Which are the main parameter to decide the straight length of a pipeline at the starting point, before any bend? How to determine the minimum feasible length? As far as I know this length is connected to the friction of soil and should be at least one catenary length. Any help will be appreciated...
Hi guys,
Regarding free span analysis according DNV RP F105 I've the following question:
Is there a minimum gap ratio (free span clearance/External Pipeline Diameter) that lead to VIV onset (i.e. below that limit no VIV occurs)?
I found in a document that with gaps ratio below 0.3 no VIV...
Hi,
I'm involved in on bottom stability study of a offshore pipeline. Due to extreme enviromental loads we are thinking about use of mattresses to ensure the stability during design life.
Since the DNV codes (RP 305 and RP F109) don't consider this situation, do you have any reference or...
Hi,
My Company has bougth an Offpipe (http://www.offpipe.com/) license and I found that it use a DOS interface. Anyone knows a software that can interface with Offpipe to avoid to use the Dos interface?
Thanks
Hi,
I'm collecting input data for a Detail offshore pipeline project.
Regarding the soil liquefaction analysis due to seismic hazard I'm collecting data regarding Peak Ground Acceleration assosiaceted with return period of 200, 500 and 1000 years.
My question is which is return period to be...
Hi,
my question is about pipeline coatings. In particular I would know if it is possible to put concrete coatings above thermal insulation coatings.
The main pipeline data are:
Pipeline 8"
Insulation Thickness 40 mm
Concrete coating thickness 40 mm
Thank you.
Hi Guys,
I'm involved in a deep water project (1400 m WD), and I'm writing a functional specification for installation of rigid pipeline. My question is what are the most suitable methods for buckle detection in such deep water (either in j-lay and reeled pipeline)? Of course the gauging plate...
Dearl all,
I'm writing a specification for the purchase of unbounded flexible riser (about OD 16", ID 8" in a water depth of 1400m).
I'm thinking about the protection from dropped object, how can I fix the requirements in terms of Impact Energy and Object Diameter?
The only reference I found...
Dear all,
I have to prepare a material take off for line pipe to be used offshore.
My question is regarding spare quantities: is there any standard, guidelines or recomended practice I could use to estimates occurency of wet buckle, spare for welding qualifications, damage due to pipe...
Dear all,
I'm writing a SoW for a FEED Design of a pipeline system and I'm listing the standards to be used for design.
My question is about 5D induction bends:
Is there any standard that covers this item (for example in terms of desing, material, construction and testing)?
In particular I'm...
Dear all,
I'm designing a 32'' gas pipeline and according specification of my client I've to choose wall thickness according API5L 2004.
The problem is that wall thickness I've calculated (39.1mm) is above the maximum wall thickness reported on standard (31.8).
As far as you know, is it...
Dear all,
I'm involved into design of pipeline system composed by 2 gas pipeline.
I have a small on shore section (500m) and I'm thinking about the possibility to bury both pipeline in the same trench (the route in that section is the same).
Considering that the cathodic protection system is...
Hi,
I'm working on a design of a offshore pipeline, my question is about shore approach zone.
According your experience, is it necessary to foresee a block valve (or ESDV) in order to separate offshore pipeline from onshore one?
The onshore part of my pipeline is very short (about 300m), the...
