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  • Users: rjw57
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  1. rjw57

    Nozzle Weld Requirements for Jacketed Vessel

    Can someone please point me to welding requirements for jacketed vessels where a nozzle penetrates both the shell and the jacket. I am unable to locate it in the section VIII div 1 code book (disclaimer - I am not a full time PV engineer ;^) ). Thanks for your help.
  2. rjw57

    Burning Off a Hydrogen Process Stream

    I am in the midst of designing a furnace which will use hydrogen as a process gas. I am attempting to locate a supplier of a system to burn off said hydrogen during the process. My problem is that I am required to burn off both a steady stream of hydrogen (1-10 SCFM) as well as a surge of...
  3. rjw57

    Equipment Drain Pressure Requirement < Return Pressure

    I have a piece of water cooled equipment which requires a low pressure at the outlet connection (closed loop system). Please assume that this low pressure outlet connection aspect of the design is not able to be changed. I must then take the flow from this low pressure outlet connection (0-5...
  4. rjw57

    Vacuum Vessel Flange Design

    I am involved in the design of vacuum vessels which operate from full vacuum to as high as 150 psig. We currently have a PE design our vessels which fall outside the "B&PV Code not required range". We have a vessel with a hinged front door so that the door can swing open for access to the...
  5. rjw57

    Long Bore Orifice

    I've been given the task of calculating the flow of a compressible fluid (nitrogen in this particular case) through a long bore orifice (it WILL potentially go sonic). I suppose the best way to think of it would be a hole drilled thru a fitting in the end of a rigid vessel. The hole is about...
  6. rjw57

    Multiple Choking Points in FANNO flow?

    I am struggling with something I have not done for some time. I am looking at a text on FANNO flow which describes how to combine loss coefficients for a series of piping components. The example is simple in that it starts with a pipeline that is larger than the downstream pipe and has a...
  7. rjw57

    Class 1 Div 2 Question

    Can an enclosure which is z-purged to reach general purpose classification in a class 1 div 2 surrounding environment house any sensors or instruments which contain the offending fluid? I have a box which contains electronics which will be z-purged and I do not believe that it would be correct...
  8. rjw57

    General Convection Heat Transfer Coefficient

    I am trying to get my arms around the methodology of calculating the subject term (typically, "h") when used in a finite difference scheme (or any other numerical approach to heat transfer) where the boundary includes a convection term. Is it as simple as calculating the convection heat...
  9. rjw57

    Fans for High Ambient Pressures

    I have an application where I would like to recirculate ~35000 ACFM of nitrogen in a container pressurized to 20 atmospheres. My boost is ~10 inches of water, putting the power required in the vicinity of 100 HP. I am having trouble finding a source for this fan application and was wondering...
  10. rjw57

    Flow Transitions (reduction/expansion)

    I am in the process of developing a mixing stage for a process I am working on. To minimize the overall length in the process flow direction, I have chosen to use mixing elements that are smaller in diameter than the upstream/downstream piping. I am trying to determine a way to minimize the...
  11. rjw57

    Transition in Pipe Size

    I am in the process of developing a mixing stage for a process I am working on. To minimize the overall length in the process flow direction, I have chosen to use mixing elements that are smaller in diameter than the upstream/downstream piping. I am trying to determine a way to minimize the...
  12. rjw57

    Flow boiling regimes question

    I am reviewing some of my heat transfer texts and finding them woefully inadequate in explaining flow boiling. I have reviewed pool boiling and the correlations associated with it. I am comfortable with understanding where I am on a pool boiling curve and the variables which affect the shape /...
  13. rjw57

    Adiabatic Gas Cooler Concept

    Hi, I am currently working on a scheme to adiabatically cool a gas stream (high thermal conductivity gas (50% mol fraction) mixed with water vapor, nitrogen and CO2) from approx 350degC to 300degC using a stream of saturated water liquid/vapor injected into the gas stream at the face of an open...
  14. rjw57

    Code Calcs - who can do them?

    Forgive me if this question has been asked in this forum before. I have done a keyword search and have come up empty, so I've at least done some legwork. My question is this - does Section VIII Div 1 specifically require the use of a professional engineer to perform BPV calculations or is this...
  15. rjw57

    Code Material Substitution

    (PLEASE NOTE: This is a crosspost with B&PV forum) I am wondering if there is any verbage in the B&PV code regarding the use of a material not specifically listed in Section II Part D and if so, where is this information located? Bottom line, I would like to use a seamless tubing supplied by...
  16. rjw57

    Material Exceptions

    I am wondering if there is any verbage in the B&PV code regarding the use of a material not specifically listed in Section II Part D and if so, where is this information located? Bottom line, I would like to use a seamless tubing supplied by my vendor as TP316L per A269 but the code does not...
  17. rjw57

    Compression Flange Bracing

    Hi, I have the AISC Manual of Steel Construction 8th Ed. (something I use very infrequently since I do not often get involved in steel design). I have been reading thru on the design of beams for a current project and am confused by terminology which I think has the same meaning. Is there a...
  18. rjw57

    SST Pipe Caps & Sec VIII Div 1

    Hi, I am trying to determine how to apply the use of a wrought stainless steel (316/316L) pipe cap in Section V111 Div 1. I have looked at UG-11 and UG-44 which reference ASME B16.9 for Wrought Steel fittings, but as I see it, the appropriate spec for wrought stainless fittings is SP-43-1991...
  19. rjw57

    "Official" Definition of an External Surface?

    Hope this isn't too bizarre a question, but is there an "official" definition for an external surface of a machined part? ANSI, ASME etc... I want to avoid a dispute with a potential client. Thanks, rjw57
  20. rjw57

    Use of Dual Certified Materials

    Can anyone shed some light on the use of dual certified materials (i.e 316/316L) and what requirements must be met to use a dual certified material as (for instance) a UNS31600 vs a UNS31603. Obviously, the allowable temperature limits and stresses are significantly different. After some...

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