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Notes on Delivery and Suction Lines
Delivery Line - Effects on Flow Rate: Length and Diameter of Pipe, Flow Rate of Dispensed Liquid and
Accessories fitted, can create back pressures above those allowed. In this case, the Pump mechanical control
(bypass) will trip to reduce the Flow Rate.
How to Reduce Effects on Flow Rate: To avoid these problems, system flow resistances must be reduced
using shorter and/or larger diameter pipes, as well as line accessories with low resistances (ex. Automatic
Nozzle for higher Flow Rates).
Characteristics of Delivery Pipes: The delivery pipe must have the following technical characteristics:
• Recommended Minimum Nominal Diameter: 1" (25mm)
• Recommended Working Pressure: 45 PSI (3 bar). Max. Pressure: 100 PSI (7 bar)
Suction Line: Diaphragm positive-displacement Pumps are self-priming and feature good Suction Capacity.
During the start-up phase, when the Suction Pipe is empty and the Pump is wet, the Pump unit is able to suck
liquid from a Maximum Vertical Distance of 10 ft. (3m)
Note: Priming time can last a few minutes. We suggest performing priming operations without Automatic
Nozzle and making sure the Pump is properly wet.
Note: Always install a Foot Valve to prevent the Suction Pipe from being emptied and to keep the Pump wet
at all times. This would ensure the Pump will always start up immediately next time it is used.
Cavitation: The Pump is able to work with vacuums of up to 7 PSI (0.5 bar) at the Suction Mouth. Higher
pressure than 7 PSI (0.5 bar) can cause Cavitation, which causes a fall in Flow Rate and increase in Noise
Levels.
How to Prevent Cavitation: It is important to ensure low vacuums at the Suction Mouth by:
• Using Short Pipes with larger or identical diameter
• Reduce bends to utmost on the Pipes
• Using Large-section Suction Filters
• Using Foot Valves with minimum possible resistance
• Keeping the Suction Filters clean because, when they become clogged, they increase the
resistance of the system.
Note: The Vertical Distance between the Pump and the Fluid must fall within the 10 ft. (3m) maximum
required for priming. If the distance is greater, a foot valve must be installed to allow the Suction Pipes to fill
up and the diameter pipes must be larger. It is recommended that the Pump not be installed at a Vertical
Distance greater than 10 ft. (3m).
Note: If the Suction Tank is higher than the Pump, an Anti-siphon Valve should be installed to prevent
accidental product leaks. Size the installation to contain the back pressures caused by water hammering.
Note: It is a good practice to immediately install Vacuum and Air Pressure Gauges at the Inlets and Outlets
of the Pump which allow verification that operating conditions are within anticipated limits. To prevent the
Suction Pipes from being emptied when the Pump stops, a Foot Valve should be installed.
Characteristics of the Suction Pipes: The Suction Pipe must have the following Technical Specifications:
• Recommended Minimum Nominal Diameter: 1" (25mm)
• Recommended Nominal Pressure: 100 PSI (7 bar)
• Use Pipes suitable for low Vacuum Operation (e.g. with metal core)
Duty Cycle: The Pumps have been designed for intermittent use and a 30-minute duty cycle under conditions
of maximum back pressure.
Note: Functioning under by-pass conditions is only allowed for short periods of time (Max. 3 minutes).
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Piping Connections: Before making any Piping Connection, refer to the visual
indications i.e. arrow on the Pump head, to identify Suction and Delivery. The Pump
must never be Operated before the Delivery and Suction-lines have been connected.
Note: A Wrong Connection can cause Serious Pump Damage.
Preliminary Inspection:
• Before connection, make sure that the Piping and the Suction Tank are free of Dirt and any Solid Residue
that could Damage the Pump and/or its Accessories.
• Before connecting the Delivery Pipe, partially fill the Pump Body from the delivery side, with the liquid that
needs to be pumped in order to facilitate priming.
• Do not use Conical Threaded Fittings, as it could Damage the Threaded Inlet or Outlet Openings of the
Pump if excessively tightened.
Note: If not already fitted, fit a Suction Filter
Initial Start-Up: Check that the quantity of fluid in the Suction Tank is greater than the amount you wish to
transfer.
• Make sure that the Residual Capacity of the Delivery Tank is greater than the quantity you wish to transfer.
• Make sure that the Piping and Line Accessories are in good condition.
Warning: Toxic Fluid or Fumes Hazard
• Never Start or Stop the Pump by Connecting or Cutting-Out the Power Supply.
• Prolonged contact with some Fluids can damage the skin. The use of Safety Goggles, Mask and Gloves is
strongly recommended.
Note: Do not run the Pump dry for more than 2 minutes. This can cause serious damage to its components.
Fluid leaks can damage objects and injure persons.
Note: Extreme operating conditions with duty cycles longer than 30 minutes can cause the motor temperature
to rise thus damaging the motor. For each duty cycle of 30 minutes, allow for a rest phase of a minimum of
at least 30 minutes with motor switched off.
During the priming phase, the Pump must discharge all the Air that is initially present from the delivery line.
Therefore, it is necessary to keep the Outlet open to permit the Evacuation of the Air.
Note: If an Automatic-type Dispensing Nozzle is installed on the end of the Delivery Line, the Evacuation of the
Air will be difficult because of the Automatic Stopping Device that keeps the Valve closed. It is recommended
that the Automatic Nozzle be temporarily removed during initial Start-up.
If the Pump Does Not Prime: Depending on the system characteristics, the Priming phase can last from
several seconds to a few minutes. If this phase is prolonged, stop the Pump and verify that:
• The Pump is not running completely Dry (fill with Fluid from the Delivery line)
• The Suction Pipe guarantees against Air Infiltration
• The Suction Filter is not Clogged
• The Suction height is not higher than 6.5 ft. (2m)
• All Air has been released from the Delivery Pipe
At the End of the Initial Start-Up
When Priming has occurred, verify that the Pump is operating within the anticipated range, in particular that:
• Under conditions of Maximum Back Pressure, the Power Absorption of the motor stays within the values
shown on the identification label
• The Suction Pressure is not greater than 3 PSI (0.2 bar)
• The Delivery Back Pressure does not exceed the Maximum Back Pressure for the Pump.
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