Not your standard plumbing question: pipework to plumb in pressure washer?

[crappy]

I want to plumb a pressure washer into the garage. Supply is already there.

I'd like to have the washer permanently connected and the high pressure side of it clipped to the wall and eventually passed through to the outside where I'll put a m22 connection on it.

If I understand correctly, standard 15mm copper pipe won't work. Is there anything which can handle the pressure or should I talk to a hydraulic shop?

 

[Madrab]

Even the lightest of duty pressure washer can reach around 100bar outputs, nothing in the plumbing world will cope with that consistently or safely. It'll need specific pressure washer hoses and couplers I would think.

 

[crappy]

Pretty much looking like that. Hydraulic copper pipe, 22mm, is only £33 for a 3m length which is OK. Now researching fittings and joints.

Got to love the Internet.

 

[Harry Bloomfield]

I want to plumb a pressure washer into the garage. Supply is already there.

I'd like to have the washer permanently connected and the high pressure side of it clipped to the wall and eventually passed through to the outside where I'll put a m22 connection on it.

If I understand correctly, standard 15mm copper pipe won't work. Is there anything which can handle the pressure or should I talk to a hydraulic shop?

That is rather specialist, you are looking at 100+bar. Normal household water pressure is around 2 to 5 bar. 1bar is 14 psi, a car type around 2 bar.

 

[UpgradeME]

You could use a pressure washer extension hose, clipped to the wall? They come in a variety of lengths and connectors.

 

[Harry Bloomfield]

Pretty much looking like that. Hydraulic copper pipe, 22mm, is only £33 for a 3m length which is OK. Now researching fittings and joints.

That might not stand 100bar, and joints will need to be threaded.

 

[crappy]

That might not stand 100bar, and joints will need to be threaded.

I don't recall the EN spec but when I looked it up it was safe to 251 bar and yes, all joints are compression also rated.

In short, I'm well out of the DIY plumbing world and well into the DIY hydraulic world .

What could possibly go wrong

 

[Harry Bloomfield]

What could possibly go wrong

Quite a lot, with 100bar behind it!

 

[Madrab]

Cant say I've ever seen Hydraulic copper pipe outside of standard water pipe (water is hydraulic of course)

Any reason you wouldn't use standard and bespoke extension hoses designed for pressure washers or your washer specifically? Wouldn't ever want to take chances with pipework at those kind of pressures. You'd typically pay around £20 for a 10m extension hose with couplers

 

[crappy]

To be honest, a bit of fixation. I need a short flexible coupler too. Gets expensive quickly.

Can I use existing stuff? My "challenge" is wall mounting the female coupler on the outside of the garage so I can just plug the lance in when I want it. Maybe I should look more.

 

[trojanhawrs]

I think it's a bad idea to have a constantly charged line at those pressures, you want to have facility to turn the pump off and drain the discharge after use. Small drips do not exist at 100 bar.

 

[Madrab]

Depends on the manufacturer really as to what couplers they use, supply.

TBH though, I have always ensured that the pressure is released from the washer/system before storing, I believe it's recommended my most manufacturers, otherwise the seals and the pump can fail prematurely.

 

[Hugh Jaleak]

Working with those pressures you'll need steel pipe, with threaded joints, and hydraulic hose for the flexible sections. There are quick release couplings available for water use, these Guys are one such company offering what you might need. https://www.gspen.co.uk/high-pressure-hose-adaptors-connectors-and-swivels.html

Don't skimp though, we are not allowed to use Brass fittings for safety reasons, I've seen the damage high pressure water can do to People, and it's not pleasant.

 

[trojanhawrs]

Depends on the manufacturer really as to what couplers they use, supply.

TBH though, I have always ensured that the pressure is released from the washer/system before storing, I believe it's recommended my most manufacturers, otherwise the seals and the pump can fail prematurely.

Mainly though, it's important the pump is turned off after use unless im misunderstanding the OP's intent

 

[Madrab]

I'd like to have the washer permanently connected

I think this may be the confusing comment.

It would not be advisable to have a pressure washer 'always on' so all you need to do is hit the lance to have it working. Was that you intention? When a pressure washer is no longer needed to be used it has to be powered down and the pressure released out of the line via the lance.