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Questions
Pre-Sales FAQ's
Jamesbury Products
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Neles Products
- What was the reason for designing the
Series X valve?
The Series X was developed to replace the MBV in sizes
1" - 8" (DN 25-200) sizes. the Series X is more cost effective
than the MBV due to the following:
- Common shaft diameters in both class 150 & 300
- Reduced seat diameters
- Reduced casting size
- Fewer linkages required
- Will the MBV be available above 8" (DN
200)?
Yes. The MBV is still available in sizes 10"
& 12" (DN 250-300). Also, the new trunnion design is available as
well Bulletin 1X22EN.
- How does the Series X compare to the new Series M
design?
The Series X is very similar to the Series M, but has the following
differences:
- Different body & seat designs to
accommodate higher temperatures.
- Expanded material offering and
constructions.
- Higher temperature capabilities
- Can I use an Series M instead of an Series X?
Yes. If the temperature limitations and material
combinations are acceptable to your application.
- Is the Series X offered in standard bore?
Yes. See Bulletin
1X21EN.
- Is the Series X fully rated?
The Series X is fully rated in all sizes in ASME class 150 and
1" - 4" (DN 25-100), ASME class 300. 6" & 8" (DN
150-200) sizes in ASME class 300 are slightly reduced (as in the Series M) (i.e. the valve
trim is not capable of operating at full ASME pressure differentials at given
temperatures). The body ratings, of course, are fully rated. These
Limitations are depicted in Bulletin
1X20EN. For Example: A ASME class 300 carbon steel valve (WCB)
at 100° F (38° C) service temperature, is rated for a
working pressure of 740 psi (51 bar), per the requirements of ASME B16.34.
The 6" (DN 150), ASME class 300 Series X valve has a maximum operational working
pressure differential of 500 psi (35 bar). This is known as a reduced rated valve.
- What do I do if my service conditions are
beyond the capabilities of the 6" & 8" (DN 150 & 200) sizes?
For the relatively few applications that fall outside the capabilities
of the Series X, you can offer the fully rated trunnion Series X.
- What was the reason for designing the Series M valves?
This valve was designed primarily for the P & P market,
hence the 480° F (250° C) upper limit. It
has a lower torque requirement than the older MBV, and less body mass.
The Neles Series M is the "next generation" of metal-seated P & P
ball valve from Metso, offering a very robust, scraper seat while making the
materials most commonly utilized in the P & P industry available as a
standard offering.
- Is the Series M a fully rated ASME valve?
The 1"-12" (DN 25-300) ASME class 150 and the 1"-2" (DN 25-50) ASME class 300 are fully rated;
3" and larger ASME class 300 have a maximum
operating pressure differential of 350 psi (24 bar).
- Are the body connections as strong as the MBV?
Yes. They are the same as the MBV.
- Is a trunnion design available?
Yes. It is available in 10"-16" (DN 250-400) ASME class 150 and 300.
- Is the Series M a direct in-line replacement for the MBV?
Yes. Sizes 1"-6" (DN 25-150) are ASME 150 and 300;
sizes 8"-12" (DN 200-300) ASME 150 are to ASME B16.10 long pattern, and sizes
8"-12" (DN 200-300) ASME 300 are to ASME B16.10 short pattern. These are
the same as the PD, C6D, & Series M.
- Does the Series M have any common parts with MBV?
Yes. The ball and seats are common, however, the K
seat is being replaced by the internal diameter (ID) locking P seat. Some
of the packing kits are also common.
- Does the Series M use the same linkages as the older MBV?
No. This is a key-to-key design. It does not
require a spline connection.
- Can the Series M be manufactured with large male (LM) flanges?
Because the Series M is a cost-effective design, the excess
material required for these flanges may not be on the casting. This would
have to be evaluated on a case-by-case basis. For now, LM flange
applications will be fulfilled by the Series C.
- What is the standard shutoff classification of the Series M?
The metal-seated version is to ANSI/FCI 70-2 class V, and the soft-seated version is bubble tight. Tighter shutoff
for the metal-seated version is available; Consult the factory.
- Is the K seat available for the Series M?
No, P, S, E, M, & T seats will be the standard
offering.
- P - Bi-directional locked scraper seat
- S - Unlocked scraper seat for general-purpose applications
- E - Scraper seat for low Δp applications; has a preferred pressure direction
- M - Soft Seat for general use
- T - Soft seat for general use
What materials are available?
316 SS CF8M is the standard offering. Both 317 SS CG8M
and AVESTA® Ck-3McuN are also available on special order. Soft
seats are typically specified with the AVESTA® Material.
Have linkages been designed for actuators other than the B1?
Yes. Linkages are available for Mastergear, DC/DJ, as well as the Series B actuators.
Are Stellite® sleeves available for the Series M?
Yes. Stellite® sleeves for the body are available
and, depending on valve size, the ball may be Stellite®-coated and sleeved
or solid Stellite®. The product coding for this option is Series M2_ _ _ _S_.
Can the Series M be used for control applications?
Yes. However, like all floating or
seat-supported ball valves, the Series M will likely exhibit higher stiction than more
traditional control designs such as the Series R, Finetrol®, and even the
Neles trunnion ball designs.
Is Q-Trim™ available for the Series M?
Yes. Simply add "Q-" to the beginning code
of the valve, i.e., Q-MCA04.....
Is it okay to use the Series M in all P & P applications?
Those specifying valves for various services should always check
the application against the appropriateness of whatever design valve they wish
to utilize. However, it is likely that the Series M is appropriate for the
majority of the P & P applications one will run across when using ball
valves. There are some exceptions. We are working on the development
of a narrow-faced scraper seat to address the high-scaling applications commonly
found in some continuous digester applications. Currently, only the
Series C has the narrow-faced scraper seat option. In addition, when the
customer requires reduced or standard bore, one must remember that the Series M is
made in full bore only.
Is it okay to use the Series M in continuous digester applications?
We are now qualifying the Series M for several
applications. On a typical continuous digester there are several
applications where the Series M would be a very good choice. We are revising our
continuous digester application guide to include the Series M as an option.
If one of my customers has a standard MBV
design and wants to replace the valve only, is this a direct replacement?
No. As stated above, the Series M has a
keyed drive shaft. A different linkage kit would be needed but not that
the splined coupling is not needed to mount a Series B1 actuator on the Series M.
How does the Series X MBV compare to the Series M?
In general, the Series X has a different body and seat
design to accommodate higher temperatures.
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Consistency Products
- What does the term consistency mean as it
applies to the measurement for pulp stock qualities?
As two definitions apply, the definition used should
consider where in the process we are talking. the first definition is the
percentage by weight of dry solids in a pulp water mix. the second
definition we'll be using is the percentage by weight of dry fiber in a pulp
water mix.
- Who makes consistency on-line transmitters?
Process control requires measurements to be on-line and
real-time. Measurement time-lags inhibit the ability to tightly control
changing processes automatically. Because of the time required for
processing, no one makes an on-line, real-time consistency transmitter.
All real-time consistency measurements are inferred where we measure some other
property of the slurry and infer consistency.
- Why are there two different definitions for consistency?
In some stages of the process, the slurry will contain some
mineral solids (i.e. clay, talc, CaC03 or TiO2).
Different inferential measurement techniques will reach differently to the
contribution of the minerals. Some technologies are blind to fillers,
while some see fillers in similar proportion as fiber, and some will amplify the
contribution of minerals.
- What technologies are available for
measuring consistency on-line and how do they work?
Shear force transmitters are the most often applied
measurement. These transmitters measure the force necessary to separate or
shear through the fiber network. There are three optical
technologies: Attenuation of light, reflection of light and
de-polarization of polarized light. Radioactive density meters saw
resurgence in the early 1990's but fizzled again because of the limits of the
technology. The latest and perhaps most promising technology is the
microwave-based measurement. They measure the time of flight or velocity
of the microwave as it traverses between antennas.
- Which of these technologies does Metso Automation supply?
Metso Automation supplies shear force transmitters - SmartPulp, attenuation of light
transmitters - SmartLX0, polarized light
- SmartLC0 and microwave - Kajaani MCAi.
- Of these technologies, which is best?
Measuring consistency is extremely
application-intensive. there are many factors that should be considered
when making the decision on measurement principle such as: flow rate,
furnish type, pipe size, amount of minerals in the slurry, consistency range,
application goals, system pressure, degree of changes in brightness, color and
freeness... There is not one technology that is best for all applications.
- SmartPulp is a static blade transmitter. Are there other methods
of measuring shear other than the static blade?
Yes. In addition to the static blade, there are
pulsing blades, rotating blades and fluff body probes. There are several
producers of static blade and rotating blade consistency transmitters.
- What is SmartPulp's market-share worldwide?
SmartPulp unit sales are approximately equal to all other
shear force competitors combined for the worldwide market.
- What features and benefits allow the
SmartPulp to dominate in this competitive arena?
SmartPulp is designed with no moving parts and does not
require regular maintenance, as opposed to rotating blades that require frequent
and intensive maintenance. SmartPulp has advanced communications features
as well as programmable calibration, built-in calibration curves, sensor
selection customized for different pulp types, excellent flow compensation,
temperature compensation, outstanding hysteresis and sensitivity, recipe
capability, one- or two-point calibration (up to 16-point on a single recipe),
ash correction, automatic synchronization with lab, output characterization (linearization),
wide rangeability, and flexible mounting. SmartPulp is the most
maintenance-friendly consistency transmitter made.
- How is compensation for changes in flow
rate accomplished with the SmartPulp, and can you prove that your efforts in
dealing with flow changes are successful?
Metso Automation has eight different sensors for the
SmartPulp. The design of the SmartPulp sensor considers pulp type,
consistency range and flow rates. There are several forces acting on the
sensor simultaneously, and the design of the sensor is such that the sum of all
forces other than shear remains constant as flow changes. The
effectiveness of this effort has been well proven in our lab and also by
independent tests done by:
- American Paper Institute (API 67)
- Norske Skogindustring A/S (NS 1990)
- WIP (test E 2564 T91).
How can I be sure I am selecting the best
sensor for my furnish?
Metso Automation maintains full-time applications
engineering support, so we are only a call away. We also put great
emphasis on training of our sales representatives and field support
people. Another tool we make available to our customers, free of charge,
is our unique CS-Advisor software. It will assist in transmitter
selection, installation as well as calibration.
What are the disadvantages of shear technology?
While shear force is the most often applied consistency
measurement, it does have limitations. Since shear will change with fiber
properties, so will the output of a shear force transmitter.
Shear-force-based measurement will respond to changes in fiber length, freeness,
wood species, blend ratio and Kappa. Furthermore, shear is a fiber-only
measurement. It will not detect the contribution of mineral solids to
overall consistency. For these reasons, SmartPulp has recipe capability
as well as ash correction.
What about optical technologies - are they
any better at dealing with furnish changes?
No. Actually, the attenuation of light and reflection
of light measurements are a bit worse. Not only are they sensitive to the
fiber properties, but they are also sensitive to brightness and color.
They will amplify the contribution of minerals anywhere from three to ten times
actual contribution. Polarized light (SmartLC) is not sensitive to fiber
properties, nor will brightness or color effect it. It will also measure
minerals in nearly the same proportion as fibers. The biggest limitation
to the technology is that the maximum consistency range is 1.5%. This
limits the application of the SmartLC to Headbox feeds, paper machine white
water, screen feeds, effluent, saveall feed and clear and cloudy white water
from the saveall.
What are the proper applications for the
attenuation and reflection of light measurement?
The best applications are with mechanical pulps, as
freeness, brightness and color are quite constant, but only applications in the
pulp mill where paper machine white water is not suitable for dilution. They
are suitable for fully bleached pulp, again with the stipulation that paper
machine white water is not used for dilution.
What about the KajaaniMCAI - how does it
react to changing furnish?
The KajaaniMCAi will not be affected by fiber length,
freeness, wood species, flow rate, brightness, color, Kappa or blend ratio.
It will detect the contribution of minerals in nearly the same proportion as
fiber. But, unlike the SmartLC, the KajaaniMCAi has a range of 0-75%
consistency, making it very versatile.
Sounds like the KajaaniMCAI is near
perfect. Are there issues that should be considered in applying this
technology?
Yes. There are three primary considerations.
High conductivity fluids can attenuate the microwave signal to the point where
flight time can not be accurately measured. Tests should always be carried
out to determine actual conductivity. This is rarely a concern in the
paper mill but is often an issue in chemical pulping. Low process
temperatures will increase the attenuation rate of the microwave signal.
Temperature will also impact time of flight, but MCAi measures the process
temperature and carries out the necessary compensation. In some cases,
customized compensation is desirable. Normally this is necessary only when temperature is below 86°F (30°C).
System pressure is a consideration, as microwave technology
will see changes in air content as consistency changes. Therefore, KajaaniMCAi's
lower limit on pressure is 22 psi (1.5 bar). The reason is to compress and
collapse air bubbles.
What are the primary applications where the
KajaaniMCAi is used?
MCAi is most often used where it is most critical to have
an accurate measurement. Of course, the most important consistency
measurement is a paper mill is the paper-machine machine chest.
Approximately half of the 600 MCAi installations are at the machine chest.
Other common applications are: recycled fiber pulpers, feed to bleaching,
saveall feed, refiner feed, high density towers, rejects refiner feed, and
furnish ingredients to stock blending. The key in these applications is
not the purchased cost of the equipment, but how much money the mill can save by
having a very accurate consistency measurement.
How can I save money through the use of the
KajaaniMCAi?
The answer to this question is as application-intensive as
applying the consistency transmitters themselves. If we were talking about
machine chests, we would look for saving in the form if reduced variability in
machine direction, basis weight and moisture, and the potential fiber
saving accompanying these improvements. MCAi, when utilized in a
feed-forward basis weight control strategy, can reduce off-quality production
and shorten grade change time, thus improving machine uptime.
Recycled fiber pulpers benefit from the flow-through design
of the MCAi. It is not troubled by debris fouling the sensor and
measurement. This allows the pulper to run at higher (according to design)
consistency, increasing dwell time in the pulper and increasing capacity of
downstream screens and cleaners. Stock blending is a great opportunity for
saving because the MCAi's superior accuracy facilitates blending the furnish
ingredients according to total mass. This greater accuracy in blending
allows maximum use of lower-cost furnish ingredients while maintaining their
quality demands.
Currently, there are more than 40,000 Valment and Kajaani consistency measurement solution
installed. Metso Automation's experience
and technology leadership has benefited pulp and paper mills all over the world by
offering the widest product range, process know-how, applications
expertise, and commitment to customer satisfaction.
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