HG/T 21573.1-1995 Bolt Hydraulic Tightening Device Series HG/T21573.1-1995 Standard Download Decompression Password: www.bzxz.net
Some standard content:
Hydraulic tightening device series for bolts HG/T21573.1—95 Subject content and scope of application This standard is a series of tools for tightening bolts by hydraulic method, which is applicable to tightening large diameter bolts of M48~M140 on pressure vessels in petrochemical industry and other industries. When used for pressure vessels, the sealing type is metal flat gasket, toothed combination gasket, double cone gasket If the sealing gasket is other than the above type or the use occasion is different, the bolt tightening force should be determined through test verification, and the capacity of the hydraulic tightening device should be checked. This standard can also be applied to the tightening of bolts of other mechanical equipment. Determined. HG/T21573.2 HG/T21573.3 HG/T21573.4 Reference standards 《Steel pressure vessel》 《Steel shell and tube heat exchanger》 《Strength calculation regulations for steel chemical containers》 《Large diameter stud》 《Large diameter nut》 《Spherical washer》 The sealing of metal flat gaskets and double cone gaskets shall comply with the provisions of GB150, and the sealing of toothed combination gaskets shall comply with the regulations of HGJ16. Composition and working principle 3.1 Composition The bolt hydraulic tightening device consists of three parts: high-pressure oil pump, hydraulic transmission hose and hydraulic tensioner. The number of instruments used in this series is usually: 1 manual high-pressure oil pump: 4 hydraulic transmission high-pressure hoses: 4 hydraulic tensioners. The combination diagram of the bolt hydraulic tightening device is shown in Figure 3.1. If the number of hydraulic tensioners is equal to the number of bolts to be tightened, the tightening procedure can be simplified. 3.2 Working principle The bolt hydraulic tightening device is a device that generates oil pressure from a high-pressure oil pump and is transmitted to the piston surface of the hydraulic tensioner by a hydraulic transmission hose. The bolt is stretched by the locking nut on the hydraulic tensioner and the bolt to be tightened. Then the round rod is turned to tighten the nut of the container. After the pressure is released, the purpose of tightening the bolt is achieved. The tightening process will be carried out according to the prescribed procedures under different oil pressures, see Appendix B. Type and specification 4.1 Type 4.1.1 According to the structure of the locking nut on the upper part of the hydraulic tensioner and the shape of the connecting nut used in the design of the pressure vessel, this standard series includes six types of hydraulic tensioners. That is, AR, AH, BR, BH, CR, and CH. The AR type hydraulic tensioner uses an extended locking nut, which is matched with the R type connecting nut. AH hydraulic tensioner adopts an extended locking nut, which is used with HI or HR connection nuts. BR hydraulic tensioner adopts an extended locking nut, which is used with R connection nuts. BH hydraulic tensioner adopts an extended locking nut, which is used with HI or HR connection nuts. CR hydraulic tensioner uses an extended locking nut with a transition connection screw, which is used with R connection nuts. CH hydraulic tensioner adopts an extended locking nut with a transition connection screw, which is used with HI or HR connection nuts. The structural types of AR and AH hydraulic tensioners are shown in Figure 4.1-1. The structural types of BR and BH hydraulic tensioners are shown in Figure 4.1-2. The structural types of CR and CH hydraulic tensioners are shown in Figure 4.13. The four types of hydraulic tensioners, AR, AH, BR, and BH, are suitable for newly designed pressure vessels. CR and CH hydraulic tensioners are usually used when the original high-pressure container connection bolts are required to be changed to hydraulic tightening. 4.2 Specifications 4.2.1 The specifications of the hydraulic tensioner are determined according to the diameter of the tensioned bolts and are expressed by the thread diameter of the bolts. There are 16 specifications of each type of hydraulic tensioner in this standard series, which are divided into five groups. Among them, 48.52, 56.64 are a group; 72, 80, 85, 90 are a group; 100.105, 110 are a group; 115, 120, 125 are a group, and 130, 140 are a group. The structural dimensions and basic parameters of the tensioners in the same group are the same, only the diameter of the locking nut is different. The structural dimensions and basic parameters of AR and AH hydraulic tensioners are shown in Table 4.2-1. The structural dimensions and basic parameters of BR and BH hydraulic tensioners are shown in Table 4.2-2. The structural dimensions and basic parameters of CR and CH hydraulic tensioners are shown in Table 4.2-3. Note: The maximum tensile force values of various models and specifications of hydraulic tensioners listed in Table 4.2-1 to Table 4.2-3 are applicable to metal flat gaskets, toothed combination gaskets, and double-cone gasket seals for tightening stud bolts. Various specifications above model 80 (including 85) are usually only applicable to double-cone gasket seals. 5 Bolt specifications M48×4 M52X×4 M80×4 M90×4 M100×4 M105×4 M110X4 M115×4 M120X4 M125×4 M130X4 AR type and AH type Hydraulic tensioner AR and AH hydraulic tensioner series parameters Cylinder cross-sectional area, A Maximum tension force M140X4 M48X×4 M52×4 M56×4 M85×4 M100X4 M105×4 M110X4 M115×4 M12 0×4 M125×4 M130X4 M140X4 Adjacent bolt centers Minimum spacing, mm Bolt specifications M56×4 M90×4 M100×4 M105×4 M110×4 M115X4 M12 0×4 M125×4 M130X4 M140X4 M52×4 M56×4 M64×4 M85×4 M100×4 M105×4 M110×4||t t||M115×4 M120X4 M125 ×4 M130X4 M140X4 Figure 4.1-2 BR and BH hydraulic tensioners BR and BH hydraulic tensioner series parameters Cylinder cross-sectional area. A Maximum tension force Table 4.2-2 Adjacent bolt centers Minimum spacing, mm Bolt specifications M72×4 M85×4 M90×4 M100X4 M105×4 M110X4 M115×4 M120X4 M125X4 M130X4 M140X4 M100x4||tt ||M105×4 M110×4 M115 ×4 | 4 M56×4 M80×4||tt| |M80×4www.bzxz.net Figure 4.1-3CR and CH hydraulic tensioners CR and CH hydraulic tensioners series parameters Cylinder cross-sectional area Maximum tensile force Table 4.2--3 Adjacent bolt centers Minimum spacing, mm 5 Technical requirements 5.0.1 The materials used to manufacture high-pressure oil pumps and hydraulic tensioners shall comply with the corresponding national standards or professional standards. 5.0.2 The hydraulic oil used is YB-N46, which shall comply with the provisions of GB2512. 5.0.3 The rated maximum working pressure of the high-pressure oil pump is 150MPa; the maximum allowable tensile force of the hydraulic tensioner is specified in Table 4.2-1~Table 4.2-3; the rated maximum working pressure of the hydraulic transmission hose is 130MPa, but it should be at least 1.2 times the required oil pressure. Hydraulic tensioner standard number 6 Marking 6.1 Marking method Hydraulic tensioner Hydraulic tensioner type 6.2 Marking examples Thread diameter of the stretched bolt Example 1: Tighten the M64×4 stud with a hydraulic tensioner, the nut is round, and the hydraulic tensioner uses an extended locking nut. 5 Hydraulic tensioner AR64 Marking: HG/T21573.1-95 Example 2: Tighten the M105×4 stud with a hydraulic tensioner, the nut is a hexagonal or hexagonal round combined nut with a hole, and the hydraulic tensioner uses an extended locking nut. Marking: HG/T21573.1-95 Hydraulic tensioner BH10510 Marking, packaging and transportation The model should be clearly marked with a steel stamp on the hydraulic tensioner. Manual high-pressure oil pumps, hydraulic transmission hoses, hydraulic tensioners and necessary spare parts should be packed in portable wooden boxes, and the wooden boxes should clearly indicate the product name and transportation precautions or markings. 11 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.