# WATER MEASUREMENT USING TWO INCH (50 mm) DRAIN TESTS

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2 TABLE 1 Equivalent Length Computations Fitting Angle valve Globe valve Gate valve 90 Elbow 45 Elbow Tee where flow turns Cross where flow turns Equivalent Length (ft) SI Units: 1 m = ft METHOD To make a water test from a 2 in. (50 mm) drain, the following procedure should be used: Determine the equivalent length of the 2 in. (50 mm) drain from the sprinkler riser to the outlet. Equivalent lengths for several common drain line fittings are shown in Table 1. Examine the discharge outlet to be sure it is 2 in. (50 mm) and either reasonably well reamed or provided with a 45 elbow. Open the drain valve wide, and allow it to flow until the pressure on the riser gauge(s) stabilizes. Check visually for full discharge at the outlet. Record the residual pressure and close the drain valve. Using Figure 1, read horizontally across at the riser gauge residual pressure to the curve indicating the equivalent length of the drain. It is acceptable to interpolate where necessary. A vertical line from this intersection will indicate the flow from the drain. The curves in Figure 1 have been developed by calculation and test. By following the above instructions and the parameters previously indicated, it is possible to establish a flow with an accuracy that is within acceptable limits ( ± 5%). When using this method, care must be taken to be sure that: A true static pressure is recorded. Artificially high pressures, such as those of jockey or excesspressure pumps or those trapped by check valves, must be bled off to get this true static pressure. A true residual or flowing pressure is recorded. The reading must not be taken until this pressure has stabilized. This could take a considerable length of time in many systems. While it is possible to develop a reasonably accurate flow test using one 2 in. (50 mm) drain, even greater accuracy will result from the flowing of 2 or more drains simultaneously, provided the drains are not cross connected. EXAMPLE PROBLEM: Determine the water supply available for the two riser plant arranged as shown in Figure 2. The drain on riser A consists of 8 ft (2.4 m) of 2 in. (50 mm) pipe, 1-2 in. (50 mm) angle valve, 1-2 in. (50 mm) elbow, and a 45 elbow on the discharge outlet. The drain on riser B consists of 22 ft (6.7 m) of 2 in. (50 mm) pipe, 1-2 in. (50 m) angle valve, 3-2 in. (50 mm) elbows, and a 45 elbow on the discharge outlet. 2 A Publication of Global Asset Protection Services LLC

3 Figure 1. Flow Through 2 in. (50 mm) Drains. SI Units: 1 bar = psi; 1 L = 3.78 gal. Figure 2. Example Riser Layout. A drain test at riser A results in a static of 100 psi (6.8 bar) and a residual pressure of 86 psi (5.8 bar). 3 A Publication of Global Asset Protection Services LLC

4 While the drain on riser A is open, the drain on riser B is opened also. The resulting residual pressures are 64 psi (4.3 bar) at Riser A and 70 psi (4.8 bar) at Riser B. Find the amount of water being discharged in gpm, and plot the water test. Answer: The equivalent lengths of the drains must first be determined. These are: Length of 2 in. (50 mm) pipe 1 Angle valve 90 elbows 45 elbows Drain A 8 (1) 5 2 TOTALS Drain B 22 (3) 15 2 Using the drain test at riser A alone, with the residual pressure of 86 psi at the equivalent length of 44 ft (13 m), the flow from drain A is 450 gpm (1700 L/m). Next, using simultaneous flows from A and B, the flow at A = 390 gpm (1470 L/m), the flow at B (with equivalent length of 68') = 335 gpm (1270 L/m). Thus the total flow is 725 gpm (2740 L/m). Using riser A for the point of static-residual pressure in both cases results in the following 2 points on the water supply curve: (1) S = 100 psi (6.9 bar) R = 86 psi (5.9 bar) Flow 450 gpm (1700 L/m) (2) S = 100 psi (6.9 bar) R = 64 psi (4.4 bar) Flow 725 gpm (2740 L/m) These points will plot as a straight line on N 1.85 semiexponential graph paper as shown in Figure 3. BACKGROUND For any given flow through a 2 in. (50 mm) drain on a sprinkler system, the pressure on the riser gauge will be greater than the pressure at the outlet by the amount of friction loss between the two points and the elevation difference. This elevation difference is usually only a couple of feet (meters) and results in only a minimal pressure difference and is ignored for simplicity. In addition, the total pressure at the riser gauge is slightly higher than the normal pressure indicated by the gauge due to the velocity pressure within the riser. With the stipulation that the gauge be placed on the riser, the velocity pressure will be minimal (approximately one psi [0.065 bar]). This is also ignored to eliminate a trial and error solution to the problem. Placement of the gauge on the 2 in. (50 mm) drain will introduce significant error if velocity pressure is not taken into account. In order to be able to measure the water supply available by using a 2 in. drain test, it is necessary to determine the drain flow (Q D ), for a given pressure at the riser (P R ). 4 A Publication of Global Asset Protection Services LLC

5 Figure 3. Straight-Line Graph For Water Supplies. Tests were conducted to determine the outlet coefficients for typical 2 in. (50 mm) drain configurations. These were found to be approximately 0.9 for a reamed 2 in. (50 mm) outlet, and 0.85 for either an unreamed 2 in. (50 mm) outlet or discharge through the outlet on a 45 elbow. Using the more conservative coefficient of 0.85 and hydraulic tables or formulas, the outlet pressure for a given flow can be calculated. In order to relate this information to the riser gauge (P), it is necessary to determine the friction loss in the 2 in. (50 mm) pipe between the outlet and the riser. To do this, a C factor of 120 was used for the pipe, and various equivalent lengths of pipe were used to develop friction losses for various flows. The friction loss plus the outlet pressure equals the riser pressure. The flow vs. riser pressure curves for several equivalent lengths are plotted in Figure 1 for easy reference and can be used to determine the drain flow by knowing only the riser gauge reading and the equivalent length and outlet configuration of the 2 in. (50 mm) drain. 5 A Publication of Global Asset Protection Services LLC

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