Teus Tuinenburg might know. ■

Dear meijden20,

The description “onderdruk overnamepunt” seems to be a “made up” description to attempt to describe the function of that element.

(It is probably a material transition point under vacuum)

The context of this part in the intended installation must reveal the function of this transition point and the meaning of this description.

With more information about the installation, this rather cryptically description can be decoded.

Dear Michael,

Teus Tuinenburg might not know.

Best regards

Teus ■

Originally Posted by Teus Tuinenburg

Dear meijden20,

The description “onderdruk overnamepunt” seems to be a “made up” description to attempt to describe the function of that element.

(It is probably a material transition point under vacuum)

The context of this part in the intended installation must reveal the function of this transition point and the meaning of this description.

With more information about the installation, this rather cryptically description can be decoded.

Dear Michael,

Teus Tuinenburg might not know.

Best regards

Teus

It just proves that there's a first time for everything!■

Dear meijden,

The question "why"should be asked to the author of the specification, you refer to.

A certain underpressure in a silo is normally maintained to prevent dust emissions through leaks and safety valves.

Also have a look at:

https://forum.bulk-online.com/showthread.php?t=15684

Have a nice day

Teus ■

Dear meijden20,

Being retired, makes a fast response possible.

A filter differential pressure of 15 mbar (150 mmWC) is hardly to believe the cause of a filter failure.

In my experience, I have seen filters operating perfectly with differential pressures up

to 350 mmWC for extended periods.

More important is the filterload in m/min (m3/min)/(m2).

For the very fine flyash (1- 100 micron), a filterload of 1.5 m/min or lower is advised.

(consult the filter supplier)

Too fierce and too often pulse cleaning can cause the dust-cake to be blown to dust again, causing the dust to be drawn back into the filter right away (known as over cleaning)

Your remark that the flyash has a temperature of 100 degrC is also a factor to pay attention to.

Depending on the filter fabric, this could be too high.

Forensic investigation on the failed filters and operational measurements as well as checking

(or making) the design calculations is the way to solve this type of problems.

success

Teus ■

My point, Teus knows NEARLY everything. ■

Porvair Filtration Group porvairfiltration.com provides filters for hot gasses and solids handling at elevated temperatures. The company's product range includes pulse-jet systems with filters made from sintered metal fiber as well as fluidizing media and air fluidizing pads made of sintered metal composites. The rugged high-flow metal filters are readily designed to a specified flow and differential pressure. ■

Another thought... The phrase might refer to a point on the exhaust fan's Pressure-Flow curve (near the peak) where its operation becomes unstable but I don't really see how this can be useful.

You haven't said if there is a problem with the system?

Michael Reid. ■