3.
2.
1.8 during the air tightness test, the pressure shall be slowly boosted to the test pressure at a boosting rate of no more than 0.5mpa/s, and the pressure drop within 3min after turning off the test air source shall not exceed 10% of the test pressure.
It also has the hydraulic strength test When compared with the air pressure strength test conditions, you can select any method for the test.
When flange welding connection is required with individual connection parts such as selector valve, the anti-corrosion coating damaged by welding shall be subject to secondary anti-corrosion treatment.
Inspection method: according to section E.1 of this specification.
The value of pneumatic strength test pressure: 80% of the hydraulic strength test pressure for carbon dioxide fire extinguishing system, 10.5mpa for IG541 mixed gas fire extinguishing system, and 1.15 times the maximum working pressure for halogenated alkane 130L fire extinguishing system and heptafluoropropane fire extinguishing system, so 4.2 × 1.15 = 4.83mpa.
When tightening the thread, the filler shall not be squeezed into the pipe; There shall be 2 ~ 3 exposed threads at the thread root after installation; After connection, clean the outside of the connection and conduct anti-corrosion treatment.
E.
5.5.3 The installation of pipe supports and hangers shall comply with the following provisions: 1.
E.
The storage capacity of fire extinguishing agent in the protection area of a heptafluoropropane gas fire extinguishing system is 2.5MPa at 20 ℃ and 4.2mpa at 50 ℃.
D.
When threaded connection is adopted, the pipe shall be mechanically cut; The thread shall be free of missing lines, broken lines and other phenomena; The sealing material for threaded connection shall be evenly attached to the threaded part of the pipe.
the pressurized medium for the air pressure strength test or air tightness test can be air, carbon dioxide or nitrogen.
The pipeline that passes the pneumatic strength test and has not been disassembled after the test may not be subject to the air tightness test.
For the main pipeline with nominal diameter greater than or equal to 50mm, at least one anti sway support shall be installed in the vertical and horizontal directions.
5.5.5 The outer surface of the fire extinguishing agent transmission pipeline should be painted with red paint.
6.3 answer click the blank space below to get answer C [analysis] When the hydraulic strength test conditions are not available, pneumatic strength test can be used instead.
1.3 when the conditions for hydraulic strength test are not available, pneumatic strength test can be used instead.
C.
Inspection quantity: full inspection.
2.
The nominal diameter of the casing shall be at least 2 levels larger than the nominal diameter of the pipeline, the length of the casing through the wall shall be equal to the wall thickness, and the length of the casing through the floor shall be 50mm higher than the floor.
Inspection method: observation and measurement with ruler.
Inspection quantity: full inspection.
Inspection quantity: complete appearance inspection and spot check at concealed places.
1.4 the pneumatic strength test shall comply with the following provisions: before the test, the pre-test must be carried out with pressurized medium, and the pre-test pressure should be 0.2MPa.
When passing through the building floor, one anti sway support shall be set on each floor.
3.
Inspection method: observation inspection.
Inspection method: observation and measurement with ruler.
The diameter and length of the bolt connecting the flange shall meet the standard.
The color ring width of each protection area or protected object shall be consistent and the spacing shall be uniform.
1.1 the hydraulic strength test pressure shall be taken according to the following provisions: 1 for high-pressure carbon dioxide fire extinguishing system, 15.0mpa shall be taken; For low-pressure carbon dioxide fire extinguishing system, 4.0Mpa shall be taken.
5.5.1 The connection of fire extinguishing agent transmission pipeline shall comply with the following provisions: 1.
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After tightening, the length of the protruding nut shall not be greater than 1 / 2 of the screw diameter, and there shall be no less than 2 exposed threads.
B.
When flange connection is adopted, the gasket shall not protrude into the pipe, its outer edge shall be close to the bolt, and double or partial gaskets shall not be placed.
E.
5.5.2 Sleeves shall be installed where pipes pass through walls and floors.
The pressure value of air pressure strength test: 80% of the water pressure strength test pressure is taken for carbon dioxide fire extinguishing system, 10.5mpa for IG541 mixed gas fire extinguishing system, and 1.15 times the maximum working pressure is taken for halothane 1301 fire extinguishing system and heptafluoropropane fire extinguishing system.
E.
The pipeline that has passed the gas strength test and has not been disassembled after the test may not be subject to the air tightness test.
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The pipe end shall be fixed with anti sway support, and the distance between the support and the end nozzle shall not be greater than 500mm.
Click the blank below to obtain the answer a [analysis] The fire extinguishing agent delivery pipeline shall also be subject to the air tightness test after passing the hydraulic strength test.
Inspection quantity: full inspection.
5.5.4 After the installation of the fire extinguishing agent transmission pipeline, the strength test and air pressure tightness test shall be carried out and qualified.
During the test, gradually and slowly increase the pressure.
The pipes shall be firmly fixed, and the maximum spacing of pipe supports and hangers shall comply with the provisions of table 5.5.3.
It is qualified if there is no deformation and leakage at all parts of the pipeline during pressure maintaining inspection.
1.7 the air tightness test pressure shall be 2 / 3 of the hydraulic strength test pressure.
When the pressure rises to 50% of the test pressure, if no abnormality or leakage is found, continue to step up the pressure according to 10% of the test pressure, and stabilize the pressure for 3min at each stage until the test pressure.
E.
The following statements about the strength test and air tightness test of the extinguishing agent transmission pipeline of the gas fire extinguishing system are correct（ ）。 A.
Inspection quantity: full inspection.
1.2 during the hydraulic strength test, slowly increase the pressure to the test pressure at a pressure increase rate of no more than 0.5mpa/s, maintain the pressure for 5min, and check that there is no leakage and deformation in all parts of the pipeline.
The seamless steel pipe with anti-corrosion treatment shall not be connected by welding.
When the pneumatic strength test is used to replace the hydraulic strength test for the fire extinguishing agent transmission pipeline in the protection area, the minimum test pressure shall be（ ） MPa。A.3.75B.4.62 C.4.83 D.
3 for halothane 1301 fire extinguishing system and heptafluoropropane fire extinguishing system, 1.5 times the maximum working pressure of the system shall be taken.
2 for IG541 mixed gas fire extinguishing system, 13.0mpa shall be taken.
Inspection method: observation inspection.
When the pipeline crosses the deformation joint of the building, a flexible pipe section shall be set.
E.
1.5 after passing the hydraulic strength test, the fire extinguishing agent transmission pipeline shall also be subject to the air tightness test.
The pipeline that passes the air pressure test and has not been disassembled after the test may not be subject to the air tightness test.
Pipes in concealed places such as suspended ceiling and under raised floor can be painted with red paint color ring, and the width of the color ring shall not be less than 50mm.
the air tightness test pressure of IG541 mixed gas fire extinguishing agent transmission pipeline is almost the same as that of the air pressure strength test, so only the air tightness test can be conducted.
2.
The gap between the pipe and the casing shall be filled tightly with fireproof sealing materials.
E.
When the direction of horizontal pipeline changes, anti sway support shall be added.
