Is 15mm Sufficient for Flow and Return

[jeff the gasman]

You've never bought a Salus pump then Tony.

 

[Agile]

Are you suggesting that Salus pumps have any particular common failure mode?

I normally only use proper pumps like Grundfos and Wilo.

 

[Dan Robinson]

I would be very reluctant to take something said by a salesman for a manufacturer as definitely correct.

Most pumps can work at any power up to their rating for any proportion of the time.

The only part of a pump to fail is the bearing and when turning there is no stress at all on the bearings apart from any small out of balance pressure regardless of how hard they are pumping.

The winding have exactly the same stress on them all the time and that has no effective effect on the life expectancy.

Pumps can theoretically work for ever apart from bearing wear and that is usually accelerated by dirt in the water.

Tony

For a start he was a field engineer, so I had no reason to doubt him.

The burnt out pump windings must have been a figment of my imagination then

 

[bernardgreen]

when turning there is no stress at all on the bearings apart from any small out of balance pressure regardless of how hard they are pumping.

There is some small asymetrical lateral pressure on the bearing due to a reactive force that is equal and opposite to the force that is pushing fluid out of the impellor chamber. This does lead to some uneven wear in the bearing with more wear on the side of the bearing opposite the exit port. Some centrifugal pumps have double volutes to reduce this effect.

Read all about pumps https://www.myodesie.com/wiki/index/returnEntry/id/2960

and Mr Bernoullis and his formulas for luid flow rate https://www.myodesie.com/wiki/index/returnEntry/id/3006

Heat transfer help https://www.myodesie.com/wiki/index/returnEntry/id/2993

 

[Steelmasons]

This thread is hilarious.....so called "professionals" spouting absolute BS...
.....another keyboard fooked..

 

[Steelmasons]

....and as for you Bernard...I wouldn't trust you to change a light bulb unless logged into Google.

 

[bernardgreen]

.and as for you Bernard...I wouldn't trust you to change a light bulb unless logged into Google.

google is so yesterday.

I happened to have been on myodesie so looked on there to find a mention of pump bearing wear as I knew from experience that the hole in the sleeve sleeve bearing on some big pumps did become egg shaped. It was poor design to use a sleeve on that particular size of pump and later they fitted pumps with roller bearings.

And by the way..... bulbs grow in the earth, even the heavy ones.

 

[dilalio]

And by the way..... bulbs grow in the earth, even the heavy ones.

Light bulbs don't...
https://www.google.co.uk/search?q=light+bulbs&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari

Every electrician who uses that one on me gets his cables cut when he tries to use one of my 'pipe ways/holes' for his cable

 

[PullerGas]

My wee App gave me the following result;
15mm copper tube will do.
8KW heat load.
70F/50R - 20Delta T
20M tube length, 10elbows, 2tees.
Flow rate 0.35M3/h
Water velocity 0.55M/s
Pressure drop 0.9 mWC
Pressure drop 2.8mWc/100M

Stick in 22mm main F&Rs, you know it makes sense!!

 

[PullerGas]

There is some small asymetrical lateral pressure on the bearing due to a reactive force that is equal and opposite to the force that is pushing fluid out of the impellor chamber. This does lead to some uneven wear in the bearing with more wear on the side of the bearing opposite the exit port. Some centrifugal pumps have double volutes to reduce this effect.

Read all about pumps https://www.myodesie.com/wiki/index/returnEntry/id/2960

and Mr Bernoullis and his formulas for luid flow rate https://www.myodesie.com/wiki/index/returnEntry/id/3006

Heat transfer help https://www.myodesie.com/wiki/index/returnEntry/id/2993

......He's a fooking cracker!!

 

[dilalio]

Stick in 22mm main F&Rs, you know it makes sense!!

And it just fookin looks right to boot

 

[dilalio]

Do we prefer big tits or tits just big enough to feed a baby?
Maybe that's the 8 pints of San Miguel talking

 

[dilalio]

Do we prefer big tits or tits just big enough to feed a baby?
Maybe that's the 8 pints of San Miguel talking

And before anyone takes offence... I was referring to birds of a feather... Bit of a twitcher, am I.

 

[DP]

Tony, Capacitor can fail, water can leak into the winding

 

[DP]

Edited