Some standard content:
Shipbuilding Industry Standard of the People's Republic of China
CB/T3722--1995
Gas-tight doors
Published on December 19, 1995
Published by China State Shipbuilding Corporation
Implemented on August 1, 1996
Shipbuilding Industry Standard of the People's Republic of China
Gas-tight doors
Subject content and scope of application
2-1995
CB/T3722
Classification number: U26
This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, transportation and storage of marine gas-tight doors. This standard applies to gas-tight doors installed on the interface bulkheads of cabins with gas-tight requirements on military ships and civilian ships; it does not apply to doors with fire protection grade requirements.
2 Reference standards
GB191 Pictorial symbols for packaging, storage and transportation
GB6388 Shipping packaging receiving and delivery marks
GB11874 Opening directions and symbols for marine doors and windows CB/Z92 Anodizing treatment of aluminum alloy
3 Terms
3.1 Pressure differencepressure difference The difference in absolute air pressure between the inner and outer surfaces of the door of a confined area (cabin). 4 Product classification
Types and characteristics of airtight doors are as per Table 1
Airtight performance
Side opening type
Inflatable sealing strip seal
Airtight door
Sliding type
Inflatable sealing strip seal
Airtight door
Sliding type
Mechanical clamp seal
Airtight door
Opening direction\)
Left opening (L)
Right opening (R)
Left opening (L)
Right opening (R)
Left opening (L)
Right opening (R)
Note: 1) The definition of opening direction shall be in accordance with the provisions of GB11874. 4.2 Structure, specification and basic dimensions of airtight doors Approved by China State Shipbuilding Corporation on December 19, 1995 Door panel materials
Stainless steel (N)
Aluminum alloy (L)
Stainless steel (N)
Aluminum alloy (L)
Stainless steel (N)
Aluminum alloy (L)
Pressure difference maintenance value
Implemented on August 1, 1996
4.2.1 Type A airtight doors shall be in accordance with Figure 1 and Table 2.
4.2.2 Type B airtight doors shall be in accordance with Figure 2 and Table 3.
Through hole size
1600×600
1650×650
1700×700
1750×700
1700×750
1750× 750
1800×750
1800×800
Through hole size
1700×750
1700×900
1800×750
180 0×900
1800×1000
CB/T3722—1995
Surrounding wall opening size
1685×685
1735×735
, 1785×785
1835×785
1785X835
1835×835
1885×835
1885×885
Surrounding wall opening size
17 10×760
1710×910
1810×760
1810×910
1810×1010
Door leaf dimensions
H2×B2||tt| |1630×630
1680×680
1730×730
1780×730
1730×780
1780×780
1830×78 0
1830×830
Door leaf dimensions
1850×900
1850×1050
1950×900
1950×1050
1950×1150
Slide rail length
Door frame thickness
Weight, kg
Stainless steel
Aluminum alloy
Weight, kg
Stainless steel
Aluminum alloy
H: x B
CB/T3722—1995
1—door panel, 2-mineral wool, 3—inflatable sealing strip, 4—rubber gasket, 5—hinge, 6-door frame, 7-pressure reducing valve, 8—two-position three-way control valve, 9—lock, 10—drain valveCB/T3722—1995
1—door panel, 2—lock, 3—two-position three-way control valve, 4—window glass, 5—pressure reducing valve, 6—positioner, 7—upper guide rail, 8—roller device, 9—lower guide rail, 10—inflatable sealing strip, 11—buffer, 12—drain valve4.2.3 Type C airtight door shall be in accordance with Figure 3 and Table 4.
CB/T3722-—1995
1—door panel; 2—lock: 3—positioner; 4—door frame; 5—upper guide rail; 6—roller device 7—mechanical clamping device; 8—lower guide rail, 9—sealing strip 10—sealing handle: 11—buffer through hole size
1700×750
1700×900
1800×750
1800×90 0
1800×1000
4.3 Product marking
CB/T3722-1995
Surrounding wall opening size
1785×835
1785×985
1885×835
1885×985
1885×1085
Door leaf dimensions
H× B2
1835×830
1835×980
1935×830
1935×980
1935×1080
Slide rail length
Door frame thickness
Weight, kg
Stainless steel
Aluminum alloy
The product marking of airtight door is composed of product name, type, opening method, specification code, material code and this standard number in the following way: Airtight door
CB/T3722—1995
This standard number
Material code
Specification (through hole size×door frame thickness, H)
Opening direction
Type code
4.4 Marking example
The through hole size is 1700mm×750mm, the door frame thickness is 100mm, the sliding mechanical clamp seal, the right-opening stainless steel airtight door is marked as:
Airtight door CR1700×750×100NCB/T3722—1995The through hole size is 1800mm×800mm, the side-opening inflatable sealing strip seal, the left-opening aluminum alloy airtight door is marked as: Airtight door AL1800×800LCB/T3722-19956
5 Technical requirements
5.1 The main parts and materials of the airtight door shall be as shown in Table 5. Parts name
Window glass
Upper and lower guide rails
Roller device
Rubber gasket
Inflatable sealing strip
CB/T3722—1995
oCr19Ni9 or LF5
Tempered safety glass
Copper alloy or stainless steel
0Cr19Ni9 or LF5
OCr19Ni9
Assembly|| tt||Chloroprene rubber
According to Appendix A
Standard No.
GB3280-84 or GB3880-83
GB3280-84 or GB3880-83
GB3280-84
5.2 The surface of stainless steel doors shall be silvery white and metallic, and the thickness of door panels shall not be less than 0.8mm; the thickness of aluminum alloy doors shall not be less than 1.2mm according to the cabin decoration requirements.
5.3 Aluminum parts shall be oxidized according to CB/Z92; the surface of carbon steel parts shall be galvanized with a coating thickness of 35um, the surface of copper parts shall be chrome-plated with a coating thickness of 25μm, and stainless steel parts shall be ground and polished. 5.4 The height and width dimensional deviation of the door frame through hole shall be less than ±2mm, and the difference in the length of the two diagonals shall be less than 2.5mm. 5.5 The surface of the door should be flat, and its deflection should be less than 1.5mm. 5.6 The connection of door components should be firm, the installation position of accessories should be correct, the thickness of the window glass on the door should not be less than 8mm, the matching with the door should be good, and the sealing should be reliable.
5.7 After the airtight door is installed, the gap between the door and the door frame should not be greater than 5mm, and the door should be flexible when opening and closing without blocking. 5.8 The inflatable sealing strip should comply with the provisions of Appendix A (Supplement). The inflatable working pressure is 0.2MPa, and the air pressure of the pressure reducing valve is 0.7MPa.
5.9 The airtight door should have good airtightness after closing. A and B type airtight doors should have air with a pressure of 0.2MPa blowing into the door gap, and C type airtight doors should have no leakage in the airtight smoke test; when there is a pressure difference between the inner and outer surfaces of the door, it should meet the requirements of Table 6. Table 6
Test method
6.1 Opening and closing test
Pressure difference between inside and outside of the door, Pa
The change in pressure difference between inside and outside of the door per hour shall not exceed 3%; the pressure difference shall not drop to 0 within 5 minutes
The airtight door shall be installed according to the actual ship. In the use condition, the door is in the open state, and force is applied to the door handle to test its opening and closing flexibility. 6.2 Blowing test
CB/T3722—1995
Close the airtight door, and the inflatable sealing strip is in the working state. Use air with a pressure of not less than 0.2MPa and a pipe with an outlet diameter of not less than 5mm to blow air into the door gap. Apply soapy water to the other side of the door gap to test its sealing. 6.3 Airtight smoke test
The airtight door shall be installed according to the actual ship and assembled in the test cabin. Ignite the smoke-generating material in the test cabin. Close the airtight door, put the mechanical clamping device in working state, check the sealing performance of the door, 6.4 Air pressure test
The airtight door is installed in the actual ship and is well assembled in the test cabin. Close the airtight door, put the inflatable sealing strip (or mechanical clamping device) in working state, pressurize the interior of the simulated test cabin, make the pressure difference reach the requirements of Table 6, and detect the change in the pressure difference. 7 Inspection rules
7.1 Factory inspection
7.1.1 Before the product leaves the factory, the manufacturer shall conduct an appearance inspection of each door according to the provisions of this standard. 7.1.2 Check the dimensions of the door frame and door door by door, which shall comply with the provisions of Table 2 (or Table 3, Table 4) and Articles 5.4 to 5.5. 7.1.3 Carry out opening and closing tests on all airtight doors in accordance with Article 6.1, which shall comply with the provisions of Article 5.7. 7.1.4 Type A and B airtight doors shall be tested for airtightness smoke in accordance with the provisions of Article 6.2, and Type C airtight doors shall be tested for airtightness in accordance with the provisions of Article 6.3. The door gaps shall be qualified if there is no smoke escaping. The airtightness inspection shall be carried out. The soapy water applied to the door gaps shall be qualified if there are no soap bubbles. 7.1.5 If the airtight door under test is found to be unqualified, it is allowed to be tested again after correction. It can only be shipped after passing the re-inspection. The qualified products shall be issued with a product inspection certificate by the manufacturer. Products approved by the classification society shall have a ship inspection approval certificate. 7.2 Type inspection
The product shall be subjected to type inspection in one of the following situations: new product finalization identification;
When the structure, material or process of the formally produced product has a major change that may affect the product performance; when the national quality supervision agency puts forward type inspection requirements. 7.2.2 In addition to all the items specified in Article 7.1, the inspection items shall also be subjected to air pressure tightness test according to the test method specified in Article 6.3, and the results shall meet the requirements of Table 6.
7.2.3 Sampling method: During batch production, one fan of each type A, B, and C shall be randomly selected from qualified products for type inspection. If the test does not meet the requirements of Table 6, the test shall be doubled. If it fails again, the whole batch of products shall be tested and the test shall be corrected until all are qualified. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The following product markings shall be marked on the obvious parts of the product: a.
Manufacturer name or trademark;
Product name;
Product mark;
Manufacturing date or production batch number;
Inspection pass stamp.
8.2 PackagingWww.bzxZ.net
Products shall be packaged with non-corrosive materials. 8.2.2
The packaging box shall have sufficient strength and moisture-proof measures. The products placed in the box shall be ensured not to affect each other. 8.2.4
After the product is packed, there must be a packing list and product inspection certificate in the box. 8.2.5
The markings on the packaging box should comply with the provisions of GB6388. CB/T3722—1995
8.2.6 The packaging box should have obvious words and signs such as "moisture-proof" and "handle with care", and the graphics should comply with the provisions of GB191. 8.3 Transportation
8.3.1 The product can be shipped by any means of transportation, and rain protection measures should be taken. 8.3.2 The product should be loaded and unloaded in an appropriate manner to ensure that the product's geometric shape remains unchanged and the surface is intact. 8.4 Storage
8.4.1 The product should be placed in a ventilated and dry place Dry place, strictly prohibit contact with acid, alkali, salt substances, and prevent rain from intrusion. 8.4.2 The product should not directly contact the ground, and the bottom should be raised by more than 100mm. A1 Section shape
The surface shape and size of the sealing strip are as shown in Figure A1
A2 Working conditions
A2.1 Operating temperature: -40～120℃.
A2.2 The inflation working pressure is 0.2MPa.
CB/T3722-—199 5
Appendix A
Inflatable sealing strip
(Supplement)
A2.3 The fillet radius of the door frame corner is R=50~100mm. A2.4 The sealing strip is convex after inflation and naturally returns to a concave shape after the air is released. A3 Technical requirements
The sealing strip should be made of natural rubber or synthetic rubber that is resistant to seawater and ultraviolet rays. A3.1
A3.2 The physical properties of the sealing strip should comply with the requirements of Table A1. Table A1
Hardness (Shore)
Tear strength, MPa
Tear elongation, %
Compression set, %
Aging coefficient (70℃, 72h)
1*Standard oil
120℃×24h
Brittle temperature, ℃
Oxygen index
Performance index
≥250
≤25%
≤20%5 If the airtight door under test is found to be unqualified, it is allowed to be tested again after correction, and it can only be shipped after passing the re-inspection. The manufacturer shall issue a product inspection certificate for qualified products. Products approved by the classification society shall have a ship inspection approval certificate. 7.2 Type inspection
Products shall be subject to type inspection in any of the following situations: new product finalization identification;
When the structure, material or process of the formally produced product has a major change that may affect the product performance; when the national quality supervision agency proposes a type inspection requirement. 7.2.2 In addition to all the items specified in Article 7.1, the inspection items shall also be subject to air pressure tightness test according to the test method specified in Article 6.3, and the results shall meet the requirements of Table 6.
7.2.3 Sampling method, during batch production, one door of type A, B and C shall be randomly selected from the qualified products for type inspection. If the test does not meet the requirements of Table 6, the test shall be doubled. If it fails again, the batch of products shall be fully inspected and corrected until all are qualified. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The following product markings shall be marked on the obvious parts of the product: a.
Manufacturer name or trademark;
Product name;
Product mark;
Manufacturing date or production batch number;
Inspection pass stamp.
8.2 Packaging
Products shall be packed with non-corrosive materials. 8.2.2
The packaging box shall have sufficient strength and moisture-proof measures. The products placed in the box shall ensure that they do not affect each other. 8.2.4
After the products are packed, there shall be a packing list and product inspection certificate in the box. 8.2.5
The markings on the packaging box shall comply with the provisions of GB6388. CB/T3722—1995
8.2.6 The packaging box should have obvious words and signs such as "moisture-proof" and "handle with care", and its graphics should comply with the provisions of GB191.8.3 Transportation
8.3.1 The product can be shipped by any means of transportation, and rain protection measures should be taken.8.3.2 The product should be loaded and unloaded in an appropriate manner to ensure that the product geometry remains unchanged and the surface is intact.8.4 Storage
8.4.1 The product should be placed in a ventilated and dry place Dry place, strictly prohibit contact with acid, alkali, salt substances, and prevent rain from intrusion. 8.4.2 The product should not directly contact the ground, and the bottom should be raised by more than 100mm. A1 Section shape
The surface shape and size of the sealing strip are as shown in Figure A1
A2 Working conditions
A2.1 Operating temperature: -40～120℃.
A2.2 The inflation working pressure is 0.2MPa.
CB/T3722-—199 5
Appendix A
Inflatable sealing strip
(Supplement)
A2.3 The fillet radius of the door frame corner is R=50~100mm. A2.4 The sealing strip is convex after inflation and naturally returns to a concave shape after the air is released. A3 Technical requirements
The sealing strip should be made of natural rubber or synthetic rubber that is resistant to seawater and ultraviolet rays. A3.1
A3.2 The physical properties of the sealing strip should comply with the requirements of Table A1. Table A1
Hardness (Shore)
Tear strength, MPa
Tear elongation, %
Compression set, %
Aging coefficient (70℃, 72h)
1*Standard oil
120℃×24h
Brittle temperature, ℃
Oxygen index
Performance index
≥250
≤25%
≤20%5 If the airtight door under test is found to be unqualified, it is allowed to be tested again after correction, and it can only be shipped after passing the re-inspection. The manufacturer shall issue a product inspection certificate for qualified products. Products approved by the classification society shall have a ship inspection approval certificate. 7.2 Type inspection
Products shall be subject to type inspection in any of the following situations: new product finalization identification;
When the structure, material or process of the formally produced product has a major change that may affect the product performance; when the national quality supervision agency proposes a type inspection requirement. 7.2.2 In addition to all the items specified in Article 7.1, the inspection items shall also be subject to air pressure tightness test according to the test method specified in Article 6.3, and the results shall meet the requirements of Table 6.
7.2.3 Sampling method, during batch production, one door of type A, B and C shall be randomly selected from the qualified products for type inspection. If the test does not meet the requirements of Table 6, the test shall be doubled. If it fails again, the batch of products shall be fully inspected and corrected until all are qualified. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The following product markings shall be marked on the obvious parts of the product: a.
Manufacturer name or trademark;
Product name;
Product mark;
Manufacturing date or production batch number;
Inspection pass stamp.
8.2 Packaging
Products shall be packed with non-corrosive materials. 8.2.2
The packaging box shall have sufficient strength and moisture-proof measures. The products placed in the box shall ensure that they do not affect each other. 8.2.4
After the products are packed, there shall be a packing list and product inspection certificate in the box. 8.2.5
The markings on the packaging box shall comply with the provisions of GB6388. CB/T3722—1995
8.2.6 The packaging box should have obvious words and signs such as "moisture-proof" and "handle with care", and its graphics should comply with the provisions of GB191.8.3 Transportation
8.3.1 The product can be shipped by any means of transportation, and rain protection measures should be taken.8.3.2 The product should be loaded and unloaded in an appropriate manner to ensure that the product geometry remains unchanged and the surface is intact.8.4 Storage
8.4.1 The product should be placed in a ventilated and dry place Dry place, strictly prohibit contact with acid, alkali, salt substances, and prevent rain from intrusion. 8.4.2 The product should not directly contact the ground, and the bottom should be raised by more than 100mm. A1 Section shape
The surface shape and size of the sealing strip are as shown in Figure A1
A2 Working conditions
A2.1 Operating temperature: -40～120℃.
A2.2 The inflation working pressure is 0.2MPa.
CB/T3722-—199 5
Appendix A
Inflatable sealing strip
(Supplement)
A2.3 The fillet radius of the door frame corner is R=50~100mm. A2.4 The sealing strip is convex after inflation and naturally returns to a concave shape after the air is released. A3 Technical requirements
The sealing strip should be made of natural rubber or synthetic rubber that is resistant to seawater and ultraviolet rays. A3.1
A3.2 The physical properties of the sealing strip should comply with the requirements of Table A1. Table A1
Hardness (Shore)
Tear strength, MPa
Tear elongation, %
Compression set, %
Aging coefficient (70℃, 72h)
1*Standard oil
120℃×24h
Brittle temperature, ℃
Oxygen index
Performance index
≥250
≤25%
≤20%
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.