1995-007181 - new septic system - Laserfiche WebLink

Home Browse Search

F-17 � PLJMP SELECTION PROCEDURE • END PERFORATION OF A PERFORATED LATERAL A Determine pump capacity: �,d.v.., Gravity Distribution T�,,,,, f� ]. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of :::•�� . «�..N�w�.k��.� wa ter use rate. � '..a""s"°�°"'� '�''°�-«"°�..�..�...'�° `M,.�.,..r,...., 2. Maximum suggested for delivery to a drop box of a home system is 2,700 , ►Kw.��a��.oa�a�. aw cao w.e.T.o gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ,,.,.,, `_.,�.,,, ,2•,.E.,. . wi .r n.�a ur.� Pressure Distibution 3 '•.� ,o�..��.u,. ��~•� e.��,«u�.� 3.a. Select number of perforated laterals b. Select perforadon spacing= 3. o fee� °""'°';'a;�„�""° Bdv�P c. Subtract 2 ft from the zock layer length. ,��,°�-2 ft._��_feet , d. Deterrrune the number of spaces between perforations. Length perf.spacing=�ft.+ � ft._ /�_spaces Requited Perforaaon Disch e e. /6 spaces+1=�perforations/lateral �+��+s p��te(sp� f. Multiply perforadons per lateral by number of laterals to D�harge � � � g• �t total number of perforations. �� x �,��= S'/ perforations. H�U �'Z � �"°'P"� X •6T�,_�gP�• 1.Oa 0.56 0.74 SELECTED YUNiP CAPACIIY gpm 2.�b �.8� 1.�4 B.Determine head requirements: a.Use for single family homes 1. ElevaHon difference between pump and point of discharge. b.Use for all other applications �R_feet 2. If pumping to a pressure distribution system,five feet for pressure �� required at manifold if gravity system,zero. _,�feet 3. Fricdon loss a. Enter friction loss table with gpm and pipe diameter. Pip�Lengch Read friction loss in feet per 100 feet from table. � Point of Disct F.L.= Z, y� f�/100 ft of pipe .. b. Determine total pipe length from pump to discharge Eie�adon Difference� point. Add 25 percent to ripe length for fittins p�p loss,or use a fitting loss chart. Equivalent pipe length-1.?5'times pipe length= F-18b � OD x 1.25= /ZS feet 1.5 inch 2.0 inch 3.0 inch c. Calculate total friction loss by multiplying � �;a;a„�,��n,�P;a friction loss in h/100 ft by equivalent pipe length. Tota1 friction loss= ?. Y/ ' x 2 S +100= feet 10 0.69 0.20 l �- 12 0.96 0.28 4. Total head required is the sum of elevation difference, 14 1.28 038 special head requirements,and total friction loss. 16 1.63 0.48 18 2.03 0.60 20 247 0.73 0.11 ._�+ -� + .� 25 3.73 1.11 0.16 (1) (2) (3c) 30 5.23 1.55 0.23 35 7.90 2.06 0.30 40 11.07 2.64 0.39 TOTAL HEAD �S feet 45 14.73 3.28 0.48 . 50 3.99 0.58 55 4.76 0.70 C. Pump selection 6o s.6o 0.82 1. A pump must be selected to deliver at least �-� .�8' gpm .(Step A) with at least �6 feet of total head(Step B).