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  • Users: iangineer
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  1. iangineer

    Waste Heat Boiler - PG-58.5 include first valve?

    ASME Sec I, PG-58.5 states "Miscellaneous piping shall include any piping, not otherwise described herein, that extends to or from the boiler proper up to the first stop valve or instrument". Do the requirements of the mandatory certification and ASME Data Forms include the valve or just the...
  2. iangineer

    Static equipment training recommendation

    I work at a chemical plant in the United States as an engineer who deals with all pressure vessels, piping, tanks, any equipment that doesn't typically move. My job is to tell people how to fix stuff that breaks/leaks, let them know how long it is expected to last before it should be...
  3. iangineer

    Glass Column minimum thickness suggestion

    I have a 1000mm diameter column made of borosilicate glass 3.3. It is not glass-lined. It is actually just glass. Process is sulfuric acid. Design pressures and temp = -14.5 psig and 5.8 psig @ 392°F My question is: How do I go about determining how thin the column can get before it...
  4. iangineer

    Glass and PTFE lined pipe flange assembly

    I can find very little information for glass-lined and PTFE-lined pipe flanges. I have reviewed my plant's procedures, but they do not reference any standards outside of the company. Do any of you have any experience with assembling glass/PTFE lined flanges, and/or know of any standards that...
  5. iangineer

    Yield Strength of 24CrMo5 studs

    Hi all, I've been tasked with providing torque values on some studs in an old German-made high-pressure vessel. Do any of you have any information on the yield strength of a 24CrMo5 stud at 392°F, or could possibly point me in the right direction to a code that states the information, please...
  6. iangineer

    Shell and Tube Thimble Plug for leaking tube

    Hi all, and happy new year! I come to you today to ask for any assistance or knowledge on the use of thimble plugs for plugging a leaking tube in an exchanger. I cannot find any information about them online and am not sure where to look in any code books. I have attached a drawing of one and...
  7. iangineer

    316L weld metal buildup to restore base metal on tower

    All, I have a tower made of 316L SS that has some corrosion due to the acid service. The minimum wall thickness due to internal design pressure + hydrostatic head is 0.429". Some areas around the bottom of the tower show thicknesses close to 0.350". An FFS evaluation passes at Level 2 for 5...
  8. iangineer

    Pile Driving Near Chlorine Pipeline minimum distance

    Hi everyone, I'm not familiar with pile driving or what specifications are used with the design of a procedure to do so. A contractor is planning on driving piles about 5 feet from an underground chlorine line. I don't have much other information on it, but mainly wanted to see if there was...
  9. iangineer

    PCC-1 Table 0-4.1 Bolt Stress Limit for Series A really low

    Hi all, PCC-1 Table O-4.1-2 Bolt Stress Limit for Series A flanges looks really low. All of them range from 28ksi to 37ksi. That seems really low compared to what I calculate they can handle. For example: 36" 150# Series A flange is 2" thick. I calculate that the maximum bolt load for...
  10. iangineer

    API tank supported cone roof repair

    I found this thread (https://www.eng-tips.com/viewthread.cfm?qid=477970), but little else that answers my question. I have a tank that has a few small holes in it and some thin areas. API 653 hardly gives any guidance on repairs for roofs, so we tend to just patch them with patch plates that...
  11. iangineer

    LG FF Stud Pad flange. What is LG?

    I have a vessel with a flange described as "24in-600# ANSI LG FF STUD PAD". Can a flange be "large groove" and "flat faced"? I am doing a joint analysis to determine best torque required and have not come across an LG FF Stud Pad before. Just trying to figure out how best to describe it...
  12. iangineer

    Determine Roof Live Load

    A coating contractor requested information on loads for an API tank roof that needs to be painted. The tank was designed to API 650 App F, so I used F.6.1 to determine the load based on information I have. Can y'all let me know if I went about this correctly, please? I basically used the tmin...
  13. iangineer

    Requirements for recommissioning ASME Sec VIII pressure vessel

    A pressure vessel was removed from service 4 years ago. Due to some issues that developed from its removal, the plant wants to put it back into service. Are there any particular requirements for recommissioning an ASME VIII PV? This particular vessel is a liquid knock-out drum for a...
  14. iangineer

    API shell thickness using corrected height

    I make excel sheets to help me remember things I figured out before. On my spreadsheet for tank wall minimum thicknesses, I use a corrected height H'=H+(2.31*P/G). H=actual liquid height, P=pressure, G=specific gravity. In reviewing my spreadsheet, I did not reference where I got H' from and...
  15. iangineer

    API Tank door cut: when to require stiffeners

    Can anyone point me in the direction of some calculations to help me determine if I should recommend stiffeners for a door cut into an API tank? Recently a 6ft x 6ft door was cut into the side of an ~80ft diameter tank to do some work, and I would think stiffeners would be needed for such a...
  16. iangineer

    API 653 Lap Patch Hole Size

    API 653 sec 9.3.2.1 states that minimum hole diameter for use of lap patch is 2". Do you all agree that if I have a 1/2" corroded hole, that it would need to be cut/drilled out to 2" diameter for a lap patch to be used?
  17. iangineer

    Hot Tap: When would a backing ring be needed? Valve test?

    I am working on updating the hot tap procedure for my company and one of the comments on updating is that the question of using a backing ring always comes up. I can find very little on the use of backing rings for hot tapping. Question 1: Should backing rings ever be recommended? If so...

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