Harbor Freight 2.5 CFM Pump Setup?

[Plate Smacker]

I've seen some threads about using this pump.
Is there a setup to control vacuum?
What is max vacuum in inHg?
Anybody setup for bottle top filter care to share how they use it and their setup?
Is this pump too strong?
Is it as loud as a freight train?
Can it pump for 3 hours straight or will it explode?

Filtering Testosterone Decanoate and Nandrolone Decanoate. They flow a little slower than Enanthate and not trying to sit down with a hand vacuum for 3 hours filtering 400mL of each.

Using with bottle top filter and GL45 Glass media bottle. Autofil PP Funnel Assembly, 1000mL 0.2um Foxx Nylon

 

[RedSwingline]

I have the same pump. It works quite well. It ran for an hour filtering test D @ 400mg/ml in mig840. One thing to note is that it needs to run outside or at least in a well vented area is it is Not an oilless pump.

 

[enhancedbiohack]

Same. I've used that style pump forever. Filter the finished product warm and it's pretty simple and takes no time. No real set up required. I can't remember the size of the hose. It's not quite but nothing your neighbors will hear. The same style filtration as your Pic as well. I've got to get my set up out pretty soon. Unless you're brewing a massive amount, it shouldn't run for 3 hours.

 

[egruberman]

Do you need to pull a vacuum that deeply? I would think an oilless diaphragm style pump from Gast would be way less messy.

What is max vacuum in inHg?

75 microns is 0.00295 inHg.

There are some lab applications for deep vacuum (<500 microns) but I can't think of any common ones. The larger 2-stage oil filled pumps are nice for composite work, but typically they're used for HVAC applications. A deep vacuum is needed to remove any moisture or foreign gases from the refrigerant lines, which otherwise would shorten the life of the system.

 

[RedSwingline]

I am using this filter setup.

SF Stainless Steel Filter Holder, 500mL (180100-50)

SF Stainless Steel Filter Holder, 500mL (180100-50)

www.sterlitech.com

I have used both oilless and the HF, both work. The HF is about 20% faster with a .22 micron 47mm ptfe filter. The lines are 1/4”.

 

[Plate Smacker]

Do you need to pull a vacuum that deeply? I would think an oilless diaphragm style pump from Gast would be way less messy.



75 microns is 0.00295 inHg.

There are some lab applications for deep vacuum (<500 microns) but I can't think of any common ones. The larger 2-stage oil filled pumps are nice for composite work, but typically they're used for HVAC applications. A deep vacuum is needed to remove any moisture or foreign gases from the refrigerant lines, which otherwise would shorten the life of the system.

Seems kind of low on vacuum.
My hand pump is usually between
5 to10inHg

 

[egruberman]

Seems kind of low on vacuum.
My hand pump is usually between
5 to10inHg

Relative vs absolute. .003 inHg is an absolute measure. Presuming local atmospheric pressure is 29.92 inches of mercury then .003 inHg would be -29.917 inHg relative.

“Deep” vacuum is considered anything less than 500 microns or roughly -29.90 inHg.

It makes sense that a 2-stage pump would yield a greater flow rate than a diaphragm single stage pump. They have greater flow and pull a deeper vacuum. My main beef with them is dealing with the oil which absorbs moisture and needs to be changed frequently. The pump itself will also aerosolize the oil into the environment. I have an 8CFM professional grade HVAC unit that works great for composites and HVAC work, but I don’t like to run it indoors.

Gast diaphragm units are cheap as beans on eBay, just work for most things and need very little maintenance, mostly just occasional cleaning. I’ve picked up a number of units off eBay for tens of dollars that were seized up. Typically they can be disassembled easily, cleaned up and put back to use. The problem typically being that the pump ingested something that it shouldn’t have.