PDF GB 50177-2005 English (GB 50177-1993: Older version)
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Design code for hydrogen station
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GB 50177-2005: PDF in English GB 50177-2005
UDC GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 50177-2005
Design Code for Hydrogen Station
ISSUED ON: APRIL 15, 2005
IMPLEMENTED ON: OCTOBER 01, 2005
Issued by: Ministry of Construction of the People's Republic of China;
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China.
Table of Contents
Foreword ... 4
1 General Provisions ... 6
2 Terms ... 6
3 General Layout ... 8
4 Process System ... 10
5 Equipment Selection ... 13
6 Process Layout ... 15
7 Building Structure ... 17
8 Electrical and Instrument Control ... 19
9 Lightning Protection and Earthing ... 21
10 Water Supply and Drainage and Fire Fighting ... 22
11 Heating and Ventilation ... 23
12 Hydrogen Gas Pipeline ... 23
Appendix A Division of Rating for Explosion Hazard Zone in Hydrogen Station ... 27
Appendix B Minimum Clear Distance between Overhead Hydrogen Gas Pipeline
and Other Overhead Pipeline in Plant Area, Hydrogen Station and Shop ... 29
Appendix C Minimum Clear Distance between Overhead Hydrogen Gas Pipeline in
Plant Area and Buildings and Structures ... 30
Appendix D Minimum Clear Distance between Hydrogen Gas Pipeline Buried
Directly in Plant Area and Other Buried Pipelines ... 31
Appendix E Minimum Clear Distance between Hydrogen Gas Pipeline Buried
Directly in Plant Area and Buildings and Structures ... 32
Explanation of Wording in This Code ... 33
1 General Provisions
1.0.1 This code is formulated with a view to correctly implementing the principles and
policies of the national capital construction in the design of hydrogen station and hydrogen
supply station, ensuring safety production, energy conservation, environmental protection,
meeting production requirements, and achieving advanced technology and economy and
rationality.
1.0.2 This code is applicable to the design of newly-built, renovated or extended hydrogen
station and hydrogen supply station and of hydrogen pipeline in plant area and shop.
1.0.3 The production fire hazard category of hydrogen station and hydrogen supply
station shall be Category "A".
The explosion hazard grade of room or area with explosion hazard in hydrogen
station and hydrogen supply station shall be divided into Zone 1 or Zone 2, and shall
meet the requirements of Appendix A of this code.
1.0.4 The design of hydrogen station, hydrogen supply station and hydrogen pipeline shall
not only comply with this code, but also those in the current relevant ones of the nation.
2 Terms
2.0.1 Hydrogen station
General term of process facilities, filling facilities, compression and storage facilities,
auxiliary facilities and buildings and structures or locations required by hydrogen production
through relevant process (for example, pressure swing adsorption by using water electrolysis,
natural reformed gas, methanol reformed gas, coke oven gas, water gas, etc. as virgin gas).
2.0.2 Hydrogen supply station
General term of buildings and structures, hydrogen gas receivers or locations,
supplying hydrogen through bottles or/and pipelines, excluding hydrogen generation
equipment.
2.0.3 Hydrogen gas receiver
General term of containers with constant pressure and variable volume (wet storage
holders) and with variable pressure and constant volume, for storing hydrogen.
2.0.4 Open flame site
Fixed site with exposed flame or red heat surface indoors and outdoors.
2.0.5 Sparking site
Chimney with spotting fire or such fixed site as outdoor grinding wheel, electric
welding and gas welding (cutting).
2.0.6 Filling hydrogen gas station
General term of buildings and structures or locations of hydrogen gas compression,
filling facilities and necessary auxiliary facilities for hydrogen gas filling.
2.0.7 The installation of hydrogen gas produced by electro1ysising water
General term of the combination of such equipment as water electrolyzer, hydrogen
(oxygen) gas-liquid separator, hydrogen (oxygen) cooler and hydrogen (oxygen) washer
which take water as the raw material.
2.0.8 The system of hydrogen gas produced by electrolysising water
General term of process system composed of the installation of hydrogen gas produced
by electro1ysising water and such operating units as hydrogen gas pressurizing, storage,
purification and filling, by producing hydrogen gas through water electrolysis process.
2.0.9 The installation of hydrogen purification by pressure swing adsorption
General term of the combination of process equipment which takes various gases
containing hydrogen as raw material, passes through multiple adsorption towers, adopts
pressure swing adsorption method and extracts hydrogen from virgin gas.
2.0.10 Hydrogen purification system by pressure swing adsorption
General term of process system composed of pressure swing adsorption device and
such operating units as hydrogen pressurizing, storage, purification and filling, by purifying
and producing hydrogen from various gases containing hydrogen through pressure swing
adsorption method.
2.0.11 The installation of hydrogen gas produced by the methanol transforming
General term of the combination of production equipment for cracking and
transforming methanol and producing hydrogen gas at a certain temperature, by taking
methanol and water as the raw material and adopting the catalytic transformation process.
2.0.12 The low pressure compressor for the hydrogen gas
Hydrogen gas compressor with output pressure less than 1.6MPa.
2.0.13 The middle pressure compressor for the hydrogen gas
Hydrogen gas compressor with output pressure larger than or equal to 1.6MPa and less
than 10.0MPa.
2.0.14 The high pressure compressor for the hydrogen gas
Hydrogen gas compressor with output pressure larger than or equal to 10.0MPa.
2.0.15 The bundle of hydrogen gas cylinders
Gas cylinder unit which is fixed by dedicated frame and the joints of multiple gas
cylinders are connected in parallel and combined through gas collecting tubes.
2.0.16 The hydrogen gas manifolds room
Room equipped with such facilities as manifolds for supplying hydrogen gas with
hydrogen gas cylinder.
2.0.17 The hydrogen gas filling room
Room equipped with such facilities hydrogen gas filling station or the bundle of
hydrogen gas cylinders for filling hydrogen gas cylinders.
2.0.18 Solid cylinder
Cylinder stored with filling pressure gas, gas cylinder with a water volume of 40L and a
design pressure of 12.0~20.0MPa in general.
2.0.19 Empty cylinder
Gas cylinder without internal pressure or remained with residual pressure.
2.0.20 Wet hydrogen
Hydrogen gas with water content reaching saturated or supersaturated state at the
located temperature and pressure.
2.0.21 The hydrogen gas compressor for turning system over
2 The adjacent wall shall be the fire wall without door, window or hole;
3 It shall not be connected with the shop with such fire working as heat treatment,
forging and pressing, and welding;
4 It should be arranged at the end of the plant building, and the fire resistance grade
of the connected building shall not be less than Grade II.
3.0.6 When the solid hydrogen gas cylinders in the hydrogen supply station do not exceed
60 or the floor area does not exceed 500m2, it may be adjacent to the hydrogen shop with
fire resistance grade not less than Grade II or other Category D or E shop with non-fire
working; the adjacent wall shall be the explosion-proof protecting wall without door,
window or hole, and should be arranged near the outer wall or end of the plant building.
3.0.7 Hydrogen bottling room, solid cylinder room and empty cylinder room in the
hydrogen station should be arranged at the edge of the plant building.
4 Process System
4.0.1 The type of hydrogen production system in the hydrogen station shall be determined
in accordance with the following factors:
1 Scale of hydrogen station;
2 Local hydrogen source condition and the supply condition of raw material and
power for hydrogen production;
3 The requirements of the user for hydrogen gas purity and its impurity content as
well as pressure;
4 Characteristic of hydrogen gas use for the user, such as load change condition and
continuity requirements;
5 Technical and economic index and characteristic of hydrogen production system.
4.0.2 The system of hydrogen gas produced by electrolysising water shall be equipped
with the following devices:
1 Pressure regulating device shall be arranged so as to maintain a certain pressure
difference value between water electrolyzer outlet hydrogen gas and oxygen gas, and the
pressure difference value should be less than 0.5kPa;
2 Vent pipe, stop valve and sampling analysis valve shall be arranged between
hydrogen gas outlet pipe and hydrogen gas main and between oxygen gas outlet pipe and
oxygen gas main for each set of the installation of hydrogen gas produced by electrolysising
water;
3 Raw material water preparation device shall be arranged, including raw material
water tank, raw material water pump, etc. The outlet pressure of the raw material water
pump shall be appropriate to the working pressure of the hydrogen production system.
4 Alkaline solution preparation and recovery device shall be arranged. Alkaline
solution filter shall be arranged at the water electrolyzer inlet
4.0.3 The oxygen gas produced through the system of hydrogen gas produced by
electrolysising water may be recycled or directly exhausted to atmosphere as required, and
shall meet the following requirements:
1 When the electrolyzed oxygen gas is recycled, hydrogen autoanalyzer in
oxygen and manual analysis device must be arranged, and hydrogen excess
concentration alarm device in oxygen shall be arranged;
2 When the electrolyzed oxygen gas is recycled or directly exhausted to atmosphere,
measures shall be taken to keep the balance of oxygen gas and hydrogen gas pressure.
4.0.4 The arrangement of the hydrogen purification system by pressure swing adsorption
shall be determined according to the following factors:
1 Pressure, composition and impurity content of intended virgin gas;
2 Pressure, purity and impurity content of product hydrogen gas;
3 Continuity and load change condition of hydrogen gas use;
4 Technical and economic index.
4.0.5 The hydrogen purification system by pressure swing adsorption shall be arranged
with the following devices:
1 Pretreatment facilities of virgin gas (determined according to the impurity content
in virgin gas);
2 Absorber set and program control valve;
3 Refining of hydrogen gas (determined according to the requirements of the user for
hydrogen gas purity, impurity content, etc.);
4 Buffer facilities of hydrogen gas and desorption gas;
5 Desorption gas recycling facilities;
6 Pressurizing facilities of virgin gas, product hydrogen gas and desorption gas shall
be arranged as required.
4.0.6 The system of hydrogen gas produced by the methanol transforming shall be
arranged with the following devices:
1 Storage and conveying device for raw material methanol and desalted water;
2 Methanol transformation reactor and its auxiliary devices, such as heating furnace
or heater, heat recovery equipment;
3 The installation of hydrogen purification by pressure swing adsorption.
4.0.7 Hydrogen gas buffer tank shall be arranged in front of the hydrogen gas compressor.
Multiple hydrogen gas compressors may be connected in parallel to suck gas from the
identical hydrogen gas pipeline, but measures shall be taken to ensure the hydrogen gas at
the gas suction side is positive pressure.
Hydrogen gas receiver shall be arranged at the back of the compressor for conveying
hydrogen gas, and bypass pipe shall be arranged between inlet pipe and exhaust pipe of the
hydrogen gas compressor.
4.0.8 The arrangement of safety protection device of hydrogen gas compressor shall
meet the following requirements:
1 The safety valve shall be arranged between the compressor outlet and the first
stop valve;
2 The inlet and outlet of the compressor shall be arranged with high and low
pressure alarm as well as ultralimit shutdown device;
3 The lubricating oil system shall be arranged with the alarm device for too low
oil pressure or too high oil temperature;
4 The cooling water system of the compressor shall be arranged with
5 Equipment Selection
5.0.1 The design capacity of the hydrogen station should be determined in accordance with
the following factors according to hydrogen gas purpose and use characteristics:
1 Mean hourly consumption per day and night or mean hourly consumption per shift
of various hydrogen equipment;
2 The sum of the maximum hourly consumption of continuous hydrogen equipment
and the mean hourly consumption per day and night or the mean hourly consumption per
shift of residual hydrogen equipment;
3 The hydrogen station with hydrogen gas for export sales shall be determined
according to external hydrogen gas supply volume or market demand condition and
commercial economic scale.
5.0.2 The model, capacity and quantity of the installation of hydrogen gas produced by
electro1ysising water shall be determined according to the following factors through
technical and economical comparison:
1 The installation of hydrogen gas produced by electrolysising water with small
power consumption, low electrolysis chamber voltage, reasonable price and reliable
performance shall be reasonably selected according to hydrogen gas consumption, use
characteristics, etc.;
2 When the newly-built hydrogen station is arranged with 2 or more installations of
hydrogen gas produced by electro1ysising water, their model should be the same;
3 Standby installation of hydrogen gas produced by electro1ysising water should be
arranged; when such measures as gas storage are taken to ensure gas supply without
interruption or synchronous overhaul with gas equipment, the standby installation may not
be arranged.
5.0.3 Such auxiliary equipment for raw material water preparation and alkaline solution
preparation required by the installation of hydrogen gas produced by electrolysising water
should be selected according to the following requirements:
1 The capacity of raw material water preparation device shall not be less than 4h raw
material water consumption; the volume of raw material water tank shall not be less than 8h
raw material water consumption; the water supply pressure of raw material water pump shall
be larger than the working pressure of hydrogen production device.
2 The materials of raw material water preparation device, water tank and its water
pump shall adopt non-contaminated raw material water and corrosion-resistant materials.
3 The volume of the alkaline solution tank shall be larger than the sum of all volumes
of each set of the installation of hydrogen gas produced by electrolysising water and alkaline
solution pipeline; the alkaline solution pump capacity may be determined according to the
alkaline solution volume and filling time required by each set of the installation of hydrogen
gas produced by electrolysising water.
5.0.4 The absorber set capacity and absorber quantity of the hydrogen purification system
by pressure swing adsorption shall be determined according to the following factors through
technical and economical comparison:
1 Pressure and composition of virgin gas, and purity, impurity content and pressure of
product hydrogen gas;
2 Consumption and use characteristics of product hydrogen gas;
3 Hydrogen gas recovery rate.
5.0.5 The capacity of the system of hydrogen gas produced by the methanol transforming
shall be determined according to the following factors:
1 Consumption and use characteristics of product hydrogen gas;
2 Purity, impurity content and pressure of product hydrogen gas;
3 Hydrogen gas recovery rate;
4 Storage and conveying of methanol shall meet the relevant national standard
requirements;
5 Field work conditions.
5.0.6 Hydrogen gas storage mode shall be determined according to the following factors
through technical and economical comparison:
1 Hydrogen station scale, hydrogen equipment consumption and use characteristics;
2 Hydrogen storage system input pressure and hydrogen supply pressure;
3 Field work conditions.
5.0.7 The type of the hydrogen gas receiver shall be determined according to the capacity
and pressure conditions of hydrogen gas to be stored. When the hydrogen gas pressure is
less than 6kPa, wet gas receiver shall be selected; when the hydrogen gas pressure is middle
or low pressure, and the single receiver capacity is larger than or equal to 5000Nm3,
spherical receiver should be adopted; when the hydrogen gas pressure is middle or low
pressure and the single receiver capacity is less than 5000Nm3, cylindrical receiver should
be adopted; when the hydrogen gas pressure is high pressure, long-pipe cylinder receiver
should be adopted.
5.0.8 The selection and quantity of hydrogen gas compressors shall be determined
according to gas inlet pressure, exhaust pressure, hydrogen gas purity and the maximum
hourly hydrogen gas consumption of the user or the use characteristics of the user. The
hydrogen gas compressors should not be less than 2 sets. Standby reciprocating hydrogen
gas compressor with continuous operation shall be arranged.
5.0.9 The model and discharge capacity of the compressor for hydrogen gas filling shall be
determined according to filling station or filling vessel specification, quantity, filling time,
gas inlet pressure, exhaust pressure, etc. Standby hydrogen gas compressor for filling may
not be arranged.
5.0.10 For purified hydrogen gas bottling, diaphragm compressor shall be adopted, and
empty cylinder treatment system should be arranged, including cylinder vacuum pumping
equipment and cylinder heating equipment.
5.0.11 The filling stations for hydrogen gas filling shall be arranged with two or more
groups, one for filling and one for cylinder reversion. The quantity of each group of
cylinders shall be determined according to the volume of hydrogen gas for export sales or
discharge capacity of hydrogen gas compressor for filling, and the hydrogen gas filling time.
according to the specifications of hydrogen gas receiver in device in this table.
6.0.3 The road used as fire lane in the process device of the hydrogen station shall
meet the following requirements:
1 Intercommunicated roads. When the device width is less than or equal to 60m
and the both sides out side the device are be equipped with fire lanes,
intercommunicated road shall not be arranged;
2 The road width shall not be less than 4m and the clearance height above road
surface shall not be less than 4.5m.
6.0.4 When arranging rooms with different fire hazard categories in the same building,
their separation walls shall be fire walls.
In the same building, the personnel concentrated room should be arranged in one end
with smaller fire hazard.
6.0.5 Rooms with explosion hazard in the hydrogen station shall be concentrated
arranged. The room with explosion hazard shall not directly connect to the room
without explosion hazard. If required, they shall be connected with corridor or
arranged with double-foyer.
6.0.6 Arrangement of electric control disks and instrument control disks in hydrogen
production room, hydrogen purification room and hydrogen gas compressor room shall meet
the following requirements:
1 Should be arranged in adjacent control room;
2 The control room shall be separated from the above-mentioned rooms with fire
walls.
6.0.7 When filling hydrogen and oxygen at the same time in the hydrogen station, the
arrangement of bottling room, etc. shall meet the following requirements:
1 Hydrogen gas bottling room, solid cylinder room and empty cylinder room as well
as oxygen bottling room, solid cylinder room and empty cylinder room shall be arranged
respectively;
2 The bottling room may be connected to the empty cylinder room and solid cylinder
room through door opening, and all shall be installed with independent exit and entrance.
6.0.8 When the hydrogen solid cylinders are not more than 60, solid cylinder, empty
cylinder and hydrogen filler or hydrogen busbar may be arranged in the same room,
however, solid cylinders must be stored separate from empty cylinders.
6.0.9 Hydrogen production device, hydrogen purification device or hydrogen gas
compressors of all kinds of models may be arranged in the same room.
6.0.10 When both hydrogen gas compressor and oxygen gas compressor are arranged
in the hydrogen station, they are not to be arranged in the same room.
6.0.11 The main passage in the water electrolysis hydrogen production room should not be
less than 2.5m; the clear spacing between water electrolyzers should not be less than 2.0m;
the clear spacing between water electrolyzer and wall should not be less than 1.5m. The
clear spacing between the water electrolyzer and its auxiliary equipments as well as the clear
spacing between auxiliary equipments shall be determined in accordance with technique
functions.
The plane layout spacing of the normal pressure installation of hydrogen gas produced
by electrolysising water shall be determined in accordance with specification, dimension and
overhaul requirements.
6.0.12 The clear spacing between hydrogen gas compressors should not be less than 1.5m
and the clear spacing between the hydrogen gas compressor and wall should not be less than
1.0m. When the specified clear spacing is unable to allow drawing out of components, then
the clear spacing shall be 0.5m longer than the component to be drawn out.
The clear spacing between hydrogen gas compressor and its auxiliary facilities may be
determined according to technical requirements.
6.0.13 The clear width of the main passage in hydrogen purification room should not be
less than 1.5m. All the clear spacing between purification equipments and that between
purification equipment and wall should not be less than 1.0m.
6.0.14 The clear width of the passage of hydrogen gas bottling room, solid cylinder room,
empty cylinder room and manifolds room shall be determined in accordance with the
transport mode of the cylinders but should not be less than 1.5m and measures keeping
cylinder standing shall be provided.
6.0.15 The coupling or the belt transmission part between the hydrogen gas compressor
and motor shall take safety protection measures. When belt transmission is adopted,
measures to conduct static out shall be taken.
6.0.16 The hydrogen gas receiver shall not be arranged in plant. In cold zone, the bottom
of the wet hydrogen gas receiver and that of the constant volume gas receiver containing wet
hydrogen shall take antifreezing measures.
7 Building Structure
7.0.1 The fire resistance grades of the hydrogen station and the hydrogen supply station
shall not be less than Grade II and the building should be of single layer.
7.0.2 The room with explosion hazard should adopt framework or bent structure bearing
load with reinforced column. When steel column is adopted for bearing, the steel column
shall be installed with fireproofing protection whose fire endurance shall not be less than
2.0h.
7.0.3 The room with explosion hazard in the hydrogen station and the hydrogen
supply station shall be arranged with pressure relief facilities in accordance with the
specifications of the current national standard GBJ 16 "Code of Design on Building
Fire Protection and Prevention".
7.0.4 The arrangement of the pressure relief facilities in the rooms with explosion hazard
in the hydrogen station and the hydrogen supply station shall meet the following
requirements:
1 Pressure relief facilities should adopt noncombustible lightweight roof as pressure
relief area. Door, window, lightweight wall that are easy to relief pressure may also be taken
as pressure relief area;
8 Electrical and Instrument Control
8.0.1 Power supply of the hydrogen station and the hydrogen supply station shall be
classified according to the load specified in the current national standard GB 50052 "Code
for Design of Electric Power Supply Systems". It should be Class III load except the one
would cause relatively large loss when hydrogen supply is interrupted.
8.0.2 The room with explosion hazard or electrical facilities inside the area shall meet
the specifications of the current national standard GB 50058 "Electrical Installations
Design Code for Explosive Atmospheres and Fire Hazard".
8.0.3 Electrical facilities selection in the environment with explosion hazard shall not
be lower than the grade and the classification of hydrogen explosive mixture (II CT1).
The electrical design and electrical equipments, line to ground of the environment with
explosion hazard shall be performed in accordance with the specifications of the
current national standard GB 50058 "Electrical Installations Design Code for
Explosive Atmospheres and Fire Hazard".
8.0.4 The lighting of the room with explosion hazard shall adopt flame-proof luminary, its
light source should adopt high-efficient light source such as fluorescent lamp. The luminaire
should be placed at relatively low spot and shall not be installed right above the hydrogen
releasing source.
Emergency lighting should be arranged in the hydrogen station.
8.0.5 Cable and wire laying in the environment with explosion hazard shall meet the
specifications of the current national standard GB 50217 "Code for Design of Cables of
Electric Work". The protection steel pipe for laying wire or cable must be separated
and sealed at the following places:
1 The place in front of the joint component of electrical equipment where wire
or cable is directed to;
2 The place between adjacent environments.
8.0.6 The room with explosion hazard shall be provided with hydrogen leakage
detecting and warning device and shall be interlocked with corresponding emergency
exhaust fan. When the hydrogen concentration in air reaching 0.4% (volume ratio), the
emergency exhaust fan shall be capable of opening automatically.
8.0.7 The hydrogen station shall be arranged with the following analytical instruments in
accordance with the requirements of the hydrogen production system:
1 Hydrogen gas purity analyzer (continuous);
2 Impurity content analyses of pure hydrogen and ultrapure hydrogen;
3 Virgin gas purity or component analysis;
4 The installation of hydrogen gas produced by electrolysising water shall be
arranged with on line analyzer of hydrogen gas content in oxygen and oxygen content
in hydrogen gas; when recycling oxygen, warning device for excess hydrogen gas
content in oxygen shall be arranged.
5 Analyzer of gas concentration in section of hydrogen production process shall be
arranged according to need.
8.0.8 The hydrogen station and the hydrogen supply station shall be arranged with the
following metering instruments as required:
1 Unstripped gas flowmeter;
2 Hydrogen gas flowmeter of product hydrogen gas or external hydrogen supply.
8.0.9 When the installation of hydrogen gas produced by electrolysising water is adopted
in the hydrogen station, the arrangement of direct current power supply of the water
electrolyzer shall meet the following requirements:
1 Each water electrolyzer shall adopt power supply of independent thyristor rectifier
or silicon rectifier. The rectifier shall be provided with voltage regulation function and
should be provided with automatic constant-current function;
2 The rectifier shall be equipped with special rectifier transformer. The one side of
the three-phase rectifier transformer winding shall be wired in triangle (△);
3 The harmonic interference from the rectifying device to the electrified wire netting
shall be performed in accordance with the relevant requirements of harmonic wave limited
by country.
8.0.10 The arrangement of direct current power supply of the system of hydrogen gas
produced by electrolysising water shall meet the following requirements:
1 High voltage rectifier transformer and saturable reactor shall be arranged in a
independent transformer room. The transformer room shall be designed meet the
specifications of the current national standard GB 50053 "Code for Design of 10kV &
Under Electric Substation";
2 When the rectifier transformer room is far away from the high-voltage distribution
room, the high-voltage inlet wire side should be arranged with load switch or disconnecting
switch;
3 Rectifier or a complete set of low voltage rectifying device shall be arranged inside
the source chamber next to the tank room. The power supply room shall be designed meet
the specifications of the current national standard GB 50054 "Code for Design of Low
Voltage Electrical Installations";
4 Direct current circuit shall adopt copper conductor and should be laid at relatively
low spot or in a trench. When bare busbar is required to be adopted, measures to prevent
generating sparks shall be provided;
5 The tank room shall be arranged with emergency power off button of direct current
power supply, the button should be arranged in the place convenient for operation.
8.0.11 Communication signal shall be arranged between the hydrogen gas bottling room
and the hydrogen gas compressor room.
8.0.12 The hydrogen station and the hydrogen supply station shall be provided with the
following main pressure inspection items:
1 Hydrogen gas pressure at the outlet of the station house;
2 Pressure of hydrogen gas receiver;
3 Display and regulation of outlet pressure of hydrogen production device;
4 Control and regulation of hydrogen side and oxygen side pressures and pressure
difference of the installation of hydrogen gas produced by electrolysising water;
5 The pressure display and adsorbent pressure regulation o......
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