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  • Users: robsalv
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. robsalv

    Questioning Balanced Bellows common wisdom

    Apologies for the cross post, but the discussion has run out in the other forum. I have a query about balanced bellows PRV's. We all know that a balanced bellows stops superimposed and developed back pressures having an additive effect on the set pressure of a spring op PRV. This is due to the...
  10. robsalv

    Challenging the common Bellows wisdom.

    A balanced bellows stops superimposed and developed back pressures having an additive effect on set pressure by virtue of a vented bonnet and a sound bellows. What happens when the bellows is cracked?? I've always assumed that this takes the bellows out of the picture and the additive effects...
  11. robsalv

    What's your company's PSV maintenance philosophy

    Dear Eng-tips members, could you please broadly describe your company's relief valve maintenance philosophy. My work place was using an empirical approach that took performance and reported condition into account when setting overhaul intervals... but we're now moving to a SIL based PRV...
  12. robsalv

    Relief valve maintenance philosophy

    Broadly describe your company's relief valve maintenance philosophy. My work place was using an empirical approach that took performance and reported condition into account when setting overhaul intervals... but we're moving to a SIL based PRV management process that doesn't take into account...
  13. robsalv

    Why does gland packing blowout?

    Ok, the subject sounds like a noob question, but after 18 years in industry, I still haven't had a decent explanation regarding sudden and catastrophic failure of packing materials under pressure... I've seen the aftermath a few times though - thankfully never associated with an injury. We just...
  14. robsalv

    Charpy U v's V and brittle failure FFS

    Just continuing on from thread330-211640 I have access to some oldish Exxon ERE data which correlates Charpy U with Charpy V. For example, some 3.5Ni plate that was Charpy U'd in 1960 to confirm a -101degC MDMT, is said to be the equivalent of a -97.5DegC MDMT. Given that the correlation has...
  15. robsalv

    API 579 FFS1 controversial(?) B.F. review questions

    I have a old 3" (77mm) thick vessel made from circa 1958 AS B58 Australian steel, which I believe is equivalent to A201 grB. The vessel was stress relieved at the time and 100% radiographed. According to the API579 fig3.4M MAT curve, the steel has a MAT of 44degC (111degF). Since API579 doesn't...
  16. robsalv

    Old Australian steel, MDMT calc, AS vs API579

    Hello colleagues. We have three 1960 package D type boilers. The steam and mud drum are made from AS B58 gr A as rolled plate, circa 1958. They were post weld heat treated at the time. The steam drum is about 77mm (~3")thick. We have reason to doubt the early 90's determined MDMT / MAT for the...
  17. robsalv

    How does a service station pump, pump!

    Was just in discussion with a colleague and talking about service station underground storage tanks and how water might form in the tank following the displacement of fuel and the ingress of air through the breather. Air carries moisture, moisture condenses on the U/G tank walls, water trickles...
  18. robsalv

    Stainless grade low temperature properties question

    I was having a chat with a colleague, who had a supplier come back to him saying that they couldn't supply all stainless components in 304L or 304/L and could supply some small bore 800# valves in 304H instead. He is managing a low temperature service project (about -101degC). I alerted him to...
  19. robsalv

    Anderson Greenwood 700 series POSV. Experiences?

    Folks, We're considering the use of an AGCo series 700 POSV, which is a metal seated double pilot, POSV suitable for steam (section VIII) service. http://www.andersongreenwood.com/pilot_operated.asp It's fairly new in the Tyco line up and i was wondering whether anyone would please share...
  20. robsalv

    Can you take credit for a localised MDMT < Vessel MDMT?

    Basically, when reviewing an existing vessel's MDMT / MAT, every part of the vessel construction is reviewed and the warmest determined MDMT sets the vessels MDMT. That is the level 1 view. This suggests that some parts of the vessel are suitable at lower temperatures. Hold that thought...

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