Thanks for everyone's help with this.
I called the control room of the plant with the SIS system and confirmed that the buttons that I clumsily referred to as the "Instrument Air Dump" are actually labeled "ESD." Clearly I have very little experience with SIS systems.
Based on the discussion...
All,
First off, thank you for so many replies so fast. Let me try to fill in the gaps from my original post:
For the current plant in question:
1. There is no SIS system.
2. There is a backup nitrogen supply to the IA header that is supposedly very reliable (per AL)
3. The air dump valve is...
All,
I have worked in several plants that have a hardwired Instrument-Air-Dump switch. In every case the plant was extremely uncomfortable with the thought of actually using this system as you might imagine. One of these plants was a large hydrocarbon processing plant with a full-fledged SIS...
You might try a multistage disc pump. I could have sworn Discflo was working on this. I know the guys making the knock-off discflo pumps at Adeptek pumps have these on their website. You might also look at the eccentric disc pumps by Mouvex. I haven't used any eccentric disc pumps myself.
If you are willing to spend the money, it might be a good idea to buy the 2nd edition of Darby's book (1st edition won't work). He walks you through using a "power law model" Reynolds number, which can be used as normal with either the Hooper-2K method or his own 3K method.
I have used the...
All,
I have worked in several plants that have a hardwired Instrument-Air-Dump switch. In every case the plant was extremely uncomfortable with the thought of actually using this system as you might imagine. One of these plants was a large hydrocarbon processing plant with a full-fledged SIS...
thread378-293910
All,
It has been some time since I posted this question (see the above thread), but in the meantime I stumbled across a different solution to this problem. Somewhere I found the suggestion to use a long piece of angle iron or even just a long rod to connect the nozzle to the...
Micalbrch and AtlasPumps,
Thanks for your input. I am moving forward with the discflo pump.
I was first introduced to the discflo pump as a replacement for progessive cavity pumps with fewer wearing parts. That was in a ceramic slurry application and the guy who owned the pump loved how...
Hello All,
I am trying to find some rational for sizing an anti-siphon hole on a dip tube into a vessel. The fluid is approximately 10,000 cP and flowing in an 8" pipe. I have read threads on here suggesting everything from 1/4" to 1/2" holes for this purpose. The vessel is a true ASME...
Hello All,
Does anyone have the knowledge to make a good comparison of these two pumping Technologies?
I am considering using a Waukesha Universal pump or a Discflo pump for the following application:
I know this group likes specifics so here goes:
flow rates around 100 gpm, head around 200...
The folks at flexitallic claim that spiral-wound gaskets are better in a thermally cycling service than sheet gaskets. Given the trouble with cold flow that PTFE has this could be reasonable. I have been replacing my PTFE gaskets with spiral-wounds in thermal cycling service for about three...
