TapFlo PTL Series, Руководство пользователя

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7. ATEX supplementary manual
IOM manual Tapflo PTL Hose pumps
57
7.16. High negative suction pressure
Running a pump with obstructed suction port, closed valve and high pressure loses generated
by the installation, causes heavy strain on the pump hose and may result in pump surface
excessive temperature. Refer to the safety measures listed in the table below before starting
the pump.
Issue Safety measure
Obstructed suction port Check if the suction port is not obstructed
Closed suction vale Check if the suction valve is fully opened
High pressure loses
Keep the suction line as short as possible and ensure that the piping
diameter matches or exceeds the hose diameter. Pay attention for high
viscosity fluids, as the higher the viscosity, the higher the pressure loses.
Consult Tapflo for pressure loses calculation.
7.17. Drive
➢
To ensure proper service of the drive, follow the guidelines provided in the original
gearmotor’s IOM manual supplied with the. The gearmotor model can be found on its
nameplate.
➢
When reducing the motor rotation speed, it is important to monitor the surface
temperature of the gear-motor and ensure that it does not exceed the nominal working
temperatures specified by the gear-motor manufacturer. An optional external cooling
system may be required.
➢
The pump can be supplied with or without a gearmotor. When coupling the pump head
with a drive that was not supplied by Tapflo, it is important to follow the limits outlined in
section
7.2. Pump operating conditions .
➢
When changing the drive, it is obligatory to check if the drive speed is within the limits of
the pump allowable operating conditions.
➢
For proper gearmotor selection see separate appendix, the PTL flat pack manual appendix .
➢
To maintain the pump head ATEX marking, gearmotor must have at least the same ATEX
marking as pump head. PXT pumps are equipped with explosion-proof gearmotors that
meet the following requirements:
2G E … B Gb
2D E … IC T12 5°C Db
7.18. Earth connection of the pump and other equipment
Connect a suitable earth wire to the stainless steel earth connection that is placed on the
pump stand. Connect the other end of the earth wire to earth and also make sure that other
equipment like hoses/pipes/containers etc. are properly earthed/connected.
Required wire cross-
section area ≥ mm2.
7.19. Antistatic surface
Pumps in ATEX execution should be cleaned in order to preserve antistatic properties. Layer
of dust or other solid particles on the outer surfaces is unacceptable.