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  1. mrsteam

    "Rapid fluctuations in pressure" per UG-36?

    UG-36(3) defines cases when additional reinforcement is not required for nozzles. This however applies to "Openings in vessels not subject to rapid fluctuations in pressure..." Does anyone have a more precise definition? What is considered a rapid fluctuation? Is there a frequency...
  2. mrsteam

    Seat ring with flat cover

    Thank you very much for your replies. I have checked with the local Boiler & Pressure Vessel authority, and they have also agreed that I could assume this seat ring to be a slip-on flange, and show calculations for the geometry constraints on the lap joint, and shear stress on the fillet weld.
  3. mrsteam

    Joint Dimension on Table UW-12

    Thank you very much for your replies. I have confirmed also that it is material thickness that this refers to.
  4. mrsteam

    Joint dimension in Table UW-12

    Table UW-12, for type (4) joint, specifies that Category C circumferential joints should not be over 5/8" thick. Is this refering to the weld leg / collar dimension of the fillet weld? Or to the thickness of the components being welded together? If neither, what does it refer to? Thank you...
  5. mrsteam

    Joint Dimension on Table UW-12

    Table UW-12, for type (4) joint, specifies that Category C circumferential joints should not be over 5/8" thick. Is this refering to the weld leg / collar dimension of the fillet weld? Or to the thickness of the components being welded together? If neither, what does it refer to? Thank you...
  6. mrsteam

    Seat ring with flat cover

    I have a design that uses standard pipe as a shell. At the top of the shell we are adding a very short run of a larger diameter pipe of heavier schedule (call this the seat ring), attached to the main shell by a lap joint double fillet weld (main shell fits on ID of seat ring), in order to...
  7. mrsteam

    Swing bolt suppliers for pressure vessel covers

    Hi everyone, I am new in the field of Pressure Vessel design, and our company is in the design process of some small vessels. I need to find an outfit that can supply swing bolts (or eye bolts), of different lenghts (I need between 6" and 7" long from the center of the eye), either 3/4" or 1"...
  8. mrsteam

    SA 234 WPB Pipe caps

    ASME B16.9 table I-10 (Dimensions of Caps), General Note (2) indicates that "The shape of these caps shall be ellipsoidal and shall conform to the shape requirements as given in the ASME Boiler and Pressure Vessel Code." Given that, if a manufacturer tells me that their cap conforms to ASME...
  9. mrsteam

    Dynamic Load Analysis on Truck Mounted Structures

    Thank you Greg for your input... Here are answers as best as I can: 1. Truck is for oil and gas industry, it is a Cementing / Acidizing Unit, so it carries, besides the tanks, some heavy pumps, both centrifugal and triplex type. 2. Yes, we know "quick" tends to be wrong, but we could say I'm...
  10. mrsteam

    Dynamic Load Analysis on Truck Mounted Structures

    I am currently working on truck mounted equipment which includes three tanks, and an Operator's Cabin, all mounted on Hollow Structural Steel... Other equipment includes piping, and some pumps. I am particularly concerned about the dynamic loading the structural supports for the tanks and...
  11. mrsteam

    Flow measurement on Cement Slurry

    Does anyone have any experience with flow metering in cement slurry applications? We are looking at flowrates between 50 and 500 GPM, with pressures between 1 psig and 70 psig. Flow is pure Cement Slurry (similar to Portland cement), no other solid add-ons. I have been suggested a Mag meter...
  12. mrsteam

    Fluid properties of cement / concrete

    Would anyone have information regarding fluid properties of cement / concrete? Specifically I need viscosity at ambient temperature... Thank you
  13. mrsteam

    Axle weights

    My apologies for not replying... Got caught in many other issues with this project... And unfortunately I do not have Matlab, nor have I ever used it. I tried to translate the code to actual equations but could not. So I am still trying... I do gather that you are using spring loads at the...
  14. mrsteam

    Very high turndown flow meter

    Regarding the DP transmitter, in order to work with such a high turndown ratio it would have to be used with some kind of variable area flowmeter, wouldn't it? An orifice plate wouldn't cut it. The problem with this is that you require some amount of pipelength before and after, and space is a...
  15. mrsteam

    Very high turndown flow meter

    Thank you all for your valuable input. And once again I apologize for the lack of info: the controlled device is not a valve, but actually a progressive cavity pump with a variable speed hydraulic motor... OK, I guess the controlled device will be a valve, in this case controlling the...
  16. mrsteam

    Very high turndown flow meter

    OK, I am told that viscosity of the fluid is a big factor for sizing and spec, at least for coriolis meters. Would this be the case for all types of flowmeters? Or could we find one for which viscosity would not be much of a problem?
  17. mrsteam

    Very high turndown flow meter

    OK, a little more info on accuracy needed... We could actually go to 0.5% of measured value at the high end (20 L/min), and could go up to 1.5% of measured value at the lower end (0.3 L/min)... I have been suggested a coriolis flowmeter... As a matter of fact, a special model could give 0.8% of...
  18. mrsteam

    Very high turndown flow meter

    Sorry, I guess I didn't give enought details. 1.5" line size, liquid flow, 0.3 L/min to 20 L/min variable flow rate depending on application, accuracy as good as we can get (ideally not more than 0.5% full scale). DP meters are out of the question, unless they can GUARANTEE accuracy over the...
  19. mrsteam

    Very high turndown flow meter

    I have an application where I need a flowmeter capable of a turndown ratio of almost 70 (0.3 L/min to 20 L/min)... So far I have not found a single flow meter that would do the trick. Also, this meter will be measuring a controlled variable on a PID control loop, so decent accuracy is needed...
  20. mrsteam

    Axle weights

    mloew, Were you able to send info regarding calculations on Tridem drive trucks? What if tridem drive consists of Independent suspensions on each axle? (Here we are talking about Neway AD378 Barpin). I am actually in need to calculate more accurately the load on steering axle. I have used...

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