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Tough Metso
Automation Solutions for a Tough Application.
 Since
the Delayed Coker process involves handling a range of gases,
liquids and solids at varying pressures and at temperatures of up to
1000°F, Metso Automation's Neles brand Delayed Coker 2-way ball
valves have been designed to meet these challenging applications by
providing tight, bi-directional shut-off. Unlike other ball valve
brands that are tight in only one direction, Neles valves operate
reliably under normal or reverse pressure - a key requirement in the
overhead vapor area where higher pressure occurs on the valve
closest to the fractionator return line.
 The
Neles Delayed Coker valve's live-loaded stem packing and steam purge
connection prevent residuum from leaking into the atmosphere. The
steam purge design is critical to the operational life expectancy of
the valve. Because the valves are oriented horizontally in the
pipeline, residuum tends to flow into the lower confines of the ball
body cavity. Neles supplies two body purge ports on every 2-way
valve, one in the lower part of the cavity, and one in the upper
part to flood with steam and minimize the flow or residuum to this
area. As a result, Neles Delayed Coker ball valves have a proven
record of trouble-free operation for periods exceeding 6 to 7 years
without maintenance. Download our new brochure at
www.NelesRefiningValves.com.
Metso Automation produces
valve solutions for a number of Delayed
Coking applications:
4-WAY SWITCHING VALVE
Delayed cokers are designed with two coke drums to facilitate
continuous operation. This allows the refiner to produce product in
one active drum, while cleaning the other inactive drum. In order to
facilitate continuous flow and direct flow to either one of two coke
drums or to a bypass, a special 4-way switching valve is required.
Metso Automation manufactures the Neles brand Y4 series 4-way
switching valve to meet these demands.
COKE DRUM DRAIN VALVE
This is a very demanding application due to the abrasive nature of
the decoking effluent. Metso Automation's solution is the Neles
series X-MBV full port, metal-seated ball valve.
COKE DRUM ISOLATION VALVE
This application deals with a variety of fluids and service
parameters. The valve must handle high pressure, and heavy residuum
at an elevated temperature (510°C/950°F). The fluid is also prone to
heavy coking at this temperature.
Metso Automation's solution is the Neles MBV Series in ANSI class
300 or 600 full port ball valve.
COKE FEED CONTROL & ISOLATION VALVE
There are a number critical valve applications between the bottom of
the fractionator and the coke heater. Metso Automation Neles model
X-MBV ball valves are ideal for these tough applications.
Tower bottoms and charge pump isolation valves encounter process
conditions that require reliable (Class V) tight shutoff to support
382 °C / 720 °F at 2, 4-3, 5 bar / 35-50 psi heavy resid.
Heater flow control isolation valve face process conditions with 382
°C / 720 °F heavy resid. The process pressure at this point would be
pump discharge pressure that can range 10-35 psi / 150-500 psi,
depending on the specific delayed coker design.
The heater flow control valve must have wide rangeability for
handling low flow during start-up and full flow during normal
operation.
OVERHEAD VAPOR LINE VALVE
Certain delayed coker designs call for a single overhead vapor line
valve as opposed to a pair of such valves. In this case the valve
must be able to isolate bi-directionally.
Two commonly found valve designs in overhead vapor line service are
wedge plug and wedge gate valves. But, both these styles are not the
best choice for handling the coke accumulation and leakage issues
that are problematic for overhead vapor line valves. The recommended
offering from Metso Automation for overhead vapor line valves is the
Neles MBV series.
To learn more about Metso Automation’s Delayed Coking Solutions,
visit
www.NelesRefiningValves.com to download our new Brochure,
Application Bulletins and Product Spec Sheets.
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