Open cooling system cleaning

As with cleaning closed-loop systems, it is always necessary to first identify the basic types of foulants and problems likely to be found in any new open cooling system and to then select both an appropriate chemical treatment and a cleaning process. 

The drive was kept simple and takes the form of a multistage condensing turbine in which considerable effort was made to provide for on-line maintenance. The main trip and throttle valves can be exercised without disturbing the operation and the main condenser, which can be cleaned on the waterside without shut down of the machine. This is very useful to combat fouling from marine growth in the cooling system which of necessity must be open to the atmosphere. 

Pollution Abatement System Plugged Problems with the deactivation furnace s pollution abatement system resulted in 96 hours of lost production. The purpose of the pollution abatement system is to cool and clean the exhaust gases produced in the deactivation furnace. The major problem with the system was that sodium salts and rust plugged two components of the system. The plugging reduced the opening for the exhaust gases from 24 inches to 6 inches, which required additional maintenance. A clean-out plate has since been added to the ducting. 

While ferric ion inhibitors are important in many cleaning processes, they are essential to clean open cooling water systems. If the cooling tower in such systems... 

Uses Water treatment formula to prevent buildup of min. scale and to control corrosion in industrial water circuits mainly used in open cooling water systems incorporated additive controls growth of algae and slime bacteria contains no biocides dispersant and cleaning effects protection against corrosion of steel, copper, and copper alloys stabilization of hardness forming salts even at high water temps. 

The elements of a PM plan include periodic inspection, cleaning, and service as warranted, adjustment and calibration of control system components, maintenance equipment and replacement parts that are of good quality and properly selected for the intended function. Critical HVAC system components that require PM in order to maintain comfort and deliver adequate ventilation air include a outdoor air intake opening, damper controls, air filters, drip pans, cooling and heating coils, fan belts, humidification equipment and controls, distribution systems, exhaust fans. 

See also Chapter 9, Section 4, and the notes on Process Contamination in Section 10.8.28). Techniques for the on-line cleaning of open recirculating cooling water systems are often similar to those for preoperational cleaning in that generally there is a two-stage approach ... 

Power consumption and space requirements are generally less than for an alr-cooled or a cooling tower, cycle-water system. When compared to an open cycle, the water requirements are less than 5% of a sensible heat system this results in smaller pumps and lower piping costs. The water side of evaporative-cooled equipment can be easily inspected and cleaned (if necessary) while the unit is In service. 

NaK was then forced from the lower pot into the quench tank up to approximately 1 in. from the top. The NaK in the quench tank next was heated to temperature. The stopper rod reciprocating automatic drive was finally switched on (unless operated manually), and the shotting process proceeded automatically until the stopper rod piston had forced all of the melt out of the nozzle. After the NaK had cooled to room temperature, it was forced back into the lower hold pot through a small screen at the base of the quench tank. The system was then opened and cleaned of NaK with ethyl alcohol and water rinses. The balls were taken from the bottom of the quench tank through the hex nut sealing device. 

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