Some standard content:
dtp a. 95.s
GB3765
1.6 The shape and position tolerance of the hexagonal head of the part shall comply with the provisions of GB3103.1-82 "Tolerances of Fasteners Bolts, Screws and Bolts".
1.7 The verticality tolerance of the support surface (sealing surface) of the end of the end of the pipe joint body to the axis of the thread is 0.10mm, and the verticality tolerance of the face of the compression thread of the butt joint body to the axis of the thread is 0.10II. 1.8 The d and d axes of the joint body to the dz axis, the de axis to the tide line: the dg axis of the right-angle joint body to the d axis; the mountain axis of the screw to the dz axis; the d and d axes of the cone ring to the d, axis: the 1) axis of the hinged hexagonal bolt to the d axis: the 2, d and 86 cone axis of the ferrule to the d axis, and the D axis of the sharp-angle sealing gasket to the d axis are all 0.20mm. 1.9 The tolerance of the parallelism of the A surface of the articulated joint body to the axis of d is 0.10mm1m, and the tolerance of the parallelism of the A surface to the C surface is 0.05mm1.10 The runout tolerance of the sharp angle ring of the hexagonal bolt to the axis is 0.05mm, and the dimension B of the angle sealing ring should be equal, and the difference is not greater than 0.mm. The verticality tolerance of the plane of the D of the articulated hexagonal bolt to the axis of d and the plane of the D of the angle sealing gasket to the axis of d are both 0.10mm.
1.11 The limit deviation of the S size of the parts is old. 1.11.1 The limit deviation of the S size of the mechanical force [1 shall be in accordance with the provisions of Table 2. Table 2
The limit deviation of the S dimension of castings and die forgings shall be in accordance with the provisions of Table 3: 30
Limited deviation
GB 9765-83
- 0,84
1.12 The limit deviation of the dimension of the part with tolerance and the tolerance of shape and position without tolerance. -1.00
1.12.1 The limit deviation of the dimension of the metal cutting part without tolerance shall be in accordance with GB1804-79 "Limit deviation of dimension of tolerance and fit without tolerance" Js14 or is14 grade. 1.12.2 The tolerance of shape and position without tolerance of parts shall be in accordance with GL1184-8 "Provisions for tolerance of shape and position without tolerance" C grade. 1.13 The dimensions of the joint casting and die forging shall be in accordance with the provisions of Figure 2 and Table 4. The dimensions of Ri and R2 are determined by the process. 8
(bar)
Outer diameter of pipe
(bar)
GB3765—83
Continued Table 4
Outer diameter of pipe
1.14 The chamfer and fillet radius of the outer circle and inner hole of the parts shall comply with the provisions of JB5-59 "Chamfer and fillet radius of parts". 1.15 The parts shall be marked according to the following provisions according to the nominal pressure. Nominal pressure 160 bar marking symbol
Nominal pressure 250 bar marking symbol G
Nominal pressure 400 bar marking symbol J
The outer diameter of the pipe shall be marked after the symbol, for example: the nominal pressure is 160 bar, the outer diameter of the pipe is 14mm and it is marked as E14. The mark of the straight joint body is marked on the S surface.
The mark of the right angle, tee and cross joint body is marked on the S surface. The articulated joint body is marked on four sides. 1. The ferrule; the sharp-angle sealing gasket and the cone ring are marked on the largest outer diameter surface, and the articulated hexagonal bolt is marked on the end surface. 1.16 The maximum external dimensions of all parts in this standard are the external dimensions of the ferrule without being assembled with the pipe. 2 Inspection rules
2.1 Factory inspection items for ferrule-type pipe joints
2.1.1 Appearance inspection
GB $765:83
2.1.1.1 The surface of the part should be smooth and no mechanical damage such as pores, sand holes, cracks, burrs, curling, scratches, rust, thread breakage, etc. is allowed.
2.1.1.2 The surface of the parts that are not machined is allowed to have depressions and indentations that do not exceed half of its dimensional tolerance. 2.1.1.3 The unprocessed surface of the parts that are machined is allowed to have defects that are allowed in the technical conditions of the raw materials. 2.1.2 Inspection of main dimensions
2.1.2.1 The threads on the parts shall comply with the provisions of 1.3 of this standard. 2.1.2.2 The dimensions on the parts with dimensional tolerance and shape and position tolerance requirements shall comply with the corresponding provisions of the part standard and this standard. 2.1.3 Inspection of working performance of ferrules
2.1.3.1 Metallographic inspection of ferrules
2.1.3.1.1 The mechanical properties of the ferrules after heat treatment shall comply with the provisions of 1.1.3 of this standard. 2.1.3.1.2 The metallographic test pieces of the ferrules after polishing and corrosion shall be subjected to metallographic inspection of the hard layer depth, surface hardness and core hardness. The test piece shall be selected on the section perpendicular to the axis of the ferrule, and the load surface shall be 1.1~1.6mm away from the front end of the ferrule. Each measuring point shall be taken on the maximum and minimum depth lines of the inner and outer hard layers, and the line spacing shall be 1.3m. 2.1.3.1.3 The depth of the hardened layer is measured by a metallographic microscope, and the average reading of each measuring point is taken. At least 5 different points should be taken for measurement, and at least 2 to 3 measuring points should be taken for the inner and outer hardened layers. 2.1.3.1.4 The surface hardness is measured by a Vickers or microhardness tester, and at least 6 different points should be taken for measurement. At least 2 fixed points are taken for the inner and outer hard layers, and the load is 100g.
2.1.3.1.5 The core hardness is measured by a Vickers or microhardness tester, and at least 3 points are measured. The core hardness is required to be IIV220~300, and the load is 200g.
2.1.3.2 Cutting test of ferrule
2.1.3.2.1 In order to check whether the cutting edge of the ferrule can be cut into the seamless steel pipe to be connected, and no local cracking of the cutting edge occurs, a cutting test should be performed (see Figure 3). The ferrule to be inspected shall comply with the provisions of 1.1.3 of this standard, and the seamless steel pipe used for inspection shall comply with YB231-70 "Seamless Steel Pipe" (No. 10 or 20) and GB2270-80 "Stainless Steel Seamless Pipe" (1Cr18Ni9Ti). Figure 3
2.1.3.2.2 After pre-installation and cutting, the cutting edge of the ferrule shall not become blunt, and the cutting marks on the pipe shall be regular. The tail of the ferrule shrinks along the diameter and should hold the connected pipe. The ferrule is allowed to rotate slightly on the pipe, but it shall not be loose. 2.1.3.2.3 The outer circle of the pre-installed ferrule shall not leave marks on the end face of the tapered hole in the joint body due to the excessive protrusion of the middle part, and the outer circle of the other end of the ferrule shall not damage the tapered surface of the joint body. 2.2 Sampling inspection method of ferrule type pipe joints 2.2.1 The ordering unit can conduct sample inspection on the products delivered by the manufacturer according to this rule to determine whether the batch of products delivered is qualified to determine whether to accept or reject. The inspection items are mainly technical requirements such as size and ferrule performance. Technical requirements other than the inspection items listed in this rule are controlled by the manufacturer, or the inspection method is negotiated by the ordering unit and the manufacturer. 2.2.2 The internal inspection of the manufacturer can be carried out by the factory quality inspection department according to the corresponding product technical requirements for the products to be inspected according to the sampling method of this rule GB-3765-83
, and the qualified product batches will be issued with product certificates. 2.2.3 The manufacturer has the right to use other methods to conduct internal inspection, but must ensure that the products meet the specified technical requirements. 2.2. Sampling plan
This rule adopts the counting sampling plan, including primary sampling and secondary sampling. 2.2.4.1 Sampling plan table
The scope of approval for each inspection item and the corresponding sampling plan are shown in Table 5. Table 5 Sampling acceptance plan table
Acceptance level (based on non-inspection items
Appearance and main dimensions
Flange working performance
Qualified product rate)
Number of first random inspection
-Number of second random inspection
AFirst qualified judgment number
R. ·Number of unqualified judgments
4, second qualified judgment number
R—Second unqualified judgment number
2.2.4.2 Inspection process of single sampling plan Batch range
(pieces)
1000-3000
3000-10000
>10000
Each
Sample size m
(single sampling)
Number of judgments
Ae, Re
Randomly select samples (n) from the batch, and judge whether the batch is qualified based on the inspection results of the samples. If the number of unqualified products in the sample (d) is less than or equal to the specified qualified judgment number (dA), then this batch of products is a qualified batch and can be accepted. If the number of unqualified products in the sample is greater than or equal to the unqualified judgment number (d>R.), then this batch is an unqualified batch and is rejected. 2.2.4.3. The inspection procedure of the secondary sampling plan is to first randomly select the -th sample (unit product number n) from the batch. Determine whether the batch is qualified based on the inspection result of the -th sample, or conduct a second inspection. If the number of unqualified products in the sample (d) is less than or equal to the first qualified judgment number (d, 4), the batch is a qualified batch and can be accepted. If the number of unqualified products is greater than or equal to the first unqualified judgment number (dR), the batch of products is an unqualified batch and is judged to be withheld. If the number of unqualified products is between the qualified judgment number and the unqualified judgment number (A, d, R.), a second inspection is required, that is, to draw a second sample from the same batch (n2, this rule stipulates that nz=n). Determine whether the batch is qualified based on the inspection result of the second sample plus the result of the -th sample. If the sum of the number of unqualified pieces contained in the two samples (dj+d) is less than or equal to the second qualified judgment number (d, dA), the batch is a qualified batch and can be accepted; if the sum of the number of unqualified pieces is greater than or equal to the second non-qualified judgment number (d, +dzRe), the batch is a non-qualified batch and is judged to be rejected. 2.2.5 Instructions for use
2.2.5.1 If one of the technical indicators is unqualified, the batch is unqualified. 2.2.5.2 If a certain indicator has been found to be unqualified during the inspection process, it is not necessary to conduct subsequent inspection items. GB3765-83
2.2.5.3 The order of each inspection item can be negotiated by the supply and demand parties, and this rule does not stipulate it. However, it should be noted that the inspection of the next item must be carried out on the basis of the qualified inspection of the previous item. 2.2.5.4 The orderer has the right to reject the non-qualified products found during the inspection process, regardless of whether the product is part of the sample or whether the batch is judged to be accepted.
3 Packaging and marking
3.1 The finished product should be free of dirt and metal chips. The surface of parts without metal coating should be coated with rust inhibitor to prevent corrosion during transportation and storage. Under normal transportation and storage conditions, it should be guaranteed to be rust-free for half a year from the date of leaving the factory. 3.2 Components or parts should be packed when leaving the factory. The packaging type can be internal and external packaging according to the specific conditions of the manufacturer. However, parts shall not be damaged or lost due to improper packaging during normal storage and transportation. 3.3 The packaging surface should be marked or labeled with the following contents: a. Manufacturer name;
Component or part name;
Specified mark of component or part:
Quantity of components or parts;
Manufacturing date or production batch number.
8.4 Contents of product certificate:
Manufacturer name:
Component or part name
Manufacturing date or production batch number,
Stamp of technical inspection department.
A, 1 Assembly method of ferrule type pipe joints
GB 3765--88
Appendix A
Assembly and use instructions of ferrule type pipe joints
(reference part)
The performance of ferrule type pipe joints is not only related to the material, manufacturing accuracy, heat treatment, etc. of the parts, but also to the assembly quality. Therefore, this standard stipulates that the assembly should be carried out according to the following method. A.1.1 Cut the pipe on a special machine tool according to the required length, or saw it manually. The perpendicularity between the cut surface and the center line of the pipe shall not exceed half of the outer diameter tolerance of the pipe
A-1.2 Remove the inner and outer burrs, metal chips and dirt from the pipe ends. A.1.$Remove the anti-rust oil and dirt from the parts of the pipe joint. A.1.4 Apply a small amount of lubricating oil to the ferrule blade, thread and contact parts. Put the nut and the ferrule on the pipe in order, then insert the pipe into the bottom of the tapered hole in the joint body and put the stop ferrule. While tightening the nut, turn the pipe until it stops, and then tighten the nut 1 to 11/3 turns.
A,1.5 Mechanical pre-assembly can also be used during assembly, but it should comply with the above regulations. A,2 Instructions for use of ferrule pipe joints
A.2.1 Sealing gaskets are required at the connection between the joint body and the machine end. The type of gasket can be determined by the use conditions. It is recommended to select sealing gaskets according to the provisions of JB982-77 "Honghe Sealing Gaskets" and JB1002-77 "Sealing Gaskets". A.2.2 Carbon steel or stainless steel seamless steel pipes should be used during assembly, and the surface of the steel pipe should be in annealed state. A.2.3 Use of several special types of ferrule pipe joints A.2.3.1 ferrule butt joint: When the pipeline is very short and it is inconvenient to assemble and disassemble, the lower sleeve butt joint can be used (see Figure A1). Figure Al
A.2.3.2-Compression sleeve bulkhead pipe joint: When there are too many pipes, arranged in rows, or the pipe system is connected inside and outside the wall, a compression sleeve bulkhead pipe joint can be used (see Figures A2 and A3). A.2.3.3 Compression sleeve combined pipe joint When the compression sleeve end angle and end two-way pipe joint cannot meet the direction requirements when tightened, the compression sleeve long sleeve combined pipe joint can be used (see Figure A4): GB3765-83
Figure A2 Container internal and external connection
Figure A3 Pipe support frame connection
Salt, angle spectrum connector
GB3765-83
Combination pipe joint
End self-through pipe connection
A.2.3.4 Compression sleeve end straight long pipe joint: When the distance between the two threaded holes is close and the installation is restricted, a sleeve end straight long pipe joint can be used. The head is installed alternately with the straight-through pipe joint. Additional notes:
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Institute of the Ministry of Machinery Industry. This standard is drafted by the Standardization Institute of the Ministry of Machinery Industry, and is drafted by Shenyang Heavy Machinery Plant, Chongqing Heavy Automobile Research Institute, Dalian Combined Machine Tool Research Institute, Zhejiang Haiyan County Pipe Fittings! , Shanghai Electromechanical No. 1 Kitchen Science and Technology Information Institute, and the 708th Institute of the Ministry of Aerospace. The main drafters of this standard are Hu Lusheng, Liu Dequan, Cheng Zhenshi, and Shang Muqin. From the date of implementation of this standard, the original ministry standard JB1989-77 "Technical Conditions for Compression Fittings" will be invalidated.4 Apply a small amount of lubricating oil to the ferrule blade 1, thread and contact parts. Put the nut and ferrule on the pipe in order, then insert the pipe into the bottom of the tapered hole in the joint body and put the stop ferrule. While tightening the nut, turn the pipe until it stops, and then tighten the nut 1 to 11/3 turns.
A,1.5 Mechanical pre-assembly can also be used during assembly, but it should comply with the above regulations. A,2 Instructions for use of ferrule pipe joints
A.2.1 Sealing gaskets are required at the connection between the joint body and the machine end. The type of gasket can be determined by the use conditions. It is recommended to select sealing gaskets according to the provisions of JB982-77 "Red Sealing Gaskets" and JB1002--77 "Sealing Gaskets". A.2.2 Carbon steel or stainless steel seamless steel pipes should be used during assembly, and the surface of the steel pipe should be in an annealed state. A.2.3 Use of several special types of ferrule pipe joints A.2.3.1 Ferrule type butt joint: When the pipeline is very short and it is inconvenient to install and disassemble, the lower sleeve type butt joint can be used (see Figure A1). Figure Al
A.2.3.2-Flange type bulkhead pipe joint: When there are too many pipelines and they are arranged in rows, or the pipeline system is connected inside and outside the bulkhead, the ferrule type bulkhead pipe joint can be used (see Figures A2 and A3). A.2.3.3 Compression sleeve type combined pipe joint When the compression sleeve type end angle and end two-way pipe joint cannot meet the direction requirements when tightened, the compression sleeve type long sleeve combined pipe joint (see Figure A4) can be used: GB3765-83
Figure A2 Container internal and external connection
Figure A3 Pipe support frame connection
Salt, angle spectrum connection
GB3765-83
Combination pipe joint
End self-through pipe connection
A.2.3.4 Compression sleeve type end straight long pipe joint: When the distance between the two threaded holes is close and the installation is restricted, the sleeve type end straight long pipe joint is used. The head is installed alternately with the straight-through pipe joint. Additional notes: www.bzxz.net
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Institute of the Ministry of Machinery Industry. This standard is drafted by the Standardization Institute of the Ministry of Machinery Industry, and is drafted by Shenyang Heavy Machinery Plant, Chongqing Heavy Automobile Research Institute, Dalian Combined Machine Tool Research Institute, Zhejiang Haiyan County Pipe Fittings! , Shanghai Electromechanical No. 1 Kitchen Science and Technology Information Institute, and the 708th Institute of the Ministry of Aerospace. The main drafters of this standard are Hu Lusheng, Liu Dequan, Cheng Zhenshi, and Shang Muqin. From the date of implementation of this standard, the original ministry standard JB1989-77 "Technical Conditions for Compression Fittings" will be invalidated.4 Apply a small amount of lubricating oil to the ferrule blade 1, thread and contact parts. Put the nut and ferrule on the pipe in order, then insert the pipe into the bottom of the tapered hole in the joint body and put the stop ferrule. While tightening the nut, turn the pipe until it stops, and then tighten the nut 1 to 11/3 turns.
A,1.5 Mechanical pre-assembly can also be used during assembly, but it should comply with the above regulations. A,2 Instructions for use of ferrule pipe joints
A.2.1 Sealing gaskets are required at the connection between the joint body and the machine end. The type of gasket can be determined by the use conditions. It is recommended to select sealing gaskets according to the provisions of JB982-77 "Red Sealing Gaskets" and JB1002--77 "Sealing Gaskets". A.2.2 Carbon steel or stainless steel seamless steel pipes should be used during assembly, and the surface of the steel pipe should be in an annealed state. A.2.3 Use of several special types of ferrule pipe joints A.2.3.1 Ferrule type butt joint: When the pipeline is very short and it is inconvenient to install and disassemble, the lower sleeve type butt joint can be used (see Figure A1). Figure Al
A.2.3.2-Flange type bulkhead pipe joint: When there are too many pipelines and they are arranged in rows, or the pipeline system is connected inside and outside the bulkhead, the ferrule type bulkhead pipe joint can be used (see Figures A2 and A3). A.2.3.3 Compression sleeve type combined pipe joint When the compression sleeve type end angle and end two-way pipe joint cannot meet the direction requirements when tightened, the compression sleeve type long sleeve combined pipe joint (see Figure A4) can be used: GB3765-83
Figure A2 Container internal and external connection
Figure A3 Pipe support frame connection
Salt, angle spectrum connection
GB3765-83
Combination pipe joint
End self-through pipe connection
A.2.3.4 Compression sleeve type end straight long pipe joint: When the distance between the two threaded holes is close and the installation is restricted, the sleeve type end straight long pipe joint is used. The head is installed alternately with the straight-through pipe joint. Additional notes:
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Institute of the Ministry of Machinery Industry. This standard is drafted by the Standardization Institute of the Ministry of Machinery Industry, and is drafted by Shenyang Heavy Machinery Plant, Chongqing Heavy Automobile Research Institute, Dalian Combined Machine Tool Research Institute, Zhejiang Haiyan County Pipe Fittings! , Shanghai Electromechanical No. 1 Kitchen Science and Technology Information Institute, and the 708th Institute of the Ministry of Aerospace. The main drafters of this standard are Hu Lusheng, Liu Dequan, Cheng Zhenshi, and Shang Muqin. From the date of implementation of this standard, the original ministry standard JB1989-77 "Technical Conditions for Compression Fittings" will be invalidated.
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