GB/T 34542.1-2017Storage and transportation systems for gaseous hydrogen—Part 1: General requirements (English PDF)

3.1 Storage and transportation systems for gaseous hydrogen

Gaseous hydrogen storage systems, gaseous hydrogen transportation systems, gaseous hydrogen compression systems, gaseous hydrogen filling systems, and their combined systems.

3.2 Stationary storage systems for gaseous hydrogen

Gaseous hydrogen storage systems with fixed installation and use locations.

3.3 Mobile storage systems for gaseous hydrogen

A gaseous hydrogen storage system mounted on one or more movable bases.

3.4 Safety accessories

Safety devices installed on the system or equipment to ensure the safe operation of the system, including overpressure relief devices, emergency shut-off devices, safety interlock devices, flame arresters, etc.

4.2 Overall design

4.2.1 Location

4.2.1.1 The fire protection distance between the system and buildings and structures outside the system shall comply with the requirements of GB 50177 and GB 50516.

4.2.1.2 The laying of hydrogen pipelines shall comply with the provisions of GB 50177 and GB 50516.

4.2.1.3 The system shall be isolated from the storage systems of flammable gases, oxygen, halogen gases, etc., and shall comply with the requirements of relevant specifications and standards.

4.2.2 Plane layout

The system's layout shall comply with the requirements of GB 50177, GB 50516 and GB/T 29729.

4.2.3 Buildings

4.2.3.1 The building where the system is installed shall be a single-storey building with a fire-resistance rating not lower than Class II and a lightning protection classification not lower than the secondary lightning-proof building.

4.2.3.2 Open flame heating is strictly prohibited in the explosion hazard area of the system.

4.2.3.3 Fire-fighting equipment and fire-fighting water supply systems shall be installed in the system area in accordance with the provisions of GB 50516 and GB 50177.

4.2.3.4 Explosion-hazardous areas of the system, especially at the entrance, shall be marked with permanent signs in accordance with the provisions of GB 2894 to indicate their dangers, such as hydrogen-flammable gas, and open flames strictly prohibited.

4.2.3.5 There shall be no debris in the explosion hazard area of the system to ensure that the fire escape passages are unobstructed.

4.2.3.6 Rooms with explosion hazards within the system shall meet the following requirements:

a) There shall be good ventilation in the room; the inner surface of the ceiling shall be flat, and dead corners shall be avoided, and hydrogen shall not accumulate;

b) The pressure relief facilities shall be installed on the exterior wall or roof, and the calculation of the pressure relief area shall comply with the provisions of GB 50516;

c) Rooms with explosion hazards shall not be directly connected to rooms without explosion hazards. If they must be connected, they shall be connected by corridors or double foyers;

d) In rooms with explosion hazards, a hydrogen detection and alarm instrument shall be installed and interlocked with the corresponding emergency exhaust fan.

4.2.4 Materials

4.2.4.1 When selecting system materials, the use conditions (such as hydrogen purity, operating temperature, working pressure, and operating characteristics), material properties (mechanical properties, process properties, physical properties and chemical properties), equipment manufacturing process and economic rationality shall be comprehensively considered.

4.2.4.2 The quality, specifications and markings of the materials used in the system shall comply with the national standards or industry standards for the corresponding materials, and the materials in direct contact with hydrogen shall have good compatibility with hydrogen.

4.2.4.3 When a material is used in a compressed hydrogen environment for the first time, or when performance data in a compressed hydrogen environment is lacking, a material compatibility test with hydrogen shall be carried out within the range of hydrogen composition, temperature and pressure equivalent to the use conditions.

4.2.4.4 Equipment supports, pipe supports, covers, etc. in the system shall be made of non-combustible materials.

4.2.5 Equipment

4.2.5.1 The materials, design, manufacture, installation, modification, repair, use, inspection and safety accessories and instruments of the pressure vessels in the system shall comply with the requirements of TSG 21 and TSG R0005.

4.2.5.2 The materials, design, manufacture, accessories, filling, use and periodic inspection of gas cylinders in the system shall comply with the requirements of TSG R0006 and TSG R0009.

4.2.5.3 Hydrogen storage containers, hydrogen compressors, and other equipment shall comply with the requirements of GB/T 29729.

4.2.5.4 The hydrogen compressor shall be equipped with a device to monitor the inlet

g) Overpressure alarm or low-pressure alarm device.

4.3 Safety accessories and instruments

4.3.2 Safety accessories and instruments shall be inspected regularly in accordance with the provisions of TSG 21 and TSG R0006.

4.3.3 The overpressure relief device shall be able to prevent the pressure in the pressure equipment or system from exceeding its maximum allowable working pressure.

4.3.4 It is generally not advisable to install a stop valve between the overpressure relief device and the protected system. When a stop valve is installed, it shall be fully open (sealed or locked) during normal operation of the system, and the structure and diameter of the stop valve shall not hinder the safe release of the overpressure relief device.

4.3.5 Hydrogen discharge pipelines shall be equipped with flame arresters. The setting of flame arresters shall comply with the relevant provisions of GB 50177.

4.3.6 Hydrogen detection and alarm instruments should be installed in locations where hydrogen leakage and accumulation are likely to occur. The selection shall take into account factors such as accuracy, reliability, maintainability, detection range, and response time, and comply with the relevant provisions of GB 12358 and GB 16808.

4.3.7 Hydrogen flame detection and alarm instruments should be installed in locations where hydrogen leakage and accumulation are likely to occur. The locations shall be selected based on factors such as response time, detection distance, coverage, and sensitivity, and comply with the provisions of GB 50058.

4.3.8 Lightning protection and anti-static devices shall comply with the relevant provisions of GB 50177 and GB 50058, and there shall be no less than 2 grounding points.

4.3.9 The system can be equipped with a gas filtration device, online hydrogen purity analyzer, online hydrogen leakage alarm instrument, online hydrogen humidity instrument, etc. according to process requirements.

4.3.10 When the instrument or controller used is electrical equipment, an anti-static device shall be installed and the grounding resistance shall be tested regularly.

4.3.11 The system shall be equipped with overpressure alarm and low-pressure alarm devices according to different pressure levels.

4.4 Installation and debugging

4.4.1 Installation

The installation shall be carried out in accordance with the requirements of the product manual and design documents; the position shall be accurate, the fixation shall be stable and reliable, and the pipes and accessories shall be installed correctly.

4.4.2 Experiment

4.4.2.1 The system used for the first time or after overhaul shall be subjected to a pressure test, air tightness test and leakage test in accordance with the provisions of GB 50516 and GB 50177, and may be put into use only after meeting the requirements.

4.4.2.2 Before testing the system, the user shall verify its consistency with the design documents and the valid qualification certificates of special equipment such as pressure vessels, gas cylinders, and pressure pipelines.

4.4.2.3 The pressure test should be carried out by a hydraulic pressure test. If it is not suitable to carry out a hydraulic pressure test, the air pressure test may be used.

4.4.3 Replacement

4.4.3.1 The system shall be replaced as required before it is put into operation. After replacement, sampling and analysis shall be carried out, and the oxygen content shall not exceed 0.5%.

4.4.3.2 Before hot work during system maintenance or before and after long-term shutdown, replacement shall be carried out in accordance with regulations. After replacement, sampling and analysis shall be carried out, and the hydrogen content shall not exceed 0.4%.

4.4.4 Power on When the system reaches the operating pressure, all joints shall be leak tested to ensure air tightness in the compressed hydrogen environment.

4.4.5 Operation

4.4.5.1 When working, operators shall wear flame-retardant and anti-static work clothes that comply with GB 12014 and anti-static shoes that comply with GB 21146. Work clothes should be separate upper and lower body parts and easy to take off. It is strictly forbidden to put on or take off clothes, shoes or similar items in explosion-hazardous areas. It is strictly forbidden to bring fire sources or non-explosion-proof electronic equipment into explosion-hazardous areas.

4.4.5.2 The double-post operation should be adopted for the system. If single-person operation is required, an effective alarm and distress call device shall be provided and inspected regularly. […]