Agenda - 01-04-1988 - Laserfiche WebLink

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4 4 033 4 Service lines from the pump basin Elevated Drain Fields - In this situa- to the street are usually 1-3G" I.D. tion, the soil conditions near the Type I Schedule 40 PVC solvent welded home are not acceptable for a drain pipe. Force mains will normally be field. Consequently, the effluent is SDR26 and SDR21 PVC pipe with pumped to another location on the elastomeric sealed joints running property which has acceptable soil anywhere from 1•*" to 6" I.D. in conditions. size, depending on the number of Alternate Drain Fields - In this case, a house connections. Occasionally, one drain field is not quite adequate polyethylene pipe is used for the for proper field disposal. A second force mains, especially in extremely drain field is installed and the two • Cold climates. fields are alternated by using a a valve and a STEP pump. Septic tank effluent flowing from a Cluster Concept - In this application, STEP pressure sewer can be dis- a cluster of several homes will install • charged to a gravity manhole, treat- septic tanks and STEP ment plant, lagoon or large drain pumps. The field. However, if discharging to a • effluent is then pumped by a 4 gravity manhole, care must be taken common force main to a drain held W handle potential odor and corro- located some distance from the 1 Sion problems generating from septic individual homes. ' tank effluent. Due to the reduction Dosing Fields - In this application. 4 in .organic and hydraulic loadings, it has been shown that the effluent the cost of treatment would be lower from the septic tank may not flow + in comparison to conventional gravity properly by gravity throughout the flow. drain pipe. By installing a STEP pump the drain field is dosed by pressure 4 generated by the pump insuring that APPLICATIONS FOR the effluent reaches the entire drain . EFFLUENT PUMPS field. There are basically two markets for In pressure sewer applications we 4 STEP pumps. One is referred to as normally define a pressure sewer as onesy-twosy (OT)applications. Here. a system containing at least 25 pumps 4 we mean that only one or a few discharging into a common force STEP pumps will be installed in a main. Most residential STEP pressure given application. The other market sewers are designed with one pump 4 area is pressure sewer applications. per home. In some pressure systems Specific STEP applications in the there will be multiple residential con- 0 OT market would be as follows: nections to one simplex or duplex STEP pump. � �ents/Condos Trailer Parks Small Office Due to the administrative problems Small Motels Buildings of who pays for power, where power Interstate Rest small Hospitals is connected,obtaining right-of-ways, 1 Stops Nursing Homes etc., the majority of STEP pressure Indivioual Homes Campgrounos . oeral sewers being installed are using one Intermediate Pump Slate and Fe 1 - Stations Parks pump per home. The decision on Restaurants Industrial Plants single or multiple pump connections 1 The DT applications for effluent will be up to the design engineer i - - pumps differs from grinder pump and his client based on their specif- 1 applications as they would relate to is needs. Specific applications for discharge.In OT grinder applications STEP pressure sewers are: the sewage is, in most cases, being -_ discharged to a collection system and ultimately to a treatment plant. •'I Small r rural In STEP OT applications,the effluent �Pnnanes - _ is usually being discharged to a drain field. areas) pockets within cities (low lying Dver the past severs! years, there •Fecmational lake developments have been a number of OT STEP Avanmsnpat `moe °prr'0le"e3 • plant eomp►exps - applications that have been developed •Small vanapte gravity sewers that utilize an effluent pump. Some = typical examples are: . . ♦ 2 -CRAIG S.MORGAN ANp ASSOCIATES,P.A. /