Chemical Engineering October 2016 - 52

TI
Existing, in accordance with
earlier ASME B31.3
New and existing, in accordance
with current ASME B31.3
Insert line blind at flange joint for
leak test. From this point to tie-in
accordance with current B31.3
TI
Existing, in accordance
with earlier ASME B31.3
New and existing, in
accordance with current
ASME B31.3
FIGURE 8. Shown here is the difference between the tie-in (TI) point, where the new piping connects to existing
piping, and the point further along the existing piping at which the most current code issue will apply
existing system the following are
recommended:
❍
order was written
❍
A new weld joint connection
made to an existing pipe shall
comply with all applicable
requirements as stated in the
most current code at the time
the project specifications were
written and agreed to, or, in
the case of a repair or modification,
at the time the work
When connecting to an existing
flange, whether on pipe or
as an integral part of a component
or equipment item, it shall
be inspected and approved as
being compliant and without
sufficient damage or distortion
to be cause for rejection
* Including the tie-in interface point,
a leak test shall be performed on
Cut and dismantle existing
section of piping.
both the entire portion of a newly
installed piping system and that
portion of the existing system
extending from the tie-in interface
to a point at which the existing
section of piping can be blocked
in a manner that will withstand
leak-test pressure
* All rules of the most current code
should apply, not only to all of the
newly added piping, but also to
that portion of the existing piping
circuit included in the leak test
The following guidance attempts
to bring a philosophical approach to
how the code may still be utilized and
where its boundaries lie. The above
bullet points describe the difference
between the tie-in point, where the
new piping connects to the existing
piping, and the point further along the
existing piping at which the most current
code issue will apply. As shown in
Figure 8, that difference, or segment
of piping, is represented by the existing
piping that lies between the " TI "
indication and the existing flange joint
in which a line blind is inserted. This
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CHALLENGE CONVENTION
Circle 28 on p. 78 or go to adlinks.chemengonline.com/61500-28
52
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
OCTOBER 2016
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Chemical Engineering October 2016

Table of Contents for the Digital Edition of Chemical Engineering October 2016
