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THE PIRANHAVAC SOLUTION
The innovative design of the "PiranhaVac" acid injection unit, developed after extensive trials abroad the P&O
vessel "Oriana", has produced a method of cleaning vacuum pipework systems that are 100% effective but with none of
the inherent problems and disadvantages of the current cleaning methods. The "PiranhaVac" unit is connected to the vacuum
system at the extreme end of each line.
The unit comprises a Solenoid Valve, Electronic Timer Unit, Chemical Tank and Injection
Interface Line. The Solenoid Valve can be programmed to open at a given interval for a pre-determined time. When the Solenoid Valve is open
(say for 20-30 seconds every half an hour), the pressure differential in the pipe will allow a combination of ambient air and chemical dilutant
to be drawn into the system.
The vacuum collection plant remains operational
at all times and the sewage system is effectively cleaned whilst all of the vessel's toilets are in operation!
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The effectiveness and safe action of the "PiranhaVac" cleaning method is due to:
 Spiral Action
Previous experience has proved that the slug of sewage moves down the vacuum pipe work in a spiral action. Consequently, the
chemical will move in the same manner, thereby ensuring that the complete wall of calcinate will eventually be coated with the
chemical dilutant.
Little and Often
With the inherent spiral action the "PiranhaVac" method only requires a small amount of chemical on a "Little and Often" basis,
which would not be considered detrimental to the sewage treatment plant biological process, toilet mechanisms or pipe work.
Concentration
The quantity and strength of chemical injected into the system in a normal cleaning cycle can be considered minimal and is usually
discharged into the vacuum collection plant before disposal either directly overboard or to an STP. The solution eventually becomes
diluted within the pipe work and tank contents and would not prove detrimental to the sewage treatment plant's biological process. |
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