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Considering a Pressure Sewer? <br /> .90.348-9843 <br /> Wondering whether to STEP or grind? <br /> PUMPS <br /> High head turbine STEP pumps... Grinder pumps... <br /> •don't corrode—stainless steel and/or thermoplastic •corrode over time,even with protective coatings <br /> •are lightweight—25-30 pounds •are heavy—most weigh over 100 pounds <br /> •have a longer life—20 to 30 years •have a much shorter life—5 to 10 years <br /> •have a higher head capacity(Yz HP-250 it±) •have a lower head capacity(11/z HP-150 it±) <br /> •use smaller motors(1fx HP most common) •use larger motors{111z to 2 HP mast common} <br /> •are available in 115 or 230 volt power •require 230 volt power <br /> •are easy to service and rebuild •are more difficult to remove,service,and rebuild <br /> •cost$400 to replace •typically cost over$1200 to replace <br /> •have typically low energy costs(moving liquids only) •have higher energy costs(moving solids) <br /> COLLECTION LINES <br /> STEP lines... Grinder pump lines... <br /> •use smaller pipe sizes—typical service line is 1" •use larger pipe sizes—typical service line is 11/4" <br /> •handle only the liquid portion of sewage •handle all liquids and solids in macerated slurry <br /> •do not require periodic pigging(cleaning) •require periodic pigging <br /> •do not require minimum velocities and can be oversized •require minimum scouring velocities—pipe sizing is critical <br /> for future growth --pipe sizes that are too small cause excessive headless <br /> —pipe sizes that are too large clog and require frequent cleaning <br /> •use a Hazen-Williams coefficient,"C"of 150(lower friction) •use a Hazen-Williams coefficient,"C"of 120(higher friction) <br /> •use low cost air release valves as used In water delivery systems •use expensive sewage air release valves <br /> ON-SITE FACILITIES <br /> STEP tanks... Grinder chambers... <br /> •perform 45%to 55%of sewage treatment •provide no treatment nor removal of grease or oil <br /> (95%grease and oil and 85%solids removal) <br /> •have minimum 24 hours emergency storage and •have little or no emergency storage/ <br /> hydraulic retention time, <br /> approximately 5 days hydraulic retention time requiring service personnel to respond to alarms immediately <br /> •generally require septage pumping no more frequently than <br /> every 10-15 years depending on occupancy loading <br /> Continued on back <br /> SHO.EEs-1 <br /> ©28030renco SYs[ems®Ina Hev.1 f3 <br /> � Pa.geg.I of 2 <br /> s <br /> 's <br />