Form V372, Rev. 12
- 11 -
12/18, ECN4334
SECTION 6: SHUTDOWN INSTRUCTIONS
Shutdown of the Rotamix™ system involves stopping the pump(s). Again, see the pump IO&M Manual.
Note also that if you are mixing a sludge storage tank that heavy, lime-stabilized sludge should not be
permitted to sit stagnant in the system piping. The piping should be flushed with light sludge or water
before securing the system. Especially with an open-top storage tank where the sun can heat the
piping, the sludge can dry out and ultimately cause plugging of the mixing nozzle(s).
SECTION 7: MAINTENANCE
A. ROUTINE MAINTENANCE
No routine maintenance is required for Rotamix™ floor-mounted nozzle assemblies as these units have
a standard 10-year warranty, are made of ductile cast iron and are completely glass-lined. If you have
occasion to enter your digester or storage tank, you will want to inspect the nozzle assemblies and
piping to make sure the equipment is in good working order and that the nozzles are still properly
aimed. Whenever you check the nozzle system, inspect the nozzle opening to make sure that the glass
coating is still intact. If the glass coating and ductile iron metal is worn away, replace the nozzle. For
polyurethane nozzles, measure the discharge diameter to make sure that it is no more than 15 % larger
than it was when new. (For example, a new 2.00” dia. nozzle should not be larger than 2.3”. If it is
larger than 2.3”, replace it.) Nozzle exit diameters are defined in the PARTS section of your custom
Installation, Operation and Maintenance Manual for your Rotamix system.
Venting systems may require yearly inspections to make sure they are working properly and staying
clear of debris. Vaughan always supplies the flushing option with the air release valves we supply.
B. CORRECTIVE MAINTENANCE
Replacement of any Rotamix™ nozzle assembly components is self-explanatory. Fittings are attached
to each other on the assembly by clamps. Contact Vaughan Co. for pricing on replacement
components. The parts list for the nozzle assembly is included in your Rotamix™ system I,O&M
Manual Parts Section.
