What is a water main thrust block?
Thrust blocks are concrete pipe thrust restraints or anchors placed up against underground pipe fittings to prevent movement of underground pipes from thrust forces in water mains. These restraints were originally developed for use with ductile iron water mains.
Where are thrust blocks needed?
In effect, thrust blocks transfer the load from the pipe to a wider load-bearing surface. Thrust blocks are required where fittings are used to change the direction (i.e., at ties, elbows, wyes, caps, valves, hydrants, and reducers) of buried piping systems.
What is thrust block in pipe line?
A thrust block is a concrete pipe restraint that prevents the mainline from moving by transferring pipe loads (mainly due to pressure thrust) to a wider load-bearing surface. Usually, thrust blocks are provided for buried pipelines at fittings requiring branching or direction change.
What is meant by thrust block?
A thrust block, also known as a thrust box, is a specialised form of thrust bearing used in ships, to resist the thrust of the propeller shaft and transmit it to the hull.
Why thrust block is required?
Thrust blocking prevents main line from moving when the pressure load is applied. Thrust blocks are required where fittings are used to change the direction (i.e., at all ties, elbows, wyes, caps, valves, hydrants and reducers) of the pipeline.
Why do we need thrust blocks?
A thrust block prevents separation of joints and pipe movement by transferring the resultant thrust force at a bend to the undisturbed soil behind the thrust block. The bearing strength of the soil is expressed in pounds per square foot.
Why do you need thrust blocks?
Are thrust blocks required for HDPE pipe?
29 Are thrust blocks required with HDPE pipelines? No. HDPE pipe and fittings joined by heat fusion are self-restrained in all applications, and therefore do not require thrust blocks, provided the entire system is fused. Thrust blocks may be required in cases where special gasketed mechanical fittings are used.
What are thrust blocks used for?
How does thrust block work?
Thrust blocks: The main thrust block transfers forward or astern propeller thrust to the hull and limits axial movement of the shaft. A larger than necessary clearance will not cause harm to the thrust bearing pads, but axial movement of the shaft must be limited for the protection of main machinery.
What is thrust block in irrigation?
Thrust blocking prevents main line from moving when the pressure load is applied. In efect, the thrust block transfers the load from the pipe to a wider load bearing surface.
Why are thrust blocks used?
When are thrust blocks required?
Thrust blocking prevents main line from moving when the pressure load is applied. In efect, the thrust block transfers the load from the pipe to a wider load bearing surface. Thrust blocks are required where fittings are used to change the direction (i.e., at all ties, elbows, wyes, caps, valves, hydrants and reducers) of the pipeline.
What is a thrust block design?
Design of thrust blocks consists of determining the appropriate bearing area of the block for a particular set of conditions. The parameters involved in the design include pipe size, design pressure, angle of the bend (or configuration of the fitting involved), and the horizontal bearing strength of the soil.
What is a concrete thrust block?
Most commonly found in drainage applications, a thrust block is a concrete pipe restraint. The block is utilized to prevent pipe joints separating under the force of carried fluids traversing a bend or tee junction.