Reliability
Valmet puts safety before anything else in our daily operations. We're also committed to supporting you in reaching your safety targets.
We provide reliability services that keep your equipment and processes running smoothly. We make sure that spare parts and components are easily available with minimal inventory costs. Reliable deliveries ensure that material is managed efficiently at your site every day.
Our maintenance and shutdown management services help you to keep your production assets in good working condition, minimizing downtime and controlling maintenance costs. We offer services for planning and implementing annual shutdowns to avoid cost and schedule overruns.
Reliability
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Field Report - Chronic dryer drive oscillation, a case study
The clack-clack-clack noise warned of heavy oscillation in the drive, subjecting the machine to potentially damaging duress. The only known cure was a shutdown and restart, costing the mill productivity and dollars. The shift supervisor calls in a drive technician for assistance...
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Field Report - Cleaning VacRolls
VacRoll suction holes and the grooves of all rolls should be cleaned regularly, as they may get completely clogged due to web moisture, particularly at the start of the dryer section. Bearing housings also need attention. Proper handling of the rolls is also important.
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Field Report - Care and handling of Uhle boxes
Reliable operation of a press section uhle box requires attention to care and handling, as well as routine maintenance. Blades and covers are susceptible to costly damage if improperly handled and maintained.
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Field Report - Screen cylinder troubleshooting
Once a screen cylinder's holes plug or its raised plating or coating is worn smooth, a host of operational problems can occur affecting runnability, capacity, pulp quality and cylinder life. There are three warning signs of excessive wear to monitor.
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Field Report - Common hydraulic valves, pressure reducing valves
Pressure reducing valves are used to create and hold a pressure setpoint in a downstream hydraulic branch. Valmet uses sandwich style valves because they are easy to fit in a stacked hydraulic valve block circuit.
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Common evaporator issues and solutions
Evaporators are used to evaporate black liquor from approximately 15% dry solids to 70-85% dry solids. Operating issues include scaling, corrosion, liquor carry-over, vacuum, condensate segregation and foaming liquor. Each can be mitigated with process and technology changes.
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Field Report - Dynamic balancing of rolls
Although a roll is statically balanced, it may have an eccentric center of gravity which cannot be detected by simple static balance. This will become noticeable when the roll speed is increased, and an end-for-end motion occurs. Dynamic unbalance requires investigation to determine which end, or both, require counter-weighting.
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Field Report - Suction roll packing strip grooving, a case study
A paperboard mill suffered from unexplained grooving in the suction and couch rolls and sealing strips. The fog shower was identified as a culprit.
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Field Report - Improving suction roll performance
To optimize the efficiency of and ensure the best return on a suction roll investment, mill maintenance departments should follow some basic guidelines.
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Field Report - Function and setup of size press sealing blade
Properly functioning sealing blades in a metered size press prevent air from entering the application chamber while lubricating the blade tip/applicator roll interface. Periodic checks of the blade setup are essential for a long and trouble-free blade lifetime.