It is well known that buried pipelines get an insulating effect from adjacent soil mass.
Can anyone cite references where the temperature of the soil just below seabed
has been measured and reported? This could also have been used in the analysis
of temperature gradient of the fluid in the...
Here normally 1.5mm bars @ 50 mm spacing are used as a mesh
for reinforcement. This is bare steel and works out to nearly
20 % of the steel surface area! Not considered by anyone.
M. Hariharan
Naren.
Thanks a lot for the info. I am trying to gather info against an
Exxonmobil type of situation! Could you refer me to some
Oil company specs which may be available on the net, which
specify Cl. 6.5.3
I did raise the point of current drainage due to reinforcement
with my colleagues. Their...
Roscoe,
Thanks. When did you execute this project? DNV RP B401 (1993) has
a definite breakdown factor for FBE coating without any overwrap
and for FBE with adhesive and polypropylene type overlays. There is
none for FBE + concrete coating. There is however, a category called
'any equivalent...
I am looking for the basis for determining the coating breakdown factor
for a submarine pipeline coated with about 500 microns of Fusion
bonded epoxy and having a concrete weight coating of 1-3 inches.
This type of system, I understand, is common in GOM. The coating
breakdown factor is...
I am looking for the basis for determining the coating breakdown factor for a submarine pipeline coated with about 500 microns of Fusion bonded epoxy and
having a concrete weight coating of 1-3 inches. This type of system, I understand,
is common in GOM. The coating breakdown factor is required...
My company designes a lot of tanks for the petroleum
industry. I have not been directly involved, but have a number
of colleagues who are.
40,000 barrel is about 6000 m^3, which, incidentally, is at
the smaller end of tank sizes! (IJR). The largest tanks are in
the >70000 m^3 range. (80 m...
If there is a cladding 18' deep, it certainly will provide a lot of
shielding to a similar cladding 20' on the leeward side. You
should consider a shape coefficient of 1.5 for the windward
cladding. The shielding coefficient for your case should be
available in some codes. (I know Indian...
The basic question asked by Jasonlee seems to have been
missed out. I am also interested in this topic albeit for a
slightly different reason. What is the consideration required for
proper bond between old concrete (precast) and new concrete
(in-situ)? We recently designed a jetty with grid...
IJR,
Further deliberations:
1. Piles should be mandatorily attached rigidly to the slab.
i.e. the connection should be a moment connection. I am not
very comfortable with pin connections in concrete!
The point I had made was that if the top soil is quite weak, it
does not offer much lateral...
IJR,
This should be an interesting project!
1. Being in Zone 4, I expect you will have shear walls to resist
lateral loading, so as not to stress the columns in bending.
This would put rigidity into the superstructure whose
natural period would be quite low, and the response spectrum
ordinate...
Depends on what structure it is, and what is the sensitivity of
the results to foundation behaviour. What is the structure you
have in mind? What analysis are you planning to perform?
Static, dynamic, seismic ?
Hariharan
FSS,
Your question is perfectly valid. An individual element, when
stressed to the limits, will behave differently (inelastic, plastic,
in contrast to elastic behaviour assumed in analysis). The
structural system will not fail until the structure is unable to
carry any additional load, i.e...
You should define 'Marine environment'. Is it for components
above water, but in a salt laden atmosphere, or is it for
components which are subject to alternate wetting and drying,
like tidal/splash zone, or for components permanently
submerged in water?
I would be skeptical about using epoxy...
Rod,
The largest single crane lift we have had in India was about
2100 tonnes, and double crane lift was about 4500 tonnes.
At other locations, with some other barges, higher lifts
would have been executed. I don't have the details.
There are a few floating crane barges with twin
cranes. The...
Mayur,
We are used to REALLY Heavy lifts in the offshore industry,
and 200 tons is very small by our standards. Here are a few
suggestions.
1. Check adequacy of crane(s), clearances for lifting i.e., no
obstructions during lifting and shifting.
2. We normally do not accept more than four-point...
IJR,
We have not considered thermal stresses for offshore
structures here in India, primarily because the structures are
shielded from direct solar radiation, and the variation in
ambient temperature is rather small. Exposed truss structures
such as bridges are generally "statically...
IJR,
I am in this forum as well!
Probably the main reason why people don't bother about
thermal effects in trusses is that most trusses are statically
determinate, or the level of indeterminacy may be very low.
When all members in a statically determinate structure are
subjected to the same...
In India, where the summer temperature can go over 100F, we
take that exposed steel can reach 60C = 140F. May be
you can reach 120F? Only a guess, no clue.
You must be having a sheeting over the truss. Then the
temperature would not go much beyond the temp. in shade.
If it is during...
IJR,
If heavy brace is welded to a heavy chord, the joint is a rigid
joint. There would be moments in the members. Conceptually
such moments should not be ignored. If the
external loading is only at the joints, these moments could be
small. If you are performing a computer analysis, it is...
