HG/T 20550-1993 Spherical compensator configuration design regulations HG/T20550-1993 standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
20550-93
Spherical Compensator Configuration Design Provisions
1993-06-17
1993-11-01
Ministry of Chemical Industry of the People's Republic of China
ww.bzsos.com Implementation
Industry Standard of the People's Republic of China
Spherical Compensator Configuration Design Provisions
HG 20550-93
Editor: Fourth Design Institute of Ministry of Chemical Industry
Approving Department: Ministry of Chemical Industry
Implementation Date: November 1, 1993
Editorial Center of Engineering Construction Standards of Ministry of Chemical Industry
1 General Provisions
1.2 Conditions of Use
1.3 Occasions of Use
2 Arrangement of Ball Supplements
2.1 Arrangement of Ball Supplements
2.2 Matters needing attention when arranging ball compensation
2.3 Connection between main pipe and branch pipe
Calculation of ball center distance
3.1 Original data
3.2 Relationship between bending angle 6, compensation amount A and ball center distance 4 Setting of bracket
Thrust calculation of fixed pipe rack
Main components of thrust of fixed pipe rack
5.2 Total thrust F acting on fixed pipe rack5.3 Calculation example of typical pipe rack||tt| |Appendix A
Appendix B
Specifications and installation dimensions of spherical compensators
Local resistance coefficient
Preparation instructions
(3)
1 General
1.1 Overview
1.1.1 These regulations are formulated for the selection and arrangement of spherical compensators (hereinafter referred to as spherical compensators) in pipeline design. If the design exceeds the scope of these regulations, the engineering design personnel shall make supplementary regulations.
1.1.2 The spherical compensator is a compensating device for absorbing large displacements in pipelines. It has the characteristics of large compensation capacity, small space occupation, small deformation stress, small local resistance, and small steel consumption. 1.1.3 In addition to rotating at any angle along the axis, the spherical compensator itself can also be bent in any direction, and its bending angle is not greater than 30°
1.1.4 The spherical compensator must be used in a group of two or three and cannot be used as a single spherical compensator.
1.2 Conditions of use
1.2.1 Design parameters of ball patch pipes are as follows: design pressure PN≤1.6MPa;
design temperature T≤350℃;
nominal diameter DN50mm~600mm.
1.2.2 Ball patch is suitable for pipelines with non-flammable and non-toxic thermal fluid media, such as steam, hot water, condensate, hot oil and hot air, and shall not be used on pipelines with corrosive thermal media.
Occasions of use
Ball patch is most suitable for use on thermal pipelines for long-distance transmission between factories and regions.
Thermal pipelines with large deformation and displacement after thermal expansion but limited spatial position.
Pipes that require pressure drop and flow rate to be as small as possible due to process operating conditions or from an economic point of view.
1.3.4 Inlet and outlet pipelines of sensitive equipment with certain restrictions on pipe load. 1.3.5 Locations between buildings (structures) where there is a possibility of stress overload accidents on pipelines due to uneven foundation settlement or earthquakes. The comprehensive engineering cost of pipelines using ball compensation should be lower than that of pipelines using other compensation methods 1.3.6wwW.bzxz.Net
Arrangement of ball compensation
2.1Arrangement of ball compensation
2.1.1 Straight pipe sections can best give full play to the characteristics of large compensation capacity of ball compensation. According to the pipe specifications and the rigidity of the pipe, the distance between the fixed brackets at both ends of the pipeline can be set to 300m~700m, and a group of ball compensation can be arranged. The installation method can be horizontal or vertical.
2.1.2 When the pipeline is arranged in a Z shape, as shown in Figures 2.1.2-1 and 2.1.2-2. B
Fixed bracket
Sliding bracket
Guiding bracket
Figure 2.1.2-1
Figure 2.1.2-2
If conditions permit, Figure 2.1.2-2 should be recommended. Since the value of the flexion angle ? of this type is doubled, the ball center distance R can be shortened, giving full play to the compensation capacity of the ball compensation. This type is suitable for when the ball compensation is set between two fixed brackets, biased to one side, close to one end of the fixed bracket, and far away from the other end.
For the two-way arrangement, please see Figure 2.1.2-3: B
Sliding bracket
Fixed bracket
Guiding bracket
Figure 2.1.2-3
The two-way arrangement is suitable for the ball compensation to be set between two fixed points, in a relatively moderate position, and try to make the length of the pipeline section A close to the length of the pipeline section B or the distance equal. 2.1.3 The square four-ball complement arrangement is shown in Figures 2.1.3-1 to 2.1.3-3. This arrangement is suitable for long-distance straight pipelines and can be arranged horizontally or vertically.
Platform support
Sliding support
Fixed support
Guide support
Figure 2.1.3-1 Horizontal arrangement
Fixed support
Sliding support
Elastic support
Guide support
Across center line
Figure 2.1. 3-2
Pipe pier or low support
Vertical arrangement
Figure 2.1.3-3 Vertical downward arrangement
2.1.4 Three-ball compensation arrangement As shown in Figures 2.1.4-1~2.1.4-2, it is suitable for L-shaped or B-shaped arrangement. The pipeline should not have lateral displacement in the axial direction or a small amount of lateral displacement is allowed. The third ball compensation is used to absorb the thermal expansion of the pipeline in two directions. Figure 2.1.4-1
Z-shaped arrangement
Guide bracket
Sliding bracket
Figure 2.1.4-2L-shaped arrangement
Matters to be noted when arranging ball compensation
Fixed bracket
When multiple pipelines are arranged in the same section, the arrangement of pipelines should be fully considered to prevent adjacent pipelines from colliding or squeezing each other due to thermal expansion of pipelines, especially large displacement near ball compensation.
2.2.2 Ball compensation should be set near the elbow of the pipeline as much as possible to increase its compensation amount. 2.2.3When arranging ball compensation horizontally, due to the large deadweight of the ball compensation, a platform should be considered. At the contact point between the ball patch and the platform, a trolley with four sliding wheels should be considered to be set up, which can move back and forth with the ball patch to make the movement of the ball patch more flexible and reliable, see Figure 2.2.3.6
Sliding trolley
2.3 Connection between main pipe and branch pipe
2.3.1 When connecting the main pipe and the branch pipe, when only the expansion of the main pipe is considered without considering the expansion of the branch pipe, the minimum size of the short pipe × is shown in Figure 2.3.1-1; when considering the expansion of the main pipe and the branch pipe at the same time, the minimum size of the short pipe × is shown in Figure 2.3.1-2. The setting and layout of the branch pipe ball patch shall still be designed according to the arrangement of the ball patch in 2.1. Do
In the formula:
Figure 2.3.1-1
Determination of the minimum short pipe length of the branch pipe:
The short pipe length of a branch pipe;
-The wall thickness of the pipe;
-Displacement:
D--Diameter,
·E--Elastic modulus;
α--Allowable stress.
Figure 2.3.1-2
Displacement y (see Figure 2.1.2-1.2.1.2-2) Calculation 2.3.3
When △Rsin
: yRR
When A-2Rsin
3Calculation of the distance between the spheres
Original data
Outdoor temperature is the average temperature of the coldest month of the year. The indoor temperature or underground installation is 10℃. The medium temperature is the highest accident temperature, which is usually about 30% higher than the design temperature.
Bending angle ≤30°.
3.2 Bending angle 8. Relationship between compensation △ and spherical center distance When using Figure 2.1.2-1: △-Rsin
When using Figure 2.1.2-2: △=2Rsin
For the convenience of calculation and use, the formula △-2Rsin is used (compensation △ and spherical center distance R, unit m). w.b2
is used as the basis, as shown in Table 3.2
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