Flowserve N-Series Worthington - Manual (Page 6)

N-SERIES OF THRUST POT USER INSTRUCTIONS ENGLISH 07/14
Page 6 of 20
installed in different hazarous atmospheres. In this
case the user is responsible for ensuring that the
pump surface temperature does not exceed that
permitted in the particular hazardous atmosphere.
If an explosive atmosphere exists during the
installation, do not attempt to check the direction of
rotation by starting the pump unfilled. Even a short
run time may give a high temperature resulting from
contact between rotating and stationary components.
Where there is any risk of the pump being run against
a closed valve generating high liquid and casing
external surface temperatures, fit an external surface
temperature protection device.
Avoid mechanical, hydraulic or electrical overload by
using motor overload trips, temperature monitor or a
power monitor and make routine vibration monitoring
checks.
In dirty or dusty environments, make regular checks
and remove dirt from areas around close clearances,
bearing housings and motors.
1.6.4.4
Preventing dry running
ENSURE THAT THE THRUST POT IS
PROPERLY FILLED ANS DOES NOT RUN DRY
Ensure that the oil level is as per section 3.1.4.
The bearing temperature shall be monitored by
means of a PT 100, surface contact type.
1.6.4.5
Preventing sparks
To prevent a potential hazard from mechanical
contact, the coupling guard must be non-sparking.
To avoid the potential hazard from random induced
current generating a spark, the baseplate must be
properly grounded.
Avoid electrostatic charge: do not rub non-metallic
surfaces with a dry cloth ; ensure cloth is damp.
For ATEX application sthe coupling must be selected
to comply with 94/9/EC. Correct coupling alignment
must be maintained.
1.6.4.6
Maintenance to avoid the hazard
CORRECT MAINTENANCE IS REQUIRED TO
AVOID POTENTIAL HAZARDS WHICH GIVE A
RISK OF EXPLOSION
The responsibility for compliance with maintenance
instructions is with the plant operator.
To avoid potential explosion hazards during
maintenance, the tools, cleaning and painting
materials used must not give rise to sparking or
adversely affect the ambient conditions. Where there
is a risk from such tools or materials, maintenance
must be conducted in a safe area.
It is recommended that a maintenance plan and
schedule is adopted. (See section 4.0,
Maintenance.)