Mystery Tube

10 04 2009

What is this yellow tube for, and do I need to worry about it?
yellow_tube

The docs say:

The pumping station is fitted with air cooling which can be used for ambient temperatures up to 35 °C as standard. Conversion to water cooling is possible if required (water cooling on request).

Does this mean air cooling is included in the unit? Or do I need to attach an air pump (presumably to that yellow tube). What kind of pump/fan would I use?

There is a large fan pointed right at the base of the turbopump. I think that’s the built in air cooling. Also I wonder what the electronic component is just before the yellow tube.

Based on these docs, I think it’s a “Venting Connection”. But what is that? It’s seperate from the “Fore Vacuum Flange”

UPDATE

Talked to the maker of the pump (very helpful). Basically that tube is used when you want to re-pressurize the chamber. Sometime people use nitrogen for re-pressurization so water vapor doesn’t enter the chamber.

He said not to use the heater w/air cooling  (the heater is for bake-out of the pump). And he said to check the oil packet prior to use, which I’m doing now.

UPDATE2

The oil packet gets a clean bill of health from the manufacture, this pump is ready to rock:

oil_packet1

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One response

18 04 2009
physicsandcake

You usually vent the turbo unit after turning it’s power off, otherwise it takes hours and hours to spin down. It is sometimes a bad idea to vent the turbo from atmosphere when the blades are at full speed though, it can damage the unit. Some people have a controlled valve to vent it proportionally to the speed, others just crack the valve open really slowly, and some wait until it is at 1/2 speed to vent it straight to atmosphere.

As for cooling, try feeling the side of the pump whilst it is running at full speed. It should be warm but not hot – if it is very hot it may need water cooling. Most are OK though with no cooling, but manufacturers sometimes add an optional cooling attachment.

Good luck :)

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