GB 19572-2013Low pressure carbon dioxide extinguishing system and components (English PDF)

6.1 System

6.1.1 System Components The system shall consist of at least the storage device, the total control valves, drives, nozzles, pressure relief devices, signal feedback devices, controllers and other components constitute.

6.1.2 Operating Temperature Range The system should be able to work properly in a temperature range of -23 °C ~ 50 °C.

6.1.3 Appearance

6.1.3.1 System components for corrosion protection, anti-corrosion coating should be uniform, beautiful, complete, there should be no holes, ash, scars, bumps, etc. defect.

6.1.3.2 should set the nameplate in the apparent site systems, content nameplate sign shall comply with the requirements of 9.1.1.

6.1.3.3 outer surface of the extinguishing agent storage container prominent place should be marked with the fire extinguishing agent name, writing should be clear, clearly visible.

6.1.3.4 should be a permanent mark on each of the selector valve, marking content to meet the requirements of 9.1.2.

6.1.3.5 member mounting arrangement should be reasonable, should not affect the maintenance, inspection and use operations.

6.1.4 Sealing Performance After all system components installed, the method specified in

7.3.4 shall be tightness tested at 2.2MPa pressure, there should be no Leaks, standing 24h, there should be no pressure drop.

6.1.5 extinguishing agent storage container volume requirements Carbon dioxide fire extinguishing agent storage container volume should not exceed 20m3.

6.1.6 extinguishing agent requirements Carbon dioxide extinguishing agent shall comply with the requirements of GB 4396.

6.1.7 extinguishing agent loading capacity factor requirements Carbon dioxide fire extinguishing agent storage containers PACKING coefficient should not exceed 0.95.

6.1.8 Leak alarm requirements The system should have a fire-extinguishing agent leak detection function, when the loss of carbon dioxide fire extinguishing agent storage container filled reaches its initial filling volume When 10% shall be audible and visual alarm signal.

6.1.9 Pressure display requirements The system should be equipped with fire extinguishing agent storage device capable of displaying the internal pressure gauge.

6.1.10 overpressure relief requirements

6.1.10.1 storage device should be installed at least two safety valves, valve selection and settings should meet the requirements of GB 150.

6.2 storage device

6.2.4 Pressure Relief Device

6.2.4.1 General requirements It should be used on the fire extinguishing agent storage container as a safety valve pressure relief devices.

6.2.4.2 safety valve 6.2.4.2.1 nominal working pressure Safety valve nominal working pressure of not less than 2.5MPa. 6.2.4.2.2 Setting pressure According to the method specified in

7.5.1 tested safety valve setting pressure 2.38MPa, deviation ± 0.12MPa. 6.2.4.2.3 back seat pressure

7.5.1 according to the method specified in the test, the back seat pressure relief valve shall not be less than 2.15MPa. 6.2.4.2.4 strength requirements

7.2 according to the method specified in the test, the test pressure of

1.5 times the nominal working pressure, holding pressure 5min, the valve should not be deformation and leakage phenomenon. 6.2.4.2.5 sealing requirements

7.3.2 according to the method specified in the test, the test pressure of

0.9 times the setting pressure, holding pressure 5min, the valve outlet should be no bubble leakage. 6.2.4.2.6 reliability requirements Safety valve at 20 °C ± 5 °C temperature of 100 action test, the test pressure for the safety valve opening pressure when moving the valve test As should be flexible, accurate and reliable, there should not be any failure and structural damage after the test was completed, the air tightness test pressure testing and tuning, The results shall meet the requirements of 6.2.4.2.5 and 6.2.4.2.2. 6.2.4.2.7 salt spray corrosion resistance

7.7 according to the method specified in the test, all parts of the safety valve should not have a significant corrosion damage. After the test, then the air-tightness test Set pressure test and inspection results should meet the requirements of 6.2.4.2.5 and 6.2.4.2.2. 6.2.4.2.8 flag Safety valve markings shall comply with the requirements of 9.1.2.

6.2.4.3 Safety relief diaphragm 6.2.4.3.1 Pressure relief action Diaphragm safety relief relief action should be designed to determine the pressure setting, venting operating pressure range of the set value × (1 ± 5%). 6.2.4.3.2 salt spray corrosion resistance

7.7 according to the method prescribed test, pressure test carried out relief operation after completion of the test results shall meet the requirements of 6.2.4.3.1.

6.2.5 Pressure control display unit

6.2.5.1 Pressure Switch 6.2.5.1.1 nominal working pressure Pressure switch nominal working pressure of not less than 2.5MPa. 6.2.5.1.2 pressure for action CS pressure switch action shall respectively 2.10MPa ± 0.05MPa and 1.95MPa ± 0.05MPa. AS switch operating pressure should respectively 2.20MPa ± 0.05MPa and 1.80MPa ± 0.05MPa. 6.2.5.1.3 strength requirements

7.2 according to the method prescribed hydraulic strength test, the test pressure of

1.5 times the nominal working pressure, holding pressure 5min, the pressure switch should not be Leakage, deformation and rupture damage. 6.2.5.1.4 sealing requirements

7.3.3 according to the method prescribed air tightness test, the test pressure of

1.1 times the nominal working pressure, holding pressure 5min, connecting seal portion There should be no air bubbles leak position. 6.2.5.1.5 reliability requirements At a temperature of 20 °C ± 5 °C, CS 5000 switch operation should be carried out tests, AS switch shall be 100 actuations test, the test pressure Force pressure switch operating pressure during the test pressure switch normally open (normally closed) contacts should be reliably closed (off), and there should be no Failures and structural damage. After the test, and then air tightness test and operating pressure test, and the results should be consistent with 6.2.5.1.4 6.2.5.1.2 requirements. 6.2.5.1.6 operating reliability at extreme temperatures Pressure switch at a temperature of -23 °C and 50 °C for 10 times each action test, the test pressure for the pressure switch operating pressure, test During the pressure switch normally open (normally closed) contacts should be reliably closed (off), there should be no pressure switch failures and structural damage, pressure switch Off the operating pressure should meet the requirements of 6.2.5.1.2. 6.2.5.1.7 salt spray corrosion resistance

7.7 according to the method prescribed salt spray corrosion test, all parts of the pressure switch should not have a significant corrosion damage. After the test, and then into Line tightness test and reliability test at room temperature, and the results should be consistent with the requirements of 6.2.5.1.4 and 6.2.5.1.5. 6.2.5.1.8 withstand voltage performance Under normal atmospheric conditions, all contacts of the pressure switch (except ground) and between the shell should be able to withstand lasted 60s, frequency of 50Hz AC voltage test during the test, there should not be surface flashover, sweep discharge, corona or breakdown. The test voltage specified in Table 1 get on. Ta...