Something must be different but we can't see it.
We have dried many species of wood around the world. This customer is drying common North American species. Wetness of wood is called moisture content. Again, nothing out of the ordinary.
Since some of you are interested and have shown an...
Using a VFD does two things. It stops wear and tear on the coupling and it also makes control of the seal water easy. We ease it open while the pump is starting and ease it shut as it comes to a halt.
When drying wood, we use a chamber pressure set point to set the boiling point of water and...
I agree that the graphs don't mean anything if you don't know the assignments. The point was the green line. Look at how many times the darn thing can start without a problem.
We are trying to be methodical. I'm trying to stay out of direct contact with the customer and a technician is doing...
Yes the VFD overloads but I think I have an idea. This has never been seen but there is a first time for everything. Following are three screen shots from this kiln. The green line is chamber pressure. The black, stepped line is the PLC dumping the condensate collection tank. When that black...
This is the kiln that is giving us trouble. We have built the same system many times. The blue vac pump is on top.
The tank at the end is temporary seal water for testing. Here's another.
The grey shell and tube is the condenser. The condensate falls into the SS tank. Everything has strainers.
Yes this is the first time we have ever seen anything like this. We probably have installed 80 to 100 pumps.
This pump is relatively small but it's still $5000.
Unfortunately, the installation is several hundred miles away. We are connected through a supervisory computer and input from the...
Mike,
We always use mechanical seals.
We always have strainers in the seal water supply.
We always use condensers before the pump.
We have a flow meter in the seal water supply coming from a cooling tower.
But thanks for your suggestions. And like I said, this kiln has been running about six...
We build vacuum dry kilns for the forest industry. We have been building them for about 20 years. These machines usually run 24/7. We use liquid ring vacuum pumps. We have recently started having trouble with one that was installed about six months ago. Sometimes it trips the VFD. The operator...
