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Salt water pools and spas at Mount Maunganui, New Zealand
where a Grundfos SPN pump draws up geothermal water and
salt water.
“We can’t afford to experiment,” says Director
of H2O Management
Limited, Peter McNamara. “There was no argument. We
automatically
chose Grundfos for all our pumps.”
“The fact that two successive Grundfos SPN pumps with
MS motors
have operated under unreasonable conditions for 13 years without
cause for complaint is testimony to their operational characteristics.
They have needed virtually no maintenance or repairs.”
H2O Management manages and operates the unique and highly
popular
Mount Maunganui Hot Salt Water Pools, situated on a narrow
peninsula below the mountain of Mauo in New Zealand’s
Bay of
Plenty. The complex is vast and incorporates a large free-form
pool,
lap pool, a toddlers’ pool, three private indoor spa
pools and two large
outdoor public spa pools. These facilities provide a relaxing
and therapeutic
interlude for 400,000 people every year.
Heat loss from the outdoor pools is a very important variable
in the operation
of the plant. Adverse weather conditions can quickly precipitate
a
drop in the temperature of the bathing water. The pumping
and heating
system must be able to respond rapidly and efficiently in
order to maintain
bathers’ comfort levels.
Highly corrosive cocktail
Seawater is pumped in through a 350-metre pipeline and heated
via a heat exchanger by a mixture of geothermal water and
hot saltwater pumped from a 167-metre borehole.
A Grundfos SPN pump and MS motor draws up the highly corrosive
geothermal water and saltwater, which comes out of the ground
at more than 50 degrees Celsius. The heat exchanging system
brings the temperature of the seawater used in the pools
up to a very comfortable 38 degrees Celsius.
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SPN
IS HOT STUFF IN THERMAL WATERS |
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