@Gr8blu: Yes, in sort the options are as you summarized. It is impractical to machine entire surface and do a weld buildup. We are however already planning to coat entire surface with high temp. coating to control pits.
Is there a clause in NBIC which mandates repair of all pits? Can we not...
We have a sour water stripper column 9mm thick on very top section and 18mm for the remaining section. The design corrosion allowance (CA) is 3mm.
Pits are mainly found on the 18mm thick section.
-Pits with depth about 1mm or less are spread across the shell for which plan is to use metal...
How can i check whether a tank is designed with release prevention barrier as per April 650 appendix I?
It has not been indicated specifically in any of the docs.
Nickypaliwal
Materials & Corrosion Engineer
Thanks for your expert opinions.
Can you also confirm as which thickness do we generally look at while deciding for impact test?
Although I have gone through the UCS66 and Fig UCS66.3 earlier also but am not clear as which thickness are they referring to?
Is governing thickness based on the...
Refer case as below for pressure vessel (design code is Sec VIII Div I - Section UCS-66):
- Required thickness of vessel - 9.5 mm
- Vendor offered A106 GrB SCH80 for shell so nominal thickness is 10.97mm
-Minimum Design Temperature - minus 29degC (-20degF)
As per the curve, A106 should fall...
There are many options as Bronze, SDSS, Nickel Resist however the most economical would be plastic.
But plastic usage shall be limited incase of high temperature and pressure. The pump in the photograph looks to be a small size and not a high power pump.
Nickypaliwal
Materials & Corrosion...
Sorry Gents, I am trying to collect more information but due to some reasons in office , the link is broken.
Nickypaliwal
Materials & Corrosion Engineer
Appreciate your response. Please see below details, I will try to answer all the questions as there are too many.
Piping that we plan to use is - A106 GrB.
Location is Oman. The length of pipe required is 24m and 12m for 20" and 18" respectively.
The service is hydrocarbon and the area is...
we have a requirement for 18" and 20" ISO 3183 Gr L415, PSL2 (SMLS/LSAW/HFW) however the required length is very small so we want to use B31.3 material.
What major concerns related to material and material testing should be taken care other than mechanical testing requirements (tensile...
@brimmer We recommended the same and still it needs to be done.
@Steve We also considered edge defect as a probable cause however the defect is at a limited locations and we can not do anything to confirm it now. Now we are just looking forward to track the defect locations and to decide...
There is not much to add up till now but there are 4-5 locations/leaks expected in a pipe more than 250KM long. At present, it is not suspected to be spread all over however more details are yet to come. I will keep updating with the information.
@ Steve Thanks for the links. First link one of the same link that I reviewed. Based on the available information, I feel the penetrator defect may be the most probable reason. The second link above is new and I will try to investigate more for the relevant information.
@brimmer: We plan to...
There is a 18" 10.3mm thick API 5L X65 HFW pipeline which passed all the tests including hydro test in mill however there is a pin hole leak observed near the seam weld which was observed in field hydrotest.
It was difficult to find the location of the leak as the leak is small and was not even...
Is there any difference between non-invasive and non-intrusive inspection?
If yes, then please provide an example or explanation of such a case.
As I understand, the meaning of both are same however the context in which they are used is a little different.
Non-intrusive is use to categorize...
To update, nothing has been finalized for forward action and we have regretted the project as we don't specialize in it.
Still I will try to gather information and share with you, if I get any.
Thanks for your comments..
It is above ground is desert region for in airport vicinity.
The fasteners are non-wetted and for civil purpose in Gulf region.
For petroleum industry, generally CS or Coates CS is acceptable however as understood from auditor comments, there are separate standards...
Both HDPE and PVC pipes should be fine for water service however HDPE and PVC both have limited resistance against sunlight/UV exposure so trust you already have a shed or some sort of protection.
U-PVC would be the preferred option if the water is supposed to be used for living beings else...
What is the recommended material for the jet fuel piping and fasteners in airport supplies?
We have applied upstream standards and have proceeded with Stainless Steel piping and Low Alloy Steel bolts/nuts.
Is there any standard that calls for SS bolts/nuts?
