Cooling pipe installation
1 scope
The technology standard is applicable to refrigeration system working pressure is lower than 2 mpa, temperature within 150 ~ ~ 20 ℃, transmission medium for refrigerant and oil pipe installation project.
2 construction preparation
2.1 material and main equipments
2.1.1 adopted by the pipe and the welding material should comply with the design rules, and have factory qualified certification qualification documents.
2.1.2 refrigeration system of all kinds of valve parts must use special products, and have the factory certificate.
2.1.3 seamless steel tube inside and outside surface should be no significant corrosion, no crack, double skin defects and concave and convex inequality.
2.1.4 brass inside and outside the wall should be bright and clean, and without hole, crack, scarring, spallation or defects such as gas pool.
2.1.5 construction machinery, hoist, air compressor, vacuum pump, hand wheel, grinding wheel cutting machine, pressure table, chain hoist, bench drill, hammer, groove machine, brass plate edge machine, hand saw, cover silk, plate, box spanner socket wrench, ring spanner, active board, spirit level, hammers, welding equipment, etc.
2.1.6 measuring tool: the steel ruler, steel tape, square, semiconductor thermometer, pressure gauge, etc.
2.2 operation conditions
2.2.1 complete design drawings, technical documents, refrigeration technology and construction procedures.
2.2.2 building structure engineering construction, interior decoration, complete basic and pipeline connection equipment installed to look for is finished, pipeline through the structural parts of the holes have been reserved, size is correct. Embedded parts set appropriate so as to meet the requirements of refrigeration pipeline construction.
2.2.3 construction preparation work is done, the material sent to the scene.
3 operation process
3.1 process:
Preview to construction preparation, pipeline installation and system such as blowing - system tightness test -
System vacuum - pipeline corrosion - refrigerant filling and inspection
3.2 the construction preparation
3.2.1, familiar with drawings and technical data about the quality of technological process, construction procedures and technical requirements.
3.2.2 according to construction drawing pipe position, you high, as is shown in steam-water measuring unreeling, find out the embedded iron.
3.2.3 valve of cooling system, before the installation, should according to the design requirements to undertake checking checking to types, specifications, and in accordance with the requirements stated in the specification cleaning and leak test.
3.2.4 refrigerants and lubricating oil system of pipes, pipe fittings should be rust and dirt clean inside and outside the wall, in addition to the rust of pipe nozzle should be closed, and keep inside and outside the wall is dry.
3.2.5 according to the regulations of the design, prefabrication cradle, insulation pipe, support the applied by contact with the pipe anticorrosion treated soil cushion and heat insulation. Wood cushion thickness should be the same as the insulation layer thickness. Type of steam-water spacing are shown in table 4 to 36.
Spacing of steam-water pipes cooling table table 4-36
Pipe diameter
(mm) < phi
X 2.5 phi 45
X 2.5 phi 57
76 x 3.5 x 3.5 phi
89 x 3.5 phi phi 108 x 4
Phi phi 159 133 x 4
X 4.5 219
X 6 > 377
X 7
Biggest spacing between pipes and fittings
(m)
1.0
1.5
2.0
2.5
3
4
5
6.5
3.3 cooling system pipe, valves, instrument installation.
3.3.1 pipe installation:
3.3.1.1 refrigeration system pipe gradient and slope direction, such as the design without the specific provision shall meet the requirements of table 4-37.
Refrigeration system of the pipe slope wave to table 4 to 37
Pipeline that slope degree to the degree of slope
Oiler and the level of the exhaust pipe section of the condenser is connected to the condenser 3 ~ 5/1000
Condenser to the receiver of the horizontal section of the fluid pipe slope to the receiver 3 ~ 5/1000
Liquid distribution station to the evaporator/exhaust pipe for liquid level of pipe section 1 ~ 3/1000 slope to the evaporator
Evaporator/exhaust pipe to gas distribution station level of muffler section 1 ~ 3/1000 slope to the evaporator
Level of freon compressor suction pipe slope to the compressor
From the oil separator 4 ~ 5/1000
1 ~ 2/1000
The level of ammonia compressor suction pipe slope to low pressure barrels
The slope to the ammonia oil separator 3/1000 or higher
The level of the condensate pipe slope to the drainer 8/1000 or higher
3.3.1.2 refrigeration system of the liquid pipe installation should not have phenomenon of locally convex curved upward, so as to avoid formation of airbags. Gas pipe should not be partial concave downward bending phenomenon. In order to avoid formation of sac.
3.3.1.3 from the liquid main branch, from the bottom of the main or side out, from the gas main pipe, should meet the upper main or side.
3.3.1.4 pipes into tee connection, it should be on the refrigerant flow to turn into a branch pipe arc welding (figure 4 to 37 a) again, when the branch is the same as main diameter and pipe diameter is less than 50 mm, need to change a bigger size in main connection pipe diameter of the pipe section, and welding according to the above provisions (figure 4-37 b).
3.3.1.5 different pipe diameter of the pipe line, when welding the concentric reducer should be adopted (figure 4 to 37 c).
3.3.1.6 appropriate USES socket welding copper pipe connections, or pipe welding, flaring of socket depth should not be less than pipe diameter, flaring direction to the flow direction of medium should meet (figure 4-38).
3.3.1.7 copper tube incision surface should be level, can not have defects such as burrs, concave and convex. Incision plane tilted allow deviation for 1% of the pipe diameter.
3.3.1.8 copper tube heat bending available hot bending or cold bending, ellipticity should not be greater than 8%.
3.3.2 rainfall distribution on 10-12 valve installation:
3.3.2.1 valve installation position, direction and height shall not reverse loading should comply with the design requirements.
3.3.2.2 installation manual stop valve with handle, the handle must not down. Electromagnetic valve, regulating valve, thermal expansion valve and lift check valve, valve head shall be installed vertically upwards.
3.3.2.3 thermodynamic expansion valve thermal bag, should be put back into the trachea at the end of the evaporator, should be good contact, tie tightly, and insulation sealing dress, the same as the thermal insulation layer thickness.
3.3.2.4 relief valve before installation, should check the seal and the factory certificate, shall not be arbitrarily split rev.
3.3.2.5 set shutoff valve between the relief valve and the equipment if, in the work must be in the fully open position, and to the seal.
3.3.3 instrument installation:
3.3.3.1 all measuring instrument is using special products according to design requirements, pressure measuring instrument must use the standard gauge calibration, temperature measuring instrument must be used standard thermometer calibration and make records.
3.3.3.2 all instruments should be installed in the light is good, convenient for observation, not impede operation maintenance.
3.3.3.3 pressure relay and temperature relay shall be installed where is not affected by vibration.
3.4 system blowing, air tightness test and vacuum.
Blow the dirt 3.4.1 track systems:
3.4.1.1 the entire refrigeration system is a sealing surface and clean system, can not have any sundry exists, must use clean and dry air to blow dirty, the whole system will remain in the internal system of scrap iron, welding slag, mud and other debris blowing off.
3.4.1.2 before blowing dirt should choose set in the lowest point of the system directly. By 0.5 ~ 0.6 MPa pressure dry air purging; Such as the system is longer, can use a few segment drain outlet.
The work in order for many times repeatedly, when blown gas were examined with a white cloth without dirt for qualified.
3.4.2 system tightness test:
3.4.2.1 in sewage system after blasting, deal with the whole system (including equipment, valves) for air tightness test.
3.4.2.2 refrigerants for ammonia system, using the compressed air pressure test.
Refrigerants for freon system, adopting the bottled compressed nitrogen pressure testing. For larger refrigeration system of compressed air may be adopted, but must be made after drying treatment and then charged into the system.
3.4.2.3 leak detection methods: with soap and water for all joint system, valves, flange connection parts carefully daub leak detection, etc.
3.4.2.4 under the pressure test, the voltage 24 h after observing pressure value, not a pressure drop for qualified (except temperature).
3.4.2.5 pressure testing such as found in the process of leakage and maintenance must be carried out after pressure relief and shall not take repair.
Air tightness test pressure 3.4.2.6 system are shown in table 4-38.
System of air tightness test pressure MPa (KGF/cm2) table 4-38
refrigerant
The centrifugal chiller system pressure live plug refrigeration machine
R717 R22 R12 R11
Low pressure system
High pressure system 1.176 (12)
1.764 (18) 0.98 (10)
1.56 (16) 0.196 (2)
0.196 (2)
Note: 1. The brackets of KGF/cm2.
2. The low pressure system: refers to the throttle valve on the evaporator to the compressor suction test pressure; High pressure system: refers to the compressor outlet on the condenser to the throttle valve check test pressure.
1 scope
The technology standard is applicable to refrigeration system working pressure is lower than 2 mpa, temperature within 150 ~ ~ 20 ℃, transmission medium for refrigerant and oil pipe installation project.
2 construction preparation
2.1 material and main equipments
2.1.1 adopted by the pipe and the welding material should comply with the design rules, and have factory qualified certification qualification documents.
2.1.2 refrigeration system of all kinds of valve parts must use special products, and have the factory certificate.
2.1.3 seamless steel tube inside and outside surface should be no significant corrosion, no crack, double skin defects and concave and convex inequality.
2.1.4 brass inside and outside the wall should be bright and clean, and without hole, crack, scarring, spallation or defects such as gas pool.
2.1.5 construction machinery, hoist, air compressor, vacuum pump, hand wheel, grinding wheel cutting machine, pressure table, chain hoist, bench drill, hammer, groove machine, brass plate edge machine, hand saw, cover silk, plate, box spanner socket wrench, ring spanner, active board, spirit level, hammers, welding equipment, etc.
2.1.6 measuring tool: the steel ruler, steel tape, square, semiconductor thermometer, pressure gauge, etc.
2.2 operation conditions
2.2.1 complete design drawings, technical documents, refrigeration technology and construction procedures.
2.2.2 building structure engineering construction, interior decoration, complete basic and pipeline connection equipment installed to look for is finished, pipeline through the structural parts of the holes have been reserved, size is correct. Embedded parts set appropriate so as to meet the requirements of refrigeration pipeline construction.
2.2.3 construction preparation work is done, the material sent to the scene.
3 operation process
3.1 process:
Preview to construction preparation, pipeline installation and system such as blowing - system tightness test -
System vacuum - pipeline corrosion - refrigerant filling and inspection
3.2 the construction preparation
3.2.1, familiar with drawings and technical data about the quality of technological process, construction procedures and technical requirements.
3.2.2 according to construction drawing pipe position, you high, as is shown in steam-water measuring unreeling, find out the embedded iron.
3.2.3 valve of cooling system, before the installation, should according to the design requirements to undertake checking checking to types, specifications, and in accordance with the requirements stated in the specification cleaning and leak test.
3.2.4 refrigerants and lubricating oil system of pipes, pipe fittings should be rust and dirt clean inside and outside the wall, in addition to the rust of pipe nozzle should be closed, and keep inside and outside the wall is dry.
3.2.5 according to the regulations of the design, prefabrication cradle, insulation pipe, support the applied by contact with the pipe anticorrosion treated soil cushion and heat insulation. Wood cushion thickness should be the same as the insulation layer thickness. Type of steam-water spacing are shown in table 4 to 36.
Spacing of steam-water pipes cooling table table 4-36
Pipe diameter
(mm) < phi
X 2.5 phi 45
X 2.5 phi 57
76 x 3.5 x 3.5 phi
89 x 3.5 phi phi 108 x 4
Phi phi 159 133 x 4
X 4.5 219
X 6 > 377
X 7
Biggest spacing between pipes and fittings
(m)
1.0
1.5
2.0
2.5
3
4
5
6.5
3.3 cooling system pipe, valves, instrument installation.
3.3.1 pipe installation:
3.3.1.1 refrigeration system pipe gradient and slope direction, such as the design without the specific provision shall meet the requirements of table 4-37.
Refrigeration system of the pipe slope wave to table 4 to 37
Pipeline that slope degree to the degree of slope
Oiler and the level of the exhaust pipe section of the condenser is connected to the condenser 3 ~ 5/1000
Condenser to the receiver of the horizontal section of the fluid pipe slope to the receiver 3 ~ 5/1000
Liquid distribution station to the evaporator/exhaust pipe for liquid level of pipe section 1 ~ 3/1000 slope to the evaporator
Evaporator/exhaust pipe to gas distribution station level of muffler section 1 ~ 3/1000 slope to the evaporator
Level of freon compressor suction pipe slope to the compressor
From the oil separator 4 ~ 5/1000
1 ~ 2/1000
The level of ammonia compressor suction pipe slope to low pressure barrels
The slope to the ammonia oil separator 3/1000 or higher
The level of the condensate pipe slope to the drainer 8/1000 or higher
3.3.1.2 refrigeration system of the liquid pipe installation should not have phenomenon of locally convex curved upward, so as to avoid formation of airbags. Gas pipe should not be partial concave downward bending phenomenon. In order to avoid formation of sac.
3.3.1.3 from the liquid main branch, from the bottom of the main or side out, from the gas main pipe, should meet the upper main or side.
3.3.1.4 pipes into tee connection, it should be on the refrigerant flow to turn into a branch pipe arc welding (figure 4 to 37 a) again, when the branch is the same as main diameter and pipe diameter is less than 50 mm, need to change a bigger size in main connection pipe diameter of the pipe section, and welding according to the above provisions (figure 4-37 b).
3.3.1.5 different pipe diameter of the pipe line, when welding the concentric reducer should be adopted (figure 4 to 37 c).
3.3.1.6 appropriate USES socket welding copper pipe connections, or pipe welding, flaring of socket depth should not be less than pipe diameter, flaring direction to the flow direction of medium should meet (figure 4-38).
3.3.1.7 copper tube incision surface should be level, can not have defects such as burrs, concave and convex. Incision plane tilted allow deviation for 1% of the pipe diameter.
3.3.1.8 copper tube heat bending available hot bending or cold bending, ellipticity should not be greater than 8%.
3.3.2 rainfall distribution on 10-12 valve installation:
3.3.2.1 valve installation position, direction and height shall not reverse loading should comply with the design requirements.
3.3.2.2 installation manual stop valve with handle, the handle must not down. Electromagnetic valve, regulating valve, thermal expansion valve and lift check valve, valve head shall be installed vertically upwards.
3.3.2.3 thermodynamic expansion valve thermal bag, should be put back into the trachea at the end of the evaporator, should be good contact, tie tightly, and insulation sealing dress, the same as the thermal insulation layer thickness.
3.3.2.4 relief valve before installation, should check the seal and the factory certificate, shall not be arbitrarily split rev.
3.3.2.5 set shutoff valve between the relief valve and the equipment if, in the work must be in the fully open position, and to the seal.
3.3.3 instrument installation:
3.3.3.1 all measuring instrument is using special products according to design requirements, pressure measuring instrument must use the standard gauge calibration, temperature measuring instrument must be used standard thermometer calibration and make records.
3.3.3.2 all instruments should be installed in the light is good, convenient for observation, not impede operation maintenance.
3.3.3.3 pressure relay and temperature relay shall be installed where is not affected by vibration.
3.4 system blowing, air tightness test and vacuum.
Blow the dirt 3.4.1 track systems:
3.4.1.1 the entire refrigeration system is a sealing surface and clean system, can not have any sundry exists, must use clean and dry air to blow dirty, the whole system will remain in the internal system of scrap iron, welding slag, mud and other debris blowing off.
3.4.1.2 before blowing dirt should choose set in the lowest point of the system directly. By 0.5 ~ 0.6 MPa pressure dry air purging; Such as the system is longer, can use a few segment drain outlet.
The work in order for many times repeatedly, when blown gas were examined with a white cloth without dirt for qualified.
3.4.2 system tightness test:
3.4.2.1 in sewage system after blasting, deal with the whole system (including equipment, valves) for air tightness test.
3.4.2.2 refrigerants for ammonia system, using the compressed air pressure test.
Refrigerants for freon system, adopting the bottled compressed nitrogen pressure testing. For larger refrigeration system of compressed air may be adopted, but must be made after drying treatment and then charged into the system.
3.4.2.3 leak detection methods: with soap and water for all joint system, valves, flange connection parts carefully daub leak detection, etc.
3.4.2.4 under the pressure test, the voltage 24 h after observing pressure value, not a pressure drop for qualified (except temperature).
3.4.2.5 pressure testing such as found in the process of leakage and maintenance must be carried out after pressure relief and shall not take repair.
Air tightness test pressure 3.4.2.6 system are shown in table 4-38.
System of air tightness test pressure MPa (KGF/cm2) table 4-38
refrigerant
The centrifugal chiller system pressure live plug refrigeration machine
R717 R22 R12 R11
Low pressure system
High pressure system 1.176 (12)
1.764 (18) 0.98 (10)
1.56 (16) 0.196 (2)
0.196 (2)
Note: 1. The brackets of KGF/cm2.
2. The low pressure system: refers to the throttle valve on the evaporator to the compressor suction test pressure; High pressure system: refers to the compressor outlet on the condenser to the throttle valve check test pressure.
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