SPX Waukesha Cherry-Burrell Votator II, Руководство по эксплуатации и обслуживанию

Страница: 42 / 84

Maintenance Waukesha Cherry-Burrell
Page 42 95-03057 October 2005
Mechanical Seals
Votator II heat exchangers are equipped with single or
double mechanical seals at each end of the mutator shaft.
NOTE:
Double mechanical seals MUST BE flushed to
prevent seal faces from over heating.
Mechanical seal faces with nicks, blisters, grooves, or any
abnormality on the seal face, must be replaced. Elastomers
that are brittle, deformed, cut, or have any abnormality
must be replaced. It is an excellent practice to replace all
elastomers and gaskets whenever maintenance is
performed.
Tubes
A frequent cause of tube wall damage is careless handling
when removing or installing the mutator shaft. The shaft
trough skid should always be used when removing or
installing the mutator shaft in the Horizontal Votator II (or
the Vertical unit if in a horizontal position) to prevent the
blade mounting pins from scoring and damaging the tube
wall.
A common way to damage tube ends is to bang or drop the
shaft journals when removing or inserting the shaft.
Tubes should be examined for wear anytime the shaft is
removed or at least once every 3 months. Chrome plated
tubes should be inspected for flaking of the chrome.
Normally, tubes will develop phonographic patterns from
blade contact and rotation; this phonographic pattern is
generally visible to the eye but is not significant unless
detectable by touch. Scoring is significant when the base
metal has been damaged; roughness of the tube wall is
obvious both visually and by touch. A badly scored tube
will make cleaning more difficult, reduce heat transfer,
result in poor performance and increase blade wear.
Re-conditioning the tube is the only way to restore
performance. If there is suspicion that scoring has
penetrated the tube wall, the unit can be pressure tested by
turning on the jacket media and observing the inside of the
tube for leaks.
Tubes should be removed every 12 to 18 months for
cleaning debris from the media side. Jacket side O-rings
should be replaced when tubes are reinstalled.
Care of Heat Exchanger Tube
NOTE:
Repair work must be performed by a shop with
ASME certified welders. The heat exchanger tubes are
ASME coded parts. Failure to get repairs done by an
ASME coded machine shop with certified welders will
void the warranty and possibly void insurance. SPX
Process Equipment has all required certifications
necessary for repair of ASME coded parts.
Product Side
The heat exchanger tube is designed to last a long time
with little maintenance.
If tubes wear out prematurely, one or more of the
following may be the cause:
• Failure to use shaft trough when removing mutator
shaft will cause scratching or gouging of tube wall.
• Careless assembly and installation of blades.
• Rotating shaft without product or product flow.
• Use of the wrong detergent or incorrect use of a
detergent.
• Starting shafts against stiffened or solidified product
in tubes.
• Starting the flow of jacket media (Ammonia, Freon,
Steam, Water, etc.) before establishing full product
flow under operating pressures.
• Failure to clear tubes of product after every use.
• Starting operation before dissolving particles such as
salt, sugar, detergents, etc.
• Using dull blades or blades that have been sharpened
below minimum width specifications.
• Using blades other than those furnished by Waukesha
Cherry-Burrell.
• Worn mutator shaft bearings.