Safe operation of valve equipment piping in clean room refrigeration system
Safe operation of valve equipment piping in clean room refrigeration system
Valve is an indispensable part to control the safe operation of the refrigeration system. There should be a certain number of regulating valves, shut-off valves and spare valves in the refrigeration system; when filling the container with refrigerant, the opening operation of the valve should be opened slowly , too fast loading speed can make...
Text label: clean room refrigeration system, safe operation of valve piping equipment
Safe operation of valve equipment and piping of clean room refrigeration system
Valve is an indispensable part to control the safe operation of the refrigeration system. There should be a certain number of regulating valves, shut-off valves and spare valves in the refrigeration system; when filling the container with refrigerant, the opening operation of the valve should be opened slowly , too fast loading speed will make the potential original micro-defects of the equipment, there is not enough time to generate the slip process, and the strain rate increases in the root area of u200bu200bthe notch, thereby reducing the fracture toughness of the material and easily causing damage; in the refrigeration system, For pipelines and equipment with liquid refrigerant, it is strictly forbidden to close the valves at both ends at the same time. Especially in the working state, the pipelines such as the liquid supply pipe, the liquid discharge pipe, and the liquid refrigerant adjustment station are generally filled with liquid, and should be closed before the shutdown. Carry out proper evacuation; at least one of the valves at both ends of the pipeline filled with refrigerant must be open. Similarly, when the air cooler is flushing with water, it is strictly forbidden to close all the return valve and drain valve on the distribution station. During the operation of the refrigeration system, special attention should be paid to the parts where liquid explosion may occur: the liquid pipeline between the condenser and the liquid receiver; the liquid pipeline with stop valves at both ends; the pipeline between the high-pressure liquid receiver and the expansion valve; Level gauges for high pressure equipment; liquid balance pipes between ammonia containers; liquid distribution stations; lines from the outlet valve of the circulating reservoir to the suction side of the ammonia pump; supply lines for the ammonia pump; from the container to the emergency ammonia leaker The liquid pipelines, etc., are all pipelines that may cause liquid seals.
When opening the valve, in order to prevent the valve core from being stuck by the valve body, it is required that the handwheel should not be turned with excessive force. When the valve is fully opened, the handwheel should be rotated about 1/8 turn; The drain valve should be closed at ordinary times, and the lead seal should be added or the handwheel should be removed. The pipe joints connected to the atmosphere should be covered with a stuffy cover. On the handwheels of all control valves, open and close signs can be hung, and the valves on the regulating station should be marked to control a certain The sign of the cold room or a certain equipment, it is best to mark the flow direction arrow of the refrigerant on all the pipes close to the valve; the moving parts in the refrigeration system, such as transmission belts, couplings, etc., should be equipped with protective devices, otherwise movement is prohibited, in order to prevent The low-pressure and low-temperature pipelines are affected by pressure fluctuations and temperature changes during defrosting. It is stipulated that the pressure before entering the evaporator should not exceed 7.84*105pa. It is forbidden to close the condenser inlet valve to speed up the defrosting speed. In order to prevent high-temperature and high-pressure gas refrigerant from entering the warehouse and causing a sudden increase in the load of the machine, it is stipulated that the liquid level of the accumulator shall not be lower than its radial height by 30%; Condensation pressure will worsen the operating conditions of the system, and the page of the liquid receiver shall not exceed 80% of the radial height; when the room temperature between the equipment reaches the freezing point temperature, for all cooling water equipment, the remaining water should be removed when it is stopped. Put it away to prevent frost cracking. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.
When inspecting and repairing the machinery, equipment and valves in the machine room and pump clean room modular, the lighting power supply with a voltage below 36V must be used, and the lighting power supply with a voltage below 12V should be used in humid areas; Pipelines or new pipelines must be made of seamless steel pipes that meet the regulations, and seamed pipes and plumbing fittings are strictly prohibited; after the refrigeration system is overhauled, compressive strength and air tightness tests should be carried out. After the equipment is welded or connected to pipes , the air tightness test should be carried out, and it is allowed to be used after passing the test; the newly built or overhauled refrigeration system must undergo air tightness test, leak detection, sewage discharge, and vacuuming. When it is confirmed that there is no leakage in the system, the tank can be filled with refrigerant.
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