CB/T 3841-2000 Side Boiler Drain Valve CB/T3841-2000 Standard download decompression password: www.bzxz.net

[CS 47. 020. 30
Record number: 7720-2000
People's Republic of China Shipbuilding Industry Standard
CB/T 3841-2000
Orderboard boiler discharge valve
Orderboard boiler discharge valve2000-09-20 Issued
National Defense Science, Technology and Industry Commission
2001-01-01 Implementation
CB/T 3841-20D0
The dimensions of the standard products are in accordance with the provisions of GB569 and GB2501. The main parts of the boiler discharge valve, the body and the cover, are made of 2G230-45CC. This material conforms to the provisions of the international major classification societies such as China CCS, British LR, Chinese GL, DNV and French BV. The relevant technical properties of the discharge shall comply with the provisions of the CCS classification society rules and are basically consistent with the requirements of the above-mentioned foreign classification society rules. This standard is issued by the National Machinery Standardization Technical Committee. This standard is under the jurisdiction of the China Shipbuilding Industry Comprehensive Technical and Economic Research Institute. This standard is issued by the China Shipbuilding Industry Comprehensive Technical and Economic Research Institute. The drafters of this standard are: Yao Rongyuan, Wang Qing
This standard is provided with a construction drawing. 1 Scope
CB/T3841-2000
Boiler discharge valve
This standard specifies the classification, installation requirements, test methods, inspection rules and markings, packaging and storage of boiler discharge valves (hereinafter referred to as discharge valves).
This standard is applicable to the design and manufacture of discharge valves with a working pressure of less than 2.5MPa. 2 Reference standards|| tt||The texts contained in the following standards constitute the text of this standard by reference in this standard. When this standard is published, the texts shown are valid. All standards will be revised. The users of this standard should consider the alternative of using the latest version of the following standards. G/T569-19G5 Tank Cover Connection Dimensions and Sealing Surfaces GB/T600-1991 General Technical Conditions for Ship Pipe Fittings GB/T2501-1989
Ship Flange Connection Dimensions and Sealing Rain (Four-position) GB/T 2501—1989
CB/T 44-1999
CB/T 772—14$8
Ship Crane Cast Steel Flange (Four-position)
Ship Crane Special Copper Flange
Carbon Tone and Magnetic Lightweight Laying Parts
CB/T 3027-1995
3 Classification
Total thickness of steel
3.1 The types of the relevant regulations are as follows:
A type--flange connection size cut sealing surface number GB/T569 discharge brand AS type--flange change size and sealing surface GBT2591 discharge network 2.2 Discharge rate of this disease 1.
Nominal pressure
Basic diameter of the valve
3.3A type and stem size of the valve are shown in Figure 1 and Table 2. ApplicablebzxZ.net
Applicable performance
Steam in. Water
Public resistance strength
Minglai machine
Conclusion
CB,T 3841—2000
1—Diagram; 2—body 13—call plate, 4—lubricated support 1 discharge flash structure type
Not 2A basic size
Strong flange size
3.4AS type discharge net appropriate form of the standard size diagram 1 and table 3.3
Nominal diameter
3.5 Marking example
Construction size
CB/T3841—2000
Thin 3AS to be continued basic size
Flange size
Nominal pressure is 2.5MIPa. Nominal diameter is 25 mm, flange connection size and cover are in accordance with GB/T 569 front test pot donkey relief valve marked as:
Rush release A25CB/T3841-2000
Nominal pressure is 2.5MPa. Male diameter is 40, flange size and face connection GB/T26501 whole side rust furnace release marked as:
Relief Yin
1AS40CB/T3841-2000
4 Technical requirements
4.tMaterial
4.1. Release main The materials of the main parts are selected according to Table 4. The materials should comply with the requirements of the relevant standards listed in Table 4. When there is no clear decision, the materials with the qualified certificate can be used for material inspection. The materials of the main parts are stainless steel. 2G230-4500 Q410-2 GCr1N112GCr ... 52331965
G2/T1223-[992
G/T1233—1992
4.2 If necessary, special inspection shall be carried out on the parts: each batch shall be a piece (or as specified in the order contract), and the chemical composition and mechanical age shall be taken according to CB/T172. 4.2 The casting wall shall be installed in accordance with C.B3927. 4.3 The dimensions of the joint and the dimensions of the sealing surface shall be as follows: The requirements for surface scanning are as follows: -A type discharge network GB/T665 and CE/T44; -AS type discharge network GR/T2501 and B2504. 4. When the leakage effect is reduced, please pay attention to the lighting version. When the ship is dead, there should be a joint ring outside the ship. If the protection cannot be used in the same situation as the ship, the 4.5 city pressure should be strengthened outside the test, and the tightness of the dynamic valve end should be checked. The pressure test bed is 1.5 times the maximum allowable pressure test bed, and the M test should be without exposure and you force. 6. The commercial case test should be carried out before the net plate is sealed. The test pressure is 1.1 The maximum allowable working pressure; the time resistance is 4. The opening degree of the four-disk network from closed to fully open is the limit value, which should meet the m value requirements in Table 2 and Table 3. 8
CB/3841—2000
The door opening and closing indication device can correctly display the opening state of the door. 4.B The dimensional tolerance and geometric tolerance of the door shall comply with the requirements of 3.1, 3.2, 3.3 and 3.1 of GB/T500—191. 4.9 The assembly quality of the door shall comply with the requirements of 3.4 and 3.5 of GB/T600—1991. 4.10 The quality of the door shall comply with the requirements of 3.7, 3.8 and 3.6 of GB/T6—1991. 5 Test (fast) method
5.1 The material test methods of the main components of the door shall comply with the requirements of the standards listed in Table 1. 5.2 The test method of the hydraulic strength test of the discharge chamber shall be in accordance with 4.3.1 of GN/T 6C0-1991. 5.3 The test method of the hydraulic tightness test of the discharge seat and the light seal pair shall be in accordance with 4.3.1 of GB/T6001991. 5.4 Opening and closing test of valve: After the valve is installed, the full stroke operation test of the valve plate from closed to fully open is carried out, and the valve stem travel difference value is measured. At the same time, the working stability of the opening indication is checked. 5.5 The items No. 3.4, 8.0, and 10 in Table 5 shall be re-inspected. According to the actual situation, the valve plate and the function selection method shall be used for position inspection. 6 Inspection and purchase
6.1 Inspection and acceptance of all output or parts shall be carried out by the manufacturing quality inspection department according to the requirements of this standard. The ordering party or the superior appraisal (or inspection) organization has the right to inspect the inspection items specified in this standard. 6.2 Inspection classification
The inspection specified in this standard is divided into two categories: type inspection and output inspection. 6.3 Type inspection
6.3.1 Inspection timing
Type inspection should be carried out in the following situations: 1) Trial and finalization of new products or old products transferred to the factory for production; 2) After formal production, if there are major changes in structure, materials and processes that may affect product performance; 3) During regular production, a regular inspection should be carried out after production; 4) When the product is stopped for a long time and resumed; 5) When the factory inspection results are significantly different from the last type inspection results; 6.3.2 Inspection items
Inspection requirements and requirements for type inspection.Table 5 Test items and key test results Test items Steel bolt thickness Connection size and design surface External strength test Seal and auxiliary sealing test Valve opening test Key test number Type inspection Factory test CB/T 3841--2000
6.3.3 The number of samples for type testing shall be determined by the manufacturer, the ordering party and the superior setting organization. 6.3.4 Evaluation plan
6.4.1 The evaluation criteria for material inspection shall be in accordance with the provisions of relevant material standards. 6.3.4.2 The evaluation criteria for the shell pressure test are that the internal test pressure cannot drop during the test, and there shall be no visible leakage or siltation on the surface and joints of the two-body valve. 6.3.4.3 The evaluation criteria for the sealing test of the valve seat and valve seal are that no leakage shall occur at the sealing of the valve seat during the test duration.
6.3.4.4 The judgment and execution rules of the inspection items numbered 3, 4, 8, 9, 10 in the packaging 5 shall be in accordance with the provisions of the clauses and regulations ...
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