Hydrocarbon Processing - August 2022 - 66
Gas Processing & LNG Industry Spotlight
inder upward, reversing the valve motion.
The helix slots can be reversed to provide
either fail-open or fail-closed movement.
The slot can also be characterized to
create different torque curves and valve
opening movement profiles to match the
valve being actuated.
The resulting space savings can be dramatic,
as shown in FIG. 5. By combining
the pneumatic cylinder and spring into
the same housing, the overall actuator
size is greatly reduced. More importantly,
the actuator is mounted vertically above
the valve, allowing the entire valve/actuator
assembly to be pulled straight up
for easy maintenance.
Since the actuator takes up nearly the
same footprint as the valve, this frees up
significant space in all directions that
can be used by other equipment. In a
constrained-space environment, this can
make all the difference for the engineering
team, enabling this team to fill that
space with additional piping. It also enables
the team to place valves in very close
proximity to each other, or to place them
near a wall or tank, which is not possible
with traditional actuators. Despite the
very close quarters, each valve assembly
can be pulled up and out of the pipeline
for service and maintenance.
The helical-slot actuator design is an
excellent choice for any environment
where space is at a premium, such as with
piping manifolds and on process skids.
The available actuator response speeds
and torques match the offerings of scotch
yoke or rack-and-pinion actuators, but this
functionality is provided in a much smaller
footprint. The actuators are also offered
as a part of a valve package that is safety integrity
level (SIL) rated, enabling them to
FIG. 2. An FLNG facility is as space constrained as an FPSO unit, but it also adds the challenge of
fitting in many large, high-pressure, actuated valves-each critical to production and safe operation.
FIG. 4. A helical-slot actuator combines the
spring and pneumatic cylinder into a single
vertical housing mounted directly above the
valve. As the piston moves, rollers engage
slots on the side of the helical cylinder to turn
the valve.
FIG. 3. A typical actuator uses a pneumatic cylinder to actuate the valve and an opposing spring
cylinder to drive the valve to a fail-safe state. The design works well, but takes up a great deal of
space when sized for large valves and high pressures.
66 AUGUST 2022 | HydrocarbonProcessing.com
FIG. 5. This picture compares the overall
footprint of a scotch yoke actuator (in red) to
that of a helical-slot actuator with the same
torque. The vertical design of the helicalslot
actuator (in blue) allows it to be pulled
straight up, requiring little more space than
the valve itself.
http://www.HydrocarbonProcessing.com
Hydrocarbon Processing - August 2022
Table of Contents for the Digital Edition of Hydrocarbon Processing - August 2022
Contents
Hydrocarbon Processing - August 2022 - Cover1
Hydrocarbon Processing - August 2022 - Cover2
Hydrocarbon Processing - August 2022 - Contents
Hydrocarbon Processing - August 2022 - 4
Hydrocarbon Processing - August 2022 - 5
Hydrocarbon Processing - August 2022 - 6
Hydrocarbon Processing - August 2022 - 7
Hydrocarbon Processing - August 2022 - 8
Hydrocarbon Processing - August 2022 - 9
Hydrocarbon Processing - August 2022 - 10
Hydrocarbon Processing - August 2022 - 11
Hydrocarbon Processing - August 2022 - 12
Hydrocarbon Processing - August 2022 - 13
Hydrocarbon Processing - August 2022 - 14
Hydrocarbon Processing - August 2022 - 15
Hydrocarbon Processing - August 2022 - 16
Hydrocarbon Processing - August 2022 - 17
Hydrocarbon Processing - August 2022 - 18
Hydrocarbon Processing - August 2022 - 19
Hydrocarbon Processing - August 2022 - 20
Hydrocarbon Processing - August 2022 - 21
Hydrocarbon Processing - August 2022 - 22
Hydrocarbon Processing - August 2022 - 23
Hydrocarbon Processing - August 2022 - 24
Hydrocarbon Processing - August 2022 - 25
Hydrocarbon Processing - August 2022 - 26
Hydrocarbon Processing - August 2022 - 27
Hydrocarbon Processing - August 2022 - 28
Hydrocarbon Processing - August 2022 - 29
Hydrocarbon Processing - August 2022 - 30
Hydrocarbon Processing - August 2022 - 31
Hydrocarbon Processing - August 2022 - 32
Hydrocarbon Processing - August 2022 - 33
Hydrocarbon Processing - August 2022 - 34
Hydrocarbon Processing - August 2022 - 35
Hydrocarbon Processing - August 2022 - 36
Hydrocarbon Processing - August 2022 - 37
Hydrocarbon Processing - August 2022 - 38
Hydrocarbon Processing - August 2022 - 39
Hydrocarbon Processing - August 2022 - 40
Hydrocarbon Processing - August 2022 - 41
Hydrocarbon Processing - August 2022 - 42
Hydrocarbon Processing - August 2022 - 43
Hydrocarbon Processing - August 2022 - 44
Hydrocarbon Processing - August 2022 - 45
Hydrocarbon Processing - August 2022 - 46
Hydrocarbon Processing - August 2022 - 47
Hydrocarbon Processing - August 2022 - 48
Hydrocarbon Processing - August 2022 - 49
Hydrocarbon Processing - August 2022 - 50
Hydrocarbon Processing - August 2022 - 51
Hydrocarbon Processing - August 2022 - 52
Hydrocarbon Processing - August 2022 - 53
Hydrocarbon Processing - August 2022 - 54
Hydrocarbon Processing - August 2022 - 55
Hydrocarbon Processing - August 2022 - 56
Hydrocarbon Processing - August 2022 - 57
Hydrocarbon Processing - August 2022 - 58
Hydrocarbon Processing - August 2022 - 59
Hydrocarbon Processing - August 2022 - 60
Hydrocarbon Processing - August 2022 - 61
Hydrocarbon Processing - August 2022 - 62
Hydrocarbon Processing - August 2022 - 63
Hydrocarbon Processing - August 2022 - 64
Hydrocarbon Processing - August 2022 - 65
Hydrocarbon Processing - August 2022 - 66
Hydrocarbon Processing - August 2022 - 67
Hydrocarbon Processing - August 2022 - 68
Hydrocarbon Processing - August 2022 - 69
Hydrocarbon Processing - August 2022 - 70
Hydrocarbon Processing - August 2022 - 71
Hydrocarbon Processing - August 2022 - 72
Hydrocarbon Processing - August 2022 - 73
Hydrocarbon Processing - August 2022 - 74
Hydrocarbon Processing - August 2022 - 75
Hydrocarbon Processing - August 2022 - 76
Hydrocarbon Processing - August 2022 - 77
Hydrocarbon Processing - August 2022 - 78
Hydrocarbon Processing - August 2022 - 79
Hydrocarbon Processing - August 2022 - 80
Hydrocarbon Processing - August 2022 - 81
Hydrocarbon Processing - August 2022 - 82
Hydrocarbon Processing - August 2022 - 83
Hydrocarbon Processing - August 2022 - 84
Hydrocarbon Processing - August 2022 - 85
Hydrocarbon Processing - August 2022 - 86
Hydrocarbon Processing - August 2022 - 87
Hydrocarbon Processing - August 2022 - 88
Hydrocarbon Processing - August 2022 - 89
Hydrocarbon Processing - August 2022 - 90
Hydrocarbon Processing - August 2022 - Cover3
Hydrocarbon Processing - August 2022 - Cover4
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
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