World Grain - November 2009 - 74
FEEDOPERATIONS
Maintenance -
the often
forgotten items
Steam, compressed air and exhaust
systems are easy to overlook
by Jonathan Bradshaw
Editor's note: This is the final article in a three-part series that examines maintenance issues in feed mills. The
first appeared in the September issue of World Grain and
examined maintenance issues related to intake and grinding equipment. The second article appeared in the October
issue of World Grain and examined issues related to mixing
and pelleting.
Compressed air, steam, general exhaust systems and good
practice in maintenance planning matters are items that most
maintenance engineers forget about when putting together
their wish list for capital expenditures at the start of the fiscal year.
Dry steam in the right volume enables feed millers to deal
with the vagaries of several fibrous raw materials that create
problems if they aren't conditioned to the point where their fibrous nature no longer plays havoc with the internal workings
of both mill machinery and the animal intestines.
Matching boiler capacity to the job at hand is imperative.
Supplying fuel correctly in terms of calorific value and volume is a must, and reducing heat loss from pipes and valves is
the third important issue that needs to be addressed.
Insufficient steam will result in droplets of water in acidic
form being literally torn off the top boiler water surface. These
droplets will create problems in the supply system to the press
conditioner. Regular checks on combustion will prove valuable, especially when you receive oil from a range of suppliers. It is surprising how much variance there is between origins of oil. In mills, where there are more than three presses
operating, it is quite staggering how fuel costs mount through
the year. A check on the outgoing stack will be of interest to
76
all maintenance engineers and of value to some of the more
astute ones.
Checking steam traps and valves regularly will also pay
dividends. Not only will you be better equipped to control
boiler water feed temperature if you know that none of
your traps are passing steam, but you will also reduce your
fuel costs. Stand next to the hotwell return tank when all
the presses are operating, and if you can hear knocking or
banging in the tank, you know steam is passing through one
or more of the traps. In the last mill I visited, the tank was
November 2009 / World Grain / www.World-Grain.com
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World Grain - November 2009
Table of Contents for the Digital Edition of World Grain - November 2009
Contents
World Grain - November 2009 - 1
World Grain - November 2009 - 2
World Grain - November 2009 - 3
World Grain - November 2009 - Contents
World Grain - November 2009 - 5
World Grain - November 2009 - 6
World Grain - November 2009 - 7
World Grain - November 2009 - 8
World Grain - November 2009 - 9
World Grain - November 2009 - 10
World Grain - November 2009 - 11
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