HG/T 21573.1-1995 Bolt Hydraulic Tightening Device Series HG/T21573.1-1995 Standard Download Decompression Password: www.bzxz.net

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| |M80×4
Figure 4.1-3CR and CH hydraulic tensioners
CR and CH hydraulic tensioners series parameters Cylinder cross-sectional area Maximum tensile forcebZxz.net
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
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