Attch 26 - Appendix 14.2 - Guidance and Standards-Backflow Prevention.pdf

2 Feb 2012 Page 1 of 1 Attachment 26 Solicitation FA9401-12-R-0002

GUIDANCE AND STANDARDS-BACKFLOW PREVENTION

3.11 PROTECTION FOR BACKFLOW PREVENTION

A. A backflow prevention assembly shall be installed on all new systems and where shown on the drawings for modifications to systems to prevent cross-connection contamination between potable water systems and any fire sprinkler system. Install the backflow prevention assembly at the service connection for the fire sprinkler system or as noted on the contract drawings.

B. Backflow prevention assemblies shall be either FM approved or UL listed and be approved by the Foundation for Cross-Connection Control and Hydraulic Research, University of Southern California (USC-FCCHR).

C. When a backflow prevention assembly is installed at the base of the riser for the sprinkler system, install a 4” bypass around the fire department connection check valve with a normally closed OS and Y valve (see riser detail) to perform the forward flow test as required by NFPA 13R. Or unless otherwise specified on the contract drawings.

D. Backflow prevention assemblies used or installed under this contract shall be tested by a

"Certified Backflow Control Assembly Tester" who possesses a current (within three (3) years from date of issuance) certificate that confirms successful completion of an approved (USC-FCCCHR or Colorado Environmental Training Center, Golden, Colorado) training course.

E. Backflow prevention assemblies shall be installed in accordance with AWWA Manual

M14 requirements.

F. Backflow prevention devices will be installed outside the building they must be in heated enclosures and with adequate space for inspection, tests and maintenance.

G. Adequate drainage shall be provided for RPBFP and meet the following.

1. Discharge shall be piped full size (of the relief valve) and extended to a drain.

2. Discharge piping shall be sloped 1/8" per foot and be Schedule (10).

3. French Drains are not allowed.

H. The Contractor shall perform an operational test on any new or relocated backflow prevention assemblies used or installed under this contract. Passing backflow preventers shall be labeled with a tag indicating: test performed, tester's initials and date. Testing documentation shall be submitted to contracting officer.

I. Repairs to backflow prevention assemblies shall be made with original manufacturer's parts.