Rank: Guest 
|
Posted By Robert.
Anybody any thoughts or experience in the use of this, especially in relation to HSG47?
|
|
|
|
|
|
Rank: Guest
|
Posted By STEVE
Robert
Work in both these Industries, what is it you ned to know
STEVE
|
|
|
|
|
|
Rank: Guest
|
Posted By Frank Hallett
Likewise Robert.
HS[G]47 isn't a small document, what exactly is the problem?
Frank Hallett
|
|
|
|
|
|
Rank: Guest
|
Posted By Robert.
Steve / Frank
Sorry didn't get back.
HP and UHP (and vacuum) excavation in relation to ultility avoidance as a "safer" alternative to hand digging to expose.
Assuming competence, and correct PPE etc etc.
Could the operator be at risk if the HP / UHP jet was directed at a known but buried potentially hazardous utility (HV, LV, Gas etc).
I'm convinced that he would be, as he wouldn't know the mechanical "condition" of protection of the utility. ie chaffs in any insulation etc that could be weak enough to allow penetration under pressure. Is there a really safe way to expose aburied utility. Our client in US is convinced that it is safe, for utility exposure,I am not.
So if it is used in the UK for utility exposure I would like to be aware of the pitfalls. Any info would be appreciated.
Robert
|
|
|
|
|
|
Rank: Guest
|
Posted By allan wood
i have used both H.P. & U.H.P. in the past but never to expose services, however i have used U.H.P. to demolish concrete (hydro-demolition) and to strip defective paint coatings from steelwork with great efficiency, as for exposing services i am quite sure that the U.H.P. jet would penetrate the services.
with U.H.P. you would be using pressures of up to 36,000 p.s.i. with a flow rate of between 20-40 litres per minute maybe even more.
there have also been some nasty injuries to persons using this type of equipment due to high pressure injection, even amputation of limbs.
i have seen & heard of compressed air being utilised to expose the said services and i am sure there is now a specific tool available on the market cant remember what it is called now.
|
|
|
|
|
|
Rank: Guest
|
Posted By Robert.
Thanks Allan
|
|
|
|
|
|
Rank: Guest
|
Posted By allan wood Robert, have a look at this web site www.rentajet.co.uk this will illustrate the practical usage of U.H.P. equipment.
|
|
|
|
|
|
Rank: Guest
|
Posted By Stuart Nagle
Some years ago I recall seeing a video on the use of high pressure air lances in the excavation of trenches as a safe way of preventing damage to sensitive underground equipment. I have not heard of using high pressure or ultra high pressure water jetting for the same purpose - only in respect of mining operations in open cast mines, and water pressure at high or ultra high pressure would I am sure be just a likely to damage a sensitive piece of equipment as would a good old stab with a spade!!
Speaking as one who used highpressure water jetting in sewage operations I have been witness to what damage it can do to 'hard' materials (concrete and glazed clay pipes) if not used wisely by trained operatives.
Are you sure this is the right application?
|
|
|
|
|
|
Rank: Guest
|
Posted By Frank Hallett
Sorry for the delay in responding to your additional post Robert.
The previous responders have said very much what I would say - HP jetting is used to remove substantial blockages in sewers & drains and has been known to "blow" joints and cause no end of flooding, subsidence and pollution problems; UHP will, as previously advised, is frequently used as a drilling or cutting medium and expose any flaws in a buried service water repellant/tightness.
Not what I would consider as a "non-damage" or generally recommended method of exposing services.
Frank Hallett
|
|
|
|
|
|
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.