City of Frisco Engineering Standards

Engineering Standards
3. PVC water mains 16” in diameter and greater shall be AWWA C905 DR18.
B. Ductile Iron Pipe
Ductile iron water mains 16” in diameter and larger shall be in accordance with ANSI/AWWA
C151/A21.50 with a minimum pressure class of 150 psi. It shall be the Engineer’s responsibility
to determine whether a higher pressure class is required.
C. Fittings
All fittings shall be ductile iron and have mechanical restraints and thrust blocking.
5.1.7 Water Services
Minimum requirements for water services are as follows:
A. Minimum 1” meter and 1” services are required for all residential and commercial services. The
size necessary shall be selected based on design calculations of actual demands.
B. Twin meters in parallel are not permitted as meter size shall correlate to the line size. Bullhead
connections are not permitted.
C. Meters 3” and larger are required to be in a concrete vault.
D. Domestic or irrigation service connections shall not be allowed on a fire hydrant lead or fire
service line.
E. A domestic or irrigation service connection shall not exceed 50’ in length.
F. A fire service line shall be a minimum of 8”.
G. The water meter size shall be the same size as the service line.
H. For a water service requiring a vault, a minimum 6” water line shall be required off the water
main with a minimum 6” gate valve prior to reducing in size.
I. Meter boxes shall be placed within the right-of-way or in a dedicated water easement.
J. Meter boxes shall be protected from vehicular traffic with bollards. If not protected by bollards,
either a traffic-rated vault or curb is required.
K. Meters shall be placed generally in the center of residential lots according to the Standard Details.
L. Refer to Approved Material List for acceptable products.
5.1.8 Valves
A. Isolation Valves
1. Isolation valves shall be placed on or near street property lines.
2. Isolation valves shall not be over 600’ apart in residential and multi-family areas.
Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-5