Hi manjuantha,
I have been following you postings to the group and wish to add to Steve's comments.
If you approach the suppliers of the piping product that you are using there is a strong chance that if you ask politely that they will allow you to view, copy or even provide you with a pipeline text book that will answer your queries and provide you with a greater understanding as to the tasks that you wish to perform. I have several such pipe manufactures publications and find them very useful and a reasonable reference to most activities related to system design, installation and piping physical characteristics.
Cheers,
Robin
> Hi manjuantha k
>
> I sometimes design the fill for trenches. With plastic pipes, a fill
> design is essential especially if the most economic pipe wall thickness
> is to be used and especially partial vacuums are to be experienced under
> transient conditions. Sometimes it is necessary with thinner wall steel
> pipes as well. There have been a number of theories developed for the
> fill design; don't take my word for it; just look in any number of books
> and you will find a number of articles on the internet.
> Part of the objective of fill design and compaction is to fully support
> the pipe around its entire perimeter. This makes it much harder to
> squash (buckle) the pipe due to traffic/occasional loads and vacuum
> conditions. Failure by buckling is nearly always of much greater concern
> than straight compressive failure. The purpose of the sand is to protect
> the pipe surface and to increase the effective soil modulus, also
> sometimes to assist in containing thermal expansion.
>
> I suggest you do some further reading before making further general
> claims.
>
> Cheers
>
> Steve
>
>
>
> -----Original Message-----
> From: manjunatha kh [mailto:sagarmanjunath@yahoo.co.in]
> Sent: Tuesday, August 10, 2004 9:06 PM
> To: PipingDesign@yahoogroups.com
> Subject: RE: [PipingDesign] Buried pipe Trench
>
>
> pipe trenches are filled with sand and loose earth and normally
> compaction is not done/required.
> if there is any vehicular movement across the pipe trench then a
> different method is used. i.e. main pipe is protected with a sleeve pipe
> one size higher than the main pipe. also please note while using digger
> buckets/ shovels may damage the pipe, the coating/ wrapping / cathodic
> protection if applied.
> this 250 mm is enough if the location is totally new & single and no
> other piping is existing.
> how the compaction is going to help. it only increases the cost and
> extra stress on the pipe.
> please clarify.
> Steve McKenzie <mechproj@xtra.co.nz> wrote:
> you need some clearance at each side to compact the bedding material. In
> smaller sizes, width is determined by other factors such as
> shovel/digger bucket width joint making and compaction access.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: manjunatha kh [mailto:sagarmanjunath@yahoo.co.in]
> Sent: Tuesday, August 10, 2004 7:16 PM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] Buried pipe Trench
>
>
> the good engineering practice for trench width is the diameter of the
> pipe + clearence of 3" on either side of the pipe ( at one meter depth).
>
>
> cckla <cckla@pd.jaring.my> wrote:Mr. Manjunatha kh,
>
> Can I konw how you determine this (250mm) ?
>
> Regards,
> cckla
> ----- Original Message -----
> From: manjunatha kh
> To: PipingDesign@yahoogroups.com
> Sent: Saturday, August 07, 2004 1:32 PM
> Subject: Re: [PipingDesign] Buried pipe Trench
>
>
> 250mm
>
> cckla <cckla@pd.jaring.my> wrote:Dear all specialists,
>
> Do you know the minimum width of the trench for a 100mm diameter pipe,
> which will be considered as embankment backfill ? Is there any standard
> formula to determine the trench width for embankment backfill for the
> various pipe size ? Please guide me.
>
> Thank you.
>
> Regards,
> cckla
>
>
> [Non-text portions of this message have been removed]
>
>
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Received on Tue Aug 10 21:55:00 2004
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