Could someone please enlighten me why there can be two nominal weights for the same OD and wall thickness?
For example, this is what I found on Tenaris Website.
18 5/8" OD 0.500" Wall casing has nominal weight 99ppf and 100ppf (Screenshot in attachment)
We make a living by what we get; we...
Hi realtime2,
Thanks for your post. It's very helpful.
You also made a good point: acceptance from the customer. I foresee it's difficult to convince the customer. Do you know of any design code or specifications for such a problem?
We make a living by what we get; we make a life by what we give.
Sorry, my question is perhaps misleading.
The pipes are shipped by sea. That's when they are exposed to salt water (splashes, etc). It could last for months.
The 2 years I mentioned earlier is in fact sort of "shelf life". The are stacked in a yard, under the sun and rain.
The coating need to...
The product is machined from steel. There are some sharp corners, but no welding.
I'm giving a fictitious example to facilitate the discussion:
I use FEA and find out that:
The SCF of existing product is 3.
The SCF of new product (only changes in dimensions) is X, and the hot spot is in the...
Hi, can anyone advise how to generate an S-N curve of a component using FEA?
Our company designed a product some years back, tested it in a resonance fatigue testing machine and generated an S-N curve.
Now we created a few variations of that product (similar geometry but different in size)...
Hi, I'm looking for a coating for steel pipe that can last for at least 2 years in marine environment. Any recommendations?
We make a living by what we get; we make a life by what we give.
Hi,
I'm purchasing a magnetizing machine for company, and it has specs as follow:
3-phase, 380V, 50Hz
Current = 300A
Duty cycle = 30%
Taking into consideration of the duty cycle, how much power should be allocated for safe operation?
stanweld,
do you mean the UTS is to be specified by the buyer? So the alloy, for instance 4145H, from manufacturer A could be different from that from manufacturer B?
I'm wondering if any industrial/international Standard has specific requirement on UTS and other mechanical properties?
Can anyone please advise the difference between AISI 4340 and AISI 4145H?
I cannot find mechanical properties (yield strength, tensile strength and so on) of AISI 4145H.
Many thanks.
Anybody please advise if it is possible to upset a SS pipe?
If yes, is there any standard procedure? what are the things need to pay attention to, and it there a limit on upset dimension?
If not, what are the reasons?
Thank you in advance.
The casing string undergoes numerous rotations during drilling. Also consider wear by the cuttings. How would that compromise its mechanical performance?
Thank you everyone. I've learnt a lot from the discussion, still trying to appreciate the complication of matel fatigue.
Now I come across DNV-RP-C203 and BS 7608B "curves", what are these two standards all about, and any copies available on-line?
Ya it's similar for T95. API 5CT require Max hardness 25.4 HRC.
Let's make it simpler:
Now I have a casing/tubing material that complies to API 5CT L80, and its hardness is 22.5 HRC. Is it acceptable for all service temperatures based on NACE?
In the 2009 edition, in Table A.3 it shows L80 type 1 is acceptable for all temperatures.
Does that imply that L80 type 1 is accepted though hardness requirement differs slightly?
When talking about metal fatigue, we know that number of loading cycles to failure is related to stress. But the stress we talk about here refers to max. stress or stress range?
I'd expect both max stress and stress range affect the number of cycles. Yet in a typical S-N curve I see only the...
