The PSL2 pipe is manufactured with more limited controls, both in the raw material, process and the pipe itself.
It is intended to reduce the probability of premature degradation, resist the fracture propagation, HIC and the others well known damage mechanisms that could lead to fatal failures...
Thanks Littleinch.
I'm not looking for an specific improvement. But it has been the same for a long time.
I was reviewing the standards: NACE RP 0286 becomes SP0286 in 2007 and it has been all about it.
As you say: If it isn't broken why fix it?
Hi everybody
I'm looking for the art's state about Pipeline isolating devices.
I see the typical and well known Monoblock joints and/or flanged joints, but someone knows about some improvement in this technical or any better or newer device to isolating catodically protected pipelines?
Thanks...
if you are using CVN test, the lenght also is important, since duration of test could be shorter if the test piece is shorter too, hence the energy could be lower than real. At the opposite side, if the test specimen is larger, more friction over the anvil, more energy to fracture
To my mind: The shiny silver region that you mentioned is a mechanical damage post fracture, however welds are fatigue susceptible too and don't have fatigue limit (10^6) as the base metal, and more discontinuities are possible.
It is correct, it corresponds to ratchet marks (fatigue), which can be generated even by the roughness of the surface, without the presence of a "significant" defect. I can´t detect the weld in your photos.
In the first photo there is an area between 11:30HT and 2:30HT that looks different...
Answer 1: Yes. The pattern of circumferential lines along the fracture surface is a pattern of beach marks that extends outward. River lines indicate propagation from the internal diameter.
The beach marks seen in the detailed pictures may correspond to secondary starting points.
Answer 2. Yes...
The text says: Ammonia gas dissolves well in water giving rise to alkaline solution. Ammonia gas and its solutions are corrosion inhibitors of carbon steels.
In some cases, the humidity are used to inhibite the anhydrous ammonia (1 - 2%), ex. during its rasnportation.
Did you verify that the filters are the same, type, material and mesh or number?
The capacity and efficiency of the pumps is also a crucial factor, is the same or proportional?
Not exactly as you ask but maybe be more than 50 mil/yr, since each acid without mix have this value (and just i have for class of steel, not for specific one.
Check the Matweb’s page http://www.matweb.com
When you search for a material, multiples options appears and there is descriptions and a list for standards and denominations related to the same material, and of course, there is properties and technical information about.
