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Old 16-01-2018, 05:50 PM   #71
markcaughey
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Quote:
Originally Posted by Soapybubbles View Post
So me going from a 8m hose to 15m will I lose much pressure/flow?




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Good question. Im considering either 20-25 meter hose will this have an effect on pressure or flow ? Im using Karcher K7
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Old 16-01-2018, 06:18 PM   #72
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Originally Posted by markcaughey View Post
Good question. Im considering either 20-25 meter hose will this have an effect on pressure or flow ? Im using Karcher K7
Your K7 is rated at 10l/min maximum, or roughyl 2.65 USGallons per minutes, so pressure loss in PSI over a 100ft (30m) length is going to be somewhere around 300PSI on 1/4" hose (6mm, DN06 single wire) and ca 100PSI using 5/16" hose (DN08 twin wire).

300psi = 20 Bar
100psi = 7 Bar

Remember that a fair amount of the pressure loss is frictional, so the bigger diameter allows a lot more water to flow through the middle rather than being slowed by the wall contact.

It's probably not strictly linear relationship with hose length but for 20m you could expect ca 200psi (14 Bar) drop on 1/4" bore, 60psi (4 Bar) drop on 5/16"

There are lots of other factors at play, so i wouldn't get too hung up about it. At 20-25m length you probably want to be using twin wire hose anyway. Of course that comes with some disadvantages in handling (relative stiffness) and storage (bulkier, heavier).

Last edited by percymon; 16-01-2018 at 06:29 PM.
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Old 16-01-2018, 06:26 PM   #73
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Quote:
Originally Posted by spyk3d View Post
Thanks SG.

Its a standard threaded connector as per the below.

That looks like an M22 connector, if so it's very straightforward to adapt to male or female 3/8" BSP threads. No need for intermediate hoses, I don't think.

Edit eg:

https://rover.ebay.com/rover/0/0/0?m...2F271417239383

or

https://rover.ebay.com/rover/0/0/0?m...2F271417204010

Last edited by steelghost; 16-01-2018 at 06:40 PM.
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Old 16-01-2018, 06:43 PM   #74
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Quote:
Originally Posted by Soapybubbles View Post
So me going from a 8m hose to 15m will I lose much pressure/flow?




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How much will I lose?
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Old 16-01-2018, 07:11 PM   #75
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Quote:
Originally Posted by Soapybubbles View Post
How much will I lose?

K5 is 8.33l/min max, or 2.2 USGallons / minute

To quote steelghost from page 4..

Quote:
Originally Posted by steelghost View Post
This is an interesting resource to size the pressure loss you might experience.

It's all in US units, but 2 US gallons per minute is about 7 litres a minute; 1/4" hose is roughly 6mm ID (ie DN06), and 5/16" hose is approx 8mm ID (DN08). Pressure loss reduces at lower flow rates.

20 psi is 1.37 bar, so for a 30m (~=100ft hose) you're talking a 12 bar loss in pressure for DN06 hose, vs a 4 bar loss for DN08 hose (at 7.6lpm)
So i'd add about 15% onto those numbers for a K5, so 14 bar loss on 30m DN06 or 4.5Bar on DN08 hose.

For 15m length half those numbers, for 10m you'll be 5Bar loss, 2 bar loss respectively. Hardly worth worrying about the hose spec with 10m lengths
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Old 16-01-2018, 08:22 PM   #76
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I did read somewhere on a US power washer vendor "blog" that pressure loss was only worth worrying about for hoses over 100ft ie about 30m. These numbers seem to bear that out.
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Old 16-01-2018, 11:31 PM   #77
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For information purposes for anyone with karcher looking to upgrade their hose and have it Re useable to another machine. Here is what I have ordered from Damian at Qwashers. (Please bear in mind I have already upgraded my lance here) http://www.detailingworld.co.uk/foru...&postcount=109

1 X 15 METER HOSE 1/4 1 WIRE BLACK WITH CUFFS 3/8 MALE X 3/8 FEMALE £42. 05
1 X KARCHER BRASS MALE PROBE X 3/8 MALE £7. 80
1 X POSTAGE £9. 00
1 X PAIR BRASS MIDI QUICK RELEASE £6. 57
TOTAL £65. 42

Last edited by Soapybubbles; 16-01-2018 at 11:38 PM.
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Old 16-01-2018, 11:42 PM   #78
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Quote:
Originally Posted by Soapybubbles View Post
For information purposes for anyone with karcher looking to upgrade their hose and have it Re useable to another machine. Here is what I have ordered from Damian at Qwashers. (Please bear in mind I have already upgraded my lance here) http://www.detailingworld.co.uk/foru...&postcount=109

1 X 15 METER HOSE 1/4 1 WIRE BLACK WITH CUFFS 3/8 MALE X 3/8 FEMALE £42. 05
1 X KARCHER BRASS MALE PROBE X 3/8 MALE £7. 80
1 X POSTAGE £9. 00
1 X PAIR BRASS MIDI QUICK RELEASE £6. 57
TOTAL £65. 42
If Damian isnt assembling it all you'll need some PTFE tape (or more preferable blue threadlock, NOT red threadlock) and bonded seal washers (or Dowty seals) for each of the screw threaded joints.

Is the QR at the gun end, added to the swivel , or at the PW end for removing the hose for storage ?
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Old 16-01-2018, 11:47 PM   #79
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Originally Posted by percymon View Post
If Damian isnt assembling it all you'll need some PTFE tape (or more preferable blue threadlock, NOT red threadlock) and bonded seal washers (or Dowty seals) for each of the screw threaded joints.

Is the QR at the gun end, added to the swivel , or at the PW end for removing the hose for storage ?
He assembled my gun for me so I'd assume he will do the same again, I do have Ptfe tape here any ways

The QR is going on the gun end straight onto my swivel
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Old 16-01-2018, 11:51 PM   #80
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Originally Posted by percymon View Post
If Damian isnt assembling it all you'll need some PTFE tape (or more preferable blue threadlock, NOT red threadlock) and bonded seal washers (or Dowty seals) for each of the screw threaded joints.
I have some red thread lock in the tool box and had in mind to try it on some of the joints in my setup (especially the ones where dowty washers cannot be used) - am curious why it's unsuitable? The stuff I have simply says you need hand tools to loosen joints bonded with it; seems reasonable if you want to have the option to disassemble it at any point in the future!

Last edited by steelghost; 17-01-2018 at 12:08 AM.
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