Difference Between Rigid Vs Flexible grooved pipe Coupling

Mar. 23, 2023

Difference Between Rigid Vs Flexible grooved pipe Coupling


There are many types of grooved pipe fittings, including rigid couplings and flexible couplings for pipes, open-hole mechanical tees, crosses and grooved tees, crosses, single-piece flanges and grooved flanges, etc., which have similar functions, but the usage occasions are different. Before installation, you should have an in-depth understanding of the performance and service conditions of various couplings and accessories, so that you can choose them correctly. The most important of these is to distinguish the difference between a flexible joint and a flexible joint.


In engineering construction, due to insufficient technical disclosure and quality monitoring, workers often do not distinguish between rigid couplings and flexible couplings, and use them at will, which brings hidden dangers to the reliable operation and normal maintenance of the entire pipeline system.


For example: in the domestic hot water system, the temperature difference between the system operating temperature and the pipe installation temperature can reach 60°C, and the steel pipe is 6m long, and the resulting thermal expansion stress will reach 1200kg/mm2. If the pipe is rigidly connected, it will cause deformation of the bracket and cause damage to the pipe system. Therefore, the butt joint fittings should be distinguished and selected reasonably.



The following typical situations reveal the difference between rigid and flexible couplings:


1. Domestic hot water pipes, air-conditioning water pipes, and open-air pipes, in order to effectively compensate for the pipe displacement caused by thermal expansion and contraction, the above three types must use flexible couplings. If the displacement of the telescopic section exceeds the total compensation amount of the flexible couplings, should also consider installing metal expansion couplings.


2. Pipes with little change in temperature difference, such as indoor fire-fighting pipes, can use a large number of rigid couplings. However, a certain number of flexible couplings should be installed in the middle section of the long straight pipeline to compensate for a small amount of thermal expansion of the long straight pipeline section to ensure that the entire pipeline system is in a safe operating state.



3. For bent pipes and zigzag pipes with temperature compensation function, flexible couplings shall be installed on the pipe sections where angular displacement occurs.


4. It is recommended to use flexible couplings for pump room pipelines to reduce noise and weaken vibration transmission.



5. Flexible couplings should be used for buried pipelines, which can effectively deal with local deformation of the pipeline system caused by uneven settlement.


6. Flexible pipe couplings must be used for the connection of small arc pipes. It can be assembled according to the straight pipe first, and then bend the pipe to make it reach the predetermined corner. But under no circumstances should the angle of rotation exceed the value specified in the instructions for grooved pipe fittings.



You can click the link below to watch more exciting videos about grooved pipe fittings.



Contact Us

E-mail: sales1@jianzhi-fitting.com

Tel: +86 022 8848 8866

Office In Tianjin:

Heping District, Tianjin, China.

Production Base 1:

Chifeng, Inner Mongolia, China.

Production Base 2:

Tangshan City, Hebei Province, China.

Jianzhi International Trade (Tianjin) Co., Ltd.

Copyright ©Hebei Jianzhi Casting Group Co., Ltd. All Rights Reserved | Sitemap

SeoKeywords: Galvanized Pipe Fittings Supplier galvanized pipe fittings manufacturers cheap galvanized pipe fittings galvanized pipe fittings wholesale galvanized pipe fittings Saudi Arabia galvanized pipe fittings canada 1/2 inch galvanized pipe fittings 3 4 galvanized pipe fittings galvanized pipe fittings for sale galvanized pipe fittings price list galvanized pipe fittings size gi pipe fittings price list philippines bulk black pipe fittings black pipe fittings wholesale grooved fittings for fire fighting system grooved pipe fitting Wholesale grooved fittings manufacturer black pipe reducer iron pipe bend galvanized elbow gi elbow price black iron elbows grooved elbow 4 inch 6 inch fm ul ductile iron grooved fittings union for fire protection wholesale ductile iron grooved pipe fitting union for fire fighting epoxy coat ductile iron grooved fittings and mechanical tee for fire fighting pipe fitting manufacturer and supplier china malleable iron pipe fittings suppliers china black pipe tee factory