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  • Users: rustbuster
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  1. rustbuster

    MTR Certification Requirements

    I have recieved some suspect 304H pipe from an Asian mill. The MTR's are not signed or stamped. Is this a requirement? I don't recall ever seeing MTR's without a signature.
  2. rustbuster

    Duplex vs Admiralty Brass

    Hello all, I'm lookin for some quick comparison numbers for 2205 to compare to SB 111. I want to know how much heat transfer I will give up if re-tube insitu. Thanks all.
  3. rustbuster

    Furnace Convection Section Remaining life analysis

    I have been tasked with estimating remaining life of some furnace convection sections. I am hoping some of you folks may have done similar and can offer some ideas. things that come to mind initially are; • What types of inspection data we need • Historical failures • Damage mechanisms •...
  4. rustbuster

    Purge Gas GTAW penetration question

    We had a lot of difficulty with our final tie-in welds with concave root and some cracking with Inco 117 filler on 304H and a needle purge on a project. We are attempting to weld up some test pieces of 800H with 117 (Needle purge) in our shop and discovered that this too resulted in significant...
  5. rustbuster

    Robotic Pipe Crawler

    I am looking for a company that has the capabilty to internally inspect 6" diameter pipe and can navigate 180 degree 1 D bends. Anyone know of a resource?
  6. rustbuster

    PWHT Stainless Steel - Essential Varialble?

    I am looking at doing PWHT (solution annealing) on 304H material to reverse the sensitized HAZ. Looking at QW-407 of AMSE Sec. IX I am interpreting that PWHT is not an essential variable for weld procedure and that an additional PQR is not required. Is this interpretation correct?
  7. rustbuster

    Experience with Alloy 803

    Has anyone had experience with Incoloy 803? I am looking for case histories or experience in High Temp 650C-750C carbonaceous gas environment. (Pyrolosis Furnace) Particularly with post-service repairs / modifications on this material in the aged condition. The alloy looks to be suitable for...
  8. rustbuster

    Chrome Depletion 304H welds

    Hello all, I have evidence of chromium depletion in 304H butt welds from metallurgical analysis. The depletion appears to be the result of high heat input / slow cooling. I want to develop a presentation for our trades people and wondering if there are any "canned" materials out there similar...
  9. rustbuster

    Heat Treatment A335 P91 Assistance

    I have some in service steam piping, 9Cr 1Mo V Grade P91 with soft spots. Hardness values ~160 BHN. I am wondering if re Normalizing and Tempering will restore the strength of this material with any success. (Awaiting field insitu replicas as well). If this is an option, does anyone have ideas...
  10. rustbuster

    Piping design - rule of thumb

    I am looking for a "rule of thumb" idea or even documentation related to maximum flow velocities for process piping. I recall from the past hearing 50ft/s generically but not sure if it was for process piping, pipelines, or both. My specific need is for a gas phase but a generic table would be...
  11. rustbuster

    Cutting 410 Stainless

    Can 410 Stainless be flame cut? I can't recall. Appreciate your help.
  12. rustbuster

    Sulfreen Condenser Problems

    Hi all, I have a Sulfreen Condenser that has failed after 10 months service. Failures are in the seal welds of the inlet tube to tube sheet welds. 660 psig BFW shell side, tail gas tube side with very little evidence of corrosion. The gas side sees temperature cycles of 300of to 600of every 15...
  13. rustbuster

    316L Reboiler Tube Temperature Discoloration

    Hello all, I have some 316L reboiler tubes suffering preferential attack at the baffle locations in an MEA solution. There is also a distinct dis-coloration that appears to be a temperature gradiant in these locations (blue - grey0. Does anyone have an idea of what temperature range this may...
  14. rustbuster

    Test specimen for preferential weld attack

    Hello all, I am seeking a metallurical lab / company in the Houston area who could assist me with the following. I need to preferentially corrode a mock up A516-70 welded specimen in the weld zone to given depths. (Mechanical means not acceptable)The piece will be 0.75" thick and I would...

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