Laserfiche WebLink
extension to an exiting network (distribution piping, sprinkler heads control valves, <br /> etc. are added to or replaced in an existing system), or where an additional fire <br /> protection system (new feed line, riser, control valve, distribution piping, sprinkler <br /> heads, etc.) will connect to a fire main which has an existing cross connection <br /> control device. <br /> The minimum protection for cross connection control for existing systems is the <br /> same as listed for new systems, except as noted below for Class 1 and 2 systems <br /> only. <br /> The installation of properly sized assembly may cause an excessive pressure loss in <br /> some altered Class 1 and 2 systems. Such loss could make the system <br /> noncompliant with NFPA Pamphlets 13 and 14 as adopted. The Responsible <br /> Managing Employee shall document to the Approving Authority that reasonable <br /> modifications will not compensate for the additional loss. The documentation shall <br /> contain a listing of the minimum flow and pressure, headloss summary, desired and <br /> calculated sprinkler head output and a summary of the options examined to reduce <br /> headloss. <br /> For these installations, if not already installed, the existing cross connection control <br /> device will be replaced with two check valves in series (one of which can be the <br /> alarm valve), each valve meeting AWWA C508-82, UL 312-88, or UL 193-88, or <br /> • the latest versions thereof, and equipped with a resilient seating surface. The <br /> valves or adjacent piping shall be equipped with a sufficient number of resilient <br /> seated test cocks (minimum diameter of one quarter to one-half inch) to determine <br /> the effectiveness of each valve (there shall be no leakage past any check valve). <br /> Sufficient isolation valves - one valve upstream of the valves and one valve <br /> downstream of the valves - shall be present or added to the system to permit this <br /> testing. <br /> Existing fire protection systems which are not being modified, enlarged, or <br /> expanded are not required to upgrade to comply with this policy. <br /> 4.8 CONSUMER RESPONSIBILITIES <br /> The consumer shall: <br /> A. Eliminate all cross connections or install an approved backflow prevention <br /> assembly on the water service line. <br /> B. Immediately correct any malfunction of the backflow prevention assembly. <br /> C. Inform the Approving Authority of any proposed or modified cross connections <br /> ® 16 <br />