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Shipbuilding Industry Standard of the People's Republic of China
CB/T3557—1995
Marine Fire Damper
Published on 1995-06-19
Published by China State Shipbuilding Corporation
Implemented on 1996-04-01
Shipbuilding Industry Standard of the People's Republic of China
Marine Fire Damper
1 Subject Content and Scope of Application
CB/T3557-1995
Classification Number: U54
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of marine fire dampers. This standard applies to fire dampers for ventilation and air-conditioning systems of ships and drilling platforms, as well as fire dampers for ventilation and air-conditioning systems of various buildings and key departments on land. 2 Reference standards
GB1561-79 Marine welded ventilation flange
Technical conditions for marine ventilation accessories
GB3029-82
GB3181—82
Standard sample of paint film color
GB/T13306—91
GJB150.11—86
GJB150.1686
Environmental test methods for military equipment Salt spray test Environmental test methods for military equipment Vibration test Environmental test methods for military equipment Impact test GJB150.18---86
3 Language
3.1 Fire damper
A damper that is placed in the ventilation duct and automatically closes after sensing the high temperature gas temperature from the fire alarm area. 3.2 Left-type fire damper
A fire damper with the control box on the left, facing the air outlet, and based on the side where the temperature sensing element is located. 3.3 Right-type fire damper
A fire damper with the control box on the right, facing the air outlet, and based on the side where the temperature sensing element is located. 3.4 Fire damper adjustment
A fire damper that can be adjusted in steps within the range of 0° to 90° within the valve plate opening angle. 4 Product classification
4.1 Type
4.1.1 According to the air volume adjustment function, it is divided into two types: non-adjustable and adjustable. 4.1.2 According to the shape of the air duct, it is divided into two types: circular and rectangular. 4.1.3 According to the installation position on the equipment and pipeline, it is divided into two types: left-type and right-type. 4.2 Structure and basic dimensions
4.2.1 The structure and basic dimensions of the circular fire damper are as shown in Figure 1 and Table 1. China State Shipbuilding Corporation issued on June 19, 1995 and implemented on April 1, 1996
Nominal diameter
CB/T3557-1995
1--Handle; 2-Control box; 3-Valve plate: 4-Thermal sensing piece: 5-Shell; 6-Manual cable; 7-Stuffing box
Flange inner hole diameter
Screw hole center circle diameter
Flange outer diameter
Number of bolt holes n
Flange thickness
CB/T3557-1995
4.2.2 The structure and basic dimensions of rectangular fire dampers are as shown in Figure 2 and Table 2. Figure 2
1 handle; 2--control box; 3 valve plate; 4-temperature sensor; 5-body; 6-manual cable; 7-stuffing box nominal
rectangular channel
nominal size
flange inner edge size
CB/T3557--1995
flange outer edge size
screw hole row spacing
screw hole spacing
number of bolt holes n
4.3 Product marking
4.3.1 Composition of marking:
4.3.2 Marking example
CB/T3557-1995
Installation position
Duct size.
Adjustment function
Marine fire damper
Rectangular, left-type, adjustable marine fire damper with a width of 80mm and a height of 250mm: Marine fire damper CFV80×250LCB/T3557--1995Round, right-type, non-adjustable marine fire damper with a nominal diameter of 450mm: Marine fire damper CF450RCB/T3557-19955Technical requirements
5.1 Marine conditions
The fire damper should be able to work normally under the following conditions: L-left type
R-right type
Rectangular: width x height
Circular: nominal diameter
V-adjustable
Non-adjustable, no standard
a. Tilt and swing: heel ±15°, pitch ±10°, roll ±45° (cycle 3-14s), pitch ±10° (cycle 4-10s). The above values are for military products, and the civilian products are half of the above values; b. Vibration: vibration frequency is 1~60Hz, displacement is 1.0mm, acceleration is 10m/s; c. Impact: forward: 37°, 66°, 90°, vertical: 0.3m, 0.9m, 1.5m, lateral 37°, 66°, 90°, impact once each, a total of nine impacts in three directions;
d. Salt spray: the fire damper should be able to close flexibly after being sprayed with a salt solution containing 5%±1% sodium chloride by weight for 120 hours; e.
The ambient temperature is -10~+45℃, and the relative humidity is not more than 95%. 5.2 Appearance
After the fire damper is assembled, the surface paint layer should be firm, neat, without scratches and peeling, and the surface should be smooth and flat. 5.3 Performance
5.3.1 The electrical performance shall meet the following requirements:
Insulation resistance: Under normal environmental conditions, the insulation resistance between the external live terminal and the housing, and between the power plug and the housing shall be greater than 20.Ma;
b. Withstand voltage performance: When an alternating current with a frequency of 50Hz and a pressure of 500V is applied to the fire damper, the test piece shall not experience surface arcing, sweeping discharge, corona and breakdown;
c. Sealing of the control box: After continuous showering for 30 minutes, the insulation performance and withstand voltage performance of the fire damper shall still meet the requirements of a and b of this article.
5.3.2 The fire resistance limit of the fire damper is 3h. 5.3.3 After the fire damper is closed, when the pressure difference on both sides of the valve plate is 19.6Pa, under standard conditions (air temperature is 20℃, air pressure is 101.3kPa), the air leakage should not exceed 5m/(m2min). 5
CB/T3557-1995
5.3.4 When the air velocity through the fire damper is 1m/s and the air temperature before the fuse is 90±5℃, the timing starts from 85℃, the fuse should melt within 1min, and the actuator should operate to automatically close the valve plate. 5.3.5 When the air velocity through the fire damper is 1m/s and the air temperature is controlled at 50±3℃, the timing starts from 47℃, and the fuse should not melt within 5min
5.3.6 The melting point temperature of the fusible piece of the fire damper should be within 70±3C. 5.3.7 For non-adjustable fire dampers, the valve plate opening angle should be 90°. 5.3.8 For adjustable fire dampers, the valve plate opening angle should be divided into 6 levels within the range of 0° to 90°, with each level being 15°. 5.3.9 When operating the manual pull rope or handle for manual closing, the valve plate should be able to quickly reach the closed state from the open state conveniently, sensitively and reliably, and the handle should be reset normally and flexibly. There should be obvious handle opening and closing signs at appropriate locations. 5.3.10 For fire dampers with electric closing function, when the valve plate is placed at various opening angles, a DC24±2.4V voltage is applied, the valve plate should be able to close automatically and quickly, the handle should be reset normally, the action should be flexible and reliable, and the closing current should not be greater than 0.7A. Fire dampers with electrical signal interlocking devices should send accurate and reliable electrical signals when the valve plate is closed. 5.3.11 The fire damper is closed from the fully open position by a manual or electric closing device to close the valve plate. After the number of consecutive closings reaches 250 times, the components of the fire damper should not have obvious deformation, displacement or disconnection. 5.4 Materials
Material of the main parts of the fire damper shall be in accordance with Table 3. Table 3
Part Name
Temperature Sensing Plate
Large Torsion Spring
5.5 Manufacturing
Material Name
Cold Rolled Steel Plate
High Quality Elastic Poor Steel
Material Brand
Q235-A
60Si2MnA
5.5.1 The surface of the weld should be smooth and flat, without defects such as cracks, pores, slag inclusions, etc. Standard No.
GB70088
GB5231—85
GB5218—85
5.5.2 The inner surface of the temperature sensing piece shall be cast with a fusible metal with a melting temperature of 70±3℃, and the distance between the temperature sensing pieces shall be 0.10.2mm. 5.5.3 The paint film color of the outer surface of the fire damper shall be the red color specified in GB3181. 5.5.4 The flange of the fire damper shall comply with the provisions of GB1561, and other technical conditions shall comply with the requirements of GB3029. 6 Test methods
6.1 Marine condition test
6.1.1 Tilt and swing test
Fix the tested fire damper on the swing table, and the valve plate is in the open state. Tilt ±15°, pitch ±10°, roll ±45° (cycle 3~14s), pitch ±10°, cycle 410s). The above are military values, and civilian products are half of the above values. The test time for each of the above items is 30 minutes. After the test, the movement of each motion mechanism should be normal, and the manual and electric closing should be flexible and reliable. 6.1.2 Vibration test
Fix the test product directly on the vibration table according to the use state, and conduct sinusoidal vibration tests in three directions in the open state of the valve plate, with a rated frequency of 1.0~60Hz, a displacement of 1.0mm, and an acceleration of 10m/s. In the selected test frequency range, perform 10 sweep cycles at a rate of 1 octave/min.
At the dangerous frequency, if there is no dangerous frequency, then at the upper limit frequency, each axial test for 2h. After the above test, each motion mechanism should operate normally, and manual and electric closing should be flexible and reliable. 6.1.3 Impact test
CB/T3557—1995
Fix the test piece on the C-200 impact machine according to the use status, with the valve plate in the open state, forward: 37°, 66°, 90°, vertical: 0.3m0.9m, 1.5m, lateral: 37°, 66°, 90°, each impact time. After the test, each motion mechanism should operate normally, and manual and electric closing should be flexible and reliable.
6.1.4 Salt spray test
According to the test conditions specified in GJB150.11, the test piece is placed in a salt spray test box in the open state, with a salt solution containing 5% ± 1% sodium chloride by weight, a pH value of 6%, a sedimentation rate of 1-2mL/(h·80cm2), and a test temperature of 34.5-35.5℃. Spray continuously for 120h (i.e. 5 cycles), then take out the test piece, rinse off the sodium chloride deposited on the test piece with clean water, and place it at room temperature for 24h. After the test, the movement of each movement mechanism should be normal, and the manual and electric closing should be flexible and reliable. 6.2 Appearance inspection
The welding surface and paint quality should be inspected by visual method and should meet the requirements of Article 5.2. 6.3 Performance test
6.3.1 Insulation resistance test
Under normal environmental conditions, use an megohmmeter to measure the insulation resistance between the external live terminals of the test piece and the housing, and between the power plug and the housing. The value should be greater than 20Ma.
6.3.2 Voltage withstand performance test
When the rated working voltage of the fire damper does not exceed 50V, apply an AC test voltage with a frequency of 50Hz, and increase the voltage from 0 to 500V at a rate of 100 to 500V/s, and maintain it for 60±5s. The test piece should not have surface arcing, sweeping discharge, corona and breakdown. 6.3.3 Control box sealing test
After the test piece is continuously flushed with water flow aimed at its actuator for 30 minutes, the electrical performance and voltage withstand performance of the fire damper should still meet the requirements of Articles 6.3.1 and 6.3.2.
6.4 Fire resistance limit test
6.4.1 Test procedure
The fire resistance limit test shall be carried out continuously until the limit time of 3h is reached or until the judgment conditions specified in Article 6.4.3 are considered to be unqualified.
6.4.2 Water spray test
Within 1 minute after the end of the fire resistance limit test, the fire-exposed surface of the test piece shall be sprayed with a water hose, first spraying the middle of the test piece and then spraying the remaining surfaces. The pressure of the sprayed water is 310kPa, and the continuous spraying time per square meter is 32s. 6.4.3 Judgment conditions
6.4.3.1 Within 60s after the start of the fire resistance limit test or before the furnace temperature reaches 141℃, the temperature fuse of the fire damper equipped with a fuse with a melting point of 70±3℃ shall be activated and the valve plate shall be automatically closed. 6.4.3.2 During the fire resistance limit test and after water spraying, the fire damper shall not have visible penetration gaps that did not exist before the test. When observed perpendicular to the damper installation plane, the original visible penetration gap of the damper shall not increase. 6.4.3.3 During the 3h fire resistance limit test, the gap between any two parts of the tested damper shall not increase by more than 3.2mm, and after water spraying, it shall not exceed 6.4mm.
6.4.4 Test furnace requirements
The time-temperature relationship and temperature control accuracy of the test furnace shall be in accordance with Table 4. Table 4
Time, min
Temperature, ℃
Temperature control accuracy, %
6.4.5 Specimen installation
CB/T3557—1995
The fire damper is in the open state, and the location of the temperature measuring point in the test furnace is as shown in Figure 3. B
Vertical installation
Horizontal installation
1-Fire resistance test furnace; 2-Fire damper; 3-Thermocouple for measuring furnace temperature 6.5 Leakage test
6.5.1 Test procedurebZxz.net
Install the closed fire damper to be tested on the static pressure box, use sealing material at the flange connection and confirm that there is no leakage, start the fan, adjust the pressure difference on both sides of the valve plate to 19.6Pa (2mm water column), and use a pitot tube to measure the air flow in the venturi tube. During the test, record the test room air temperature t and atmospheric pressure p at the same time, calculate the measurement results, and convert them into the leakage volume under standard conditions (20℃, 101.3kPa). The arithmetic mean of three consecutive tests should meet the requirements of Article 5.3.3. 6.5.2 The test result is calculated according to formula (1):
W—the air leakage under test conditions, m*/(m, min);
W—the average wind speed in the Venturi tube, m/s;
W—the calculated area of the fire damper under test, m. 6.5.3 The air leakage under standard conditions is converted according to formula (2): L.
(273+20)p
(273+t)101.3
W—the air leakage under standard conditions, m\/(m2, min);
(273+t)101.3
W—the air leakage under test conditions, m/(m·min). 6.5.4 The fire damper air leakage test device is shown in Figure 4. 8
（1）
CB/T3557-1995
1-fan: 2-air volume regulator: 3-venturi tube: 4-compensated micromanometer; 5-bit tube: 6-inclined micromanometer; 7-static pressure box 8-tested fire damper 6.6 Temperature action and non-action test of fire damper equipped with a fuse with a melting point of 70±3℃. 6.6.1 The test device is shown in Figure 5.
1-Wind speed test hole; 2-Preheating circulation pipe; 3-Rectifier pipe; 4-Switch valve; 5-Soft pipe; 6-Observation window: 7-Tested fire damper; 8-Temperature test hole; 9-Electric heater; 10-Fan; 11-Wind speed regulating valve 6.6.2 Temperature action test
6.6.2.1 Adjust wind speed
After the fire damper is installed, open the valve plate to a certain angle. Open the switch valves A and B, close the switch valve C, and then run the fan, adjust the wind speed regulating valve D, so that the wind speed through the tested damper is 1m/s. 6.6.2.2 Adjust the preheating temperature
Open the switch valve C, close the switch valves A and B, start the fan, and then connect the electric heater to preheat the air in the circulation pipe. When the temperature in the preheating pipe reaches the preset value, open the switching valves A and B, close the switching valve C, and measure the time required for the temperature of the hot air flow to rise from 85°C to 95°C through the tested fire damper. By adjusting the temperature controller, the temperature in the preheating pipe that takes 1 minute is set as the test preheating temperature.
6.6.2.3 Test procedure
CB/T3557-1995
Open the switching valve C, close the switching valves A and B, start the fan, and connect the electric heater to keep the temperature in the preheating pipe constant at the test preheating temperature. Open the switching valves A and B, and close C at the same time, so that the hot air flow passes through the tested valve body. When the air in front of the tested fire damper fuse reaches 85°C, start timing. The time until the fusible link melts and the valve plate closes is the action time, and the action air temperature is the action temperature. When the action temperature is within the range of 90±5°C and the action time is within 1 minute, it is qualified. 6.6.3 Non-action test
Use the test device shown in Figure 5 and perform the non-action test according to the method in 6.6.2. Keep the air temperature passing through the test valve body at 50±3℃. If the temperature fuse does not move within 5 minutes, it is qualified. 6.7 Fusible link melting temperature test
Put the temperature fuse equipped with fusible link in a water bath maintained at a temperature of 66~66.8℃. Start timing from 66℃. It shall not melt within 5 minutes. Then put it in a water bath maintained at a temperature of 72.In a water bath of 8 to 73°C, start timing from 73°C, and the fuse is qualified within 1 minute. 6.8 Valve plate opening angle test
6.8.1 Non-adjustable fire damper
Turn the handle to open the valve plate. It should be flexible and reliable when opening, and the opening angle should be 90°. 6.8.2 Adjustable fire damper
Turn the handle to open the valve plate in 15° steps within the opening angle range of 0° to 90°. Its action should be flexible and reliable, and the opening angle indication should be accurate.
6.9 Fire damper closing performance test
6.9.1 Manual closing test
Put the fire damper in the installation state, and open the valve plate to 90° or according to the step angle, and then operate the manual closing device for three consecutive times. The valve plate should act quickly, and the valve plate and handle should reset normally, sensitive and reliable. 6.9.2 Electric closing test
Put the fire damper in the installed state, and open the valve plate to 90° or according to the step angle, then connect the DC24±2.4V power supply at the terminals A and B of the electric closing device to close the valve plate quickly. For three consecutive times, the valve plate should move quickly, and the valve plate and handle should be reset normally. The closing current should not be greater than 0.7A each time. At the same time as the valve plate is closed, the micro switch is actuated to cut off the electromagnet current, and the signal end power supply is connected. The circuit diagram is shown in Figure 6.
Electromagnet
Micro switch
【+>A power supply
Interlock control signal line output
Figure 6 Electric closing interlock control circuit diagram
6.9.3 Fire damper closing reliability test
The fire damper is subjected to 250 switch action tests, and the valve plate should be closed manually or electrically from the fully open position each time. After the test, it should meet the requirements of 5.3.1.
7 Inspection rules
7.1 The inspection of fire dampers is divided into factory inspection and type inspection. 7.2 Factory inspection
7.2.1 Each fire damper shall be inspected by the quality inspection department of the manufacturer before leaving the factory. It can only leave the factory after passing the inspection and is accompanied by a certificate of conformity. 7.2.2 Factory inspection items and requirements are in accordance with Table 5. 7.3 Type inspection
7.3.1 Type inspection shall be carried out in any of the following situations: 10
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