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Why does a water hammer is more particularly present in the bigger pipes rather than the smaller pipes?

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Question ajoutée par Tom Escosa , HVAC Engineer , ADNOC
Date de publication: 2013/10/18
Sherif Mohammed Ibrahim
par Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

the factor affecting water hammer is the change in velocity 

and according to the flow equation 

Q = v*a

then the bigger pipes always has low velocities flow

so the change in velocity will be very haigh

change in pressure = density * wave propagation velocity * change of velocity

ASIF BE Mech IEng PMP
par ASIF BE Mech IEng PMP , Projects Manager - Buildings Utilities & infrastructure , Qatar General Electricity & Water Corporation

water hammering is due to vortex formation and air pocket rsidual resistance ,the larger the dia self dampening effect (difficult to maintain full pipe flow) is more so hammering of pressure waves between air and water is heavy specially at bends ,valve chambers change of size etc that's why we use air-release and excess pressure release valves in water transmission

Utilisateur supprimé
par Utilisateur supprimé

They are not usually smaller - some amateur plumbed yours.

MD IMRAN
par MD IMRAN , QC INSPECTOR , MTQ OILFIELD SERVICES

i think its because of more volume of the liquid.

more volume of liquid = more force=more pressure more water hammering

ismail shaikh
par ismail shaikh , hvac technician , dubai health authority

more pressure or more force

Ahmed Gahlan
par Ahmed Gahlan , Senior Technical Engineer , Saudi Binladin Group. (Public Buildings & Airports Division)

In addition to what my fellow engineers stated above, Water hammer is related to pressure fluctuation (either because of velocity changes or sudden demand change , pressure fluctuations are more likely to happen in bigger systems specially at the time of peak demand than in smaller systems.

Georgio Rizk
par Georgio Rizk , Mechanical Infrastructure Engineer / Expert Hydraulic Analyst , Dar Al Handasah - Shair & Partners

Because usually higher water velocities are accepted for large pipes in order to reduce the capital cost of piping. This implies that the surge effect will be greater.

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