7
Protection Control
A power monitor, flow switch, pressure switch or similar device must be used to protect against dry running, closed discharge valve or
decoupling. Any of these conditions could lead to a rise in surface temperature of the pump.
Construction Materials
Pump must be manufactured from PVDF with a PVDF motor adapter and bronze bump ring and have the designation “-A” in the pump
part number. The PVDF contains conductive carbon which allows it to be grounded when installed in a properly grounded piping system
or when a properly installed grounding strap is attached to a housing bolt. The bronze bump ring is pressed into the clamp ring or motor
adapter and prevents sparking should the motor bearings fail and the outer drive magnet runs out of round.
Grounding
Static sparking can cause an explosion. When operating in a hazardous area or pumping a hazardous fluid the entire pump system must
be grounded to prevent static discharge. Before operating the pump, ensure the electrical continuity throughout the pumping system
and earth ground is 1 Ohm or less. If greater than 1 Ohm, re-check all grounding connections.
Elastomer Selection
Proper o-ring material must be chosen for the fluid being pumped. Improper material selection could lead to swelling and be a possible
source of leaks. This is the responsibility of the end user.
Leaks
The pump must be checked for leaks on a regular basis. If leaks are noticed, the pump must be repaired or replaced immediately.
WARNING:
Risk of explosion. When using an MSDB in an ATEX application, the following methods must be applied:
• Fluid being pumped must be conductive (soluble in water)
• DO NOT use to self-prime
• DO NOT run the pump dry
Temperature Classification
The surface temperature of the DB Series pumps depends upon the temperature of the fluid that is being pumped. The following chart
lists different fluid temperatures and the corresponding pump surface temperature.
Fluid Temperature
Maximum Surface Temperature Temperature Class Maximum Allowable Surface Temperature
21ºC (70ºF)
51ºC (123ºF)
T6
85ºC
77ºC (140ºF)
77ºC (171ºF)
T5
100ºC
104ºC (220ºF)
99ºC (211ºF)
T4
135ºC
Cleaning
The pump must be cleaned on a regular basis to avoid dust build up greater than 5 mm. Clean the pump’s exterior only using a damp
non-static cloth.
Motor Rotation Test
Pump must be full of liquid with no trapped air in the suction and discharge lines before the rotation of the motor is checked. Do not
operate pump until it is full of liquid.
Start up
The pump must be filled from a flooded suction tank (gravity) or primed with liquid from an outside source. Open the inlet (suction) and
dis- charge valves completely and allow the pump to fill with liquid. Close the discharge valve. Turn the pump on and slowly open the
discharge valve. Adjust the flow rate and pressure by regulating the discharge valve. Do not attempt to adjust the flow with the suction
valve.
Maintenance
The recommended maintenance schedule depends upon the nature of the fluid being pumped and the specific application. If the pump
is used on a clean fluid, it is recommended that the pump be removed from service and
