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YET UL NOME <br /> high points in the lines.Although STEP pumps usually can <br /> _ . overcome the extra head represented by the gas bubble if the <br /> pipe run is short,it is good practice to minimize these spikes <br /> in headless through the use of these CAVs and minimization <br /> of high points.CAV valves are most necessary on systems in <br /> - which TDH comprises a significant portion of the available <br /> 1 pump operating head.When the collection system includes <br /> .�-� both STEP and STEG tanks,siting of CAV valves becomes more <br /> critical.In residential locations,these valves can be a source of <br /> odor complaints if they are constructed without edor-control <br /> appliances,such as soil filters, <br /> operations and Maintenance <br /> STEP systems are generally low-maintenance systems.I <br /> currently manage decentralized utility operations with ap- <br /> proximately 1000 STEP and STEG customers.In our earlier <br /> systems,the electrical splice boxes and telemetry control <br /> panels required the greatest maintenance.We eliminated <br /> splice boxes and ran each float and pump cord through indi- <br /> Gardner Denver introduces the vidual conduits to the control panel.Control panels are sfm- <br /> ple,two-float"dumb"panels with elapsed-time meters.While <br /> intelligent IQ blower package. maintenance calls have been limited,most have involved <br /> • Engineered with innovation and quality line blockages between the house and the tank or high-water <br /> tin the resulting <br /> sul ting from <br /> someone turning breakers off or shut- <br /> Integral AirSmart'controller to provide g ball valve at the street. <br /> critical component monitoring Collection system maintenance is almost universally <br /> • Integrated starter or Variable Frequency related to digging in the vicinity of our line absent the man- <br /> Drive to provide bottom line efficiency datory notice of pending excavation.Invariably,this results <br /> - in broken lines,requiring emergency repairs. <br /> (optional) <br /> Intensely quiet(as low as 60 dBA) Potential impact on Sewer System Choices <br /> • Compact design Most municipal and other governmental entities have not <br /> yet embraced the STEP-STEG concept.Generally,they are <br /> • Backed by 150 years of proven results unwilling to have"septic tanks"in their system.Some have indt- <br /> Gardner Denver IQ blower package is Gated that STEP tanks will require too much maintenance.This <br /> claim is belied by the fact that most utilities require municipal <br /> more than intelligent- <br /> lift to be inspected at high frequencies—sometimes <br /> it's an intelligent way to work. daily—and STEP tanks would not have to be inspected more <br /> than once annually. <br /> j Many municipalities have service areas,portions of which <br /> cannot be served cost-effectively by the conventional sew- <br /> ers because of steep terrain or the extreme cost of installing <br /> such sewers in rocky ground.As STEP collection systems do <br /> not rely on gravity and can go in at a much shallower depth <br /> l Aff and a much smaller trench,these systems could serve such <br /> ©ENVPH areas.Some progressive municipalities are beginning to con- <br /> GAB Ow <br /> sider STEP systems as possible additions to their distributed <br /> ExpaAence r I-11 Re `F wastewater management arsenal. <br /> i www.GardnerDenverProducts.com Michael Hines is founding princtTnl .) Southeast <br /> ronme <br /> pd.blowers@gardn soo.bs2.986a ber ref the ttWater/tEnoirorment Federotion(Atexandrid, Va.) <br /> Small Communities Committee. <br /> k <br /> f S5i/WE&'r WWW.Wrr.e Ec/MAGAZINE <br /> } <br />