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CNG Pressure Regulating Device Operating Instructions
Summary
Compressed natural gas (CNG) regulating device is a device that will progressively reducing high pressure of CNG gas to the pressure to the user.In the process of working, you can monitor ,alarm and linkage control the pressure and temperature.On the basis of fully absorbing foreign technology of CNG regulator and combined with the actual situation in China, our company researched and developed a CNG regulator device equipment with independent intellectual property rights.The key component of the device adopt advanced import products with complete functions, stable performance, high precision pressure regulation compact structure and other features. To ensure the safety of equipment, before system operation, please carefully read this manual and the main parts manuals. The equipment should be operated by qualified professionals to operate and maintain.
The Working Principle and Security Settings
1.Compressed natural gas pressure regulating device working principle:The high pressure natural gas in the high-pressure cylinder group operated through a filter, heat exchanger, primary regulator, heat exchanger, secondary regulator, measurement and other processes,to make the gas meet the requirements of the user, then the gas delivered to the pressure pipe network. Generally, the pressure regulating device is in the form of a two-stage heat exchanger and two-stage regulator's structure.
2.Heat exchanger, in regulating device, using electric heating exchanger and thermostat controls the water temperature.When the water temperature reaches the upper limit, the electric heating exchanger turns off by controlling chain automatically; When the water temperature is below the lower limit, the electric heating exchanger turns on by controlling chain automatically, the heater indicator on control cabinet will turns on .
3.Both primary regulator and secondary regulator are equipped with safety relief valve.The safety relief valve will open automatically when the gas pressure in the regulator exceed the set pressure. Normally,the safety relief valve can turn itself off automatically when the gas pressure down to the working pressure, otherwise determined to be faulty.
4.To display pressure after pressure regulating, both primary regulator and secondary regulator are equipped with pressure gauge.
5. To prevent static electricity, static electricity between the flanges are made Copperbelt jumper, flat conductive strip connected to the ground through the ground network, requiring no more than RESISTANCE 4.0Ω or in accordance with local regulatory requirements.
Technical Parameters
Inlet pressure range: 3-22.0 MPa
After the primary regulator pressure range: 0.8-1.6 MPa
After the secondary regulator pressure range: 0.3-0.6 MPa
Outlet pressure range: 0.3MPa (adjustable
Rated flow: 500Nm³ / h
Medium: natural gas
Operating temperature: -20 ℃ ~ 60 ℃
Heat exchanger water temperature: 60 ℃ ~ 80 ℃
Installation and Operation
1, Installation Requirements:
a, Compressed natural gas (CNG) regulating device installation site and fire protection requirements for the design and construction should reference the relevant provisions of the State or local industry.
b, Install pressure regulating device place for fire powerhouse, no pyrotechnics, fire fighting facilities according to relevant provisions of the design configuration.
c, Smooth solid foundations, pipelines connecting dimensions to match the device body outlet flange.
d, The device should be installed to ensure reliable grounding
e, Not allowed in the vicinity of the device stack any flammable, explosive materials; should be sufficient space nearby in order to facilitate equipment maintenance.
f, Body electrical installation according to relevant regulations were proof electrical construction.
h, The instrument on the unit, valves, etc. without the supplier agreement, the installation may not disassemble, to avoid affecting the normal operation of the equipment.
i , Explosion-proof junction box body can not store tools and other debris, keeping the surroundings clean and control cabinets, dry, avoid fire accidents.
j , Temperature control instrument parameters can not be arbitrarily changed. If change, the qualified personnel must read the instructions carefully before re-set the parameters .
k. Lightning protection devices should be installed in station into the power or control cabinet superior distribution cabine in order to avoid control system failure caused by lightning or damaged.
2, Ready for
a, Equiment outlet pipe connection is completed, air tightness test, pipe replacement is completed.
b, Water is filled into the heat exchanger. Water within the heat exchanger must be clean water, chloride ion content of the water does not exceed 25ppm, pro rata 300PPm in the water plus potassium dichromate (antifreeze), river water, lake water and sewage water is prohibited for heat exchangers.
c, Unloading column and CNG vehicles operating unit: Unloading column is a device inside the car gas to surge devices important operating parts, by quick connector (female), high pressure hose, adapters and high-pressure cut-off valve. First convert the connector and regulating device connected to the high-pressure shut-off valves, note fitted seals, then high pressure hose and adapter connected. CNG vehicles to reach the gas station docked device after a certain parking spaces, the static grounding wire and metal parts connected to the real body, and then the high pressure hose with quick connector device car quick connector (male) quick connect fittings and confirm whether insurance place.
d, Equipment should be carefully checked before starting levels valves and instrumentation to ensure that all levels and manual vent valve, drain valve is closed, each instrument valves and safety valves root valve is open, import quick connector to connect with devices fitted tanker reliable.
e, Control cabinet air switch, the main switches are in the closed position. Close the upper distribution cabinet power switch, heat exchanger system begins to heat up work. After the water temperature rises to 60 degrees Celsius, Begin the next step.
f , Open the imported ball in working path slowly, and make it in slightly open state, open the both sides of the regulator valve slightly, check the regulator outlet pressure meets the design requirements, otherwise, re accordance with the "Instructions regulator" Step settings. Slowly open the outlet valve to the gas pipeline network (Note: At this point the amount of gas to be very small.)
3,The boot operation:
a, Check valve regulating device to work each way, each instrument valves and safety valves root valve, make sure it is turned on; alternate access road and next to the inlet and outlet valves, each exhaust valve, heat exchanger drain valve is closed. Working way valve slightly open .
b, Start regulating device: First slowly open the device vehicle supply pressure valve (this operation should pay particular attention to safety, let people learn to avoid the danger zone), and then open the way to high-pressure natural gas import pressure valve input, one by one to open the road back to work at all levels valves and outlet valves, supply air to the downstream pipe network.
c, We should observed indicators of CNG regulator device closely whether all parts of the parameters are within normal range, if you find a fault should take immediate steps to work. When the device inside the vehicle can not meet the downstream pressure is reduced to the need, at this time switching device car.
Switching device car, firstly, we should close the column aspirated unloading valve , open simultaneously unloading spare column aspirated high-pressure valve (spare unloading column has been ahead of the car with the new device connected), close air unit vehicle (low pressure means the car) on the gas high-pressure valve; open the unloading column drain valve high pressure slowly, within the high-pressure air over the vent hose, high pressure hose and static grounding disassembly line and the device vehicle separation, closed high pressure drain valve, complete the switch.
4,Daily check
a,Inspect the working pressure and instrument instruction of every regulators regularly and periodically ,then record. If the inlet pressure is too low to meet the downstream gas ,the device car should be switched immediately.
b,Inspect the gas temperature, water temperature and instrument instruction of each working line regularly and periodically ,then record.
c,Inspect the water level of the heat exchanger regularly and periodically, and add water timely.
d,Clean the filters regularly and periodically.
e,In case of other phenomena, can refer to Part V, "Troubleshooting and Maintenance" .
f,In winter , the heat exchanger temperature must be maintained, otherwise the water should be drained to prevent equipment from cracking.
5,Shutdown
Close the inlet valve first and close other valves progressively then turn off the main switch of the control cabinet. Turn off the main power of the control cabinet when the equipment is long time shutdown, and also let the water inside the heat exchanger drained to prevent equipment from cracking.
Five,Troubleshooting and Maintenance
Phenomenon |
Cause |
Exclusion method |
Outlet pressure is ultra-low |
The pressure in device car is too low can not meet the gas consumption |
Change other device cars |
Too many impurities in the filter |
Clean the filter |
|
The regulator outlet pressure setting is not correct |
Re-set the regulator outlet pressure |
|
Low temperature of the heat exchanger or icing |
The electric heater or thermal resistance is broken |
Check the electric heater or thermal resistance working condition |
Inlet pressure is too high or gas supply too large |
Check the working condition |
|
Relief valve does not close |
Regulator outlet pressure rise |
Re-set the regulator outlet pressure |
Relief valve port with foreign body |
Check the relief valve, remove foreign body |
|
Pressure instability |
The impulse pipe of the regulator is blockage. |
Clean the impulse pipe |
There are impurities in the pipeline |
Clean the impurities in the pipeline |
|
|
Pressure ultrahigh |
The regulator valve port is damage |
Repair or replace the valve port |
The regulator induction components are broken |
Check the induction components |
|
The regulator outlet pressure setting is not correct |
Re-set the regulator outlet pressure |
Service
1,Please contact us if any problem happened, we will give the solutions and measures in two hours.
2.Service line:0635-8518936 .
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