Xylem NPOPTM NPO Product Training Manual - Manual (Page 17)

PAGE 17
Commercial Water
Goulds Water Technology
Since most of the profit for such companies needs to be made on the initial sale of the washer, cost of manufacture
is much more important than it would be to the chemical company. Despite this, these companies are good pros-
pects for an NPO, because it gives them a competitive advantage. Almost all dishwasher pumps are presently cast
iron. Some manufacturers have put in plated or stainless impellers to try to improve pump life, but until now, the
cost of a completely stainless pump was much too high to justify in this application. The NPO is the first completely
stainless pump to meet the performance and solids handling need and still be within the general cost range of cast
iron bronze fitted pumps. Key benefits of the NPO are:
— The all stainless design of the NPO gives these companies a competitive advantage since stainless is
much more resistant to the detergents and chlorides used in dishwashing.
— Pump maintenance time and costs are reduced.
— Overall system costs/market prices can be kept in line while growing market share.
— All of the other benefits of the NPO covered for the chemical companies on the previous page.
TYPICAL DISHWASHER DESIGN
Most commercial dishwashers are open stainless steel cabinets designed to accommodate standard sizes of dish-
washer racks. One or more spray wands are located at the top or bottom of the cabinet and a drain is at the bot-
tom.
The dishwasher runs in two cycles: detergent wash and clean water rinse. Often, the rinse water is reused with de-
tergent for the next machine cycle. Water temperature is 140º – 180º F and may be heated internally or by another
source in the building. The cost of hot water is important to operation, which is why the rinse water is reused.
Due to the electrical power normally found in a restaurant and the humid conditions inside the washer cabinet, a
single phase 115V motor with solid state switch is often used.
DISHWASHER MARKET