What negative effect may occur on a service due to a water meter?

What negative effect may occur on a service due to a water meter?

• A. Pressure drop
• B. Head loss
• C. Flow reversal
• D. Thermal expansion

Answer: (B)

A water meter introduces a restriction in the service line, which causes friction losses as water passes through it. This energy loss across the meter is called head loss, and it shows up as a reduction in pressure downstream. When demand is higher, the meter’s restriction causes a larger head loss, so the available pressure at downstream fixtures drops. That’s the negative effect the meter can have on a service. Flow reversal isn’t caused by this situation in normal service conditions, and thermal expansion relates to temperature-induced volume changes in a closed system, not to the meter’s flow restriction.

A water meter introduces a restriction in the service line, which causes friction losses as water passes through it. This energy loss across the meter is called head loss, and it shows up as a reduction in pressure downstream. When demand is higher, the meter’s restriction causes a larger head loss, so the available pressure at downstream fixtures drops. That’s the negative effect the meter can have on a service.

Flow reversal isn’t caused by this situation in normal service conditions, and thermal expansion relates to temperature-induced volume changes in a closed system, not to the meter’s flow restriction.