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MisterWize
(Hive Bee) 12-07-03 20:30 No 475332 |
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Sufficient vacuum pressure? | ||||||
Swim was wondering if this water pump connected to a glass or stainless steel aspirator will suffice for all lab applications (eg. vac distillation of key products etc etc). Will a glass one make any difference to the strength of the vacuum? The pump itself has maximum height of 35m and can pump around 32 litres /min? can anyone help on this as I have done some basic reading on this but little has helped. Mw everyone has gotta start somewhere! |
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homeslice (Hive Bee) 12-07-03 21:57 No 475361 |
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How much Horse power is the pump? | ||||||
How much Horse power is the pump? I think 3/4 hp are recommended. Swim used to have an aspirator set up for vac distill but since returned his pump and bought a used vac pump that works MUCH better. Swim thinks he spent more money on ice to keep the water in the aspirator bucket cold than he spent on a whole new pump. That whole aspirator setup was inconsistent messy and loud as fuck. Take a look at ritchie yellowjackets which kinda resemble a bee ![]() ![]() mr president theres drugs in our residents |
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Rhodium (Chief Bee) 12-07-03 23:48 No 475383 |
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Aspirator Vacuum Station | ||||||
Aspirator Vacuum Station (../rhodium /equipm |
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Prince_Charles (Hive Bee) 12-08-03 15:39 No 475516 |
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Europe | ||||||
Vacuum pumps are much more expensive in Europe. However, you can construct a water-jet pump station in the UK for £ 60 or so. I compared the specs on several different laboratory water-jet pumps (aspirators): they required between 10 and 15 L/minute at between 1 and 2 bar (10-20 m hydrostatic head). The glass water-jet pumps don't seem to be any better in performance. Bibby-Sterilin polypropylene pumps seem to be as good as any. You can run (at least) 2 jet pumps from a water pump of that capacity. You can estimate the pump power required as follows (but this is secondary to the pressure and capacity requirements): e.g. 10 L/min at 1.5 bar SI Units (sorry Americans): 10 L/min = 0.167 L/s = 1.67*10E-4 m3/s 1.5 bar = 1.50*10E5 Pa Power = flow rate * pressure drop = 1.67*10E-4 * 1.50*10E5 W = 25 W Double power to allow for losses in plumbing Power = 50 W Assume pump has 50 % efficiency Pump electrical power = 100 W (1/7 HP!) Using too big a water pump and running the jet-pump at too high a flow rate won't increase its vacuum any further and will just dump more heat into the water. I was wondering whether to try running the water pump from a motor controller to reduce the effective power. HRH The Prince of Wales and Earl of Chester, Knight of the Garter, Rogerer of Servant Girls |
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Prince_Charles (Hive Bee) 12-09-03 10:23 No 475664 |
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A water jet pump (aspirator) like this: | ||||||
![]() And this is a pdf page from a catalogue with various jet pumps: http://www.geocities.com/wolfgang_boxhea I haven't measured the pressure of the set-up yet but it sucks like a tart on Hugh Grant's organ. I was thinking that if Yankees are using waterbed pumps that perhaps these are not as efficient as a laboratory pump and need more pressure and water flow to get a decent level of vacuum. I haven't managed to find a waterbed pump in the UK but then not as many Britons are sufficiently obese to require 10 hours a day lying in a flotation device. HRH The Prince of Wales and Earl of Chester, Knight of the Garter, Rogerer of Servant Girls |
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BieneMaya (Stranger) 12-11-03 16:45 No 476259 |
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I bought my high power vac pump used | ||||||
I bought my high power vac pump from an online auction. Ok it was sold as defect. But there was just a little corrusion in the inner pump. So I got it for about 30 $ incl shipping. It destills my sassy at about 90 Celsius. Look out for that old pumps. Either the engine is defect and can be easily replaced with some other old e- engine or there`s just a little corrusion in the pump that makes the enginepower unable to break through. But you can clean it and everything`s allright then. It took me just two hours. |
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baalchemist (Chef d'Equippe) 12-15-03 09:37 No 477014 |
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Most used high-vac pumps that are apparently... | ||||||
Most used high-vac pumps that are apparently 'seized-up' and sold cheaply, are easily repaired. Seizure is usually just a broken vane spring or the little shaft inside the spring is the culprit, also chunky sludge in oil compartment can cause binding. Easily replaceable vane springs & shafts , plus a good internal cleaning will get those old Cenco's & Welch's returned to duty once again. GODISNOWHERE Shoot Narcs, Not Drugs |
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