Modular chemical dosing systems – a different and innovative approach

Posted: Wednesday 3rd July 2013

Within many industrial applications, building services installations, pool plant rooms, etc. there exist thousands of installations where a dosing pump sits either on a bracket or on top of an IBC or dosing tank, dosing various chemicals from glycol, anti-corrosion inhibitors, acids or alkalis for pH correction, chlorine for disinfection, ferric for coagulation, boiler feed chemicals, etc. Some of these installations use individual pressure relief valves with the relief line routed back to the chemical container. This is to protect the pump and pipework in the event of a blockage and subsequent over pressure. Pressure loading valves are often included to prevent the chemical from syphoning and to aid accurate dosing terminating with some flexible discharge hose and a spring loaded injection fitting. Others use a multi- function valve which combines the functions of pressure relief valve and pressure loading valve and allows de-aeration of the pump and emptying of the discharge line for maintenance. Some poor installations use a dosing pump with only discharge hose and injection fitting, which is acceptable if dosing into an open channel but not ideal if dosing into a pressurised line as there is no pump protection.

In the event of a leak from the pump, chemical will leak onto the IBC or dosing tank which ideally should be sat on an IBC drip tray or bund, this scenario exposes chemical to the atmosphere and creates an unsightly mess.

What should happen if a hose blows off?

The WES DosingCube™ deals with all of the above and more, with particular emphasis on containment. It is a portable (can also be used for a permanent fixed installation) fully enclosed chemical dosing system comprising a weatherproof polyethylene rotationally moulded enclosure into which is fitted a Digital Dosing pump complete with pressure relief valve, pressure loading valve (or multi-function valve used for DosingCube™ Eco versions), bund leak detection switch.

The polyethylene enclosure IP54 rated, with an integral drip-tray is resistant to most chemicals & has a lockable toggle catch, carrying handles, two 316SS hooks for hanging off a wall mounted rail or IBC and a clear see through window to check the pump running or alarm status without opening the enclosure.

The Digital Dosing Pumps allowing direct operator entry of dose rate in LPH. Also, allowing manual or auto operation modes with direct input of pulse, 4-20mA flow proportional control signals, batch or timer control with alarm outputs.

The suction & delivery pipework can be dual contained with the outer sleeves connected directly to the DosingCube™. Any pipework leakage is detected by the switch in the drip tray.

There is also a safety splash screen—even with the lid open, the pump head, valves & pipework are covered with a clear uPVC screen.

In addition the integrated bund/drip tray will contain any leakage and the level switch will inhibit the pump. A drain plug allows any residual chemical to be drained safely.

All models are available allowing dose rates as low as 0.0025 l/hr or up to 150 l/hr and pressures to 16 bar, are dual voltage 110-240V and supplied with a 110V plug on flying lead supplied as standard.

The DosingCube™ can be supplied to either sit on an IBC or mounted on a wall rail such that it sits above the IBC or dosing tank & bund.

The WES DS200 system is a step up from the DosingCube™ and can be configured to accommodate duty or duty/standby dosing pumps with accessories and pipework, also has an integrated bund with bund switch and can be supplied with a 100L or 200L dosing tank or a grid for standing 1 or 2 chemical carboys.

Where something a little more substantial is required but the expense of a full blown containerised chemical dosing system is prohibitive, our latest SC1000 IBC bunded chemical dosing system offers users a cost effective alternative.

The WES SC1000 is specifically designed for outdoor use and prevents the common problem of most IBC bunds filling with rainwater. With most commonly used IBC bunds, once rainwater is present, if the water is not pumped out it becomes non-compliant. This does not meet the 110 per cent capacity rule, which states that the bund should be capable of storing 110% of the storage tank contents.

The WES SC1000 meets the pre-requisites for safe and secure (lockable) storage and containment required by responsible users of chemicals stored in IBCs, whilst at the same time offering operators ease of use. This unit is fully compatible with other WES standard products to form small standalone dosing systems. (DosingCube™ and DS200) and also offers much more secure containment of Hazardous Chemical (Hazchem) with its roller shutter door. This greatly reduces the occurrence of vandalism and improves safety.

Options include IBC supply, a fill point backboard, electric drum pump to transfer chemical and an eye wash station.

Sound Engineering Practice (SEP) is adopted throughout manufacturing and with integral chemical containment, automatic leak detection cut-off & splash screens our equipment provide a safe dosing system for both operator & environment.

Further data available: www.wes.ltd.uk or www.wesdp.com

Contact: WES Ltd (T) 01256 819777 or Email: info@wes.ltd.uk




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