Hydrocarbon Processing - April 2021 - 55

Engineering and Construction
preferred choice as they do not require
upstream shutdown. However, the operability of these isolation valves must be
checked, and they must be kept in proper serviced condition.
All tie-in points must be tagged with
tag numbers (the preferred method is to
have non-metallic plates with painted or
embossed numbers). A location coordinate table of all tie-ins should be marked
in piping layout drawings.
A unique problem of different material specifications of PMS between two
EPC contractors at tie-in points has been
encountered-this difference is difficult
to justify to an owner.
Piping corridors. The author has en-

countered the sharing of available space
in existing pipe bridges racks, road culverts and pipe ways with another contractor. FIG. 2 shows where a new culvert
was designed to carry pipes of two EPC
contractors. The design was complicated due to a " T " joint and a side-by-side
passage through a road crossing. This
required many joint sittings of the two

contractors with the PMC. An agreement was required to determine the roles
and division of work within the culvert
area between the two contractors, in addition to the issue of material supply, to
avoid clashes between the two teams.
Similarly, in another case, a very narrow space was available for two contractors carrying out piping work between a
tank dike wall and a pond, and with little
space for vehicular/crane movement
(FIG. 3).
One contractor's scope was to lay
large trunk pipelines on a concrete sleeper, while the other contractor had too
many smaller pipes on a " T " post or pipe
rack, running parallel as per the original
contract. The original design eliminated
space for crane or vehicle movement.
Both contractors agreed to a common
type of supports. A goal post-type frame
mounted on concrete sleepers (FIG. 3)
proved to be a win-win solution.
Instrumentation. This can be the most

troublesome part in any brownfield project if it is not properly conceived by the

owner and clearly explained to the EPC
contractor.
Technological advancements are continuously emerging on types of instrumentation, communication, EMC and
RFI feature compliance.
If the previous plant control room
was an older generation, then the owner
must ensure that changes and revisions
are duly implemented and the compatibility of field instruments with the control room is addressed.
Upgrading software is required as
part of control system integration of instrumentation, as well as cybersecurity
and confidentiality requirements.
PRAMOD DIXIT works as a
consultant at Baroda India.
He spent 20 yr at Engineers
India Ltd. as a trays and tower
internals specialist, and another
20 yr in EPC companies Larsen
and Toubro and Essar Offshore in
different senior positions. He provides training to
operating company inspection and maintenance
engineers in related fields and advisory services in
the troubleshooting of engineering issues. Mr. Dixit
holds a B.Tech degree in mechanical engineering
from IIT Roorkee India.

LIVE WEBCAST
Thursday, May 6, 2021 | 10 a.m. CDT / 3 p.m. UTC

Exploring dense air injection application beneﬁts avoid FCC capacity reduction & increase turbogas performance
Massimo Capra
Manager Process Services
Aggreko

Aggreko Process Services is a unique dedicated Process Engineering team within Aggreko that
work alongside unit operations to deliver fast-track high value solutions that enhance Reﬁnery
and Petrochemical Plant capacity and efficiency.
This session will explore multiple Dense Air applications and their beneﬁts in a reﬁning or
chemical facility and take a closer look at:
* Main Air blower constraints in the FCC
* Refrigeration of reactor/ regenerator at the FFC during shut down
* How dense air can improve Turbogas power output
* An all-round view on possible applications of dense air to optimize Petrochemical Plant
Processes
At Aggreko we understand the huge pressure process industries face to continually improve
yield, upgrade capacity, and respond to ever-changing market conditions. Our advanced process
knowledge and proven experience delivers innovative solutions that are operationally safe and
reliable. Join our webinar to learn how our process engineers can help you achieve ultimate
process optimization.

Mike Rhodes
Managing Editor
Hydrocarbon Processing

Hydrocarbon Processing | APRIL 2021

http://www.HydrocarbonProcessing.com/Webcasts

Hydrocarbon Processing - April 2021

Table of Contents for the Digital Edition of Hydrocarbon Processing - April 2021