[derek west]

lpm is litres per minute so obviously that is how much water comes out the end of the wand per minute, thats easy to understand.

can someone try and explain BAR and psi, yeah yeah psi is pounds per square inch, but i need to suss out the relevance between the 3 to help me buy the right machine, i have 4k to spend so need to get it right. been looking at the ZETA which only produces 3000 psi at 200bar, but at 30 lpm, yet the honda 390 produces 3600 psi at 250 bar, but only 15lpm.

its all very confusing

can someone who really knows his stuff explain it to me like there trying to explain it to a 10 year old cos i just can't quite get my head round it all.

[Andy Foster]

bar and psi are both measurements of pressure, (like pounds and kilos are both measurements of weight).

The pump you have bolted onto your engine will give you a pressure capability (bar/psi) and a flow rate (lpm).

Honda only manufatures the engine (probably the best to get for value for money) and the pump will be manufatured by someone else (interpumps for example).

If you go for somewhere between 2500 and 3000 psi (180 bar to 200 bar approximately) and a flow rate of between 14 and 20 lpm you should be fine.  Any higher on the flow and you are going to struggle with supply and any higher on the pressure and you will have to buy the more expensive hoses, triggers etc (Most are rated to 3000ish psi).

Hope this helps

Andy

[Nathanael Jones]

Some kinds of work like drain cleaning & softwashing benefit greatly from a higher flow rate. There is a gearbox pump for 13hp machines that will kick out 21lpm @3000psi which would be more than enough for most jobs.

Personally I'd say 15lpm and 2800psi would be a good minimum, but obviously the higher the better. Low pressure can be worked with by using a turbo nozzle,.. low flow rate leaves you with no option.