【 Weak current College 】 fire system pressure test and flushing

System pressure test including strength and tightness test, the wet extinguishing system available water testing; dry fire suppression system, dry and wet fire suppression systems, fire extinguishing system preaction; both for the water pressure test to test for air pressure.

4.6.1 system pressure test before doing the following preparations

1 pipe branch, cradles, after check all meet the design requirements and relevant norms.

2 the buried pipeline coordinates, elevation, slope and pipeline infrastructure, buttress, review meet the design requirements.

3 pressure gauge has been validated with, the precision is not lower than class 1.5, pressure gauge range to test values 1.5 times ~ 2 times.

4 pressure test before cannot participate in the pressure test equipment, instruments, valves and accessories should be quarantined or removed additional blind Board highlights the edges of the flange and ear, a clearly marked.

4.6.2 hydraulic test method

1 hydrostatic pressure test to use do not contain oil and acid-base and other impurities of clean water as a medium, its strength test program by filling water booster, strength check several steps to complete.

1) hydraulic test of sufficient water points in the system or generally chosen segment of the lower Office, WOB optional hand pumps and electric pump or electric centrifugal pumps, water filling valve system before all the open, at the same time open the high point drop valve, close the bottom drain valves, connected fles, pressure gauges and pressure pump to supply sufficient water, and air in the system, the total net drained off into the valve and inlet valves, a comprehensive inspection pipe system with and without leakage phenomenon, such as a leaking timely repairs.

2) step-up and strength test: after the pipeline is full of water should be no leakage phenomenon, then through the pressure booster slowly, when the pressure gauge pointer start action, should stop pressurizing, conduct a comprehensive inspection of the system and found that the disclosure in a timely manner, when the boost to a certain value, you should stop on the pipeline inspection, no question, and then continue the compression, usually divided into 2-3 times to test pressure, stop step-up quickly close observation of inlet valves, pressure gauges, such as pressure gauge pointer description of swing, should exhaust, once again open the valve and exhaust, to test pressure, and record the time stop pressure checks, regulators, network 30min leak and no deformation and pressure drop is not greater than O.05MPa, strength test.

2 hydraulic test for tightness tests shall be carried out after the system flushing qualified, the test pressure is the pressure of work, voltage 24h, no leakage is qualified.

3 hydraulic test requirements

1) hydraulic test environment temperature should be no lower than 5 ° c, when less than 5 ° c, to pneumatic hydraulic pressure test, frozen in place of the season, should still be compensated for the hydrostatic test, must be in the water pressure test systems, the measures to be taken to prevent frostbite, and 50 ℃ hot water for testing or in water mixed with people 20%-30% of salt for the winter cold salt water test, conducted by hydrostatic pressure test to prepare adequate, prompt, timely discharge after the end of the experiment, the net system of water, the winter cold salt water test, applied water clean.

2) hydraulic test pressure of, when the system design pressure is less than or equal to the water pressure strength 1.OMPa test pressure for design work pressure of 1.5 times, and not less than 1.4MPa, when the system design work pressure greater than 1.OMPa, hydrostatic test pressure than the working pressure high 0.4MPa.

3) sprinkler system water dry pipe, gas pipe and indoor buried pipeline before the backfill and hydrostatic test systems.

4) hydraulic test is finished, the strength and tightness test results fill pressure test record sheet.

4 test steps

1) flow indicator, signal valve, horizontal branch pipe installation has been completed, for horizontal branch pipe pressure test.

2) flow indicator, signal valve, pipe installation under cited, for cited pipe pressure test.

3) pumps the signal before valve-valve head road after installation is complete, the sprinkler system piping (without shower) pressure test.

4) question to shower after installation is complete, a spray system pressure test.

5) question 2), 4) after installation is complete, the system pressure test, the voltage 24h, relevant departments for testing records.

6) Fire Department acceptance, check before system water regulator.

7) acceptance in the before the completion of the entire system opened water injection and regulators.

4.6.3 pressure test method and requirements

When the pipeline system by the specification or for special reasons adopts pneumatic test, free compressed air or nitrogen and other inert gases as medium to experiment.

1 pressure strength test, the pressure should be gradually increased, first to test pressure of 50 per cent to check if the leak and anomalies, and then press the test pressure of 10 per cent to step-up and check, so gradual boost and check up strength of pressure regulators 3min per level, achieve the test pressure is constant lOmin, check pipes and piping attachment without leakage, and have not found the failure phenomenon, the strength test, leakage test was conducted after the strength test, the pressure is reduced to a tightness test 0.28MPa, voltage, pressure not exceeding 24h O.01MPa, is qualified.

2 pressure test requirements

1) pipeline pressure tests for protective measures before the pipe inlet air time and pipe in the test pressure of constant pressure of time, no person shall remain in the protection zone, and is strictly prohibited in the pipeline pressure during the beating, repair and tighten the bolts, etc.

2) pressure strength test pressure regulators for 1.OOMPa, lOmin, no leakage, no deformation, and the pressure of not more than, a qualified 0.005MPa, air tightness test pressure regulators for 0.28MPa 24h, pressure drop, no more than 0.01MPa, which is qualified, and fill out the pressure test records. ，

4.6.4 system of water washing method and requirements

1 pipe flushing should pressure test strength after passing the order section, washing room, after the first outdoor first floor underground, after some indoor flushing should be equipped with water pipes, water pipes, branch pipes of order processing.

2 pipeline flush before doing the washing water emission, discharge pipe sections should not be less than be flushing pipe cross-section of 60 per cent.

3 wash washing water pipe network, shall not be used with seawater or containing corrosive chemical solution to rinse.

4 washing before the system instrument take protective measures, and alarm valve, check valve should be removed, rinse the end should be reset.

5 on cannot wash washing equipment and bevelled, odds and ends after the segment that should get special treatment.

6 rinse before the pipe hangers, hangers are checked and, if necessary, strengthening of measures to be taken.

7 washing pipe diameter greater than lOOmm, should weld, corners and bottom knock, but shall not damage the pipe.

8 pipeline flush of unfit water flow rate is less than 3m/s flow should not be less than the table

4.6.4, when construction site rinsing flow does not meet the requirements, you should press system design flow for washing or rinsing with water pressure pneumatic method.

4.6.4 pipeline flush flow

Pipe diameter (mm) 30025020015012510080655040
Flow rate (L/S) 22015498583825151064

9 distribution of ground pipelines and underground pipe connections, you should add at the bottom of the tube, on plug for flushing underground pipeline.

10 water washing should be continuous to the export of water color, transparency and population Department, basically the same as qualified.

11 water rinse water should be conducted and fire sprinkler system in the direction of flow.

12 after the pipe flush water discharge, always there when needed to dry compressed air or take other protection measures.

13 after the pipe flush to complete system flush records table.

Note: automatic sprinkler system installation in addition to complying with the provisions of this regulation, shall be consistent with the existing buildings and sewerage and heating engineering construction quality approval standard "CB50242-2002 and now plug in devices, industrial pipeline welding engineering construction and acceptance of GB50236-98.