Cooling water systems dosing equipment

Equipment systems are available that will, periodically during the day or week, activate two pumps to add a prescribed volume of each of these two chemicals into a mixing tank. The tank contents are stirred, HOBr is produced, and the tank contents are then pumped to the cooling water system. Such systems can also incorporate bromine monitors and chart recorders, plus other dosing and control items. 

Apart from the primary components of a cooling water system, all ancillary equipment such as level controllers, bleed systems, dosing and control systems, low-level alarms, pH controllers, and on-site biocide generation systems should be regularly inspected, cleaned, calibrated, and maintained in good working order. 

This failure to provide dosing pumps is not good practice, as under almost every circumstance untreated cooling water systems will suffer from diminishing levels of efficiency, higher than necessary operating and maintenance costs, and shorter equipment life spans. 

There is a growing trend for many operators not to have any direct involvement with their cooling system chemical dosing equipment (with regard to the addition of chemical, mixing and chemical dilutions, pump adjustments, and possibly even periodic equipment inspections and maintenance). The equipment may also not be owned by the customer. Rather, the water treatment service companies may lease the equipment to the customer, or provide free-on-loan equipment, together with all chemical dosing and control functions, as part of their services to the facility. 

Additional capital costs for injection equipment will also be involved if it is thought necessary to dose one or both streams with additives to reduce the fouling problem. Consideration of on-line cleaning (see Chapter 15) such as the Taprogge system for cooling water, will also involve additional capital. It has to be said however, that on-line cleaning can be very effective and that the additional capital cost can often be justified in terms of reduced operating costs. 

Back-up batteries and battery charging equipment Condensate chemical dosing equipment Various tanks for storing chemicals Component cooling water pumps and heat exchangers Power supply for each reactor coolant piunp s variable-speed drive Secondary sampling system Annex Building... 

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