• Introduction
• Crossflow separators series 'a'
• Counterflow separators series 'b' & 'c'
• Venturi scrubber series 'd'
• Duct mounted series 'e' fume scrubber
• Johndec scrubber packers
• Johndec mist eliminator matt

Duct mounted series 'e' fume scrubber

PERFORMANCE
The Johndec duct mounted Fume Scrubber is a compact unit and has a high performance rating compared to its overall size. While designed principally to handle perchloric acid fumes, it can be adapted to suit many other fume scrubbing applications.

It is developed especially for mounting directly above Johndec Fume Cupboards. The unit can also be adapted for fitting to adjacent ductwork or to other manufacturers' fume cupboards when circumstances dictate.

The unit is normally supplied with a water wash supply from packaged recirculating system located below the fume cupboard. The recycling plant, for use with the scrubber unit, consists of a recycling tank, pump assembly and linking pipe work to form an enclosed system. Effluent levels can be checked before the discharge is drained and the water in the tank can be dosed with the appropriate neutralising agent.

The unit is designed to fit directly to the flanged outlets of the Johndec range of aerodynamic fume cupboards, although in some circumstances, it can be fitted up to one metre above the outlet without the necessity of sprays in the duct.

SPECIFICATION

Click for larger diagram

NEUTRALISING TANK
The tank and removable lid is manufactured from chemical grade plastic. The tank is fitted with a water supply inlet and plastic ball float valve. Incorporated in the side of the tank is a sight glass to enable a constant check to be kept on the fluid level, without removing the lid. A connection for the mist eliminator drain return pipe is provided in the upper part of the tank, which also has an overflow pipe, connected to the main drainage pipe work.

Click for larger diagram

PIPE WORK
All pipe work, valves, etc. are pre-plumbed between recycle tank and pump; pump to spray section of the fume scrubber; drain from scrubber to recycle tank; and overflow from the tank to drain valve connection. It is disassembled and left ready for easy reassembly on site.

ADVANTAGES
The Johndec Fume Scrubber can remove up to 98% of perchloric acid fumes before they enter the main extraction ductwork. The old traditional method of fitting sprays throughout the entire run of the extraction ducting is questionable in its efficiency. As well as being suspect in this respect, they are cumbersome and expensive to install.

All services to the Johndec unit are contained within the fume cupboard and its support unit, with easy access to pump, tank, etc.

The unit is self-contained and all components are visible. Inspection maintenance is simplified. The traditional duct washing method requires inspection of each spray nozzle throughout the extraction system and this can be hazardous in itself.

Problems of draining water throughout the entire system are avoided.

The unit consumes less water when the closed circuit recirculating wash system is installed.

Before discharging and draining the washing solution from the recirculating tank, it can be tested to ensure compliance with the requirements of the various authorities.

Overall installation time is reduced.

For most applications the Johndec Fume Scrubber unit will be less costly and more efficient.

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