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  • Users: cedeng
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  1. cedeng

    Dent in tank shell

    I have a 35 ft atmospheric tank which shows some dent (inward deformation). Bulge would be a better word but bulge is for outward deformation. How can I evaluate them for integrity and return in service ? API 579 don't include cylindrical with more than 42 inches diameter...(section 12). Can...
  2. cedeng

    What are ''davit'' clips ?

    Could anyone send me a sketch or picture of a ''davit'' clips, which I really don't know what it is ? I'm reading API 653 Annex C checklist for my first inspection in the next weeks, but I'd like to know what are ''davit'' clips on C1.3.2 for example, and this before I go on site. Thanks Ced
  3. cedeng

    Bearing destruction due to lack of lubrication

    Hi I would like to know the typical destruction scenario of a bearing (ball, approx 2 in., no trust) having lack of lubrication (almost no lubrication at all). For example, inner ring is rotating (fit on the shaft), outer race is fit in the casing, no rotation. RPM = 3600 1- How much time it...
  4. cedeng

    Increase pipe schedule - influence on pump ?

    Hi We have some corrosion problem in my acid piping and I would like to increase the pipe schedule from SCH 10 to SCH 40 for 3'' and 6'' diameter (SS316L). I want to know if the increase in pressure drop (lowering the ID) will affect my pump (total Head). Is it significant ? How can I...
  5. cedeng

    Is Hot water pump a pressure vessel/tank?

    Hi We received this morning a hot water pump at the shop, pumping to pressure over 300 psi. It is a 3 inches pump in Cast iron. We found a crack in the casing. Is it included in ASME pressure vessel Code ? Do I need to use a qualified procedure, welder, etc.. I just want to know if I can...
  6. cedeng

    Cooling tower Fan failures

    Hi I'm working on the case of our cooling tower fan (Hamon-Sobelco fan) whom brake in the blade holder (good term?). Blade holder is cracking at bolt hole (which retain blades) and advance in fatigue propagation. It is 40'' diameter and 1 inch thick. What could be the cause of failure ...
  7. cedeng

    ASME P Numb SA36 vs CSA G20.1 44W

    Hi I did a procedure qualification, here in Canada, P1-P1. I used CSA G20.1 44W (low carbon steel) plate for my RMS. The inspector said that 44W is not a P1 as ASME code. My metallurgical consultant said yes (he said to me to use that one). 1- Is there a place in the code where 44W is...
  8. cedeng

    Hardness for 50 mm dia. shaft in 1045

    I need to know the best hardness for my industrial 50 mm diameter shaft in AISI 1045 material. I don't wanna be too hard because I don't need strenght, I need wear resistance (with the key). I was thinking around 30 HRC. Is it too brittle ? Cedric
  9. cedeng

    MONDI Cast iron, what kind of graphite ?

    Who know MONDI pipes (cast iron) ? I want to know what is the type of graphite in the structure of a MONDI pipe. Is it spheroidale (ductile), flakes, big flakes, ??? We have pipes from few supplier but we can not know which one is which. The only thing we know is that MONDI pipe is good for...

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