GraffBuster
New member
I hope this is the right section for this question. And I'm not a contractor, but I might be if I get all this stuff figured out.
Earlier today, I saw this jab by stan in another thread:
Besides being able to blast graffiti off of concrete walls, I was looking at the possibility of some work cleaning crusted cement dust off of covered hopper (railroad) cars. I've seen a recommended minimum of 3,046 PSI and maximum 5,077 PSI for that, so the 4,000 PSI machine should be about right.
From some formulas Paul Kassander posted, I've started looking for at least a 15 HP gas-engine unit. BTW, a trailer won't go a lot of the places my (intended) truck would go, so I'm looking at a skid-mount fed from a 250-gal. "IBC" water tank. Then both the skid-mount and the tank can be hoisted from the back of the truck so the truck can be used for other projects.
And now the real question in all this: can the pressure of that 4,000 PSI unit be scaled back enough to not dent the walls on any future residential jobs? Without shutting off the pump completely, what would be the lowest practical pressure available?
(Let's see what the noob has learned so far: "The zero-degree tip would probably not be optimal for most residential washing." How's that? )
Okay, that's one question down, at least nineteen more to go.
Earlier today, I saw this jab by stan in another thread:
I had already decided to "go big or stay home," figuring on getting a machine (preferably hot/cold) that will do at least 4 GPM and 4,000 PSI, but that clinched it.My new (Sam's) unit is a 2.7gpm at 2300psi machine and I am gonna clean up Atlanta.
Besides being able to blast graffiti off of concrete walls, I was looking at the possibility of some work cleaning crusted cement dust off of covered hopper (railroad) cars. I've seen a recommended minimum of 3,046 PSI and maximum 5,077 PSI for that, so the 4,000 PSI machine should be about right.
From some formulas Paul Kassander posted, I've started looking for at least a 15 HP gas-engine unit. BTW, a trailer won't go a lot of the places my (intended) truck would go, so I'm looking at a skid-mount fed from a 250-gal. "IBC" water tank. Then both the skid-mount and the tank can be hoisted from the back of the truck so the truck can be used for other projects.
And now the real question in all this: can the pressure of that 4,000 PSI unit be scaled back enough to not dent the walls on any future residential jobs? Without shutting off the pump completely, what would be the lowest practical pressure available?
(Let's see what the noob has learned so far: "The zero-degree tip would probably not be optimal for most residential washing." How's that? )
Okay, that's one question down, at least nineteen more to go.