A. Stationary filling stations for motor vehicles (facilities that fill motor vehicles with natural gas supplied via pipeline or tank lorry that is compressed in the facilities (Continued).
12. Safety devices
(a) Buffer tanks, compressor packages, and the outlet of each stage of the compressor package and storages shall be equipped with pressure relief devices (hereinafter, “safety devices”) such as safety relief valves or relief valves to prevent excessive pressure rise.
(b) The safety devices shall be in compliance with the Korean Industrial Standard (KS) or other applicable standards.
(c) The discharge rates of the safety devices shall be higher than those required by the facilities at which those devices are installed. The minimum discharge rates shall be decided and notified by MOCIE.
(d) The set pressure of the safety device shall not exceed the maximum allowable pressure or design pressure of the equipment.
(e) The safety devices of buffer tanks, compressor packages, and storages shall be equipped with vertical vent pipes whose height is at least 5 meters and capped to prevent rainwater. However, the height of buffer tank vent pipes shall be the higher of 5 meters above the ground and 2 meters above the top of the buffer tanks.
13. Regulators
(a) Connectors and pressure chambers of regulators shall be designed with safety factors greater than 4.
(b) In order to prevent damage of regulators, the low pressure chamber shall be equipped with a safety device, or designed with strength to withstand the operating pressure (the pressure measured with the equipment completely filled with gas whose temperature is 21℃, same hereinafter) of the inlet-side pressure chamber.
(c) Regulators shall be installed at positions protected from freezing of rainwater, snow, or sleet, or appropriately protected to maintain operability.
14. Pressure gauges
(a) Pressure indicators shall be installed on the compressors, storages and dispensers to indicate the discharge pressure, storage pressure, and filling pressure, respectively.
(b) Pressure indicators shall be able to indicate at least 150% of the design pressure of the respective equipment.
15. Pipelines, etc.
(a) The materials of pipelines (inclusive of valves, same hereinafter), tubes, fittings, gaskets, and packings shall be suitable for natural gas. The design temperature of those installed at the downstream of the compressor package shall be 40℃ or lower below zero.
(b) Pipelines, tubes, fittings, and other elements shall be designed with safety factor greater than 4.
(b) Pipelines, tubes, fittings, and other elements shall be designed with safety factor greater than 4.
(c) Pipelines shall be in compliance with KS or other applicable standards.
(d) Strainers, buffer devices, and expansion joints shall be marked with pressure rating.
(e) Hoses shall not be used for the purposes or installed in the places other than the following;
① Motor vehicle injection (hose length less than 8 meters),
② Connectors at the inlet to compressor package,
③ The pipeline less than 1m in length that requires flexibility. pipeline.
(f) Hoses (including metal hoses) used for dispensers shall be resistant to the erosion due to the flow of natural gas
(g) Gas injectors shall be of a construction that can shut off gas flow when not properly connected.
(h) Pipelines and hoses shall be installed and restrained considering expansion, contraction, shock and vibration.
(i) Pipes, in principle, shall be weld jointed. Pipelines buried underground shall not be screw jointed.
(j) The connecting section between storage equipment shall be assembled to minimize vibration.
(k) Do not bend any pipe or hose whose strength may be reduced due to bending.
(l) The standards for the installation of pipeline in addition to the above (a) through (k) shall be in compliance with Section1 (H) of Table 5 in the Appendix.
16. Sealing capacity of pipelines, etc.
Air leak test shall be performed for the piping system including pipes, tubes, hoses and fittings after installation by applying test pressure higher than normal operating pressure.
17. Manual valve and emergency shutdown device
(a) Manual valves shall be installed on the storages.
(b) Check valves shall be installed on the inlet line of storages to prevent gas from being discharged from the storage when a pipeline or hose is damaged.
(c) A manual valve shall be installed after the check valve described in Item (b) above.
(d) A manually operated emergency shutdown device shall be installed near or 5 meters away from dispensers. When emergency shutdown device is operated, the gas and power supply to compressor and dispensers shall be cut off automatically.
(e) When the emergency shutdown devices have been activated or power has been cut-off, the compressor package shall be automatically stopped. Once stopped, compressor package shall be operated only when it is operated or readjusted manually.
(f) An automatic valve shall be provided at the inlet of a compressor to shut off gas supply to the compressor in any one of the following cases:
① When the emergency shutdown device has been activated,
② Power supply failure,
③ Power supply to compressor has been cut off, or
④ When the pressure at the compressor inlet has dropped below the set pressure.
(g) A valve that can be closed automatically in any one of the following cases shall be provided between storages and dispensers;
① When power supply to a dispenser has been cut off, or
② When the emergency shutdown device of a dispenser was activated.
No comments:
Post a Comment