the valve chamber of Jidong Oil Field No. 5 through the high pressure pipeline DN400 steel pipe to ensure the gas supply. The main users are industrial users, commercial users and residential areas. This area is mainly composed of industrial users. In combination with the planning of the industrial zone and the investment situation, we actively follow up and expand new users. For the settled enterprises in each park, take the initiative to communicate with them, plan the overall gas configuration and supply plan for them, negotiate and sign the Gas Facilities Supporting Construction Contract with them in due time, and explore new gas users. At present, the maximum daily gas consumption is 40000 m ³， It is estimated that the maximum daily gas consumption will be 100000 m in three years ³。
The process area of the gate station is mainly equipped with: pressure regulating and metering skid, valve group area, vent riser, blowdown tank, etc.

Gas supply scale

The design peak hour gas supply capacity of the station is 2 × 104 Nm3 (short-term gas supply capacity meets 0.5 × 104 Nm3, long-term gas supply capacity can reach 2.0 × 104 Nm3), the maximum design daily gas supply capacity is 48 × 104 Nm3, with an annual gas supply scale of 1.68 × 108Nm3。

Station area parameters

1) Design pressure of pipeline: 1.6MPa (gauge pressure, the same below);
2) Working pressure of pipeline: ≤ 1.45MPa (gauge pressure, the same below);
3) Design temperature: - 19~60 ℃;
4) Inlet gas temperature: 5 ℃;
5) Transmission medium: natural gas (the quality index of natural gas shall not be lower than the relevant provisions of Class I gas in Natural Gas GB 17820-2018);
6) Seismic fortification intensity: the seismic fortification intensity of Caofeidian District is 7 degrees, the design seismic basic acceleration value is 0.15g, and the design characteristic period value is 0.65s;

Technical and economic indicators

1. The total land area is 26497.5m2 (39.7 mu)
2. The station area is 26497.5m2 (39.7 mu)
3. Building coefficient 19.43%
4. Land area for buildings and structures 742.95m2
5. Plot ratio 0.333
6. Road and return yard area 2687.25m2

Gate station process

The design pressure of the sub-high pressure inlet pipeline is 1.6MPa. According to the data provided by the owner, the working pressure of the incoming gas is ≤ 1.45MPa, and the temperature of the incoming gas is 5 ℃. After the natural gas enters the station, it is filtered, metered and regulated, and the pressure of the natural gas is adjusted to medium pressure. After odorization, the natural gas exits the station and is connected to the medium pressure pipe network to supply gas to downstream users. The design pressure of the medium pressure outgoing pipeline is 0.4MPa (working pressure ≤ 0.35MPa).

Main equipment and materials

1、Main equipment

Table 6.1-1 List of Main Equipment

Equipment tag number	Equipment name	Technical parameters and specifications	Quantity (set)
1-1～2	Filter DN150	Design pressure  1.6MPa，working pressure≤1.45MPa， processing capacity Q=10000Nm3/h, Filtering precision：10μm	2
2-1～2	Turbine flowmeter DN150	working pressure≤1.45MPa，Standard flow rate is 10000m3/h	2
3-1～2	Safety shut-off valve DN80	PN16 The cutoff pressure is 0.4MPa	2
4-1～2	Working voltage regulator DN80	PN16  Maximum working flow：7000Nm3/h，P1=1.45MPa ，P2=0.35MPa	2
6	Ball Valve DN150	PN16   Q941F-16C	1
5	Pump-type odorization device	PN16，Working pressure is not greater than 0.35MPa，Odorization amount  20mg/Nm3	1
7	Ball Valve DN300	PN16   Q941F-16C	1

2、Safety release pressure setting

Table 6.2-1 Selection of Main Equipment

Number	Valve type	Location and number of safety pipeline	unit	Quantity	Pressure setting
1	Spring-loaded safety valve PN16 DN50	Inbound main	Individual	1	Take-off pressure 1.6MPa
2	Spring-loaded safety valve PN16 DN50	Manifold 3	Individual	1	Take-off pressure 0.4MPa

3、 Selection of main materials

Selection of pipes in the station: the selection of steel pipes shall comply with the provisions of Seamless Steel Pipes for Fluid Transportation (GB/T 8163-2018). The pipe sleeve is made of Q235B, and its performance complies with the provisions of Welded Steel Pipe for Low-pressure Fluid Transportation (GB/T 3091-2015). See the following table for details:

Table 6.3-1 Selection of Main Materials

Pipe No	Steel pipe specification	Design pressure MPa	Wall thickness of steel pipe mm	Material quality	Steel pipe type	Steel pipe standard
NG-0110 NG-0120	D159	1.6	6	20	seamless steel tube	GB/T 8163
	D325	0.4	8	20	seamless steel tube	GB/T 8163
VG-0110	D57	1.6	4	20	seamless steel tube	GB/T 8163
VG-0120	D108	1.6	5	20	seamless steel tube	GB/T 8163
VG-0130	D57	1.6	4	20	seamless steel tube	GB/T 8163
BG-0110	D89	1.6	5	20	seamless steel tube	GB/T 8163

4、Valves

The natural gas pipeline valve complies with the current national and industrial technical regulations. The valve manufacturer has the valve manufacturing license and selects the natural gas special valve with good tightness, safety and reliability. The valve shall be provided with product certificate and installation instructions before delivery. The installation of valves shall comply with the relevant provisions in the Code for Construction and Acceptance of Urban Gas Transmission and Distribution Engineering (CJJ 33-2005).

5、Pipe fittings

The pipe fittings selected in this project are all seamless pipe fittings.
The material of pipe fittings for process pipes shall be 20, and the material of pipe fittings shall be the same or similar to that of connecting pipes. Its manufacturing standard shall comply with the requirements of Type and Parameters of Steel Butt-welding Pipe Fittings (GB/T 12459-2017) and Technical Specification for Steel Butt-welding Pipe Fittings (GB/T 13401-2017).

6、Schematic Diagram of the Geographical Location and Surrounding Relations of the North Ring Regulator Station

7、Distribution Map of North Ring Regulator Station