Thanks Geoff
The products look $$$.
I normally design the simple hangers and struts myself and shop around for
the fancy bits.
I need a (river) water pump 105l/s at 210m (option 130m) for booster service, in a hurry. Apart form TKL who in Oz should I talk to?
Cheers
Steve McKenzie
-----Original Message-----
From: Geoff Stone DD&D Australia [mailto:blenrayaust@yahoo.co.uk]
Sent: Wednesday, September 24, 2003 4:36 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Struts
Hi Steve,
A good reference is the software that can be downloaded from www.lisega.de if you cant get hold of the lisega manual.
Geoff
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:
Yes they are struts and as such are designed for compressive loads.
For tension loads you do not need a strut; a hanger is sufficient.
Hangers
do not all have springs. Hangers with springs are normally called,
strangely
enough, spring hangers. Some hangers are nothing more than threaded
rod.
Have a look at "Piping Guide" fig 2.72A if you want to see the various
types
of hanger.
They even give a table for load reduction ratings at various
slenderness
ratios (lengths). There is a photograph showing two struts, in
compression
supporting, a pipe and the installation section shows a number of
proposed
configurations both in compression and tension.
Remember a strut is primarily for compression loading. Most struts will
work
equally well as hangers (tension) but cost more.
Cheers
Steve McKenzie
-----Original Message-----
From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com]
Sent: Wednesday, September 24, 2003 3:40 PM
To: piping design
Subject: RE: [PipingDesign] Struts
No, no. Not the hanger actually. Hanger has spring inbetween and not
the
rigid body and used to take only verical loads. Its also not same as
hanger
rod. Struts can be used even as guide or axial stops. For better
understanding you may refer some catelog of pipe support manufacturer
or may
visit www.lisega.com
Aha
I think its just words. What you call a strut I call a hanger. Every book I
have including the dreaded "piping guide" refers to struts as being
primarily compression loaded.
If you call a tension member a strut, there will be a lot of confusion.
A member designed for tensile load can be also loaded in compression but the
capacity is normally much lower.
It would be dangerous to assume that a member rated for a tensile load can
carry the same load in compression. With ductile members that have a high
moment of inertia compared to their length (short and fat) then the
difference may be small. However if long and thin, as many pipe hangers are,
then buckling may occur.
You need to work it out i.e. do the sums.
Cheers
Steve McKenzie
-----Original Message-----
From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com]
Sent: Wednesday, September 24, 2003 1:03 AM
To: piping design
Subject: RE: [PipingDesign] Struts
Hi Steve,
I am bit confused and I think I am misunderstood. My query is about strut
support and not Column/strut (structural members). The strut support
consists of rigid body with ball bushing joint as a connection at both the
ends. One end is connected with pipe with clamp and other with the
structure. Normally Struts have very high load bearing capacity.
Hi Tushar Rajyaguru
A strut is by normal definition a compression member. Same as a column. If
you have only used tension members, there is a bit more work involved in
strut design. You need to consider end conditions and analyse for buckling.
Also struts do not like eccentric loads, so avoid where you can. They are
fairly well covered in most textbooks although the end conditions/degree of
fixity when is used to estimate the equivalent length can take some time.
Transverse loads also need to be taken into account e.g. seismics, wind etc.
They can have a big influence as they induce a moment the same as an
eccentric load does.
Cheers
Steve McKenzie
-----Original Message-----
From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com]
Sent: Wednesday, September 24, 2003 12:14 AM
To: piping design
Subject: [PipingDesign] Struts
Dear Friends,
We are planning to use strut in one piping system. My query is whether strut
can take compressive load ? Generally we have used it in tension only.
"NO EFFORT IN LIFE GOES UNPAID, HENCE GO AHEAD"
Tushar K. Rajyaguru
Plant & Piping Engineering,
Larsen & Toubro - Chiyoda Ltd.,
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