I'm curious if there are any ways to pump a fluid without the fluid going through the pump head. The reason(s) for this is the fluid could be corrosive to the pump or the temperature is too extreme for the pump. In this case the fluid is used to either cool or heat something.

In the ideal situation where the pump can handle the extreme conditions, the fluid would be pumped into the chiller and then through the piping that cools the equipment (say motors or transformers) and then back to the motor and into the cooler again. In thecase I'm workign with the fluid starts very cold (and probably corrosive) so the pump has to deal with that

Option 1 - gravity - The cooled fluid is stored in a vessel, say 5 gal drum and on the other end is a receiving 5g drum - both have a vent hole to allow the ingress and egress of air. The container holding the flid is raised to the height needed for the flow rate required and then reversed when flow is complete. AS it flows from one vessel to vessel it passes through the cooling coil around the equipment.

Option 2 - similar to above but both 5gal containers have a diaphram where either fluid or air can be pumped in . As the diaphram expands, the fluid in the container is pumped out. This is pretty much how water pressure works in houses with wells, the water storage tank is filled and the diaphram creates the water pressure.

Are there any other methods that may be used to pump a liquid without it going through the pump head?

 

A peristaltic pump. The fluid goes through a flexible tube that is mechanically manipulated externally.

https://en.m.wikipedia.org/wiki/Peristaltic_pump

 

Us knowing what the fluid is and what temperature it is at would help.

As for corrosiveness there are pumps that handle fluids with PH values of o and 14 which are the limits of how basic or acidic a substance can get.

As for heat there are pumps that pump liquid salts at over 3000 F which I suspect is way beyond what your 5 gallon buckets will handle.

 

Liquid salts would obviously not work with a plastic bucket but some of the 5g SS drums I have would work with some. That's not really the issue though as that is way out of the parameters I need.

Low temp would be -110F but possibly down to -170 but that would be improbable as it would require much more preparation on setup. The liquids would be isopropyl, ethyl or methyl alcohol and maybe a mix of ethylene and propylene glycol. Calcium Chloride solutions may be used in conjunction with an alcohol to increase density of the fluid to allow for more cooling per flow rate.

I think pH will be +/- 2 from a neutral 7.

If this is used for pumping hot fluids it will be oils, mainly vegetable oils & animal fats at an upper temp of 350F but would focus more on the area of 150-200F. I think pH for these oils/fats usually ranges at 5 - 5.5.

Lastly a super saturated solution of KCl (potassium chloride) and water. Max temp would be 212 (although I might try 2ATM giving about 245-250F..)

The piping/tubing used would be SS or copper depending on application and insulated. IDK what tubing can be used with the peristatic pump but that is an excellent idea for other applications I am looking at.

 

I'm curious if there are any ways to pump a fluid without the fluid going through the pump head. The reason(s) for this is the fluid could be corrosive to the pump or the temperature is too extreme for the pump. In this case the fluid is used to either cool or heat something.

In the ideal situation where the pump can handle the extreme conditions, the fluid would be pumped into the chiller and then through the piping that cools the equipment (say motors or transformers) and then back to the motor and into the cooler again. In thecase I'm workign with the fluid starts very cold (and probably corrosive) so the pump has to deal with that

Option 1 - gravity - The cooled fluid is stored in a vessel, say 5 gal drum and on the other end is a receiving 5g drum - both have a vent hole to allow the ingress and egress of air. The container holding the flid is raised to the height needed for the flow rate required and then reversed when flow is complete. AS it flows from one vessel to vessel it passes through the cooling coil around the equipment.

Option 2 - similar to above but both 5gal containers have a diaphram where either fluid or air can be pumped in . As the diaphram expands, the fluid in the container is pumped out. This is pretty much how water pressure works in houses with wells, the water storage tank is filled and the diaphram creates the water pressure.

Are there any other methods that may be used to pump a liquid without it going through the pump head?

What is the container and tubing made of? Can't the pump be made of this material? Stainless steel you said. No problem making a pump out of that.

 

A peristaltic pump. The fluid goes through a flexible tube that is mechanically manipulated externally.

https://en.m.wikipedia.org/wiki/Peristaltic_pump

Silicon tubing? Typical rated temperature and pressure is about 70 deg F at 5 PSI, bursting at 15 PSI.
I don't remember him stating a pressure.
.

 

I'm curious if there are any ways to pump a fluid without the fluid going through the pump head. The reason(s) for this is the fluid could be corrosive to the pump or the temperature is too extreme for the pump. In this case the fluid is used to either cool or heat something.

In the ideal situation where the pump can handle the extreme conditions, the fluid would be pumped into the chiller and then through the piping that cools the equipment (say motors or transformers) and then back to the motor and into the cooler again. In thecase I'm workign with the fluid starts very cold (and probably corrosive) so the pump has to deal with that

Option 1 - gravity - The cooled fluid is stored in a vessel, say 5 gal drum and on the other end is a receiving 5g drum - both have a vent hole to allow the ingress and egress of air. The container holding the flid is raised to the height needed for the flow rate required and then reversed when flow is complete. AS it flows from one vessel to vessel it passes through the cooling coil around the equipment.

Option 2 - similar to above but both 5gal containers have a diaphram where either fluid or air can be pumped in . As the diaphram expands, the fluid in the container is pumped out. This is pretty much how water pressure works in houses with wells, the water storage tank is filled and the diaphram creates the water pressure.

Are there any other methods that may be used to pump a liquid without it going through the pump head?

Is pressure a factor? Is viscosity of the fluid a factor? Required liters per second?
How hot does cooking oil get? No problems finding pump for that.
The less specific you are about what youer needs are the less anybody can help you.
-170 deg are we looking at a cryo pump?
We play 20 Questions before we can help.
+ or - 2 pH would not seem to be much of a problem.

 

Conventional industrial pumps handle these sorts of things all the time. I haven't heard anything unusual except the cold temperature, which would create challenges. Ambient moisture freezing on the pump is one, seal lubricant is another. You'll need explosion proofing since you have flammable solvents.

 

Hmm. this sounds like a list for making biodiesel except for the cryogenic aspects.

If so I would just use a common hydraulic gear pump or agricultural roller pump for the oil/heavy hydrocarbon fluids and a separate brass pump for the alcohols and a third stainless steel or high nickel content agricultural roller pump heavy base stock.

As for the cryogenic part I have no clue without knowing the what and why of that part of the system.

My first suggestion would be a solid brass cryogenics gear, rotary vane or roller pump like what is used for liquid oxygen nitrogen and other cryo fluid transfer systems that has teflon seals.

Considerably more information on what the whole concept is for would be much helpful assuming this isn't all just an exercise in fanciful dreaming.

 

Depending on other circumstances, you could try a Venturi Pump

But my question is why are you looking for an all-in-one pump? You're not using the cold stuff at the same time you're using the hot stuff, so why not two different pumps?

 

Well the pump needs to handle very cold temps when pumping some chilled alcohols and other similar substances as the circulation for a cooling system. The pump will also need to move basically the same volume/pressures of higher temp liquids in another application. The reason is some of these items are pretty expensive and if there was one material that could handle both that was at an attainable price, that would solve the problem. I'm wondering about looking into PTFE coatings (>.5mm thick not mils) but am not sure how it works in cold temps.

 

316L or 310 stainless works just fine down to liquid nitrogen temps. The right Seals are the key to success.

Chloride stress corrosion will eventually be an issue if chloride solutions will be in regular contact. Try a nitrate or nitrite salt instead.

Ps, if you add alcohol to CaCl2 solution, the salt will precipitate.

PSS: how do you plan on preventing the SUPER saturated solution of KCl from precipitating while you are pumping it? What's wrong with a simple saturated solution of KCl?

 

RE:"The reason(s) for this is the fluid could be corrosive to the pump or the temperature is too extreme for the pump"

About ~1970 here in Latvia, Salaspils institute of physics, magnetism labs had elaborated innovative process MHD and later EIMAO intended for deadly radioactive up-to-mad-superheated non-magnetic liguids pumping, later they pumped 1000C pure alkali (potassium) in 20m3 closed loop etc respect-causing wonder-works. They are working until now and selling their pumps to many high-tech projects like TOKAMAK and many more (http://ipul.lv/main/), but need to say, it isn`t cheap indeed such joy.

The core of idea is that near but outside of non-magnetic pipe with those mad-state-liquid is created disc with rotating very strong magnets SN-NS-SN-NS. For example, 32mm boron or tungsten pipe stays at few tenths of mm away of samarium magnets, say 100 pieces fixed on 20cm cooled aluminium disc, what rotates at 3000rpm. In the result, the massive Foucault swirls are produced into chosen devilish liquid and it is forced to move upward the pipe with more than impressive force, what even at so small turns like 60rpm are in many kilograms by touch of hand (they has such stand there where clientele may swirl it by hand to feel the real scale of forces into device). Very impressive play-piece indeed.

But coming back to the Earth, the most prost would be the moving by pressurized gas or by vacuum, or by gravity.

By the way - most of the pumps except the very special are made of steel "just the normal". And this is material is those which become in super-brittle state while in the temperature below some minus 20C or best case minus 40C. Happens that railway rail kid may crush with just the hit of the flip, if it is very cold (what are sometimes used by burglars). I am quite sure Your pump will have a progressive un-explainable cracks in un-immagineable parts, like shafts, pistons, valves, cylinders or even the main housing at LN2 temperature range. Surplus oiling system will fail without of a least moan. Don`t use the non-dedicated pumps at cryogenic temperatures.

 

Why move the fluid? You can move the heat load away from the source, all you need is a heat exchanger and then drive off the heat elsewhere with a refrigeration unit.

kv