[services@arco.co.uk]

I have been delivering a lot of drain and sewer training modules of late. It’s seems that most experiences drain jetters only hand tighten the jetting nozzles. What is the opinion of you all. I have spoken to some manufacturers who have said that spanner’s must be used. Cheers John

[John]

Hi John

My advice is that nozzles should be “nipped” tight.

The thread should be fully engaged but not over tightened, the use of an oil-based thread lubricant should also be used to protect the threads and make sure fittings engage fully, safely and correctly.

John Jones

Emzotech.

[Mike]

Good day, I have been delivering Drain & Sewer Courses, since I started training and it’s my background in Water Jetting and on every practical element of the course I deliver, whether it is to a “Newbie” or an experienced, candidate we discuss jet connections to the hose and in 95% of the cases, all reply, “hand tight” and the trouble they have after jetting to undo the jet “by hand” the jet tightens up under pressure. I don’t know the technicalities or physics of why it is hard to undo after putting on “Hand Tight” but the industry goes for hand tight.

From a “Health & Safety” point of view, the jet only comes under pressure when in the pipework and I have never heard of a jet coming off, yes the whole fitting/connection and jet, can be propelled down the pipe, when hoses have been re-ended (in the past) or hoses are badly worn and not looked after.

[Author]

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