SR0072571 - Laserfiche WebLink

Home Browse Search

vibration dampeners. For easy adjustment of the V -belt drive connection between the blower and motor, the motor will be mounted on an adjustable motor mounting base. The blower will be fitted with a dry type filter/silencer at the air intake. Each blower discharge will be fitted with a check valve, and a flexible rubber discharge coupling. For purposes of determining the blower performance and/or diffuser condition, a pressure relief valve and pressure gauge will be mounted in the air manifold. N. Central Control Panel A central control system installed within a weatherproof enclosure will be provided. The enclosure will be rated NEMA 4X -F Fiberglass. The electrical controls will consist of magnetic starters, program timers and switches necessary to automatically control all electrical devices and/or motors on the sewage treatment system. M -O -A selector switches and magnetic starters in conjunction with the program timer will control the blower/motor. The program timers will have the capability to operate the treatment system when required as determined by the variation in the daily flow rate. Properly sized circuit breakers and fuses will protect all electrical equipment and circuitry. The control system will be designed to operate all duplex or standby equipment. The enclosure will be wired for 230 volt, 1 phase incoming power. The control panel will be mounted at a remote location. O. Access Ladder, Service Walkways, and Service Handrails A service walkway will be provided over the flow equalization tank and sludge holding tank to service the plant equipment. Grating panels will each consist of one-piece skid resistant steel plank. All grating panels will be constructed of 18 gauge, galvanized steel sheet. Each grating panel has a standard 6" or 9" surface width and a 2 1/2 " rib depth. Each panel will be supported to insure a safe uniform load carrying capacity" of 80 pounds per square foot. A two handrail system be provided around the service grating areas described above. Service Handrails are supplied with mounting flanges for bolting into place. The rails and posts are fabricated from 1-1/4" diameter schedule 40 carbon steel pipe, painted black. P. Cathodic Protection For cathodic protection for tanks partially or fully buried, six (6), 17 -pound magnesium anode packages will be supplied. Anodes should be buried by the field contractor, adjacent to the sides of the vessel and securely connected thereto by heavy copper wire in good electrical contact with the connector lugs on the steel vessel.