Raypak Glass-Lined Storage Tank
Installation & Maintenance Procedures
Flushing the Storage Tank
NOTE: The information contained in this manual is
intended for use by qualified professional installers,
service technicians or gas suppliers. Consult your
local expert for proper installation or service proce-
dures.
Since the mineral accumulation is occurring in an un-
fired tank it will be in a soft sediment form. Much of this
soft sediment can be removed by a regular flushing of
the lower portion of the tank.
Installation
To flush the tank, follow these steps:
The water storage tank MUST be installed using di-
electric connections. Failure to do so will void the man-
ufacturer’s warranty. Installation of the tank without
dielectric connections can cause the rapid failure of the
storage tank due to electrolysis. For this reason, it is
imperative that dielectric connections be utilized.
1. Turn off the electricity and gas supply to the water
heater piped to the storage tank.
2. Turn off electrical power to the circulating pump.
3. Close the valve on the hot water outlet on the top of
the storage tank.
4. 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.
5. 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 con-
tact with the hot discharge water to prevent the risk
of severe scald injury.
6. Observe the color of the water initially discharged
from the tank drain. This water will generally be
milky or slightly discolored by the sediment dis-
charge. Allow the drain to run until the water runs
clear.
7. Close the drain valve on the tank.
8. Open the hot water outlet valve on the top of the
tank.
The tank should be installed in such a manner that
should the tank or any of its connections leak, the re-
sulting flow of water will not cause damage.
Follow the Dielectric Protection instructions in these
procedures to verify that the dielectric connections are
installed properly. If electrical continuity exists between
the tank and its piping, the connections MUST be
fixed.
Maintenance
A new tank installation should have a regular inspec-
tion program set up initially. The first inspection should
be within the first three months of operation. Once the
tendency to accumulate sediment has been estab-
lished, 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.
9. 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.
10. Turn on electric power to the water heater and cir-
culating pump.
11. Turn on the gas supply to water heater.
12. Observe heater and piping to ensure all compo-
nents are functioning properly.
Deliming solvents or acid type flush agents are not rec-
ommended for use in lined storage tanks. These
chemical cleaners are usually designed for use in non-
potable systems such as heating boilers. These chemi-
cals may be aggressive and cause damage to the tank
lining and deteriorate the magnesium anodes supplied
in Raypak glass-lined storage tanks.
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. Many tanks
will have a hand hole or a larger manway to allow ac-
cess to the interior of the tank for complete removal of
accumulated sediment. The opening will be in the bot-
WARNING: Hot water will be released under pres-
sure. Avoid contact with the hot discharge water to
prevent the risk of severe scald injury.
CATALOG NO. 4000.50B
Effective: 12-01-08
Replaces: 06-02-08
P/N 241355 Rev. 1
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