HCL dosing
HCL dosing
(OP)
We are trying to install a HCL dosing system from HCL totes to our fumehoods. Can anyone suggest a good dosing system for such application.
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RE: HCL dosing
If the flows are higher than is practical for a chemical metering pump, try using a mag drive centrifugal pump (iwaki).
RE: HCL dosing
RE: HCL dosing
Its pretty typical to use them to draw liquid from a tote.
Here is an article: http:/
RE: HCL dosing
RE: HCL dosing
Positive displacement pumps usually have a built in relief valve to protect from over pressuring the discharge line. However, I would NOT leave the pump running all the time against a closed discharge. The relief valve could fail and you might not know it.
RE: HCL dosing
RE: HCL dosing
I worked for a company that was sued because they used the polytubing that came with the pump. We were pumping 50% sodium hydroxide and the tubing popped out of the pushlock fitting and sprayed a guy with chemical. They lost the lawsuit. (It wasn't my project luckily).
RE: HCL dosing
No arguments. Never, never!! install a positive dispacement pump without an external PSV. This PSV must be set below the design pressure of the discharge line. If you use a speed driver you barely can note if the pump is running when it goes at very low speed.
I suffered that some years ago, when somebody close the discharge valve and a cpcv line of caustic 32% expolded before my eyes. Furtunatelly, he and I used safety glasses and I just keep a little scare on my neck.
Internal PSV are designed to protect only the pump.
Regards
RE: HCL dosing
RE: HCL dosing
RE: HCL dosing
Mark Hutton