Chemical Engineering August 2018 - 64

air depending on site circumstances.
Silos generally can be manufactured
up to 16 ft in diameter and shipped
in one piece up to 90 ft long with a
90,000-lb weight. Construction, size
and weight are defined by the structural
requirements more so than the
size requirements.
In geographic terms, the location
of your silo can be affected by local
building codes and other safety regulations
that apply to the project. This
affects the design, construction and
installation of your silo and needs to
be considered upfront. Some locations
may require a permit, too. Vendors
follow the current International
Building Code standard building
codes for the specific job site location
in question. There are no specific
design codes for dry bulk silos, so a
combination of American Petroleum
Institute (API), American Society of
Mechanical Engineers (ASME) and
American Water Works Association
(AWWA) standards are used at
certain times to calculate allowable
stresses and other design factors.
J
How will the silo be maintained?
The objective here is to consider
what will be needed to maintain
high performance at minimal cost
throughout the life of the silo. For
example, make sure your silo has
easy access to internal components
for routine maintenance. Periodic inspection
by plant maintenance personnel
is required to keep up with
paint touch-up and other minor issues.
As your silo ages, look to your
manufacturer to provide inspection
services to ensure its safe and
lasting operation. Eventually, many
years down the road, these inspections
can help you assess whether
to repair or replace your silo.
There are more factors that go into
the silo selection, such as the user's
budget for storage and expectations
about having the new silo in place
before needing additional storage or
material handling equipment. Also, it
may help to include future needs, but
if you address the questions mentioned
here, you will position your
company for selecting a storage silo
that is quality-built and pleasing to
the eye, and that will serve the company
effectively for many years. n
Edited by Scott Jenkins
References
1. Gaylord, E.H., Gaylord, C.H.,
and Stallmeyer, J.E.,
" Structural Engineering Handbook, " 4th ed., McGraw-Hill
Education, New York, 1996.
2. American Institute of Steel Construction (AISC), " Steel
Construction Manual, " 11th ed., American Institute of
Physics / Springer, College Park, Md., 2017.
Author
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