Chemical Engineering May 2013 - 53

Hot fluid
Water
TABLE 2. TYPICAL DESIGN HEAT-TRANSFER COEFFICIENTS
Ud (Btu/h·°F·ft2)
Cold fluid
Water
Aqueous solution
Light organics
Aqueous solution
Light organics
Medium organics Water
Heavy organics
Heavy organics
Light organics
Heavy organics
Light organics
Heavy organics
250-500
250-500
40-75
50-125
10-40
30-60
10-40
If a vendor's calculated heat-transfer coefficients are reasonably close to reliable
published values, the thermal design is probably correct. Do not expect an exact
match. Light organics are fl uids with viscosities less than 0.5 cP. Medium organics
are 0.5-1 cP, and heavy organics are above 1 cP.
Source: " Process Heat Transfer " , Donald Q. Kern, McGraw-Hill Companies, 1950.
www.tema.org) issues its own design
and manufacturing codes. There are
three categories: TEMA C, B and R. In
simple terms, TEMA C applies mostly
to water, oil and air at low or moderate
pressures and temperatures, and is the
most cost-effective standard in cases
where it is applicable. TEMA B is for
chemicals and petrochemicals at higher
temperatures and pressures. TEMA R,
for severe service involving high pressures
and temperatures, is widely used
in petroleum refineries, and is the most
expensive option. Inappropriate TEMA
ratings will significantly increase the
cost of a heat exchanger, so choose
carefully based on existing plant data
or suitable guidelines.
Keep in mind that you do not necessarily
have to design your heat
exchanger to TEMA standards. In
particular, TEMA B and R standards
enforce a minimum tube diameter
which could lead to too-low velocities
if the tubeside flowrate is small. The
resulting low heat-transfer coefficient
may require a large and expensive
heat exchanger. In such situations, it
may be best not to design your heat
exchanger to TEMA standards.
Heat exchanger type. It is very important
to specify the correct type of
heat exchanger for the application
CHECKMATE.
When it comes to check
valves, Check-All is king.
Our spring loaded check valves
are assembled to your exact
needs, ensuring absolute
precision and reliability. They
work like they should. That's
what makes Check-All the only
choice. Plus, most lead times
are less than one week.
Count on the king.
Get me a Check-All.
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Circle 14 on p. 72 or go to adlinks.che.com/45772-14
CHEMICAL ENGINEERING WWW.CHE.COM MAY 2013 51
9/21/12 9:13 AM

http://www.tema.org http://www.checkall.com http://adlinks.che.com/45772-14 http://WWW.CHE.COM

Chemical Engineering May 2013

Table of Contents for the Digital Edition of Chemical Engineering May 2013

Contents
Chemical Engineering May 2013 - Cover1
Chemical Engineering May 2013 - Cover2
Chemical Engineering May 2013 - Contents
Chemical Engineering May 2013 - 2
Chemical Engineering May 2013 - 3
Chemical Engineering May 2013 - 4
Chemical Engineering May 2013 - 5
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Chemical Engineering May 2013 - Cover3
Chemical Engineering May 2013 - Cover4
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