This past January, when the temp hit 5 degrees for a high and the wind made it feel like -15, I got a call from my father-in-law. The Christian school had exposed a 6" drain pipe to pour a new foundation for a portico. Well when s**t hits these temps, it's just a wall of frozen stoppage. I took my, until then, nicely winterized system and started to make plans to clear this stoppage with hot water and drain jetting devices. But first I had to clear the ice that I discovered had setteled into my pw hose. Next came an hour of trying to get the engine started with a frozen carburator (a story in itself). Finally, I get to the job and discover that someone (the backhoe operator) had broken the pipe (and I mean really busted it up) and used duct tape to make a temporary fix until they got around to laying the foundation for the portico. I then contacted my dad-in-law and had him send the needed supplies to repair the breach for when I cleared the stoppage. At least this would make it easier to access the stoppage. By the way, it is STILL FIVE DEGREES with a 20 knot wind ON A HILL, with NO TREES.
I hook up the pw to the jetting valve, I check all connections, and I put the tip on the end of the jetting hose. And I think to myself, I wonder if there are any ice bits that might jam the tip of the hose. NAWWWW, I did to good a job of defrosting the hose back at the shop. Should I put the blow-by gate valve on the hose in case of a blockage in the line? NAWWW, I'm sure it's A-OK.
I fired up the pw, flipped on the burner, and pulled the tirgger.
And cursed myself for the next half-hour. I shot a clot inside of two-seconds. It's less than 5 degrees, my system is now at 3000 psi, and not one drop of water is coming out of the nozzle. Shut down the engine and burner, wrestle with the impossible QC's, and frantikly wonder what to do. I now know that I could actually have unscrewed the QC (yes at 3000psi) with no hope of ever finding it again as it shot of my hose at God know's what velocity, but I didn't do that. What I did resort to came as a result of having disconnected my by-pass hose from my tank, so as not to fill my tank with 150 gallons on the coldest days of the year.
As I stood in the ditch, looking at the incredibly frozen drain pipe, my incredibly pressureized hot water pw system, and my incredibly cold helper, I noticed that the water I had hooked up to was flowing from the disconnected by-pass line. THEN light dawned.
I disconnected everything that wasn't under pressure, threw what was under pressure inside the covered trailer pw, and proceeded to cram the simple garden hose up the 6" drain pipe. My rationale was that, since the water, cold though it was, was running (A LOT), it was warmer than the ice that I originally went out there to dislodge. I rammed the hose up the pipe until I hit stoppage, and my helper pounded on the exposed exterior of the pipe. Within twenty minutes we had worked our way up 15 feet of frozen s**t to receive a glorious reward of a few more gallons of what had triggered the school to the problem in the first place (the unfrozen stoppage stuff). Satisfied with our success, we replaced the four foot section of damaged pipe wrapped up what little garden hose was needed, and drove off to find a way to thaw my quickly solidifying profit center.
The only damage suffered was a rupture in a newer hose, and a bruised ego. If I had either blown out the line before putting on the tip, or put in the blow-by valve, I could have done the job as planned in about five minutes.
I hope some of you have learned from my mistakes, and I hope I have one that nice little telescoping pole ;-)