Laserfiche WebLink
ESTINATING THE CUSTOMEK'S PEAK DEMAND <br />� TABL,E 4.2 <br />A�ultipliartion Factors to Adjust Demand Lead as <br />Obtained from the C:urves rr: Figs. 9.4 or 4.5 to <br />various Utili�p Dr.(iverv f'ressures at the Meter Outlet <br />nS! <br />zo <br />30 <br />35 Dase <br />40 <br />SO <br />60 <br />70 <br />80 <br />90 <br />100 <br />Factor <br />o.�a <br />0.92 <br />I.00 <br />1.07 <br />1.22 <br />1.34 <br />lA6 <br />1.57 <br />1.68 <br />� <br />at lhe outlet of the meter, therefore, this location was selected. All calculations are <br />made on the base pressure of 35 psi at the meter outlet, and pressure correction <br />factors are included in Table 4.2 to assist the estimator in adjusting data from the <br />graphs to the slanJard minimum delivery pressure o(his utility. <br />Fixture Values <br />A fixlure valuc is a quantily in terms of which the demand producing effects on the <br />plumbing system of Jifferent kinds of plumbing fixtures are expressed on some <br />arbitrarily chosen scale. A table of thesc values is included that represents the flow <br />demand of each fixture when it is operated witltout the interference of other units. As <br />an example, a b:�thtub was filled normally with no other fixture in use at 35 psi <br />downstream of the meter to obtain a(low rate of 8 gpm, so a value of 8 was assigned <br />this item. T'I�ese values are shown in Table 43, and the estimator can casily obtain the <br />z�, <br />:a <br />:7 <br />70 <br />Ifl <br />E iG <br />� IA <br />E �2 <br />� lp <br />8 <br />c <br />a <br />a <br />0 <br />r�- <br />b <br />Z <br />0 <br />c <br />% <br />� N <br />R F � <br />� o ' i <br />/ + <br />L l_.1_- _1 <br />1 . l � J <br />u <br />� <br />a <br />0 <br />i <br />� c <br />O <br />/ <br />+ <br />r <br />o E X <br />'� v�i u <br />�� ��'- <br />�� 3� <br />�o <br />s¢ � <br />+ Fiel�l fiecoM�nq� <br />Co�nm Cnuui, Te� <br />� <br />6 1 8 9 10 11 17 17 14 15 1G 17 IB 19 70 71 7? 7d 7i ?5 <br />r�.w« w,n vm�< <br />Fig. 4.2. Flow Demand ot Household Fixtures <br />