World Grain - April 2006 - 58
grainoperations
Aerating grain piles
Investing in a quality aeration system for temporary
grain storage will pay long-term dividends
by Harmon Towne
With crop production increasing in many parts of the world,
there has been a movement in recent years to create large grain
storage piles during the harvest season.
As with any grain storage system, it is essential to have a
working knowledge of the best aeration practices to maintain
grain quality in a temporary storage pile.
To get the best results, a company will have to spend money
in order to ultimately save money. It is not uncommon for piles
to exceed 1 million bushels, nor is it uncommon to hear of a
10% spoilage rate in these piles. A properly designed aeration
system can cut the loss to 5%, meaning a savings of 50,000
bushels. At U.S.$2 per bushel, this could mean an overall savings of U.S.$100,000, which is more than enough money to
pay for a top-flight aeration system.
HOW MUCH AIR?
One of the things to consider when aerating large grain piles
is that not all grain in the pile will receive the same amount of
54
Photo courtesy of Brock Manufacturing
air. Even with a properly designed system, some parts of the
grain mass will not receive the designed amount.
Air travels the path of least resistance. If a large amount of
air tries to move through a small area, the resistance increases,
forcing the air to seek other paths.
Most permanent storage systems are designed for approximately 1/10 cubic feet per minute (CFM) per bushel, which
may not be adequate for large piles. Therefore, it is suggested
you design for 1/7 or 1/5 CFM per bushel, that way most of
the pile will receive at least 1/10 CFM per bushel.
DISTRIBUTION DUCTS
Before you determine the amount of air required, you
must know the amount of grain in the pile. There are formulas you can use to do this. However, determining the
amount of grain and the amount of air that is required to
aerate are just the initial steps of developing an effective
aeration system.
April 2006 / World Grain / www.World-Grain.com
http://www.World-Grain.com
World Grain - April 2006
Table of Contents for the Digital Edition of World Grain - April 2006
Contents
World Grain - April 2006 - 1
World Grain - April 2006 - 2
World Grain - April 2006 - 3
World Grain - April 2006 - Contents
World Grain - April 2006 - 5
World Grain - April 2006 - 6
World Grain - April 2006 - 7
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