GEC Floating electrode Steam Raiser User Guide

GEC Floating electrode Steam Raiser User Guide
FLOATING ELECTRODE STEAM RAISER
Cat. No.
Maximum Load 20 kW.
H.O.4980
Maximum Working Pressure 15 lbs. per sq. in.
MADE IN ENGLAND.
PRESSURE GAUGE
SOLUTION FUNNE
FIXING SCREW “A”
NEUTRAL SHIELD
FLOAT
EARTH CONN
WATER INLET AND DRAI
SAFETY VALVE
STOP VALVE
SWITCH
Ш
TER GAUGE
ELECTRODES
CABLE GLAND
EARTH SCREW
FLOATING ELECTRODE STEAM RAISER
INSTALLATION.
Unbolt and take off top cover of steam raiser, and
remove all packing material from interior. Connect water
supply to horizontal inlet on 3-way valve. Mount control-
gear on wall and connect incoming mains and outgoing
flexible cable in accordance with wiring diagrams provided
with control panel. If a pressure switch is not fitted, make
sure that the appropriate terminals in control panel are
connected together. If dash-pots are fitted to overload
trips fill them with the correct grade of oil. Set overload
trips at 25% above normal full load at which steam
raiser is to operate. Make sure that both internal and
external connections are securely made.
STARTING UP.
With the top cover off, half fill the steam raiser with
water and turn off the cock. Make sure that the electrode
assembly floats freely and level in the water. With the
cover still removed, switch on the current by means of the
switch on the control panel. The current will be indicated
by the ammeter and will increase rapidly as the water
heats-up, finally remaining steady when the water around the
electrodes boils. This will take only a few minutes. The
position of the electrodes in the float must then be adjusted
until the current is about 90% of the desired maximun
value. To adjust the electrodes, switch off the current and
slacken the three fixing screws (A). Then raise or lower
the electrodes and neutral shield inside the float. Raising
the electrodes will decrease the current taken and lowering
them will increase it. Switch on again and observe the
current. Repeat the procedure until with the water boiling
the current is 90% of the desired value. The fixing screws
(A) should then be tightened and the top cover bolted on.
When operating under pressure, the current will rise slightly
above the value obtained with the steam raiser open, so
giving the desired load. Ifa pressure regulator is fitted, set
it to the required working pressure and adjust the
differential. The maximum load of 20 kW. is obtained
on 400V. three phase with a current of 29 amps.
If the requisite current cannot be attained, refer to
“Special Conditions ” overleaf.
ALWAYS DISCONNECT THE ELECTRICITY SUPPLY BEFORE CARRYING OUT ADJUSTMENTS.
FLOATING ELECTRODE
STEAM RAISER
(Continued)
OPERATION.
Fill the steam raiser with water until the level in the
gauge glass is about 2 inches from the top. Switch on and
the full output of steam will be obtained in a few minutes.
The steam raiser will operate for about 1 to 13 hours before
requiring refilling with water. To shut down simply open
the switch of the control panel. With some water,
due to the precipitation of salts during evaporation,
the current may increase above the desired value.
The steam raiser should then be completely drained
dnd refilled with fresh water. In some instances to
obtain stable working conditions it will be necessary
to drain under pressure after each operation.
When working with the steam outlet fully open and
no external back pressure, the pressure on the gauge may
fall to 1 Ib. per square inch or less. As the steam raiser
gives constant evaporation at all times, it will give a
satisfactory performance, providing the pressure is sufficient
to drive the steam to where it is required. Higher pressures
are not required, and may be detrimental to efficient
sterilizing and damage rubber components. ‘To obtain the
maximum evaporation at all times, the float should be
adjusted to give the maximum evaporation at the lowest
pressure which will give a satisfactory performance.
It is misleading to make comparisons with fuel-fired
steam raisers, which work at high pressure to provide a
reserve to deal with fluctuations in firing. Such high
pressures quickly fall when a steam raiser is working on
full output.
MAINTENANCE.
When used with hard water periodical de-scaling will be
necessary, the nature of the water determining how often
this must be carried out. The scale will be found to
accumulate chiefly on the electrodes and neutral shield and
may be removed by scraping or employing a de-scaling
solution. The contacts of the control panel should be
inspected from time to time, and if showing signs of
burning should be cleaned with a smooth file. A few
drops of light machine oil should be applied occasionally
to the bearings of the contactor switch.
SPECIAL CONDITIONS.
The steam raiser is suitable for use with the majority
of water supplies. In certain districts, the nature of the
water gives rise to conditions requiring special treatment.
Should it be found that the desired value of current cannot
be obtained even though the electrodes are lowered to their
fullest extent, a small quantity of common salt should be
added to the water to increase the current. This should be
Introduced through the filling cup and only sufficient—usually
a teaspoonful—to give the desired load should be added.
Should the required load or more than the required load be
obtained even though the electrodes are raised to their fullest
extent, special small diameter electrodes can be supplied. If
satisfactory results cannot be achieved a sample of the water
(about 1 quart) in a clean sterile bottle should be sent
to the G.E.C. for testing.
ALWAYS DISCONNECT THE ELECTRICITY SUPPLY
BEFORE CARRYING OUT ADJUSTMENTS.
rer rt arr
Head Office :
Telephone : TEMple Bar 8000 (90 lines).
UI
Wholesale only
THE GENERAL ELECTRIC CO., LTD.
MAGNET HOUSE, KINGSWAY, LONDON, W.C.2.
Cablegrams : “ Polyphase, London.”
Branches throughout Great Britain and in all the principal markets of the world.
Telegrams : “ Electricity, Westcent, London.”
MOON рановато оеньа-еата овен
H.0.9775. Revised June, 1948.
Printed in England. HS
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