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  • Users: lcmechengr
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  1. lcmechengr

    External Pressure on Exchanger Tubes

    I have a situation where I need to rerate a heat exchanger to a higher temperature and derate the pressure. The required temperature exceeds the limits of the corresponding exteranl pressure table in Subpart 3. Is it accepatble to interpolate these curves? If not, is there another method for...
  2. lcmechengr

    ASME Sect 1 Blowdown and Drain Valves

    I have had previous experience where different states have specific requirements for the type of vavles installed in the blowdown and drain lines of power boilers. Is there any where else in code other than Part PG that discusses specific requirements for valves placed in the blowdown and drain...
  3. lcmechengr

    API 650 Storage Tank?

    I need to design a stainless steel chemical container/storage tank that will be operating at atmsopheric condtions and will be protected from vacuum but it will be configured similar to a vertical pressure vessel with eliptical heads, shell, and support legs welded to the shell. Does API 650...
  4. lcmechengr

    Nozzle Length

    I have two vessel fabricated per ASME Sec VIII Div 1 and they will be attached by welding nozzles togther. To make up the appropriate distance, I will be placing a small piece of pipe equal in wall thicnesses between the two vessels. The work will be performed by a coded shop. Are there any...
  5. lcmechengr

    Non-indentifiable Material

    I have a used carbon steel pressure vessel that has no documentation of the type of material that was used to manufacture it. Destructive testing is not an option for identification. In this case, API 510 recommends using SA-283 C when analyzing the pressure retaining capabilities. Also, the...
  6. lcmechengr

    Amine Injection

    I have a situation where Boiler Feed Water has amine injected for pH control. Is there an amine concentration vs. temperature relationship where I will need to worry about SCC or general corrosion in carbon steel? Thanks for any advise.
  7. lcmechengr

    Analysis of Relief Valve Discharge Piping

    I am looking for procedure to analyze a closed relief valve system. So far, all I have run across are ways to analyze open relief valve systems. I do have access to Caesar II software. Does anyone know of any specific examples? Thanks.
  8. lcmechengr

    Backflow Prevention

    Are there any codes or standards that require that backflow preventors are installed to ensure that water used for human consumption is separated from water that can potentionally be contaminated by chemical processes in industial applications. Thanks for any help.
  9. lcmechengr

    PWHT in Caustic Service

    I have a caustic system that will typically operate at 90 deg F with a max of 20% caustic solution. The piping and equipment is constructed of carbon steel and has not been post weld heat treated. I have located several references that specifies that PWHT is only necessary for CS in 20%...
  10. lcmechengr

    Stiffening Ring

    I have an exisitng vessel that will require me to place a nozzle in the same location as an external stiffening ring. My thoughts were to replace the stiffening ring with the same or greater moment of inertia that would have to be removed by "boxing" in the nozzle. Does anyone see a problem...
  11. lcmechengr

    Pure Water Corrosion

    I have an RO (Reverse Osmosis) skid that will be installed to treat boiler feed water. The water after this treatment skid will be deiozized with a PH of about 5 - 6. What are my piping material options for this service? Is there a threshold for the percentage of deionization were carbon...
  12. lcmechengr

    Allowable Nozzle Loads

    Do any standard allowable nozzle loads exist for boiler connections? Is this referenced in ASME Section I? Thanks for any direction.
  13. lcmechengr

    Appendix 2 Flange Tolerance

    I am havinig to recommision an old exchanger, part of which I am analyzing the flanges per ASME Section VIII Div 1 Appendix 2. It appears that the body flanges have been fabricated from a slip-on flange which has had the inner portion of the flange thickness stepped done to accept the tube...
  14. lcmechengr

    Appendix 2 flanges on older vessels

    I am having to derate some older exchangers (manufactured 1957) due to component thinning. When performing the calculations for the channel and shell flanges using the allowable stresses from 1957 and the latest edition of code, I am finding that the origninal flange dimesnion do not pass...
  15. lcmechengr

    Hydrogen Bakeout?

    I have several used vessels that were previously in hydrogen service that a client has aquired and would like to return to service. Per API 941, with the expected design temps and partial pressures of Hydrogen, all of the vessels are fabricated from metals that are resistant to High Temperature...
  16. lcmechengr

    ANSI Refinery Specs for Paint Color

    I have a client that has asked if the colors of paint we are proposing to use to coat new piping agrees with ANSI Refinery Specs. I have axhausted all resource and can not find a document that recommends that a specific color paint be used to designate the fluid the piping is carrying. From my...
  17. lcmechengr

    Stiffener Beam - Tailing Lugs

    When analyzing a tailing lug connected to the skirt of a tower, compress says to use a stiffening beam when the maximum stress in base ring is exceeded. Where is this stiffening ring suppossed to be attachd? Also, I am assuming the only parameters for beam size is the cross sectoinal area...
  18. lcmechengr

    WRC 107 and Hillside Nozzle

    Does WRC 107 accurately analyze hillside nozzles or can it only be used for radial nozzles?
  19. lcmechengr

    Von Mises on Nozzle

    I am analyzing a nozzle by determining the Von Mises effective stress. From a piping analysis program, I have been provided with Axial, Bending, Torsional, and Hoop Stresses. My plan was to determine the uniaxial tensile stresses from the bending and torsional stresses using Von Mises and by...
  20. lcmechengr

    Hydrogen embrittlement of CS?

    Should there be any concern for Hydrogen embrittlement of Carbon Steel piping used in fuel gas service with high conectrations of Hydrogen? The system will be operating at temperatures less than 200 deg F. Is there a minimum temperature were Hydrogen will not migrate into the metal? Thanks...

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