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5
Maintenance
A new tank installation should have a regular inspection program set up. The first inspection should be within the first three
months of operation. Once the tendency to accumulate sediment has been established, the inspection program can be modified
to suit the water conditions. Typical inspection programs flush the tank at six-month intervals and clean the tank in yearly
intervals.
Deliming solvents or acid type flush agents are not recommended for use in lined storage tanks. These chemical cleaners are
usually designed for use in non-potable systems such as heating boilers. These chemicals may be aggressive and cause damage
to the tank lining and deteriorate the magnesium anodes supplied in glass-lined storage tanks.
Hot water will be released under pressure. Avoid contact with the hot discharge water to prevent the risk of
WARNING
severe scald injury.
Flushing the storage tank
Since mineral accumulation occurs in an un-fired tank it
will be in a soft sediment form. This soft sediment can be
removed by a regular flushing of the lower portion of the
tank.
To flush the tank, follow these steps:
1.
Turn off electrical power to the circulating pump and any
other tank accessories.
2.
Close the valve on the hot water outlet on top of the
storage tank.
3.
Ensure that the drain located on the bottom of the tank
is routed to a floor drain with adequate capacity to allow
the tank to be flushed.
4.
Open the drain valve and allow the incoming cold water
to flush the soft sediment out the bottom of the storage
tank. Use extreme caution, as the water exiting the tank
drain may be very hot. Avoid contact with the hot
discharge water to prevent the risk of severe scald injury.
5.
Observe the color of the water initially discharged from
the tank drain. This water will generally be milky or
slightly discolored by the sediment discharge. Allow the
drain to run until the water runs clear.
6.
Close the drain valve on the tank.
7.
Open the hot water outlet valve on top of the tank.
8.
Open an adjacent hot water tap to purge any air that may
have entered the storage tank during the draining
process. Close the hot water tap if no air discharge is
observed.
9.
Turn on electric power to the circulating pump and other
electrical components if necessary.
10. Observe tank and piping to ensure all components are
functioning properly.
10
Storage Tank Installation and Operation Manual
Cleaning the storage tank
The mineral accumulation in an un-fired tank will be in a soft
sediment form that can be removed by a regular cleaning of
the lower portion of the tank. All Heat Pump Tank models
have a manway to allow access to the interior of the tank for
complete removal of accumulated sediment. An access opening
to remove the manway or inspection port is provided in the
exterior jacket. The sheetmetal jacket components are removed
with hand tools. The manway opening is located on the lower
portion of the storage tank (FIG. 5-1).
Figure 5-1_Vertical Tank
1-1/4" TEMP/PRESS
RELIEF VALVE TAPPING
ANODES
3" ANSI
FLANGE
3" ANSI FLANGE
THERMOWELLS
(x4)
MANWAY
DRAIN
DIR #2000595512 00
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