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  1. robsalv

    UAN32 Storage Tank - Urea Ammonia Nitrate

    An old engineer once told me, "Rob, your job as a technical expert in the organisation is to give the technically correct answer. Let the managers worry about the money". That's still a motto I live by today. I don't know much about UAN, but I understand that when it is not properly cared for...
  2. robsalv

    UAN32 Storage Tank - Urea Ammonia Nitrate

    I don't think I understand that question. In my jurisdiction, the EPA guidelines would spell out the ammonia vapour restrictions. You would give the client a range of options from lined carbon steel to intrinsically corrosion resistant materials and costs. An indication of the life cycle...
  3. robsalv

    Open topped water tank, question about wind generated wave action

    Thanks for the replies. After trawling standards and codes, I figured that wind assisted wave action wasn't a huge issue. So it's reassuring to get your replies. Naturally, so long as the tank was designed to structurally withstand design wind loads and remains fit for purpose, this tank should...
  4. robsalv

    Open topped water tank, question about wind generated wave action

    Hi Folks, Currently tyre kicking API 650 and various forums regarding whether there might be any specific issues to be concerned about in respect of wind generated waves inside a 100 ft diameter, 48ft high, all welded carbon steel open topped tank. The tank construction is circa 1960 with the...
  5. robsalv

    BS 3059 : 1958, Boiler tube standard, hunting for some information

    Hi ET peers. We have a circa 1960 B&W D type package boiler with some serious issues and need to do some fitness for service calcs on the (severely corroded) floor tubes. They are listed as 3.25"OD x 6WG BS3059/13 tubes, assumed to be carbon steel. Unfortunately much of the original original...
  6. robsalv

    Hi Temperature bolting query raised in pondering a company engineering specification B8M cl1

    Thanks XL83NL. I'll give that link a look later on. We tend to run a retensioning step once a critical hot flange has come up to temperature. It's not a perfect or even ideal approach, but in terms of seat of the pants maintenance engineering, it's held our 24hr production operation in good...
  7. robsalv

    Hi Temperature bolting query raised in pondering a company engineering specification B8M cl1

    ...well now that you put it like that, that makes a lot of sense! [smile] If the service provides some stress relief, it won't be possible to reliably predict the reduction in strength of each bolt, rendering assumptions and calculations unreliable. Thanks TVP. - - - - - - - - - - - - - - -...
  8. robsalv

    Hi Temperature bolting query raised in pondering a company engineering specification B8M cl1

    Hi Folks. There seems to be fewer bolt queries in this forum than in the materials forum, but I figure I should ask a bolting question in the right forum first up, so hopefully you can help me out. In looking through a company engineering spec regarding bolting and flanges, it conspicuously...
  9. robsalv

    Rear wheel gyroscopic stability query

    "Bicycle wheels weigh ~ nothing. Motorcycle wheels have more mass." ...would be my argument too. It would seem to be so obvious that I can't believe two motorcycle related wiki entries have this glaring error... I was hoping to get something more concrete before registering on Wiki and pointing...
  10. robsalv

    Rear wheel gyroscopic stability query

    Just how much contribution does the spinning rear hoop provide to motorcycle stability? The current version of the wiki on motorcycle and bicycle dynamics says that it's not much, however it is referencing two bicycle papers, which are hardly ideal motorbike analogs with respect to rear wheel...
  11. robsalv

    Long Internal Inspection Intervals - via RBI or Code

    BigInch, yep, that is fully understood and is correct practice for a time based degradation mechanism. The question is where you can't determine a defect/degradation mechanism! SJones, that report seems like exactly what I'm looking for. It's just downloaded. I'll be getting a coffee and...
  12. robsalv

    Long Internal Inspection Intervals - via RBI or Code

    Folks, My plant is in the middle of an RBI review program. The regulatory regime is a self regulating safety case based environment where we are held accountable to our own engineering judgement. We see some great opportunities to apply long internal inspection intervals on critical process...
  13. robsalv

    PSV Relief Requirements

    Why is there a water level in an air receiver drum? At our plant, drums with no liquid service automatically get exemption from having a fire case considered for SV sizing. - - - - - - - - - - - - - - - "Life! No one get's out of it alive." "The trick is to grow up without growing old..."
  14. robsalv

    Parallel slide valves, any experience in HC service?

    Apologies for cross posting, but I wanted to get an operators point of view on the question below. Cheers. I've had a question from a manager, asking what I thought about parallel slide valves in HC isolation service. I don't think they're a good idea in HC services since they are only leak...
  15. robsalv

    Parallel slide valves in HC service?? Your experiences? Recommended?

    Thanks for your comments gents. I believe we have one of these valves in storage and a need to replace an inservice valve... so I suspect there's a cost motive and also a testing the boundary motive in the manager's question. The type of valve is as described in the pdf at this link...
  16. robsalv

    Parallel slide valves in HC service?? Your experiences? Recommended?

    I've had a question from a manager, asking what I thought about parallel slide valves in HC isolation service. I don't think they're a good idea in HC services since they are only leak tight whilst there is upstream pressure. Lose the pressure and their ability to isolate effectively is...
  17. robsalv

    Chinese manufactured 600# valve bonnet studs

    I was forwarded an email today... I don't know what the timeframe of the incident was, but the attached photo should strike fear in the heart of any decent engineer. It relates to compromised bonnet studs of 600# class, WCB 16" gate valves apparently supplied out of China. This is the text...
  18. robsalv

    Solubility of metals as a function of pH

    Interestingly I just had a manager ask the same question. I said that directionally, lower pH's mean more corrosion, but it's also a function of temperature and oxidising strength of the acid. In our case we have a hydrocarbon process stream into which a range of organic acids condense as the...
  19. robsalv

    Parallel Relief Valves

    Drexl, I'm surprised that you're not convinced. A prime cause of chattering is an SV providing more capacity than required for the lift event. Do you agree? SV design contingencies are usually special events (cooling water failure, fire, blocked in etc) so as a result, MOST lift events are...
  20. robsalv

    Steam Trap

    Vaione, there are many steam expert crowds around who will audit your system and come up with recommendations. There expertise comes into its own in regards to boiler operation, but the rest of it is not rocket science. Good and appropriate insulation, good and appropriate steam trap and repair...

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