Hi RIJOANTONY,
ASTM A694 F65 can be used for 1500 rating. In Oil and Gas pipelines (onshore and offshore) this material is widely used even if not specified in B16.5.
Manufacturers are familiar with this material/rating.
For P/T requirements you can refer to ASME B16.5 Group 1.1 as a...
alanisphoenix,
i think you are referring to line pipe hydrotest at pipe mill. In my experience the alternative formula given by API 5L has been used, without considering the limitations of Table 26. But pressures were lower than yours.
31.75mm of WT in any case means very high desing...
DNV OS-F101 is an offshore standard, but gives criterium that is valid for all application, i think:
Sect. 13 E300:
"Calculation of nominal thickness
T=(T1+Tcorr)/(1-%Tfab)
T1=pressure design thickness
Tcorr=corrosion allowance
%Tfab=thickness tolerance "
That corresponds to method 1.
Two articles i have in my files.
They cuold be useful.http://files.engineering.com/getfile.aspx?folder=0d3d5f8b-aa57-49c5-a9ee-2b867c5ac2f0&file=ep_tp_44_02en[1].pdf
Widely used for risers!!!
Ok. You confirm my doubts.
Moreover I did not have any reference with this system from consultant after my request.
In conclusion, i think to stay in my position: >20 mm of polychloroprene.
Thanx all.
In fact i have doubts on this solution: 2mm of solid polyurethane tar free.
This is the solution proposed to me by our consultant.
Design life is 30 years.
I'm not an expert on coating material but it sounds me not reliable.
I'm pushing for a 20 mm of polychloroprene that is the solution i...
Sorry,
i was not clear.
2mm shall give protection against corrosion of steel and shall prevent mechanical damages to the coating:
the riser during its life shall not show parts where the steel is exposed. This condition, i think, is necessary in the splash zone.
Thanks for support.
Hi,
I have to protect a 16" riser.
In my experience i encountered risers coated with 20-40 mm of Neoprene or polyurethane mixture.
Are there other solutions that give the same performances?
In particular could 2mm of solid thermosetting resin (polyurethane) give the required protection against...
OK,
In case the application is a system with polyurethane only (solvent-free thermosetting resin, applied by airless spray)is it possible to reach a thickness of 5 mm?
Some product data sheets give a max thickness of 3 mm.
OK BigInch.
But I have some doubt about the thickness of coating (5 mm).
Data sheet of materials that I encountered in the past gave a maximum thk of 3 mm.
Thx for support!
Hi,
I have to select an anticorrosion coating for the bends of a 16" offshore pipeline with a design temperature of 35°C. Ambient temperature is 15°C. Design life 50 years.
Designer propose a polyurethane coating system (airlees spray applied) with 5 mm of thickness.
Wath is the best choice...
Hi,
I have to select an anticorrosion coating for the bends of a 16" offshore pipeline with a design temperature of 35°C. Ambient temperature is 15°C. Design life 50 years.
Designer propose a polyurethane coating system (airlees spray applied) with 5 mm of thickness.
Wath is the best choice...
In this case i had two type of clamps in splash zone:
1 with brace welded on the platform leg and
1 clamped on platform leg with neoprene as internal protection coating.
The client considered this section of riser not cathodically protected and suggested a corrosion allowance of 5 mm to be...
