This standard specifies the technical requirements for the process, equipment and facilities of bulk liquid chemical products during port loading and unloading and transshipment. This standard is applicable to coastal and inland ports and docks. GB/T 15626-1995 Technical requirements for bulk liquid chemical products port loading and unloading GB/T15626-1995 Standard download decompression password: www.bzxz.net

UDC 656.615.073.2:66-911.4
National Standard of the People's Republic of China
GB/T15626-1995
Technical requirements for port handling of liquid chemicals in bulkIssued on July 17, 1995
State Administration of Technical Supervision
Implementation on April 1, 1996
National Standard of the People's Republic of China
Technical requirements for port handling of liquid chemicals in bulkSubject content and scope of application
GB/T15626-1995
This standard specifies the technical requirements for processes, equipment and facilities for the loading and unloading and transshipment of bulk liquid chemicals at ports. This standard applies to coastal and inland ports and docks, and the reference standard is GB6944. 3 Terms Classification and product name number of dangerous goods Liquid chemicals in bulk refers to flammable liquids, some toxic and infectious substances, and corrosive substances transported by chemical ships (see GB6944). 4 Loading and unloading requirements 4.1 Process requirements 4.1.1 According to the characteristics of the loading and unloading medium and the operating conditions, the operation methods of gravity or pump pressure loading, loading on ships, direct loading from car to ship, and from ship to car, or entering tanks can be adopted. 4.1.2 Liquid chemicals that are harmful to the human body and easy to cause environmental pollution should not stay in the port for a long time, and the operation method of direct loading from car to ship should be adopted.
4.1.3 The opening of the train tank car should be sealed during loading and unloading operations. 4.1.4 The temperature of the operating medium should meet the physical and chemical properties of the medium for storage and transportation safety. 4.1.5 The operators participating in loading and unloading must wear appropriate protective equipment, and the site must have emergency safety measures for loading and unloading of highly toxic media.
4.1.6 Before working with flammable liquids, the loading and unloading personnel should eliminate human static electricity and wear anti-static clothing. During operation, explosion-proof tools and lighting equipment approved by relevant national departments must be used, and knocking and collision are strictly prohibited when contacting steel equipment. 4.1.7 Before ship operations, both the shore and the ship must confirm the safety measures. During the operation, pay close attention to the operation dynamics to prevent leakage and overflow of the medium. If it is necessary to change tanks or tanks, the empty tanks or tanks should be opened first, and then the full tanks or tanks should be closed. 4.2 Flow rate requirements
4.2.1 During the loading and unloading of flammable liquids, the flow rate in the pipeline shall not exceed 1m/s, and the normal operation flow rate shall not exceed 3m/s. 4.2.2 Other liquid products may use an economic flow rate. 4.3 Pipeline cleaning requirements
4.3.1 After the loading and unloading operation, the remaining medium in the pipeline should be cleaned. 4.3.2 The pipeline of flammable liquids should be cleaned by pump suction or nitrogen. 4.4 Facility requirements
Approved by the State Administration of Technical Supervision on July 17, 1995, and implemented on April 1, 1996
GB/T15626-1995
4.4.1 For liquid chemicals that should be stored in floating roof tanks, if such equipment is not available, nitrogen can be used to cover the tank according to the characteristics of the medium. The purity of the nitrogen should be determined according to the characteristics of the stored medium. 4.4.2 The capacity of the storage tank should be able to meet the maximum amount of loading and unloading at one time. 4.4.3 Storage tanks, pumps, pipelines and other equipment should be complete, and running, bubbling, dripping and leaking are strictly prohibited. 4.4.4 Special pipes should be used for loading and unloading of bulk liquid chemicals. If a pipe needs to be used for multiple purposes, it must have complete cleaning methods. 4.4.5 For loading and unloading of bulk liquid chemicals, an open pump room should be used. For closed pump rooms, sufficient ventilation measures should be provided, and the pump room should be isolated from the operation room and the power distribution room.
5 Loading and unloading equipment
5.1 Pumps
5.1.1 General principles for selecting pumps
5.1.1.1 The flow rate should be determined by comprehensively considering the coordinated balance of the capacity of storage tanks, pipelines, train tank cars, ships and other equipment and the storage and transportation cycle. The determined flow rate should have a certain margin.
5.1.1.2 The pump head should not be less than 1.1 times the design head of the conveying medium. 5.1.1.3 The selection of driving equipment should consider the flammability and explosion requirements of the medium gas and the surplus of the corresponding driving power. Generally, electric drive is selected.
The use of vacuum pumps in conjunction with centrifugal pumps will increase the emission of toxic gases when unloading, and environmental protection measures should be considered. 5.1.1.4
5.1.1.5 The transportation of toxic substances must ensure sealing. The sealing device should be determined according to the nature of the chemical products. Soft fillers, single-end or double-end mechanical seals can be used. The material of the seal should be resistant to corrosion, wear, high and low temperatures, and mechanical pressure. 5.1.1.6 For the parts of the pump flow channel that are in direct contact with the medium, it should be considered that the material should not react physically or chemically with the medium being transported. 5.1.1.7
The pipe resistance at the pump inlet should be minimized to avoid cavitation and vibration. 5.1.1.8 The temperature of some liquid chemicals should be strictly controlled during transportation, and the process configuration of pumps, valves, and pipelines should have a pressure relief and reflux system for abnormal situations. When there is no operation, the medium should not be stored in the pump or pipeline. 5.1.1.9 The use of seals should take into account the physical and chemical properties of the medium, the maximum and minimum sealing pressures, the temperature of the sealing point, the vapor pressure of the liquid, and the speed of the machine. For mechanical seals with external flushing and cooling, it should be ensured that the pumped medium does not mix with the mechanical seal coolant, and the coolant pressure is generally not greater than the pumped medium pressure. bZxz.net
5.1.2 Centrifugal pumps
5.1.2.1 Centrifugal pumps are suitable for media with a viscosity of less than 650cSt. 5.1.2.2 For small flow and high head, general centrifugal pumps should not be used, and multi-stage centrifugal pumps should be used. 5.1.2.3 For medium with dissolved or entrained gas volume greater than 5% (volume ratio), general centrifugal pumps should not be used, and self-priming centrifugal pumps can be used. 5.1.2.4 For large flow and small head changes, centrifugal pumps with flat QH curves should be used, otherwise centrifugal pumps with steep QH curves should be used. 5.1.2.5 For solid particles exceeding 3%, centrifugal pumps with special structures should be used. 5.1.3 Positive displacement pumps
5.1.3.1 Positive displacement pumps are suitable for medium viscosity less than 10.000cSt. 5.1.3.2 For medium with dissolved or entrained gas volume greater than 5% (volume ratio), positive displacement pumps can be used. 5.1.3.3 For small flow and high head, reciprocating positive displacement pumps should be used. 5.1.3.4 Rotor positive displacement pumps should not be used for media with poor lubrication performance, but reciprocating positive displacement pumps should be used. 5.2 Terminal equipment
5.2.1 Metal hoses or infusion arms should be used for liquid chemical loading and unloading ships. The selection and installation of infusion arms should take into account the flow direction and pulsation of the ship and liquid. The material of the infusion arm should be resistant to medium corrosion. The relationship between the infusion arm caliber and operation mode and the ship is shown in Table 1. Preface
GB/T15626-1995
Table 1 Relationship between the caliber and operation mode of the infusion arm and the ship Ship (ton class)
Below 10,000 tons
10,000 to 50,000 tons
50,000 to 100,000 tons
Caliber of infusion arm, mm
150 to 200
200 to 300
300 to 400
5.2.2 The infusion arm should be equipped with an emergency detachment device from the ship to prepare for the ship to leave the dock as soon as possible in case of abnormal circumstances. 5.2.3
Operation mode
Manual or hydraulic drive
Manual or hydraulic drive
Hydraulic drive
The dock should be equipped with a manual or automatic pump stop system and an emergency pressure relief reflux device to prevent water hammer and accidents. 5.2.4 The wharf must be equipped with fresh water, fire-fighting equipment and electrostatic grounding facilities. 5.2.5 The wharf should have corresponding chemical wastewater receiving facilities and water surface pollution prevention facilities. 5.3 Storage tanks
5.3.1 Metal storage tanks and storage tank accessories of different types and materials should be selected according to the flammability, toxicity, corrosiveness and other characteristics of liquid chemicals.
5.3.2 Benzene, alcohols, ethers, and other volatile and toxic liquid chemicals should use steel floating roof tanks or dome tanks. Dome tanks should be equipped with gas recovery devices or nitrogen capping facilities. 5.3.3 Liquid alkali, glacial acetic acid, coal tar, sulfuric acid, ethylene tar, etc. should use steel dome tanks. 5.3.4 Containers for storing bulk liquid chemicals should be ground vertical or horizontal metal tanks. Stainless steel tanks are required for storage media, but carbon steel tanks can be used if this condition is not met. The inner wall of the tank must be painted or lined. 5.3.5 Liquid chemical storage tanks should be equipped with instrumentation such as liquid level detection, temperature detection, and liquid level alarm. 5.3.6 Depending on climatic conditions, some liquid chemical storage tanks should be equipped with spraying devices. 5.3.7 The operation site and tank area should be equipped with reliable lightning protection devices, and the storage tanks and pipelines should have good electrostatic grounding devices. 5.4 Pipelines
5.4.1 The material of the pipeline should be based on the characteristics, pressure and temperature of the conveying medium. Carbon steel pipes, lead pipes, lead alloy pipes, aluminum pipes, aluminum alloy pipes, stainless steel pipes, composite pipes, etc. can be selected. The calculation of pipe wall thickness and the selection of corrosion allowance can refer to the "Chemical Process Design Manual". 5.4.2 The connection of the pipeline should be based on the characteristics of the medium and the conditions of use. Welding, flange connection, threaded connection, and clamp connection can be selected to ensure reliable connection and convenient operation.
5.4.3 For pipelines that move frequently and hard pipelines connected to storage tanks, pumps and other equipment, metal hoses, rubber short-circuits or rubber hoses should be selected according to the characteristics of the conveying medium and the conditions of use. 5.4.4 Technical requirements for pipe fittings
5.4.4.1 The selection of valves and flange pipe clamps should be based on the characteristics, temperature, pressure and other factors of the medium. 5.4.4.2 The selection of gaskets should be based on the characteristics, temperature, pressure and other factors of the medium. 5.4.5 Thermal compensation of pipelines
5.4.5.1 In addition to natural compensation, the loading and unloading pipelines of bulk liquid chemicals can also use bellows compensators and other compensation. 5.4.5.2 The selection of bellows compensators should be based on comprehensive consideration of factors such as working pressure, operating temperature, medium characteristics, medium flow direction, installation location, compensation distance, atmospheric environment, etc.
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the Transport Management Department of the Ministry of Transport. This standard was drafted by Dalian Port Authority and the Standards and Metrology Institute of the Ministry of Transport. The main drafters of this standard are Qu Tingbin, Zhang Renguo, Qin Xiaoyong, Wang Faqing, Tang Weiwen, Sun Dequan, and Li Shouxi.
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