This standard specifies the product classification, technical requirements, test methods, inspection rules and markings for fixed steel shutters. This standard applies to shutters used for ventilation of steel ships and water-based structures. CB/T 749-1997 Fixed Steel Shutters CB/T749-1997 Standard download decompression password: www.bzxz.net

ICS.47.020.50
Ship Industry Standard of the People's Republic of China
CB/T749—1997
Fixed steel shutters
Not-opening steel jalousies
Published on October 17, 1997
China Chaobo Industry Corporation
Implemented on June 1, 1998
CB/T749—1997
According to the requirements of SOLAS (1983 Amendment): "The main air inlet of all ventilation systems should be able to be closed outside the ventilated space", and the main ventilation openings on the walls above the dry deck with weathertight requirements must also have weathertight requirements. The original standard CB749-68 can no longer meet the requirements of SOLAS and use. For this reason, this standard has made a comprehensive revision of CB749-68 in terms of function, specification and structure. While retaining the structure and specifications of CB749--68, the standard adds weathertight shutters. The M-type shutters of this standard adopt the closing type of weathertight hatch covers in structure, and adopt detachable shutters with fixed blades and rodent-proof nets, insect-proof nets and fire-proof nets. Various nets can be placed in front of or behind the blades at the same time. Considering the needs of the vents, the weathertight cover plate adopts various thicknesses, and the live bolts used for tightening adopt two inversions. This standard specifies a total of 93 specifications. This standard will be implemented from the date of publication and will replace CB749--68. Appendix A of this standard is a prompt appendix.
This standard is proposed by the National Technical Committee for Ship Equipment Standardization. This standard is under the jurisdiction of Jiangnan Shipyard Group Co., Ltd. Drafting units of this standard: Tianjin Shipyard Company, China State Shipbuilding Corporation Comprehensive Technology and Economic Research Institute, Jiangyan Ship Machinery Factory. The main drafters of this standard: Luo Yiren, Liu Xiaolin, Zhou Yide, Shao Guoying. 1 Scope
Ship Industry Standard of the People's Republic of China
Fixed steel shutters
Not-opening steel jalousies
CB/T749-1997
Classification number: U26
Replaces CB749-68
This standard specifies the product classification, technical requirements, test methods, inspection rules and markings of fixed steel shutters (hereinafter referred to as shutters).
This standard applies to shutters used for ventilation of steel ships and water structures. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T8923-88 Rust grade and rust removal grade of steel surface before painting 3 Product classification
See Table 1 for product types and codes.
Table 1 Product Type and Code
Non-tight Steel Shutters
Weather-tight Steel Shutters
Left Open L
Note: The opening direction is when the person is outside, facing the opening surface of the cover. The structure and main dimensions of 3.2F type shutters are shown in Table 2 and Figure 1. Right opening R
Upward opening U
F type shutter main dimensions
Nominal dimensions
200X300
400X600
500×750
Overall dimensions
260X360
460×660
560X810
China State Shipbuilding Corporation 1997-10-17 approvede
Downward opening D
Number of bolts and nuts
(pcs)
1998-06-01 implemented
200× 300
400×600
CB/T749-1997
1--bolt; 2-nut; 3-gasket; 4-louver Figure 1F type louver structure
3.3M type louver structure and main dimensions see Figure 2, Figure 3 and Table 3. 1.5
500×750
CB/T749-1997
Net placed behind the blade
Net placed in front of the blade
Difference plate; 2-filler; 3-louver frame; 4-window seat; 5-fixed eye plate; 6-insect net (or fire net), 7-rat net; 8-blade; 9-ear plate, 10-bolt, 11-nut, 12-spring washer; 13-hinge; 14-spiral buckle; 15-hook; 16-handleFigure 2Main structure of M-type shutter
Side-falling spiral buckle
B,XLg×R
Side-falling buckle pressure plate
Buck pressure plate
CB/T749-1997
Forward-falling spiral buckle
Rail buckle pressure plate
Forward-falling buckle pressure plate
M-type shutter cover fixing device after opening
Fixing the cover with a hook
Fixing the entire plate with a spiral buckle
Note: The fixing form of the cover after opening can be selected at will, and its installation position is determined on site. Figure 3 Schematic diagram of some parts of M-type shutters Filler
Live joint burst bolt
Dish nut
Flat nut
Determined according to site needs
Nominal size
150×200
200×150
150×250
250×150
150×300
300×150
200×200
200×250
250×200
200×300
300×200
200X400
400×200
200×500
500×200
250×250|| tt||250×300
300×250
250×350
350×250
250X400
400×250
250×500||tt| |500×250
300×300
Cover shape
192×242
242X192
192X292
292×192
192×342
342×192
242×242
242X292
292×242
242X342
342×242
242X442
442×242
242×542
542×242
292×292
292×342
342×292
292×392|| tt||392×292
292×442
442×292
292×542
542×292
342×342
wall opening
B,XLXR
200X250X33
250X200X33
200X300X33
300X200X33
200×350×33
350X200X33|| tt||250X250X33
250×300X33
300X250X33
250X350X33
350×250×33
250X450X33
450 ×250X33
250×550X33
550X250X33
300X300×33
300X350X33
350X300×33
300×400×33
400×300×33
300X450X33
450×300X33
300X550×33
550X300X33
350X350X33
C B/T7491997
Main dimensions of M-type blinds
Window frame shape
250X300
300X250
250×350
350×250
250×400
400X250
300×300
300×350
350×300
300X400
400×300
300×500
500×300| |tt||300×600
600×300
350×350
350×400
400X×350
350×450
450×350
350×50 0
500 × 350
350 44
Nominal size
300×350
350×300
300×400
400X300
300X500
500 ×300
300×600
600X300
350×350
350×400
400×350
350×450||tt ||450X×350
400X400
400×450
450×400
400×500
500X400
400X6 00
600×400
400×700
700×400
450×450
450×500
500×450
cover Board shape
342×392
392×342
342X442
442×342
342×542
542×342||tt| |342×642
642X342
392×392
392X442
442×392
392X492
492×392| |tt||442X442
442X492
492×442
442×542
542×442
442X642
642 ×442
442×742
742×442
492X492
492×542
542×492
wall opening
B,XLXR
350X400X33
400X350X33
350X450X33
450×350×33
3 50×550×33
550X350X33
350X650X60
650X350X60
400X400×60|| tt||400X450X60
450X400×60
400X500X60
500X400X60
450X450 X60
450X500×60
500X450X60
450X550X60
550X450X60
450 X650X60
650X450×60
450×750×60
750X450×60
500X500X60
500X550X60
550X500×60
CB/T749—1997
Table 3 (continued)
Window frame shape
400 X450
450×400
400X500
500×400
400×600
600×400
400×700
700×400
450×450
450×500
500×450
450×550||tt ||550×450
500×500
500×550
550×500
500×600
600×500| |tt||512×712
712×512
512×812
812×512
562×562
562×61 2
612X562
Number of deductions per person
Weight, kg
Cover thickness A
Nominal size
450×550
550X450
500×500
500×550
550×500
500×600
600×500||tt| |500×700
700×500
500×800
800X500
550×550
550X600|| tt||600×550
550×650
650X×550
550×750
750X550
600×60 0
600X700
700×600
600X800
800×600
600X900*1
Cover shape
492X592
592×492
542×542
542×592
592×542
54 2×642
642×542
542×742
742X542
542X842
842×542||tt| |592X592
592X642
642×592
592X692
692×592
592×792|| tt||792×592
642X642
642X742
742×642
642×842
842X642
644×944
Opening of garden wall
Ba×LXR
500X600X60
600X500X60
55 0X550X60
550×600X60
600X550X60
550X650X60
650X550X60||t t||550X750X80
750×550X80
550X850X80
850X550X×80
600X600X 60
600×650×60
650X600X60
600X700X60
700X600X60
600 X800X60 | | tt | |650X850X80
850X650X80
660X960X80
600×1000*644×1044660×1060×80CB/T749-1997
Table 3 (continued)
Dense frame shape
562X662
662X562
612×612|| tt||612X662
662×612
612×712
712×612
612×812
812×61 2
612×912
912×612
662×662
662X712
712×662
662X 762
762×662
662×862
862×662
712×712
712×812
812×712
712×912
912X712
726X1026
762×1126
Screw male rail buckle number general||tt ||85M1614
Weight, kg
Cover plate thickness
108-10
Nominal size
Cover plate shape
Wall opening
CB/T749-1997
Table 3 (end)
Window frame shape
644X1244|660×1260×80
600×1200.
726×1326
600×1500-644×1544660×1560×80726×1626650×650
694X694
710X710X80
776×77 6
650×1050*694×1094710×1110×80776×1176694×1294710×1310×80776×1376650×1250*6
694×1594710×1610×8 0
650X1550*6
776×1676
700×700
700×800
800×700
700×900*
744X744
7 44×844
844X744
744×944
760×760X80
760X860X80
860X760X80
760X960X80
82 6X826
826×926
926×826
826×1026
700×1000*744X1044760X1060×80826×1126700×1100*744×1144 760×1160×80826×1226700×1200*744X1244760X1260X80826×1326700×1500*744×1544760×1560×80826X1626926×1126||tt| |800×1000*844X1044860X1060×80800×1100-844×1144860×1160×80926×1226800×1200*844×1244|860X1260×80926×1326800×1500-844×1544860×1560×80|926×1626Frame
95M2020
Spiral nipple numberwwW.bzxz.Net
Note: The nominal sizes with * are L and R, and the other nominal sizes are L, R, U, and D. 8
Weight, kg
Cover thickness
156.60164.50
176.30185.80195.30
194.50204.20
171.70180.50
202.60213.40224.20
186.70197.60
244+70
3.4 ​​Product marking
3.4.1 The marking consists of the following:
3.4.2 Marking example:
CB/T749 ---1997
Standard number
Opening direction
Cover thickness
Nominal size
Shutter type
Standard name
Nominal size B=200mm, L=300mm, F-type non-tight steel shutter: Shutter F200×300CB/T749—1997 Nominal size B=600mm, L=400mm, t=8mm, top-opening weathertight steel shutter: Shutter M600×400-8-UCB/T749--19974 Technical requirements
4.1 Materials for main components shall be as per Table 4.
Table 4 Materials of main parts
Parts name
Shutters
Spiral rolled buckle plate, hook, handle
Bolts, nuts
Hinges, pins, live bolts
Nuts
Rat-proof net
Fireproof net
Insect-proof net
Ordinary carbon structural steel
Stainless steel
Expanded Metal
GF3W0.63/0.200(plain weave)
GB5330--85
GF3W1.25/0.355(plain weave)
CB5330-85
Q235-A
1Cr18Ni9
GW1.2X12;GW2.0X18
h11-0. 2-GB 342
1Cr8Ni9
h11-0.355-GB 342
1Cr18Ni9
Standard No.
GB 700--88
GB1220--92
GB4423-92
GB11953--89
GB/T4240--·93
GB/T 424093
Aging resistant rubber: aging coefficient is greater than or equal to 0.8, tensile strength is greater than or equal to 15MPa, and Gunner hardness is 35~45HA.
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