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Anttoeknee

  • Posts: 7
Dual feed ?
« on: July 13, 2020, 09:56:10 am »
Morning all

Will be purchasing a PW with a 21LPM flow rate . I’ve just seen a video claiming to get the 21 LPM flow rate you need a dual feed into the machine.  Surely a single feed from a water butt / tank with a good suction hose suffice?   From looking most only have a single feed.

Smudger

  • Posts: 13438
Re: Dual feed ?
« Reply #1 on: July 13, 2020, 01:06:05 pm »
That sounds like q washers to me

Twin feed is ok - however it suffers from water turbulence - on the rear feed it enters the pump from a right angle bend in the pipe - for the most part this is fine but on many occasions I ended up with a stutter in the machine - a local p/w company to me pointed out that the plumbing was not the best and should be a single feed but with a straight 1" diameter hose feed

Since that change I don't get stutter or air into the p/w and feel that the pump pushes out a better pressure on a consistent basis

Darran
Never argue with an idiot, they will only bring you down to their level, and beat you with experience

Anttoeknee

  • Posts: 7
Re: Dual feed ?
« Reply #2 on: July 13, 2020, 04:29:20 pm »
Thanks. 
If I purchased a wheelie bin and used this as a water tank I wouldn’t have any problems having a outlet at the bottom or would I be better just placing the suction inside ?

Smudger

  • Posts: 13438
Re: Dual feed ?
« Reply #3 on: July 13, 2020, 04:38:04 pm »
When I used a wheelie bin I had the outlet at the bottom - better when starting a job as the pump doesn't need to suck air and with the outlet at the bottom the weight of the water keeps you with a good supply to the pump

be aware if the mains pressure is pants a wheelie bin will only give around 15 mins of p/w time

I'd also invest in 3/4" hose like tricoflex from the mains tap to wheelie bin as this allows faster filling

Darran
Never argue with an idiot, they will only bring you down to their level, and beat you with experience

Mike Halliday

  • Posts: 11581
Re: Dual feed ?
« Reply #4 on: July 15, 2020, 07:57:23 am »
I use a 30/lt machine with a single feed I have a couple of pumps at 40lt/min that are set up for single feed. It you use the correct bore supply hose with the matching bore fitting then single feed is fine. But I often see hydraulic fittings that have a much smaller internal bore size, this is because they need to be rated for a very high pressure rating, but supply hose is not under pressure, so you could use plastic or brass fitting which internally is much wider
Mike Halliday.  www.henryhalliday.co.uk

Smudger

  • Posts: 13438
Re: Dual feed ?
« Reply #5 on: July 15, 2020, 05:11:19 pm »
good point mike
Never argue with an idiot, they will only bring you down to their level, and beat you with experience

zesty

  • Posts: 2452
Re: Dual feed ?
« Reply #6 on: July 27, 2020, 07:45:59 am »
Single feed, jetmac did a video on this. Have a look on YouTube!

Good point about the internal diameter of the couplings. Same applies to window cleaning hoses.