6024 King Edward 1

Yes, but we’d also put a liquid nitrogen trap in the circuit between pump and vacuum line to prevent the pump oil absorbing volatiles and reducing the efficiency, and I’d like to see the Swindon drawing for that!

Tom

 

As long as they don't condense oxygen
(Something I have never done and raises an eyebrow when someone says they have)

 

I always managed to avoid that one in several years of standing by a Schlenk line!

Tom

 

If you do it properly, you should avoid it!

 

The picture which you have attached is labelled Vacuum Pump.

 

Look closer!

Tom

 

It is labelled both Air Pump and Vacuum Pump.

I suppose it could be called the "Vacuum Maintaing Air Pump"

But what really matters is, why does it squeak?
Is that a fault, or is it an indication of a good seal around the piston?

 

I’m not going to comment on the cause of the squeak in case it leads to another forty posts!!!

 

Err so that’s 39 now …. sorry 38 ….

 

Well, you get the idea, must be there now.

 

Most other industries call that device an Exhauster.

 

I was an engineer in the chemical industry all my working life and firstly for our sins they were always referred to as vacuum pumps, be they recip, liquid ring or whatever.
However, in design and specification, we always used absolute pressure whatever kind of ‘pump’ we were specifying. This annoyed the factory staff who were forever asking how ‘strong’ a vacuum that was.

Equally they would use the most inappropriate names for key items of plant.
I was once dispatched 140 miles to N Wales to investigate a serious pump problem that was causing production shutdowns. On arrival I was directed to the factory engineer’s lair to be briefed. It went something along these lines …..

“Hello boyo, so you’ve been sent to wave your magic wand at the drum pump ‘ave you?”
“Drum pump, you’ve dragged me all this way to look at a drum pump? How on earth is dispensing from a drum causing the production line to grind to a halt?”
“Drums? What are you talking about? You boffins really are dim, it’s the Drum Pump isn’t it?” He reply exasperatedly.
“I’m sorry, I really don’t understand, what does this pump do if it’s not emptying drums?”
“Look you, it’s the main supply pump to the fibre spinning machines, bloody great lump of a thing with a 100HP motor, makes a heck of a din, you must know it!”
“Ah, you mean the 1st stage polymer pressurisation pump?
“What?”
“So why do you call it a Drum Pump ??”
.
.
.
“Because it’s made by Drum Ltd”


Plenty more where that can from, especially involving our cousins across the water …..