PMV Water Savings Calculator Jan 2008 Version 2REVB.xls

WATER CONSERVATION | PIPE BREAK PREVENTION | LEAKAGE CONTROL | SYSTEM EFFICIENCY | ENERGY SAVINGS

PRESSURE MANAGEMENT ANALYSIS FOR 98-01* PRESSURE MANAGEMENT CONTROL VALVE PREPARED BY: CLA-VAL Application Example www.cla-val.com DATE:
SYSTEM INPUT DATA		OUTPUT DATA FOR SYSTEM LEAKS
Pipe Size	in	Average Flow Rate	gpm
Estimated Daily Water Usage	gal	Average Flow Velocity (approx.)	ft/sec
Standard System Pressure	psi	Average Weekly Water Usage	gal
Estimated System Leakage	%	Average Annual Water Usage	acre-ft
	$	Average Annual Water Usage	mg
		Estimated Daily Water Loss Based on Standard System Pressure & Estimated System Leakage	gal
		Estimated Annual Water Loss	acre-ft
System Leakage Orifice Dia	in	Annual Financial Loss Due to Estimated System Leakage	$
PRESSURE MANAGEMENT INPUT DATA		PRESSURE MANAGEMENT OUTPUT DATA
Outlet Pressure (min)	psi	Estimated System Leakage at Standard System Pressure & Before Pressure Management Input Data	%
Time at Max Pressure (daily)	hrs		%
Time at Min Pressure (daily)	hrs	Calculated % of System Leakage Recovered with Pressure Management Input data	%
Leakage Coefficient, N1	-		%
		Average Daily Pressure with Pressure Management Input Data	psi
Leakage Coefficient Guideline		Average Daily Pressure with Pressure Management Input Data	psi
Leakage coefficient, N1, can vary depending on factors such as pipe material, level and type of leakage as well as the type of distribution system (residential, commercial, agricultural, etc.). For analysis purposes the following guideline can be used to select a number for N1. These N1 values are referenced from a system leakage analysis study. The user may want to enter different values for N1 if they are familiar with the leakage analysis method used and the proper coefficient value for their particular system. N1 = 1.5 is an average leakage coefficient value used for typical systems with undetectable background leakage with any pipe material. N1 = 1.0 is recommended if there is an abscence of knowledge of pipe materials and leakage level. N1 = 1.15 is a japanese standard used for their systems for the past 20 years. N1 = 1.52 was an average value determined from lab tests by Ashcroft & Taylor (Surveyor, July 1983) on artificially created leaks in plastic pipe. N1 = 2.50 maximum recognized coefficient value for systems with excessive leakage. Although some general theories reference upper coefficient values of 2.50, case studies associated with this value were not found.		Calculated Daily Water Savings with Pressure Management Input Data	gal
			gal
		Calculated Annual Water Savings with Pressure Management Input Data	acre-ft
			acre-ft
		Calculated Annual Water Savings with Pressure Management Input Data	mg
			mg
		Calculated Annual Financial Savings with Pressure Management Input Data	$