Author Topic: Experimenting with PPO impellers on biodiesel equipment (Read 13323 times)

Tony · « **Reply #30 on:** August 17, 2012, 11:50:38 PM »

Well my pump made a massive squeal today and the pressure dropped - took it apart and the impeller was all distorted and fell apart easily. Added the pics to the wiki page.

http://www.biopowered.co.uk/wiki/Pump_-_buyers_guide

Head Womble · « **Reply #31 on:** September 01, 2012, 09:33:10 PM »

Just cought up with this thread

How many batches did yours last Tony ?

Looks as if it faired better than mine did.

Tony · « **Reply #32 on:** September 02, 2012, 09:40:10 PM »

Just a couple - pretty poor really!

The biggest initial problem was that as the impeller softened the two faces curved into the gaps between them - the performance dropped significantly then. The material was obviously losing its rigidity and turning to cheese.

Head Womble · « **Reply #33 on:** September 02, 2012, 09:58:51 PM »

Sounds familiar.

Head Womble · « **Reply #34 on:** September 06, 2012, 09:56:42 AM »

I think we need to add to this thread that not all plastic impellors are the same,
I have a Stuart Turner 903 pump that was running my reactor for around 18 months and is now my dispencing pump,
this has been faltless thoughout this time.
So not all are unsuitable for bio use.

Tony · « **Reply #35 on:** September 06, 2012, 10:07:22 AM »

I guess Graham Laming wouldn't have had any success with his central heating pump if the impeller had crumbled on that so they must come in different flavours.

Mark, do you know the material used in the Stuart Turner?

Head Womble · « **Reply #36 on:** September 06, 2012, 11:41:05 AM »

No I don't, it's an old one that was given to me and all the info has rubbed off of the plate.

Here's a pic of it if it helps

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Experimenting with PPO impellers on biodiesel equipment