Maximum allowable velocity in public water mains???
Maximum allowable velocity in public water mains???
(OP)
I have a site with a several fire hydrants and a 50,000sf building on site and the client is requiring that the maximum allowable velocity in the site water lines be kept at 10fps or less. Is this typical practice to use this as a limit for on site fire and water lines?





RE: Maximum allowable velocity in public water mains???
The maximum velocity might be increased (if allowed by your project specs) over short lengths of pipe, near pumps or other equipment, as long as the pressure drop is tolerable.
One caution. Approaching or exceeding 10 fps may increase the likelyhood of hydraulic surges.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Maximum allowable velocity in public water mains???
Try:www.usac
For normal liquid service applications, the acceptable ft velocity in pipes is 2.1 ± 0.9 m/s (7 ± 3 ft/s) with a maximum velocity limited to 2.1 m/s (7 ft/s) at piping discharge points including pump suction lines and drains. As stated, this velocity range is considered reasonable for normal applications. However, other limiting criteria
such as potential for erosion or pressure transient
conditions may overrule. In addition, other applications
may allow greater velocities based on general industry
practices; e.g., boiler feed water and petroleum liquids.
RE: Maximum allowable velocity in public water mains???
RE: Maximum allowable velocity in public water mains???
"8.1.6 Maximum Velocity:
The DOH recommends that the design of distribution mains not exceed a maximum velocity of eight (8) feet per second (fps) under PHD conditions, unless otherwise specified by the pipe manufacturer. Maximum velocities of greater than eight fps may occur under fire flow conditions, for short sections of mains, or for piping within pump and valve station facilities. Long sections of mains with higher velocities should be checked for transient (water hammer) conditions. Refer to Section 8.1.8 for discussion on surge control and Section 8.2.4 for modeling transient conditions." -http:
RE: Maximum allowable velocity in public water mains???
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Maximum allowable velocity in public water mains???
ht