Pumptec 356U SERIES - Manual (Page 5)

5 Version 061113
Pumptec Operating Instructions and Parts Manual PUMP SERIES 348U | 350U | 356U
The advantages of an injector are:
Fewer items touching chemical, the chemical injection rate
can be controlled, and applying chemical at lower pressure
increases chemical use efficiency.
HEAtiNg FLUiD
The pumps may sometimes be used with downstream heaters
and precautions need to be taken to protect the system and
persons from harm. Refer to the skilled staff at the equipment
manufacturer for guidance and proper system care. Please
be aware that heated water expands and additional pressure
release safety devices may be required.
SyStEm DESigN
A pump is the heart of every system and proper selection is
critical to equipment function and durability. If a pumping set
with excess flow is chosen, then energy and fluid is wasted.
If excess pressure results, then equipment effectiveness can
decrease and so can pump life.
tyPiCAL APPLiCAtiONS AND tHEir
PErFOrmANCE CONSiDErAtiONS
PRESSURE ClEAnIng
The optimal combination of PSI and gPM for cleaning is a ratio
of 1 gPM for every 300-400 PSI. This combination maintains
sufficient droplet size for cleaning force and distance. If the
flow is increased without an increase in pressure, the cleaning
impact does not increase with the increased use of fluid. If
pressure increases, and flow does not, then the water droplet
size reduces and has less impact force, requiring closer cleaning
distances and increased risk of surface damage.
PEST SPRAYIng
This application can have specific chemical usage requirements
and application pressure limits, so use the included information
as a guide only. Refer to label requirements for each specific
chemical.
lInE lOSS
When choosing a pump for spraying, pressure loss in the hose
must be considered. The pressure is greatest at pump and
decreases over the length of the hose. Typically, these systems
utilize very long hoses, 200-300 ft. is common, and requires
a certain minimum amount of performance to move the flow
through the lengths of hose. For example, a 3 gPM system will
require (lose) 50 PSI per 50 ft. of 3/8” ID hose. A pump with
only 60-70 PSI may not provide the desired performance at the
end of the hose. See reference charts to assist in system design.
MISTIng
It is critical to size the pump correctly in a misting application. If
insufficient flow is chosen, then proper atomization and droplet
size will not result. If excessive flow is chosen, then unnecessary
wear and wasted energy will occur in this very demanding
application. Refer to the nozzle Performance Chart for your
chosen nozzles to determine the required total flow at desired
pressure. For example, if 1000 PSI is desired from 20 pieces of
‘08 misting nozzles, then a minimum flow rate of 0.4 gPM is
required. Allowances need to be made for losses from tubing
lengths and fittings, too. It would be unwise in this situation to
choose a 0.75 or 1.0 gPM pumping system.
Another consideration for misting concerns the routing of the
bypass fluid. DO nOT return bypass fluid from regulating valve
directly back to inlet of pump. The returned fluid will contain
large amounts of air bubbles that will cause cavitation and
damage in the pump head. Also, the small amount of returned
fluid can heat up rapidly and lead to further cavitation and
component damage. It is recommended to route bypass back
to inlet of filter to allow air bubbles to dissolve and water to
cool prior to entering pump.
The pumps are shipped assembled to a custom-made
motor based upon your specifications. It is not necessary to
order a motor separately. Communicate your specification
requirements and the supplier will assist with pump options.
Please use the following charts as a guide to understand the
basic system requirements.
nOTE: nozzle sizes in the performance chart are additive. For
example, 2 pieces of ’02 nozzle equals the performance of 1
piece of ’04.
nozzles create restriction (pressure) in the system. If unsure
of the nozzle size needed for desired performance, refer to
nozzle Performance Chart. If you are sure of your nozzle
size, but unsure of which pump set to choose, then use the
nozzle Performance Chart along with the Horsepower Chart to
determine your required pump specification.
An example of how to use these charts together: when you
have 2 pieces of an ’02 nozzle and you want 500 PSI, the nozzle
Chart will tell you that 2 pieces of an ’02 nozzle has a flow equal
to 1 piece of an ’04 nozzle. At 500 PSI, an ’04 nozzle has a flow
of 1.4 gPM. The performance specification is 1.4 gPM at 500
PSI.
The Horsepower Chart indicates that 1.4 gPM at 500 PSI
requires .408 HP. You will need to select a pump set that can
perform at this level. Refer to page 6.