Cost for trenching water pipe.

[jd6820]

In good clean ground with a 3-5ton want to be digging and lay 180-230m a day, a trencher of a good size will piss 500-600m a day in good clean ground no rocks, any rocks or stones and you’ll be cursing it

Agreed, I worked for a land drainage contractor and regularly put 1000m in a decent day (normal working hours),this included setting in or t-ing into a main. But running at 3ft deep. Not sure how deep you'd need to go with the water pipe but I'd say a trencher would be the way forwards.

 

[Big Jordy]

Water pipe needs to be a minimum of 30 inchs deep.. but bare in mind that for every 33ft you lose a bar of presssure off a main so if the 2000m is going up hill

Jordan

 

[Antony Holmes]

Water pipe needs to be a minimum of 30 inchs deep.. but bare in mind that for every 33ft you lose a bar of presssure off a main so if the 2000m is going up hill

Jordan

that's probable why using 63mm to reduce the friction loss to help with the pressure loss

 

[Big Jordy]

Standard blue 3/4 poly rated at 12 bar and so is 1inch and again depends what type of 63mm it is mdpe hppe or pvc nearly all the same pressure rating for water... friction loss not really a massive issue with water... and suppose his 63mm could be coming off a pumping main aswell... but at 63mm gona have to be tee'd off the main not just a case of tapping the main with a ferrule... i know over here to tee into a main is big bucks 1250 quid for a tapping so can only guess

Jordan

 

[fred]

Standard blue 3/4 poly rated at 12 bar and so is 1inch and again depends what type of 63mm it is mdpe hppe or pvc nearly all the same pressure rating for water... friction loss not really a massive issue with water... and suppose his 63mm could be coming off a pumping main aswell... but at 63mm gona have to be tee'd off the main not just a case of tapping the main with a ferrule... i know over here to tee into a main is big bucks 1250 quid for a tapping so can only guess

Jordan

i would disagree with this.

Big diff between 25 and 32mm for a house feed. Certainly noticeable when 2 showers are being used.

 

[V8Druid]

i would disagree with this.

Big diff between 25 and 32mm for a house feed. Certainly noticeable when 2 showers are being used.

but that's all down to volume ..... the 32 is 40% bigger volume, for the flow required at a given / fixed pressure

 

[fred]

and less resistance due to larger pipe.

 

[Big Jordy]

As druid says a bigger pipe will give you no more pressure just more volume.. its all governed by the presssure of the main its being fed from.. resistance doesn't really come into it all.about the pressure in the main..

Jordan

 

[Big Jordy]

And i forgot 25 and 32 is pipe outer diameter..

 

[Antony Holmes]

Sorry lads to disappoint and a calculation i do not know how to do, but
if you start off with the same pressure at the start of a 63mm pipe and a 32mm pipe the pressure will be higher in the 63 mm at a given point due to less friction loss in the larger pipe the bigger the pipe the less the water is rubbing on the inside of the pipe.

 

[Big Jordy]

Cant really comment on figures about friction.. but id guess the difference isnt a big lot.. but i know that in 20 25 and 32mm pipe you lose 1 bar of pressure every 33ft or 10 meters in height... bigger pipe you get more volume but still the same pressure as the pressure is governed by the main your bringing your fed off..

Jordan

 

[fred]

Sorry lads to disappoint and a calculation i do not know how to do, but
if you start off with the same pressure at the start of a 63mm pipe and a 32mm pipe the pressure will be higher in the 63 mm at a given point due to less friction loss in the larger pipe the bigger the pipe the less the water is rubbing on the inside of the pipe.

this.

 

[Big Jordy]

Water mains are at a constant pressure to keep a good pressure to every feed of the main.. be that a domestic or commercial feed.. if you have a pressure complaint its tested at your outside tap or kitchen cold tap.. then its tested at the boundary box.. simples like a water main is at nearly always a constant pressure.. if its too high its put through a PRV and that regulates it.. too much pressure bang goes the main..

 

[Big Jordy]

Ill just add i work at this day in day out lol haha lol

 

[V8Druid]

Sorry lads to disappoint and a calculation i do not know how to do, but
if you start off with the same pressure at the start of a 63mm pipe and a 32mm pipe the pressure will be higher in the 63 mm at a given point due to less friction loss in the larger pipe the bigger the pipe the less the water is rubbing on the inside of the pipe.

sorry Anthony, but the pressure has sod all to do with friction ... you're talking flow rates.
The pressure will be uniform throughout the entire pipe .... assuming they are both on the level .... as Jordy says the pressure will diminish as it has to climb in altitude ... the lower the pressure the lower the flow rate .... granted there will be a miniscule loss due to friction and it would be calculable given the stiction rate of water passing over the MDPE or whatever surface ..... and the bigger the pipe, the greater the surface area, so there would be more stiction / friction generated ...... but indiscernible .... but the pressure would remain constant, on the level

 

[Antony Holmes]

sorry Anthony, but the pressure has sod all to do with friction ... you're talking flow rates.
The pressure will be uniform throughout the entire pipe .... assuming they are both on the level .... as Jordy says the pressure will diminish as it has to climb in altitude ... the lower the pressure the lower the flow rate .... granted there will be a miniscule loss due to friction and it would be calculable given the stiction rate of water passing over the MDPE or whatever surface ..... and the bigger the pipe, the greater the surface area, so there would be more stiction / friction generated ...... but indiscernible .... but the pressure would remain constant, on the level

i stand corrected

 

[Rob 210]

you need to get this baby in for a day

 

[Rob 210]

They where laying cables from a new wind farm.
Interesting little set up too.

 

[Rob 210]

This machine went infront and bound all the cables into one big bunch before the trencher,trenched and buried
Came right paast the site we where working on

 

[V8Druid]

This machine went infront and bound all the cables into one big bunch before the trencher,trenched and buried
Came right paast the site we where working on

some sort of spiral wrap that ..... would not want to paying for the cables .... let alone the job