Xylem GOULDS Marlow 20EVP Serie Manuel D'instructions page 3

CONGRATULATIONS
You are now the owner of a Goulds Water Technology
pump. This pump was carefully inspected and subjected
to final tests before releasing for shipment. In order to
assure maximum performance, please follow the simple
instructions in this manual.
RECOMMENDED PRECAUTIONS
1. Avoid system pressures that may exceed the maxi-
mum working pressure of the pump.
2. Should the fluid temperature rise more than 50ºF.
above ambient, expansion joints must be installed on
both the suction and discharge ports to relieve any
stress on the pump casing.
3. All electrical wiring of the pump installation must be
done by a licensed electrician who will observe all
national and local electrical codes. All motors require
a magnetic starter with current overload protection.
4. No modifications, additions or deletions should be
made to the pump, without prior approval of the
factory.
5. In systems where shock wave pressures may be gener-
ated, protective devices such as check valves/gate
valves, etc., must be installed on the discharge line
to prevent shock pressures from entering the pump
casing.
6. In systems containing discharge check valves, gate
valves, etc., the pump will not prime against a closed
valve. Check the discharge valves making sure they
are open before attempting to prime the pump. If
there is a possibility of air being entrapped in the
pump casing, install an automatic venting device to
bleed off the air.
7. This pump is designed primarily for water use. Before
pumping other liquids, read carefully the CAUTION
below.
8. Overheated pumps are dangerous. Burns or explosion
could occur due to steam pressure. Operating pumps
with suction and discharge closed is one cause of se-
vere overheating. If overheating of the pump occurs:
1. Stop pump immediately, 2. Allow pump to cool, 3.
Slowly and cautiously vent pump.
9. Drain casing completely when servicing pumps han-
dling volatile or harmful liquids.
10. Do not use in a combustible atmosphere.
11. Make daily checks of the tightness of suction and
discharge pipe, drain, filter plug and pump gaskets.
Operation should not proceed until all of the above
items have been checked and are tight.
12. After servicing the pump, always install the coupling
guards, belt guards and other safety devices as origi-
nally found prior to disassembly.
The performance of Goulds Water
CAUTION
Technology are based upon clear, cold,
fresh water with suction conditions as shown on the
performance curve. If used to pump other liquids, pump
performance may differ from rated performance based
on the different specific gravity, temperature, viscosity,
etc. of the liquid being pumped. A standard pump may
not be safe for pumping all types of liquids, such as toxic,
volatile or chemical liquids, or liquids under extreme
temperatures or pressures. Please consult your Goulds
Water Tehcnology catalog as well as local codes and
general references to determine the appropriate pumps
for your particular application. Since it is impossible
for us to anticipate every application of a Goulds Water
Tehcnology pump, if you plan to use the pump for a
non-water application, consult Goulds Water Tehcnology
beforehand to determine whether such application may
be proper or safe under the circumstances. Failure to do
so could result in property damage or personal injury.
OPERATING INSTRUCTIONS
GENERAL
• Our shipping container has been specifically designed
to prevent transit damage. However, any indications
of damage or shortage should be carefully noted on
the delivery ticket and a claim filed promptly with the
carrier.
PROPER LOCATION
• By placing your pump on a firm, level foundation or
between firmly supported pipelines, you reduce harm-
ful vibrations and unnecessary noises.
• While EV series pumps are self-priming and may be
located above the source of liquid supply, best pump
operation is obtained by locating the pump as close as
possible to the liquid being handled, keeping in mind a
pump can push liquid more effectively than it can pull
or draw liquid. Provide the necessary space around the
pump for future inspection and servicing of the unit.
PIPING
• All piping should be independently supported to elimi-
nate excessive strain on the pump. Avoid unnecessary
friction losses. Keep your piping as short as possible
and use the fewest possible elbows and fittings. Pipe
joint compound that will not dissolve in the liquid
being pumped should be used on all joints. Gate valves
combined with unions or flanges, on both sides of the
pump, will facilitate pump removal without disturbing
the piping. It is occasionally advantageous to use suc-
tion pipe one size larger than that for which the pipe
is fitted. Eccentric reducers should be used to change
pipe sizes.
STRAINER ADVISABLE
• Protect your investment. Install a strainer on the suc-
tion line. This will eliminate clogging of the pump,
poor performance and excessive wear. A 16 mesh
strainer submerged one foot below the liquid level is
adequate for EV series pumps. In-line strainers are
available from your Goulds Water Technology dealer.
Piping that has a continuous rise will facilitate draining
the system.
VALVES
• Install a check valve on the discharge side of the pump.
This will prevent high surge back pressures from
damaging the pump. If the pump is disconnected this
check valve will prevent the liquid from draining the
discharge line.
• Some installations may require the throttling of the
pump. Gate valves may be used on the discharge side.
Place the check valve between pump and gate valve.
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