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0�111ES <br /> be able to discharge approximately 23 tains all solids Imger than a nominal size I from the house to the end of the system. <br /> L/min(6 gal/min)at a total dynamic I in the tank.Some pumps are equipped The most common sources of conven- <br /> head(TDH)of 55 to 73 in(180 to 240 ft), wfth flow restri'tors to avoid excess tank tional septic tank and drain field hydrau- <br /> depending on the manufacturer. I turbulence when pumping at low TDH. lie overloads are leaking building sewers <br /> The pump may be set inside of a The single most important criterion and tanks.Watertight STEP tanks usually <br /> screened pump vault or in a vault that is related to STEP system success is install- I are fabricated of either concrete or fiber- <br /> preceded by a protective screen that to- ing and maintaining a watertight system glass and equipped with integral rubber <br /> boots for entry of the building sewer or <br /> Inlet fine into the tank.Watertight risers <br /> HWDHAfCL7D By OVER j 00(Ci .. <br /> h'om the tank to the surface are sealed <br /> i to riser rings that are an integral part <br /> • _ • WME INSMALLArloms, -• •• of the tank,and a watertight,gasketed, <br /> • DEwATERINGMCHNOLOGY and bolted lid is installed at the top of <br /> •-- 9 the riser.All pump and float cords exit <br /> • - ;ram. - S- <br /> � t•• p`�t f r i the tank through watertight grommets <br /> YOUR i <br /> FOR <br /> r WAM SOr,r,,O j, in the riser wall, <br /> STEP pumps discharge to small-diarn- <br /> eter collection systems that also must be <br /> ' ,. .x installed and maintained as.watertight <br /> 1,100+ systems.Successful STEP collection <br /> _ _ =- systems have used thermally fused high- <br /> SOLUTIONSdensity polyethylene pipe and polyvinyl <br /> chloride pipe connected witli elastomei--- <br /> ic slip joints.These collection systems <br /> . I must be as free as possible from entry <br /> BELT PRESS of groundwater or surface water.Hence, <br /> ' they do not contain manholes and ide- <br /> ally should contain no cleanouts. <br /> •® Septic tank discharge collection sys- <br /> terns,or effluent sewers,consist of <br /> some combination of STEP units and <br /> - - - - septic tank effluent gravity(STEG)units. <br /> STEG units also consist of a watertight, <br /> SLUDGE BAGGING structurally sound concrete or fiberglass <br /> tank with an effluent filter to retain sol- <br /> ids within the tank.Collection systems <br /> •• _ I can be pure STEG,STEP,or a mixture, <br /> t t <br /> ORLDWIDEf - Gravity tanks can discharge to the col- <br /> , lection system at any place where the <br /> elevation of the tank discharge is above <br /> the elevation of the collection system <br /> hydraulic grade line. <br /> STEP collection lines frequently are <br /> installed at a constant depth below what- <br /> ever is[he local frost depth.The shallow <br /> AERO-MOD IS COMMITTED TO PROVIDING COST-EFFECTIVE.LOW MAINTENANCE.AN. depths and sizes of pipes favor trenching <br /> OPERATOR FRIENDLY DSWATERING SOLUTIONS FULLY SUPPORTED By IN HOUSE the lines.Wide,deep ditches are not neo- <br /> TECHNICIANS AS WELL AS A STAFF OF FIELD TECHNICIANS, essary.Tracer wire along every section <br /> WITH OVER 25 YEARS MANUFACTURING CUSTOM WASTEWATER AND DEWATERING of pipe including service connections <br /> TSCHNOLOGIE�E AERO-MOD SERVES AS AN INDUSTRY LEADER IN PROVIDING SOLUTIONS FOR WASTEWATER TREATMENT AND SOLIDS HANDLING. will allow for future line repair or for line <br /> markings prior to other digging. <br /> Combination air-vacuum relief(CAI/) <br /> 1 valves may be necessary at the top of <br /> 0 rres-r•tvww-WEF.ORG/MAGAZINE <br />