MDX [en-US]
25
7
Maintenance
WARNING
Refer to Section 2.9 "Assembly & Disassembly Safety" prior to working on the pump.
7.1
Supervision of Operation
WARNING
Operational procedures which may cause system water hammer must be avoided. Sudden and
catastrophic failure of pump casing and plates may result.
Prolonged operation against a closed shut-off element is not permitted. Danger of steam generation
and explosion!
CAUTION
Neglect of maintenance procedures and monitoring can result in failure and leakage of the shaft seal,
bearing seals, and wear components.
The pump should run quietly and free from vibrations at all times. Unusual noise or vibration should be
investigated and corrected immediately.
If the flexible coupling elements begin to show signs of wear, they should be replaced.
When running the pump against a closed discharge-side shut-off element for a short period, the permissible pressure
and temperature values must not be exceeded.
Verify the oil level is correct.
The gland packing (if the pump is fitted with one) should drip slightly during operation. The gland should only be gently
tightened.
Any stand-by pumps installed should be switched on and off again as described in Section 6.3.1 "Measures to be taken
for Prolonged Shutdown".
7.2
Drainage / Disposal
CAUTION
If the pump was used for handling liquids posing health hazards, see to it that there is no risk to persons or the
environment when draining the medium. All relevant laws, local codes, and safety procedures must be heeded.
If required, wear safety clothing and a protective mask.
If the media handled by the pumps leaves residues which might lead to corrosion when coming into contact with atmospheric
humidity, or which might ignite when coming into contact with oxygen, the unit must be flushed thoroughly and neutralized.
The flushing liquid used and any liquid residues in the pump must be properly collected and disposed of without posing any risk
to persons or the environment.
7.3
Lubrication and Lubricant Change
Under severe operating conditions, high ambient temperature, high humidity, dust laden air, aggressive industrial atmosphere,
etc. the intervals for checking, replenishing and replacing the lubricant should be shortened.
Refer to Section 6.1.1 "Bearing Lubrication" for bearing oil change instructions, specifications & capacities.
The oil should be drained and replaced every 3 to 4 months or when it appears or is suspected of being dirty or
contaminated.
7.3.1
Underwater Operation
Bearing assemblies for use underwater should be completely filled with oil and slightly pressurized by an oil recirculation and
filtering system. As a result, their capacities will be several times greater than detailed in Section 6.1.1 and a thinner oil will be
required. Depending upon the water temperature at the location at which the pumps are operating, the ISO viscosity grade
should be altered as follows for mineral oil-based lubricants:
For more information on Underwater Bearing Assemblies see Section 6.5 "Underwater Pump Operation"
Summary of Contents for GIW MDX
Page 53: ...MDX en US 53 14 Notes...
