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  1. crazyjpeters

    B31.1 Threaded joint limitation - hydrotest truck connection

    I understand there’s limitations on threaded joints in B31.1. Makes sense. When doing pressure testing (hydrotest) beyond the pressure limit of said piping size, what’s the method for connecting temporary hydro testing equipment? We have used a hammer union welded into the piping system, but...
  2. crazyjpeters

    Continuous Blowdown Tank vs Steam Separator - Is there a difference?

    I understand a blowdown tank's function. Note that this is a continuous blowdown tank, not bottom or intermittent blowdown. It is intended to be receiving blowdown constantly, to maintain low silica and to control cation conductivity. I would say in our operation, intermittent blowdown (IBD...
  3. crazyjpeters

    Continuous Blowdown Tank vs Steam Separator - Is there a difference?

    So, I'm in the midst of evaluating / modifying our CBD tanks, which were really never evaluated when they switched from AVT(R) to AVT(O). In searching for a maximum nozzle velocity, what I've come to notice is that "Blowdown tanks" CBD or IBD, and any design resources/guides seem to show them...
  4. crazyjpeters

    CBD Tank - tangential nozzle velocity

    So georgeverghese you've got some guidelines there that are somewhat momentum based. I would think that's what I need to find to really put my mind at ease. KevinNZ, do you happen to know what steam quality you flash to in the vessel? That might give me some idea.
  5. crazyjpeters

    CBD Tank - tangential nozzle velocity

    Thanks all for the helpful suggestions. The path forward for now appears to be that we'll replace the elevation of the tank with a prefabricated nozzle section, consisting of a 6" SCH80 nozzle, a 1/2" wear plate, 3/8" shell and 3/8" reinforcement. This all satisfies section 8 div 1...
  6. crazyjpeters

    CBD Tank - tangential nozzle velocity

    The likelihood of us replacing the tank is pretty small. What we’d likely do is redesign the nozzle section, cut it out and weld in the redesigned section. Do you think the 1.5” nozzle for a 60,000 lb/hr flow is still reasonable? Is doubling the number of inlets something worth pursuing? I...
  7. crazyjpeters

    CBD Tank - tangential nozzle velocity

    The tank construction is much the same as you assume. 3/8" carbon tank shell, but only a 3/32" 304-SS circumferential liner (360degree in this case). Our problem originally was that we blew right through it in 7 months. My original assumption was that the nozzle velocity was too high...
  8. crazyjpeters

    CBD Tank - tangential nozzle velocity

    I'm evaluating one of our flash tanks which has experienced concentrated erosion directly downstream of the tangential inlet nozzle. I've seen this posting regarding a similar topic: https://www.eng-tips.com/viewthread.cfm?qid=125547 The tank I'm evaluating has a blowdown throttling valve...
  9. crazyjpeters

    Rigid coupling design - friction of bolted shaft flanges

    Whoa, you guys don't need to analyse it for me, but thanks for the good discussion. The OEM actually hasn't left much of a SF by my calculations, but then this is actually a francis turbine mounted to the other end of the coupling, and there is a fairly large upward force generated, which...
  10. crazyjpeters

    Rigid coupling design - friction of bolted shaft flanges

    The design is the OEM's. I'm just trying my best to verify their design, and perhaps suggest improvements to the plant (27-30MW @720rpm, maybe my math is wrong on the torque). As the coupling is 750mm wide, and the friction coating is just a single pass with a paint gun, maybe a couple of...
  11. crazyjpeters

    Rigid coupling design - friction of bolted shaft flanges

    Hi Tmoose, I'm actually investigating this for a coupling theoretically subjected to what I think translates to 1.8million ft-lb of torque. I'm also well aware at how poor a torque wrech is at applying a set preload (and how little I can trust the stamped 8.8 grade chinese made bolts at this...
  12. crazyjpeters

    Rigid coupling design - friction of bolted shaft flanges

    Friction between flanges is the "only" shaft torque transmission. That's the only thing stopping coupling slippage before it encounters the shear of a bolt. The point is never encountering a bolt in shear. I'm looking for something with a solid theoretical basis, or an empiracle formula that...
  13. crazyjpeters

    Rigid coupling design - friction of bolted shaft flanges

    I cannot seem to find an answer anywhere, so I'm hoping some bright individual will be able to enlighten me. I'm analysing a large machine shaft coupling, which is a bolted flange design, clearance bolt holes (not fitted bolts), where torque is to be transmitted through friction of the faces...
  14. crazyjpeters

    Hydropower ball valve - High Head, silty water

    It's the design requirements that make this one expensive. It has to have retractable seats, hydraulically operated with water pressure to seat and retract. It has to close under full flow. It has to be certified dead-end service. It has to fit into the same envelope the other one was in...
  15. crazyjpeters

    Hydropower ball valve - High Head, silty water

    Hi All, I'm trying to source a valve for a hydropower station, with 700m head and 5cms flow (1000psi, 80,000gpm) and the water is fairly silty. The original was a trunion mounted ball valve, and the supplier was bought out by another manufacturer, who I've requested a quote from already. The...

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