cckla,
I doubt it very much. I have never found a useful free standard on the
web. The majority of those organisations are now private organisations
bent on making a profit, so you can expect to pay. It looks as though you
are designing a fire water system. I suggest you surf the national fire
protection association (nfpa) website and look at the short descriptions
they give for each standard and take a punt on the ones that may cover the
subject of buried line. Once you know what you are looking for see if you
cant loan a copy from your national library or technical institution. I
did a quick google search and found the following site which you could
start with.
http://www.nfpa.org/catalog/home/index.asp?cookie%5Ftest=1
Cheers,
Gordon Reddek
Gordon Reddek
Specialist Mechanical Engineer
Alcan Engineering, Level 3, 443 Queen St, Brisbane, Qld 4001, Australia.
Tel: +61 7 3328 6424
Fax: +61 7 3328 6990
Email: gordon.reddek@alcan.com
"cckla" <cckla@pd.jaring.my>
03/06/2004 06:24 PM
Please respond to
PipingDesign@yahoogroups.com
To
<PipingDesign@yahoogroups.com>
cc
Subject
Re: [PipingDesign] Underground Piping
Dear Mr. Gordon Reddek,
Thank you for your informations. Anyway, is there any international piping codes which are available online, such as nfpa for fire services ?
Regards,
cckla
Dear Thanks,
The criteria for buried pipe depends on the code that has jurisdiction over the facility you are designing. These days one seldom designs a pipeline from first principles, you have to design to the requirements of
either a national, or international standard. As always you guys give insufficient information to give good advice. What are we talking about
here. High pressure steel oil or gas line, plastic or a concrete sewer?
What is the diameter? two inches or six feet? For what it is worth:
are normally buried with 1200mm cover, that means from the top of the pipe
to the road surface.
2) If the road is to be subject to abnormal traffic, like trucks
carrying
heavy equipment, one normally buries the pipe deeper, or , the pipe runs
in a culvert designed by civil engineers to take the load, or a slab is cast over the pipe to distribute the load to the ground on both sides of
the pipe.
3) Very large diameter low pressure lines like sewers require special
treatment. That is the area of a specialist and you should not touch it
if you are not qualified.
Regarding bedding material. The soil below the pipe is commonly called bedding and that above the line is called shading. Normally it has to surround the pipe with a layer of at least six inches (or 150mm). The specification normally calls for clean loose sand free of stones and extraneous material. Some specs may even nominate a sieve size that the
sand must pass through however it is not uncommon to see clauses like "the
sand may contain stones of a rounded shape and with a diameter no greater
than (say) 10mm." The details will depend on the pipe coating. If the pipe is a steel pipe coated with a fairly soft coating the spec will have
to be stringent to protect the coating from damage by the bedding and shading material. If the pipe is a concrete monster you would most probably call for a loose sand bedding so that the pipe can be levelled properly and shading with the excavated material provided the lump size
is on average no greater than (say) 100mm. What you specify depends on the pipe you are installing.
Sure you can join pipe under roads. If you are running gas or some other
dangerous material you will not want a leak there so one tends to be more
stringent regarding joints in that area. Some Authorities may require that the line under a road is jointless, however in general pipe codes require the pipe in that sort of area to be thicker so that they are more
lightly stressed. Flanges are generally not allowed on buried installations so I would expect that a full penetration butt weld which is
subject to 100% NDT would be considered to be acceptable.
Once again, you must find out what code governs the way you design your line and you must be guided by the requirements of that code.
Gordon Reddek
Specialist Mechanical Engineer
Alcan Engineering, Level 3, 443 Queen St, Brisbane, Qld 4001, Australia.
Tel: +61 7 3328 6424
Fax: +61 7 3328 6990
Email: gordon.reddek@alcan.com
"cckla" <cckla@pd.jaring.my>
02/06/2004 03:40 PM
Please respond to
PipingDesign@yahoogroups.com
To
<PipingDesign@yahoogroups.com>
cc
Subject
[PipingDesign] Underground Piping
Dear All Specialists,
Thanks
[Non-text portions of this message have been removed]
Yahoo! Groups Links
Notice:
This message and any attachments are the property of Alcan and are
intended solely for the named recipients or entity to whom this message
is
addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
------------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/PipingDesign/
b.. To unsubscribe from this group, send an email to:
PipingDesign-unsubscribe@yahoogroups.com
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.
[Non-text portions of this message have been removed]
Yahoo! Groups Links
Notice:
This message and any attachments are the property of Alcan and are
intended solely for the named recipients or entity to whom this message is
addressed. If you have received this message in error please inform the
sender via e-mail and destroy the message. If you are not the intended
recipient you are not allowed to use, copy or disclose the contents or
attachments in whole or in part.
[Non-text portions of this message have been removed] Received on Thu Jun 03 21:39:00 2004
This archive was generated by hypermail 2.1.8 : Mon Oct 27 2008 - 20:24:04 EDT