Maintenance; Introduction; General Safety Precautions; Planned Maintenance - Zenit UNIQA Manual De Primera Instalación

better together

7. MAINTENANCE

7.1 Introduction

Zenit UNIQA electric submersible pumps undergo through final inspection before they are offered for sale.
The product's reliability derives from the use of top quality components but also depends on regular inspections which must be carried out by
the user.
warning!
The instructions for inspection and maintenance of these pumps must never be viewed as "Do-It-Yourself" procedures;
they require specific technical knowledge.
NOTE: The inspection and replacement of spare parts require specialized equipment. To have this operation performed, contact the dealer
where this equipment was purchased, or the ZENIT sales office in your area.
Any interventions of the pump in -EX versions must be carried out by an authorised Service Centre or by authorised techni-
cians using only original spare parts. Failure to comply with this rule causes loss of -Ex approval.
A service and planned maintenance contract with the Zenit Authorised Service Centre guarantees the best technical service. The Zenit warranty
is only valid if repairs and reactive maintenance are performed by an Authorised Service Centre.

7.2 General safety precautions

Take the precautions detailed in the "Safety Precautions" manual.
•
Before cleaning and/or maintenance procedures, a skilled technician must disconnect the pump from the power supply and ensure that it
cannot start up accidentally. Always disconnect the phase wires first and then the yellow-green ground wire.
•
Ensure that the pump cannot fall or roll, causing injury or damage.
•
Wash the surface of the pump thoroughly with clean water and/or specific detergent before doing any work on it.
•
After prolonged use, the surface of the pump may become very hot: allow it to cool sufficiently to avoid burns.
•
Always comply with the safety regulations in force in the place of installation, any local regulations and the dictates of common sense.

7.3 Planned maintenance

Maintenance intervals depend on the type of installation, the workload to which the pump is subjected and the type of liquid in which it is immer-
sed.
During planned maintenance or in any circumstances when the pump's performance deteriorates or its vibrations and noise level increase, the
parts subject to wear and tear must be inspected; have this done by an Authorised Service Centre.
Do not use the pump if malfunctioning because sudden failure of the rotating parts may cause hazardous situations or damage to the motor.
For machines subject to -Ex certification, schedule a maintenance plan with a maximum interval of 2 year or 9,000 hours
continuous opeation (which ever comes first) for electric pump re-conditioning, which includes changing the bearings and the
mechanical seals.
A six-month control is also recommended to check the wear of the bearings, the mechanical seals and all other parts subject
to wear, as particularly adverse or incorrect installation conditions can lead to explosion risk.
Defective bearings may reduce the -Ex safety.
For replacement purpose, the fasteners shall be Class A2 70, A2 80, A4 70 or A4 80
If the pump is used only occasionally, after each use flush out the hydraulic part to prevent the formation of deposits; run the pump for a few
cycles with clean water.
Also take care not to allow sediments to form on the float switches, to ensure that the start and stop thresholds remain correct.
First installation manual – Translation of original instructions
EN
43