Chemical Engineering June 2010 - 35

sure loadings outside of what is provided
in the rules of Appendix EE.
These include the following:
* Negative pressure inside the vessel
and inside the jacket
* Negative pressure inside the shell and
positive pressure inside the jacket
* Positive pressure inside the vessel and
negative pressure inside the jacket
* External nozzle loadings from piping
connections
* Cyclic loadings to any of the above
combinations
When specifying the half pipe jacket be
sure to provide the manufacturer with
the pipe size required, the pitch of the
coils, the design temperature and the
design pressure. An approximate location
of the half-pipe inlet and outlet
nozzles is beneficial for the manufacturer
to determine potential interferences
with other nozzles on the vessel.
Dimpled and embossed jackets are
another form of jacket assemblies
and are addressed by Appendix 17, a
mandatory appendix of the Code. If
the manufacturer is using a plate that
has been dimpled or embossed prior
to welding, then a proof test shall be
performed in accordance with Section
UG-101 of the code. The proof test
requires the use of a representative
panel, which is rectangular with at
least five pitches in each direction and
not less than 24 in. in either direction.
A proof test can add additional cost to
the fabrication of a vessel.
It is strongly recommended that if a
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Circle 17 on p. 62 or go to adlinks.che.com/29251-17
vessel requires any type of jacket, the
user should provide a supplemental
specification sheet with a drawing of
the vessel and the required location
of the jacket(s). The required surface
area and heat transfer calculations
are the responsibility of the user. ■
Edited by Scott Jenkins
Author
Keith Kachelhofer is the
corporate mechanical group
leader for Jedson Engineering
Inc. (Park 50 Technecenter,
5300 Dupont Circle,
Milford, OH 45150; Phone:
912-330-7777; E-mail: keith.
kachelhofer@jedson.com) at
its Georgia office. He holds
a degree in mechanical engineering
technology from
Southern Polytechnic University
in Marietta, Georgia. Kachelhofer has
over fifteen years experience with ASME pressure
vessels and is a licensed professional engineer
(PE) in Georgia, North Carolina, Delaware,
Maine, New York, Ohio and Utah.
Circle 23 on p. 62 or go to adlinks.che.com/29251-23
ChemiCal engineering www.Che.Com June 2010 35
http://www.rotex.com/apex https://nymail.accessintel.com/ex http://adlinks.che.com/29251-17 http://adlinks.che.com/29251-23 http://www.Che.Com
Chemical Engineering June 2010

Table of Contents for the Digital Edition of Chemical Engineering June 2010
