Chemical Engineering July 2020 - 36

ing containment seals to withstand
much higher pressures and higher
speeds than contacting containment-seal
designs.
non-contacting dry-running containment
seals are the default option
in API 682 when considering a dry
containment-seal system (no liquid
buffer). they have a lower wear rate
in operation and are more tolerant of
low-dewpoint buffer gases, higher
surface speeds and pressure differentials
(Figure 4).
these seals are advantageous
when compared to dry-contacting
containment seals in that the deliberate
face separation insulates the
seal from accelerated wear due to
pressure excursions in the flare or
vapor-recovery system. they can
be instrumented to monitor temperature
changes within the seal
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36
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ChemiCal engineering www.Chemengonline.Com July 2020
and provide an additional indication
of elevated inner-seal leakage. Furthermore,
they offer an extremely
durable seal design and provide low
cost of operation and ownership.
these sealing arrangements are
among the many presented in API
682. Since the introduction of Plans
52, 72, 75 and 76 in early editions of
API 682, lessons learned and additional
testing activities have yielded
a better understanding of the capabilities
and limitations of some
seal-support systems. continued
collaboration between seal manufacturers,
end users and engineering
contractors will provide the safest,
most reliable and cost-effective
sealing system for any application.
As a result, these companies will
continue to make positive impacts
on the environment by reducing fugitive
emissions. they will also reduce
product waste, environmental
remediation costs, unplanned maintenance
and downtime.
■
Edited by Mary Page Bailey
Authors
Brian Kalfrin is senior regional
engineering
manager
at John
Crane (Email: bkalfrin@johncrane.
com). He has over 19 years of experience
working with mechanical
seals and related systems. At John
Crane, his duties include design
engineering oversight,
analysis
and recommendation formulation
to address challenging applications,
along with design evaluation of existing and proposed
mechanical seals using finite element analysis
(FEA) software. He is also responsible for training of both
users and John Crane personnel in mechanical seal applications
and troubleshooting. Kalfrin is a member of
the Texas A&M International Pump Users Symposium
Advisory Committee and the API 682 Task Force currently
working on the 5th edition of the standard. He
holds
a
B.S.
Drexel University.
Neil Slater is strategic alliance
manager, Europe, Middle East and
Africa
(EMEA)
at
John
Crane
(Email: neil.slater@johncrane.com).
He has worked for John Crane for
the last 5 years, and his current
role involves working with key
end-users to deliver performancebased
reliability programs that
look at improving the mean time
between repair (MTBR) and availability of rotating equipment
across the EMEA region. His previous responsibilities
with John Crane include a business development
role with the company's Vessel Seals division. Slater
began his career in an apprenticeship in the pump industry
and also worked with the Royal Electrical and
Mechanical Engineers in the British Army.
in
mechanical
engineering
from
Seal-less Pumps
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