Chemical Engineering February 2017 - 47

Figure 1A
Figure 1B
Cover
FIGURE 1. The figures shown
here represent configuration
1 for special flange joints
in a single-pass, floatinghead
shell-and-tube heat
exchanger
Tail pipe
Floating
head
Internal expansion
bellow assembly
Ref tan
line
Gasket 1
Flange 3 - external
pipe spool flange (refer
to figure 1D)
Gasket 2
Pipe spool
Flange 1 - refer
to figure 1B
Flange 2 -
Figure 1C
FLANGE 1
GASKET 1
BELLOW ASSEMBLY
CONNECTION FLANGE
Figure 1C
O.D.
Gasket 1 DIA.
B.C.D.
I.D.
O.D.
B.C.D.
I.D.
Figure 1D
B.C.D.
Gasket 1 DIA.
O.D.
I.D. - Gasket 2
O.D. - Gasket 2
B.C.D.
FLANGE 2
GASKET 2
PAD FLANGE DETAILS
tion of heat exchangers using these designs
are very challenging for detailed-engineering
contractors and vendors alike. The cost of
the exchanger is higher due to the non-conventional
details and design approaches.
Process and thermal design engineers may
not realize the potential complications associated
with this type of heat exchangers
when specifying such exchangers at the
onset of a project. But during detailed engineering,
fabrication, operation and maintenance,
heat exchangers of this type continuously
pose challenges and can increase time
and cost at every stage.
Discussed here are various types of configurations
and construction details for special
flange joints adopted in previous projects
for this single-pass floating-head shell
and tube heat exchangers. The three cases
discussed here have been encountered in
various projects, but there may be other
FLANGE 3
PIPE SPOOL DETAILS
combinations related to these that are also
used industrially.
In the cases mentioned here, all other details,
such as the front end, shell, tube bundle
and floating head, are the same. Shell
cover dimensions may vary according to the
number of components or the parts forming
the bellow assembly. Also, their dimensions
are required to meet mechanical strength as
per the applicable design code or standard
(or the best mechanical judgment).
Configuration 1
Special flange joint configuration 1 has the
tailpipe coming out of the floating head
bolted to the expansion bellow assembly
using standard welding-neck, raised face
(WNRF) flanges (Figure 1A). The other end of
expansion bellow is welded with a non-standard
flange (Flange 1; Figure 1B). A ring-type
gasket has been used outside the bolt circle
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
FEBRUARY 2017
47

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Chemical Engineering February 2017

Table of Contents for the Digital Edition of Chemical Engineering February 2017

Contents
Chemical Engineering February 2017 - Cover1
Chemical Engineering February 2017 - Cover2
Chemical Engineering February 2017 - Contents
Chemical Engineering February 2017 - 2
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Chemical Engineering February 2017 - Cover3
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