CB/Z 174-1980 Technical conditions for configuration and installation of submarine shock absorber pipes CB/Z174-1980 Standard download decompression password: www.bzxz.net

Guiding Technical Documents of the Sixth Ministry of Machinery Industry of the People's Republic of China
Technical Conditions for Configuration and Installation of Submarine Shock Absorption Pipes CB/Z174-80
This standard applies to Gu and GuT type shock absorption rubber pipes (CB798-79), pressure balanced shock absorption rubber pipes (Figure 1), unbalanced shock absorption rubber pipes (Figure 2) and metal bellows listed in the appendix (Figure 3). 1. Requirements for configuration of shock absorption pipes
1. All pipelines connected to shock absorption machinery must be equipped with shock absorption pipes. For pipes below Dg10, the pipe itself can be used to make compensation rings instead of shock absorption pipes. For pipes below Dg32 and above Pg10, hoses equivalent to the actual pressure of the pipe can also be used. For pipes below Pg6, cloth-reinforced rubber hoses can be used. 2. Reasonable selection of shock absorption pipes:
(1) The nominal pressure of the selected shock absorption pipe must be greater than or equal to the maximum working pressure of the pipeline. (2) Select the corresponding shock absorption pipe according to the flow medium of the pipeline. (3) When the medium temperature exceeds 70℃ and is lower than 130℃, a medium-temperature shock-absorbing pipe should be used; when the temperature exceeds 130℃, a metal bellows should be used.
(4) When using GT type rubber pipe, a suitable limiter should be selected. If the pressure is not high and the deformation of the shock-absorbing pipe does not exceed the specified value, the limiter can be omitted. (5) When using metal bellows, when the working pressure is greater than 10kgf/cm2 and the diameter is greater than or equal to 65mm, it should be installed as a bay pipe balance type as much as possible (Figure 4).
3. The layout of the shock-absorbing pipe should be as close to the shock-absorbing machine as possible. Generally, the shock-absorbing pipe is required to be directly connected to the inlet and outlet flanges of the system to which the shock-absorbing machine belongs. If it cannot be reached, a metal pipe section as short as possible can be inserted between the machine and the pipe. 4. The pipeline behind the shock-absorbing pipe must be fixed to the hull structure with a bracket with sufficient rigidity. 5. The shock-absorbing pipe should not bear the healing of the pipeline and pipeline accessories. 6. The pipeline equipped with the shock-absorbing pipe should be as straight as possible. If there is a bend, the transition should be smooth, and the bending radius should not be less than 1.5 times the pipe diameter. At the same time, try to avoid using angled valves behind the shock-absorbing pipe, because angled valves are additional noise sources for the pipeline.
7. The layout of the shock-absorbing pipe must be convenient for maintenance and should be replaced when the shock-absorbing pipe is damaged. 8. The distance between the shock-absorbing pipe installed on the pipeline and the adjacent pipeline or equipment is generally not less than 30mm. II. Requirements for the installation of shock-absorbing pipes
9. The shock-absorbing pipe should have a certificate of conformity and can only be installed within the specified validity period. 10. The shock-absorbing pipe should be carefully inspected before installation. If cracks, delamination or other mechanical damage defects are found between the rubber and the metal of the shock-absorbing pipe, the pipe shall not be installed.
Issued by the Sixth Ministry of Machinery Industry
Proposed by the Submarine Professional Group
May 13, 198
Drafted by the 719th Institute
Total 4 pages Page 2
CB/Z174-80
11. In order to avoid damage to the rubber block and separation of the metal flange surface, it is not allowed to peel off the rubber protective film from the sealing surface of the flange end face. 12. Between the reducer and the pipeline flange, a sealing gasket suitable for the flow medium, pressure and degree conditions should be installed. 13. The flow direction of the medium marked on the metal bellows flange should be consistent with the actual flow direction of the pipeline medium. 14. The manufacturing date on the rubber shock-absorbing pipe should be facing the side that is easy to observe during installation. 15. The reducer and flange are connected with bolts or studs. In the case of using a limiter, the end of the rubber metal half ring where the limiter is installed can only be connected with bolts. Spring washers or stop washers should be installed under all bolts or nuts. 16. When installing the damping pipe, when the bolt holes of the damping pipe flange do not overlap with the bolt holes of the pipeline flange in a free state, it is strictly forbidden to use the forced installation method to avoid the damping pipe from twisting. 17. When installing the damping pipe, the damping pipe should be subjected to compression deformation as much as possible. When there is no working pressure in the pipeline, the installation deformation value of the damping pipe should not exceed the following values ​​(relative to the actual size): tensile deformation is not greater than
compression deformation is not greater than
lateral displacement deformation is not greater than
deflection (the difference between the maximum and minimum distances between the two flanges of the damping pipe) is not greater than 2mm. When the installation deformation exceeds this specified value, measures should be taken to adjust it and make it reach the allowable value. The installation deformation value must be inspected and accepted by the inspection department of the shipbuilding factory.
18. For the damping pipe with a limiter, install and adjust the limiter after checking the installation deformation. For the pressure-balanced rubber damping pipe and the elbow-balanced metal bellows, the balance bolts also need to be adjusted. , 19. After the limiter and the balance bolt are adjusted, the pipeline tightness test is carried out. 20. The rigid fixing bracket on the pipeline should ensure that the deformation value of the shock-absorbing pipe under the maximum working pressure (for the metal bellows installed on the steam pipeline, the deformation value during the pressure holding test should be guaranteed) does not exceed the following values ​​(relative to the actual size) Axial tensile or compression deformation is not more than 2mm. Deflection is not more than 3mm.
When the deformation value exceeds this specified value, measures should be taken to meet this requirement. This deformation value is inspected by the shipbuilding factory inspection department. 21. Painting on the replacement colloid is not allowed. III. Inspection and acceptance of shock-absorbing pipe installation
22. Check the installation quality of the shock-absorbing pipe according to the pipeline installation drawing and this technical condition. Any discrepancy with the pipeline installation drawing and the requirements of this technical condition should be reinstalled.
23. According to the requirements of Article 17, check the installation deformation value of the shock-absorbing pipe when there is no pressure in the pipeline. 24. According to the requirements of Article 20, check the deformation value of the shock-absorbing pipe under the maximum working pressure of the pipeline, and the deformation value of the metal bellows during the insulation and pressure test.
25. During the mooring test, the sound insulation quality of all shock-absorbing pipes should be checked. The inspection is carried out under the normal use of the machine. For rubber shock-absorbing pipes, the vibration acceleration level difference shall not be less than 10 decibels. For metal bellows, it shall not be less than 8 decibels. While checking the sound insulation of the shock-absorbing pipe, the amplitude of one flange of the shock-absorbing pipe relative to the other flange should also be checked. The amplitude should not be greater than 0.3mm.
If the conditions are not met, this article may not be used as the basis for acceptance. Appendix
Attached Figure 1
CB/Z174-80
Pressure balanced rubber shock-absorbing pipe
Attached Figure 2
Unbalanced rubber shock-absorbing pipe
Total 3 pages
Total 4 pages Page 4
Attached Figure 3
CB/Z174—80wwW.bzxz.Net
Metal bellows
Attached Figure 4 Bend balanced metal bellows
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