I. What is the function of a thrust block?
In pipeline installation, thrust blocks are mainly used to secure elbows and prevent displacement caused by water flow impact or pipeline vibration. For socket and spigot cast iron elbows, the need for a thrust block depends on the elbow angle, size, and installation environment. 22° and 45° elbows have smaller angles and more evenly distributed forces, so they are generally more stable than 90° elbows.
II. Thrust block requirements for 22° and 45° elbows
- 22° elbows: Under normal conditions, thrust blocks are usually not required due to the small angle and low water impact force. However, for large-diameter pipelines of DN100 and above, installing a thrust block is recommended to improve stability.
- 45° elbows: These experience slightly greater forces than 22° elbows. Thrust blocks effectively prevent pipeline displacement, especially in high-pressure or vibrating environments. For 45° elbows smaller than DN100, the use of thrust blocks can be determined flexibly based on actual conditions.
III. Special considerations for DN100 elbows
DN100 is considered a large diameter with stronger water impact forces. Installing a thrust block is recommended for both 22° and 45° DN100 elbows. Particularly in long-distance pipelines or systems with frequent start-stop operation, thrust blocks significantly enhance overall pipeline stability and reduce the risk of leakage.
