Some standard content:
Shipbuilding Industry Standard of the People's Republic of China
CB 455—91
Pressure Water Tanks
Published on November 8, 1991
China State Shipbuilding Corporation
Implemented on July 1, 1992
Shipbuilding Industry Standard of the People's Republic of China
Pressure Water Tanks
Topic Content and Applicable Scope
CB 455--9t
Classification Number: B42
Replaces CB 455—74
This standard specifies the classification, technical requirements, test methods, inspection rules, packaging and transportation of pressure water tanks. This standard applies to pressure water tanks for fresh water pipe systems and sanitary water pipe systems for living on ships and drilling platforms. 2 Reference standards
GB573 Marine lap-welded steel flanges
GB:712 Structural steel for hulls
GB 2506 Marine lap-welded steel flanges (four-position) (iB3323 Radiography and quality classification of steel fusion-welded butt joints GB1103? Hydraulic test methods for auxiliary boilers and pressure vessels for hulls ZBU11005 Inspection of raw materials for marine auxiliary boilers entering the factory 3 Product classification
9.1 Pressure water tanks are divided into pairs: Type A hanging with flange: Type B - hanging with manhole: Type C - support with manhole. 3.2 The structural model of the pressure water tank is shown in Figure 1
3.3 The series parameters of H-type water tanks, the water inlet and outlet dates and the support dimensions are shown in Table 1: 3. Year marking example
Type B, pressure water tank with a volume of (.5m:
That water tank B0.5 CI 455-91
C type, volume 0.51m3 pressure tank
1 Pressure tank C (1,5 CB 455-9)
Approved by China State Shipbuilding Corporation on 1991-118 and implemented on 1992-07-01
CB 455-91
Comply with the following pressure water tank type
One stop cabinet: 2 One manhole cover: 1 One manhole cover: 1 One manhole cover: 5 One manhole cover: 6 One manhole cover: 7 One manhole cover: 8 One safety valve type C
Maximum working pressure
4 Technical requirements
..1 Structural requirements
9061190
CB 455-91
950 42
2 521654
4.1.1 A complete set of pressure water tanks shall include a liquid gauge, a safety valve, an air stop valve, a filter, a pressure gauge and a pressure relay. These accessories shall meet the application requirements.
4.1.2 When the inner diameter of the pressure water tank is greater than or less than 700mm, a manhole shall be provided. The diameter of the circular manhole shall not be less than 400mm, and the size of the waist-shaped manhole shall not be less than 3mm×mm
4.1.3 The pressure water tank shall be equipped with a safety cover. The opening pressure of the safety device shall be greater than the working pressure and less than the design pressure. 1.4 The technical requirements and dimensions of the inlet and outlet connection flanges of the pressure water tank shall comply with the requirements of GB573 or GB2506. 4.1.5 The body of the pressure limiting water tank shall be able to withstand the upper. 5 times the design pressure without damage and obvious deformation. After assembly, the complete set of pressure water tanks should be leak-proof when doing a tightness test at 1.25 times the design pressure. 4.2 Manufacturing requirements
4.2.1 The head and the shell should be formed by mechanical cold processing or hot processing, but hammering shall not be used. When the head is formed by heat reduction, overburning shall not occur:
4.2.2 The roundness of the pressure water tank shell refers to the difference between the maximum inner diameter and the minimum inner diameter measured on the kitchen surface, which should not be greater than % of the design inner diameter of the cutting surface.
4.2.3 The minimum wall thickness of the pressure water tank head after ring forming shall not be less than 90% of the design thickness. 4.2.4 When rolling the shell, it is necessary to prevent the shell from being skewed, bent, tapered and bulged. After assembly, the straightness of the pressure water tank shell CB 455-91
shall not exceed 1.5mm per meter length and 3mm for the entire length. +、Mask welding conditions
,3.1 The welding of pressure water tanks must be carried out in accordance with the "Welder Examination Rules" issued by the ship inspector, and must be undertaken by qualified welders, and the welder's code stamp must be stamped on the welding line. 4.3.2 Before hoop welding, the low-carbon, damp oil and other dirt that affect the welding quality within the 25mm area of the weld groove should be removed. 4.3.3 The welding materials for pressure water tanks should be hydrogen-resistant and inspected in the factory according to the requirements of BU41005. 3.4 When the explosion environment has any of the following conditions, welding shall not be carried out without effective protective measures. a. The wind speed is high or 10ms: b. The relative humidity is greater than 90%; s. It is raining, d. It is raining. 4.3.5 When the welding temperature is lower than 0 When welding, the area within 100mm of the weld should be preheated to about 1°C. 4.4 Welding maintenance requirements
4.4.1 The weld surface should be uniform and dense, and should not have cracks, weld bumps, clips, arc pits, or incomplete pits. If there are any defects, they should be adequately filled.
4.4.2 The undercut depth of the weld surface shall not exceed 0.1nm, the continuous length of the undercut shall not exceed 1mm, and the total length of the undercut on both sides shall not exceed the length of the warp
4.4.3 The weld and the parent material should be smooth.
4.4.4 The slag and splashes on both sides of the weld must be removed immediately. 4.4.5 The roughness of the weld after grinding shall not be less than the nominal thickness of the parent material minus the negative offset of the steel plate. 4.6 The assembly welding of the pressure water machine shall not have a cross weld, and the head and stop The distance between the longitudinal welds between the sections and the cylinder sections shall not be less than 12m. .4.7 The welding process of the first pressure water tank shall be approved and the welds shall be subjected to X-ray inspection. The batch-produced pressure water tanks can ensure the product quality in terms of process and can be X-ray inspected in batches of 30 to 10 sets. 4.5 Material requirements
[The materials of the body and manhole cover of the pressure water tank shall be made of stainless steel. The technical requirements of the materials shall comply with the provisions of Class B in the G1712 standard. The inspection of raw materials upon entry into the factory shall be in accordance with the requirements of Z.BU1005. 4.6 Assembly requirements
4.6.1 The repulsion relay of the pressure water tank shall be able to ensure the automatic start and stop of the water supply pump under the specified low/high pressure to meet the effect of automatic water supply.
4.6.2 Strength test of the body of the pressure water tank After passing the test, the inner surface shall be derusted and polished. Then apply non-toxic epoxy paint. 4.6.3 After passing the pressure water phase strength test and tightness test, the outer surface shall be derusted and painted with anti-rust primer and gray topcoat. 5 Test method
5.1 Appearance inspection
Inspect the appearance, material selection, accessories, size, etc. of the pressure tube. The inspection results shall comply with the requirements of 4.1.1:1.1.24.2:4.4.1~4.4.6; 4.6.
5.2 Weld inspection
5.2.1 The inspection content of the welding test plate includes positive bending test, reverse bending test, tensile test of coal joints, macroscopic test, fracture structure inspection, etc. The welding plate shall be 100% X-rayed, and the film evaluation shall be in accordance with C:B3323. The weld grade is considered qualified. 5.2.2 Each weld key of the product shall be 10% X-rayed. The film evaluation is in accordance with GI3 3323. The weld grade is considered qualified. 5.2.3 When unacceptable defects are found on the weld, they are allowed to be repaired after removal. After repair, X-ray filming is performed. The number of repairs on the same part should not exceed two times.
5.3 Strength test and tightness test
5.3.1 After the cabinet body is manufactured and passed the inspection, a strength test should be carried out. The test method should be carried out in accordance with GR11(37. The test results should meet the requirements of 1.1.,
CB 455 --91
5,3.2 The bottom pressure water tank is tested for exhaustion after passing the exhaustion test. The test uses water as the medium and the test force is 2 times the non-exhaust force. During the test, the pressure should be slowly increased to 1, and after reaching the specified test low force, it is operated for 5 minutes, and then reduced to the design proof force. The welds and connection parts are checked to see if they meet the requirements of Article 4.1.5: 5.4 Pressure relay action test
The pressure water tank is connected to the water source. Under the specified low and high conditions, observe whether it can start to supply water and stop supplying water. The result should meet the requirements of Article 1. Requirements.
5.5 Opening and reseating test of safety valve
After the compression test of the safety valve is qualified, adjust the safety valve to the required value, conduct opening and reseating test, the opening pressure is the working pressure and less than the designed force, the intermediate seat force is 0.85 times of the working force, conduct three consecutive tests, and shall meet the requirements of Article 4.1.3. 6 Inspection rules
6.1 Inspection is divided into factory inspection and type inspection
6.2 Each hydraulic unit shall be inspected and can be shipped only after passing the inspection. 6.3 After the full range of conditions: the hydraulic unit shall be inspected for type inspection. a.For new products or products produced in a new factory, if the product design, process or materials have been significantly changed and are sufficient to affect their main performance, they shall be mass-produced in four years. 6.4 Items for inspection and type inspection are listed in Table 2 Table 2
Test items
Type sequence
External sinking qualification
Strength and continental test
Electrical action test
Good calibration
Safety inspection
Marking, random documents, spare parts and storage
7.1 Each low-pressure water supply is equipped with a corrosion-resistant nameplate at its exposed position. The nameplate should indicate the following: a. Product name:
Manufacturer name:
Model and standard number:
Workmanship:
Heavy ball: || tt||Confidential;
h. Manufacturing number
, manufacturing year and date
Ship inspection mark.
7.2 The following documents should be sent to the pressure water tank of the sensitive station: a. General drawing,
b. Supply technical specifications;
c. Factory inspection quality guarantee:
d. Registration certificate 15
7.3 Each pressure water tank should be accompanied by the following spare parts: a. Insulation gauge;
b. Power relay. Www.bzxZ.net
In addition, the pressure water tank should be stored indoors in an explosive atmosphere, with additional instructions:
CB 455—91
This standard was proposed by the China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the Yangfu Wengfu and Anti-pollution Technical Committee. This standard was initiated by the 603rd Institute and Hudong Shipbuilding, and the 704th Institute was responsible for the fundraising. The main drafters of this standard are Chong Chongxin, Wu Zhongqi, Ding Yankun, Zhang Yinquan, and Sun Hongjiu. Published by China Standards Press, printed by China Standards Press, Beijing Printing Factory, May 1992, first edition, May 1992, first printing, No. 155066-2-821H1695
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