Hi, hope all is well.
I am interested to know why the grade number sometime refers to yield strength; but sometime tensile strength.
Such as ASTM A516 Gr70, its TS is 70ksi and YS is only min 38ksi. On the other hand, ASTM A572 Gr65 means the min YS is 65ksi. I have to say, from where I have...
From a offshore installation and maintenance stand points, what is recommended distance between umbilical and flowline/pipeline in subsea production system? Thank you.
Sompe production profile I have seen, say:
oil flow rate: 100,000 bopd
water flow rate: 50,000 bopd
Total fluid flow rate: 140,000 bopd
Why the total fluid flow rate is less than the sum of oil and water? Water injection is excluded here. Thanks.
All,
I understand and am quite familiar with stress linearization and categorization with linear-elastic analysis. Only did couple nonlinear/EP analysises before. I like stress linearization as it allows me to interpret linear FEA results in a reasonable way.
I am wondering what is the...
I am looking to talk to some small or medium sized LWD/MWD companies,rather than big ones like Schlumberger or Weatherford. Any recommendation or contact will be appreciated. Prefer TX or LA subsidiaries if possible.
I am in process of writing subsea valve Spec with welding ends for manifold fabrication. So there probably are two contractors involved: valve manufacturer and manifold fabricator. Then how should I specify the FAT test in the valve Spec (no blind flange can be used for testing given the welding...
I am trying to reproduce or verify the capacity chart in 6AF2, especially by leakage criteria. I verified couple sizes and several load cases for each size. The result I got was lower than 6AF2. Wondering if anyone did the same thing before?
The leakage criteria in 6AF2 is:
1) fix the outer...
I am trying to reproduce or verify the capacity chart in 6AF2, especially by leakage criteria. I verified couple sizes and several load cases for each size. The result I got was lower than 6AF2. Wondering if anyone did the same thing before?
The leakage criteria in 6AF2 is:
1) fix the outer...
Is it common to require NDE, surface and vometric, for structural steel, say astm a36, a992, a572, etc?
I personally think it is a good idea to have them, but don't know if it is too much. Thanks a lot.
We need to refurbish some API flanges per API 17D. This standard states all flange ring grooves shall be inconel 625 inlayed for subsea application. But I didn't find anywhere specifying thickness of inconel inlay. Does it specify thickness at all? NORSOK M506 mentioned CRA overlay shall be 3mm...
Hi Everyone,
I need to find some 2'' subsea gate valves, preferally manufacturers in US. Specifically:
- 2-1/16'' API 6A flange connections
- Subsea application, hydraulically actuated or ROV interface
- 10ksi internal, 5ksi external pressures
- Meant to be H2S sour service
Any pointers shall...
Hi experts, Our products are to NACE MR0175 standard and certification authority will need/witness hardness verification. When should we do the post manufacturing hardness verification? Before or after coating? Say we have a part made of QT 4140 and with QPQ as coating. We have everything...
We have or have tried three options as below:
1) 8630 Modified to higher alloy addition
2) 4340 or 4330V is unacceptable because of NACE 0175
3) just began to consider F22/F22V, not sure availablility yet.
Therefore, we only have one option which is 8630MOD right now, and it is great except...
Per ASTM A370 8.4, it says "Unless otherwise specified, it
shall be permissible to age tension test specimens". What is the purpose of this specimen aging possibly?
Hi Experts,
We are planning to EB weld the following combinations:
1) 4140 and 718
2) K500 and 718
3) K500 and MP35N
The first material is a cylinder piston and 2nd material is a pin to be welded into a tight fit hole in the piston. Hole is perpendicular to piston axis. Penetration depth is...
Experts: we buy large diameter nickel based alloys and we really prefer material in tube format, but you know often times we end up with getting bar stocks. What is the best way to get the core portion out and save it for small parts?
Experts, wondering why NACE0175 has a nickel limit as 1.0% on carbon or low alloy carbon steel?
For example, 4340 and 4330V are are excellent through hardening material for large diameter stuff. But they are out given the 1.0% limit on Nickel.
Thanks a lot for your any inputs in advance.
Can anyone tell me what is the difference between TC and QTC in API 6A? They seem awfully similar to me. Basically PSL 1 requires usage of TC and PSL 2-4 requires QTC. Your any comments are highly appreciated.
Experts,
I have two basic questions:
1) what chemistry is susceptible to galling? I know maintaining hardness differential is good, reduce contact stress, lubrication, etc. But other than those what chemical element makes the metal volnerable to galling? I got a feeling it is Cr. If it is...
Experts,
Got a real problem, can't figure out what are the governing equations to solve, which is different from school :D
I have an umbilical or hose running from sea surface down to 10,000ft deep. The hose is used as a hydraulic control line for subsea equipment. The top end of hose is...
