Before installing the gas flow meter, check whether the following items meet the requirements:
(1) Check whether the diameter of the gas flowmeter pipe meets the design requirements.
(2) Check if the diameter of the gas flowmeter meets the design requirements.
(3) The inner diameter of the gasket used in the gas flowmeter shall not be less than the diameter of the pipe, which may be 2-3 mm larger than the pipe diameter.
(4) The gas flowmeter must be perpendicular to the pipe after welding with a flange and must not be skewed. The center of the flange and the center of the pipe should coincide, requiring the weld to be smooth.
(5) Before and after the pipeline of the gas flow meter, there is no obvious uneven lug in the distance of at least 2 times the diameter of the pipeline. There is no electricity, gas welding slag, exposed pipe joints, etc.
(6) When the ring chamber is pressed, the diameter of the ring chamber shall not be smaller than the diameter of the pipe, which may be slightly larger than the pipe diameter.
(7) The flowmeter, ring chamber and flange should be cleaned of dirt and oil before installation, and be careful not to damage the sharp edge of the hole.
The gas flowmeter installation should be carried out after the pipeline is purged and before the pressure test, so as to prevent the dirt in the pipeline from damaging the gas flowmeter or clogging the pressure tap.
The following requirements are required for specific installation and construction:
(1) The direction of installation of the gas flowmeter must be such that the cylindrical orifice of the flowmeter faces the direction of flow. The orientation of the pressure gauge of the gas flowmeter should meet the design requirements.
(2) The center of the gas flow meter and gasket must coincide with the center of the pipe, and the eccentricity must not exceed the relevant regulations.
(3) A shut-off valve must be installed on the pilot pipe close to the gas flow meter. This valve must not be placed behind the isolation tank or condensate tank.
(4) The gas flow meter is a concealed project. There should be a concealed construction record.
(5) The calculation data of the design and change of the gas flow meter should have complete original data.
Gas flow meter installed in gas flow metering differential pressure transmitter
(1) Check the appearance of the transmitter before installation. Check the differential pressure transmitter housing for damage, corrosion and other faults. Find the problem and deal with it in time. Check the transmitter internally and check if the transmitter connector is clean. Components, spare parts, connectors are defective, broken, deformed, corroded and poorly sealed, and problems are found to be repaired and replaced in time.
(2) The transmitter is connected to the outside world to check the interface of the transmitter, and the terminal block, wiring screw, screw hole, junction box seal and transmitter cover seal in the junction box are not broken, cracked, or damaged. If the aging fails, etc., find the problem and deal with it in time.
(3) Check the transmitter line, check the insulation resistance between the transmitter terminal and the outer casing with a 500 V megger. The electric wind value should be above 20 MΩ.
After the final verification is passed, it can be officially installed.
Its pilot line installation requirements are:
(1) The inner diameter of the pressure guiding pipe is not less than 6 mm. When the length of the pressure guiding pipe exceeds 16 m, or the viscosity of the medium is large, the pipe diameter should be increased. For example, the medium viscosity oil, the length of the pressure guiding pipe is 45. Below the meter, the inner diameter of the pressure guiding tube can be selected from 18 to 20 mm.
(2) The length is preferably within 16 m, and the pressure guiding tube should be laid vertically (horizontal and vertical) or inclined (the inclination is not less than 1:12).
(3) When the length of the pressure guiding tube exceeds 30 m, the pressure guiding tube should be inclined in sections. The positive and negative pressure guiding pipes should be laid as close as possible to the parallel. If there is a condensing tank, the condensing tanks at the positive pressure end and the negative pressure end should be as close as possible.
(4) For the case where the gas medium is easy to solidify and the gas medium is easy to liquefy or entrain liquid, different insulation measures should be adopted according to the conditions of the ambient temperature. For example, the pressure guiding pipeline in the north of the Great Wall can be associated with heat. The North China region can be lightly accompanied by heat, and the Yangtze River basin can only be insulated with heat.
(5) There should be a shut-off valve on the pressure guiding line. The structure of the shut-off valve should ensure that the flow path is unobstructed and the valve is not bent as much as possible to prevent the accumulation of gas or liquid in the valve body. For high temperature and high pressure media such as steam, in order to ensure safe operation, a three-valve assembly must be placed near the differential pressure transmitter to be used.
(6) When there is a possibility of trapping liquid or gas or dirt on the pressure line, a gas collection tank (or exhaust valve), a condensation tank and a settling tank should be installed. When the signal line is long (more than 30 m) , the section should be inclined and installed in each section of the gas tank (or exhaust valve) and settling tank. Various accessories can be used alone or in combination.
(7) After the installation of the pressure guiding pipeline system, the system must be purged by the process pipeline purging machine. When the pressure guiding pipe is fully purged with steam, it should be noted that the differential pressure transmitter must be The positive and negative pressure valves of the valve block are closed to prevent high temperature steam from entering the differential pressure transmitter measuring chamber. The dirt, soldering and air in the positive and negative pressure lines are discharged through the drain valves of the positive and negative pressure lines of the transmitter. The petrochemical plant is generally purged with steam, and then replaced with nitrogen to replace the water and oxygen. If necessary, the general pressure-conducting pipeline is also purged and replaced by a process sweeper.
(1) Check whether the diameter of the gas flowmeter pipe meets the design requirements.
(2) Check if the diameter of the gas flowmeter meets the design requirements.
(3) The inner diameter of the gasket used in the gas flowmeter shall not be less than the diameter of the pipe, which may be 2-3 mm larger than the pipe diameter.
(4) The gas flowmeter must be perpendicular to the pipe after welding with a flange and must not be skewed. The center of the flange and the center of the pipe should coincide, requiring the weld to be smooth.
(5) Before and after the pipeline of the gas flow meter, there is no obvious uneven lug in the distance of at least 2 times the diameter of the pipeline. There is no electricity, gas welding slag, exposed pipe joints, etc.
(6) When the ring chamber is pressed, the diameter of the ring chamber shall not be smaller than the diameter of the pipe, which may be slightly larger than the pipe diameter.
(7) The flowmeter, ring chamber and flange should be cleaned of dirt and oil before installation, and be careful not to damage the sharp edge of the hole.
The gas flowmeter installation should be carried out after the pipeline is purged and before the pressure test, so as to prevent the dirt in the pipeline from damaging the gas flowmeter or clogging the pressure tap.
The following requirements are required for specific installation and construction:
(1) The direction of installation of the gas flowmeter must be such that the cylindrical orifice of the flowmeter faces the direction of flow. The orientation of the pressure gauge of the gas flowmeter should meet the design requirements.
(2) The center of the gas flow meter and gasket must coincide with the center of the pipe, and the eccentricity must not exceed the relevant regulations.
(3) A shut-off valve must be installed on the pilot pipe close to the gas flow meter. This valve must not be placed behind the isolation tank or condensate tank.
(4) The gas flow meter is a concealed project. There should be a concealed construction record.
(5) The calculation data of the design and change of the gas flow meter should have complete original data.
Gas flow meter installed in gas flow metering differential pressure transmitter
(1) Check the appearance of the transmitter before installation. Check the differential pressure transmitter housing for damage, corrosion and other faults. Find the problem and deal with it in time. Check the transmitter internally and check if the transmitter connector is clean. Components, spare parts, connectors are defective, broken, deformed, corroded and poorly sealed, and problems are found to be repaired and replaced in time.
(2) The transmitter is connected to the outside world to check the interface of the transmitter, and the terminal block, wiring screw, screw hole, junction box seal and transmitter cover seal in the junction box are not broken, cracked, or damaged. If the aging fails, etc., find the problem and deal with it in time.
(3) Check the transmitter line, check the insulation resistance between the transmitter terminal and the outer casing with a 500 V megger. The electric wind value should be above 20 MΩ.
After the final verification is passed, it can be officially installed.
Its pilot line installation requirements are:
(1) The inner diameter of the pressure guiding pipe is not less than 6 mm. When the length of the pressure guiding pipe exceeds 16 m, or the viscosity of the medium is large, the pipe diameter should be increased. For example, the medium viscosity oil, the length of the pressure guiding pipe is 45. Below the meter, the inner diameter of the pressure guiding tube can be selected from 18 to 20 mm.
(2) The length is preferably within 16 m, and the pressure guiding tube should be laid vertically (horizontal and vertical) or inclined (the inclination is not less than 1:12).
(3) When the length of the pressure guiding tube exceeds 30 m, the pressure guiding tube should be inclined in sections. The positive and negative pressure guiding pipes should be laid as close as possible to the parallel. If there is a condensing tank, the condensing tanks at the positive pressure end and the negative pressure end should be as close as possible.
(4) For the case where the gas medium is easy to solidify and the gas medium is easy to liquefy or entrain liquid, different insulation measures should be adopted according to the conditions of the ambient temperature. For example, the pressure guiding pipeline in the north of the Great Wall can be associated with heat. The North China region can be lightly accompanied by heat, and the Yangtze River basin can only be insulated with heat.
(5) There should be a shut-off valve on the pressure guiding line. The structure of the shut-off valve should ensure that the flow path is unobstructed and the valve is not bent as much as possible to prevent the accumulation of gas or liquid in the valve body. For high temperature and high pressure media such as steam, in order to ensure safe operation, a three-valve assembly must be placed near the differential pressure transmitter to be used.
(6) When there is a possibility of trapping liquid or gas or dirt on the pressure line, a gas collection tank (or exhaust valve), a condensation tank and a settling tank should be installed. When the signal line is long (more than 30 m) , the section should be inclined and installed in each section of the gas tank (or exhaust valve) and settling tank. Various accessories can be used alone or in combination.
(7) After the installation of the pressure guiding pipeline system, the system must be purged by the process pipeline purging machine. When the pressure guiding pipe is fully purged with steam, it should be noted that the differential pressure transmitter must be The positive and negative pressure valves of the valve block are closed to prevent high temperature steam from entering the differential pressure transmitter measuring chamber. The dirt, soldering and air in the positive and negative pressure lines are discharged through the drain valves of the positive and negative pressure lines of the transmitter. The petrochemical plant is generally purged with steam, and then replaced with nitrogen to replace the water and oxygen. If necessary, the general pressure-conducting pipeline is also purged and replaced by a process sweeper.
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