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July
2020
HYDROCARBON
ENGINEERING
70
REMBE
REMBE is mostly associated with REMBE GmbH Safety
and Control, which specialises in explosion safety and
pressure relief worldwide. The company offers
customers cross-industry safety concepts for systems
and equipment. All products are manufactured in
Germany and meet the demands of national and
international regulations.
The use of dry gas seals on large operating
equipment such as turbocompressors has increased
significantly over a number of decades, particularly in
harsh working environments such as oil and gas,
petrochemical and gas processing industries. A dry gas
seal uses a clean gas under pressure on the external side
of the seal, so that any leakage through the seal is the
buffer gas into the compressor. Not only does this
protect the environment from being contaminated with
process gas, but it keeps dirty gas from getting inside the
seal and causing damage.
An important component of a dry gas seal is the vent
system. For the primary vent system, a rupture disc is
typically installed in parallel with the vent line to
rupture at a set pressure and prevent excessive pressure
to instruments on a primary seal failure. A signalling
system on the primary vent system is recommended to
enable integrity checks while the seal system is still
online.
Customers using dry gas seals require rupture discs
to be installed to vent excess pressure in the event that
a catastrophic failure of the primary seal occurs. In the
event the pressure increases beyond its predetermined
limit, a higher gas flow or back pressure in the piping
system is present and needs to be safely vented. A
signalling device is also required to detect a change in
the rupture discs status in order to initiate a shutdown
of the process in the event of an overpressure situation.
REMBE’s reverse acting rupture disc with an
integrated polyamide signalling device (SGKIKB) is a
cost-effective rupture disc suitable for the demanding
conditions found in dry gas seal applications. Used
extensively in downstream projects, the IKB is the only
reverse acting rupture disc to be manufactured using
REMBE’s unique Contour Precision Lasering (CPL)
technology ensuring high quality, accurate, burst control
even in the harshest of environments.
Nikkiso ACD, LLC
The Cryogenic Pumps unit of Nikkiso’s Clean Energy &
Industrial Gases group (CE&IG) consists of ACD LLC and
Nikkiso Cryo Inc. The CE&IG Centrifugal Pumps unit is the
largest in the world, offering a broad scope of submerged
motor pumps. The performance pumps span the entire
range of needs, from small to large, and everything in
between.
The company specialises in centrifugal and
reciprocating pumps for the clean energy, industrial gas and
oil well service industries, as well as turbines for air
separation. Nikkiso ACD specialises in machinery designed
to operate at cryogenic temperatures as low as -420°F, the
boiling point of liquid hydrogen. Its diverse product lines
include a variety of cryogenic centrifugal and reciprocating
pumps for L/CNG applications, high pressure
cylinder/storage filling systems, trailer off loading, bulk
transfer, bunkering applications and storage tank filling.
Nikkiso Cryo’s innovative designs have resulted in the
first application of high pressure pumps for use on
regasification LNG carriers, the first and only cryogenic
pumps installed on an LNG GBS, compact high flow pumps
for the world’s largest FPSO under construction, as well as
compact, higher speed pumps used for a variety of LNG,
LPG and other applications.
Nikkiso Cryo’s original technologies have led to an
increase in reliability, with submerged motor cryogenic
pumps operating up to 40 000 hours before maintenance is
required.
ACD is ISO 9001-2015 certified; ensuring that every
component produced meets the highest standards of
quality in the industry.
Nikkiso ACD provides highly engineered solutions to
the most challenging problems in cryogenic equipment
design and operation, and develops innovative solutions to
meet tomorrow’s needs. The company also provides
excellent service and support for its products.
With skilled engineers, 65 field service technicians and
18 global locations, the Nikkiso CD&IG Pumps unit provides
timely, responsive service with integrity and a passion for
excellence.
friction between the ball and the seat. The
patent-pending bonnet reduces the area for coke
build-up, resulting in the actuator to be set at 40 – 50%
of the maximum torque rating. The addition of an internal
twin seal minimises the amount of process fluid entering
the body. As a top-entry switching valve, the DV-4
simplifies repair and trim replacement and allows the
valve to be serviced in-line, saving cost of crane and
manpower, and reducing downtime.
MOGAS valves installed performed for 11 – 12 hour
cycles between switching, which was considered “very
aggressive” and “top of industry” by a delayed coker
licensing company, when noting that the valves are
performing beyond expectations.