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Michaud's formula

Input data

Initial head on the valve (H)

Length

Average velocity in permanent regime

Celerity

Time to close the valve

Output data

Maximum transient head at the valve

Minimum transient head at the valve

Maximum transient head at midway

Minimum transient head at midway

Description

Given the basic characteristics of a pressurized gravity conduction line (extension, celerity), permanent regime (water velocity) and valve (closure time, assumed linear), estimates the extreme transient heads that will occur at the valve and at midway.

This method is applied to closing valve time equal or superior to $10\cdot \frac{L}{a}$, with $L$ been the extension and $a$ is the celerity.

pressurized gravity conduction linepressurized gravity conduction line

References

  • VIANNA, Marcos R. Golpe de aríete em adutora - edição eletrônica. Belo Horizonte: Bloom, 2021.