Hydrocarbon Processing - June 2022 - 47

Maintenance and Reliability
sodium hydroxide (NaOH). Therefore,
the piping from the stabilizer overhead to
the net gas scrubber is made of monel material
[66%-67% nickel (Ni), 29%-30%
copper (Cu)], a highly resistant material
for HCI aqueous solution that is also applied
to the upper part of the atmospheric
distillation column.
Problem. According to the contract, a
process license company dispatched an
inspection engineer to check the vessels
and columns in the process just after
completion of construction and internal
installation. The engineer's background
was mechanical; all equipment was inspected,
including the net gas scrubber
internals, and everything was found to be
in working order. As a final cross check,
the author performed an inspection with
the license vessel drawings following the
license inspector's report. A critical inconsistency
was found at the inlet nozzle
of the net gas scrubber: monel lining was
missing inside of the nozzle and flange
faces. The licensor specified the note on
its column drawing presented in FIG. 3.
Cause and solution. This finding was
promptly shared with the licensor, and was
also compared with the vendor drawings
from the manufacturer and the licensor.
Consequently, the vendor had not reflected
this critical note on its drawings and made
Recycle
hydrogen
Reactor
effluent
Stainless steel
Carbon steel
14 in.
Stainless steel
Carbon steel
Recycle
oil
FIG. 5. Piping schematic for the explosion area in the hydrocracking process.
Piping (15 meters)
damaged by HTHA
8 in.
Temperature control
valve (TV)
LIVE WEBCAST
Wednesday, June 29, 2022 | 9 a.m. CDT / 2 p.m. UTC
Dr. Carole Nakhle
CEO
Crystol Energy
Solving the Complexity of Energy Security and Sustainability
with Digital Technology
With the rapid escalation of energy prices and geopolitical risk in Europe, energy security has
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Ron Beck
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Sumeda Sharma
Technical Editor
Hydrocarbon Processing
Hydrocarbon Processing | JUNE 2022 47
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Hydrocarbon Processing - June 2022

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