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  • Users: DBreyer
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  1. DBreyer

    Severe Bowing and sagging of Heater Tubes

    Hi all, upon entering a an atmospheric crude distillation fired heater in a turnaround we are faced with severely deformed heater tubes. Most likely due to coke buildup and associated high tube metal temperatures during a 1 year time span in the previous run (we did a pig clean during the run...
  2. DBreyer

    Secondary containment seismic performance

    Hi All, We have to revisit the seismic design of some older flat bottom tanks. Initial assessment is that the tanks themselves won’t be able to resist the seismic loads. They are built on crushed stone/sand pads, are not anchored, and have a diameter-to-height-ratio of less then 2. Our...
  3. DBreyer

    Finding Coating defects on burried pipes with local cathodic protection

    Hi all, I'm not sure if this is the best Forum for the question, so please tell me if you know of a better one. We have a burried pipe in a tank farm, that is protected with local cathodic protection. As such there are no Isolation Flanges to the attached storage tanks. We want to assess the...
  4. DBreyer

    Induction coating removal

    Hi, we have a large storage tank (70m) where we will have to renew the internal protective coating of the bottom and 1st shell course. So far coating removal on our site was done by grit blasting which is quite costly and takes a long time. There are some companies advertising coating removal...
  5. DBreyer

    Grinnell Spring Hanger Catalogue

    Hi all, I have an existing line with an old Grinnell spring hanger. Due to corrosion on the can we would like to replace the spring hanger. Unfortunately the type label on the hanger is unreadable (I can only see B-268). I tried to identify the figure number of the hanger by measuring the...
  6. DBreyer

    Tank settlement -Reworking Foundation apron

    Hello all, we have an atmospheric storage tank (fixed roof, gasoline) that has somwhat settled over the years. Now the chime area has a lower elevation than the apron of the foundation (compacted gravel foundation with bitumen/sand cover; apron covered with asphalt). This prevents free draining...
  7. DBreyer

    Pipe support with round bars

    Hi all, I am currently looking at an older pipe which is thinning due to internal corrosion. The pipe rests on concrete sleepers with a round steel bar on top (to minimise corrosion at the support location). There is no reinforcement on the pipe itself. Now to my Question: Is there a good and...
  8. DBreyer

    Furnace Tubes with LME cracking

    Hi all, in a Naptha Hydrotreater Furnace with 5" tubes made from SS321 (in Service since 1978) on a piece of tube we removed for other reasons we, by chance, found external longitudinal cracking. Metallography revealed the cracks most likely being due to liquid metal embrittlement as they were...
  9. DBreyer

    Duplex SS ASTM 923-C vs. EN 3651-2

    Hello all, we are currently working on a new specification for Duplex SS (2205) for our site in Germany. API 938-C recommends that base metal and welds are tested to ASTM 923 Method B or C (C is the corrosion test with ferric chloride solution). According to German regulations VdTÜV 418 the EN...
  10. DBreyer

    ASTM A 387 Gr. 5 Temper Embrittlement

    Dear all, in one of my companies material specifications for pressure vessels I found a requirement for ASTM A 387 Gr. 5 having a J-Factor <150. I am well aware of the susceptibility of Gr 11 and Gr 22 in high temperature service to temper embrittlement but could not find any document...
  11. DBreyer

    NPT Coupling Bore Diameter

    Hi all, is there a guidance for the internal bore diameter of NPT couplings to ASME B16.11? From the dimensions given in the standard (taper and thread length L2) I can calculate a maximum bore diameter but couldn't find anything on the minimum diameter required? Thanks four your help Kind...
  12. DBreyer

    Feedwater heater tube-to-tubesheet weld corrosion

    Hello everybody, maybe one of you can lend me your thoughts on a reoccurring damage in one of our feedwater heaters. We found a significant amount of heavily corroded tube-to tubesheet welds (see picture). The affected welds were found on the inlet to the tubes as well as on the outlet. No...
  13. DBreyer

    Preheat temperature of A335-P5

    Hello all, in our company's internal standard until now a preheat temperature of 300°C for welding P5 piping is required. Now a disucssion is started weather a temperature range of 250-300°C is also acceptable. In every case PWHT is required so I don't worry over much about remaining...

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