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  1. ApC2Kp

    Weld Overlay of Sealing Areas

    The common carbon steel gate/globe/check valves with metal to metal seats use different materials for trim & provide longer life for shut off. Small amount of corrosion or erosion of body does not result in leak failure, but small amount of corrosion in seat area results in leak-thru that could...
  2. ApC2Kp

    Schedule of piping for saturated steam

    JrValveEng, The ASME B31.1 Power Plant Piping code material allowable strength had a 4:1 design factor for decades, until it was recently 'reduced' to a more economical 3.5 :1 design factor that is consistent with the same design factor in ASME Section I Fired Pressure Vessels. The B31 Code...
  3. ApC2Kp

    Preferred coating for spool valve...

    quizzical1, Check with General MagnaPlate for their NEDOX coating. They have other systems that might be adequate instaed of the premium NEDOX coating.
  4. ApC2Kp

    LPG truck loading facility design

    adt10, Many LPG loading stations use Blackmer or Corken pumps. Check for their recommended piping and recirculation configurations. There are a number of emergency shutdown valve, back check valve, excess flow valves, and remote trip valves offered by Fisher Controls -Regulators Division, and...
  5. ApC2Kp

    Internal Pipe Corrosion from Seawater

    apark19, Shipboard water desalination systems have ductile iron piping as entry level material of construction, while nuclear submarine water desalination systems use titanium - a wide extreme indeed. The older power plants at coastal locations had ductile / cast iron used for seawater cooling...
  6. ApC2Kp

    Excessive(?) boiler make up water

    bmehank, There is some loss of steam through the thermostatic air vents at the radiators. Assuming that there are air vents on the radiators, consider the following. "Steam pressure is less than 1 psi at radiator inlets." would result in partial vacuum in radiator during cycle 'off' when...
  7. ApC2Kp

    Reductions on ASME B16.5 and B16.11

    JuanVega, See ASME B16.9 Table 11 for reducer buttweld fittings.
  8. ApC2Kp

    Urgent : Welding in Pressurized line with High Temperature

    ak1965, You could have more concern for the weldolet A105 material at 400 deg C service. Perhaps a weldolet of material to ASTM A182 Gr F11 would be more suitable and compatible to the A213 P11 piping. The observations of metengr are good, and while many hot tap operations are performed...
  9. ApC2Kp

    Are there any standard pipe systems worldwide?

    Redmar, A marketing guy asked Engineering why they did not have a standard design plant to offer to clients. Engineering replied that they would make a standard design plant, once Marketing had found a standard customer.
  10. ApC2Kp

    B31.3 Catergory D Fluid Service

    colar, The rationale for Category D fluid services would be based on nonhazardous substances at moderate conditions of the pressure less than 150 psig and temeperature less than 400 deg F. The typical nonhazardous substances would be air, water, nitrogen, and steam less that 150 psig...
  11. ApC2Kp

    Oversized steam traps?

    david6245, The inverted bucket traps could operate on higher pressures with the smaller orifices. The IB mechanism has weight to pull the valve open away from the orifice seat. Larger sized orifices of IB traps have less ability to open the valve against the steam pressure. So it would be...
  12. ApC2Kp

    Backflow Prevention System

    claimslitigation, There are now a number of state and municipal codes available free, including California and cities, at http://bulk.resource.org/codes.gov/ca.local/ You may find it useful to retain a licensed plumber that is familiar in the local plumbing code, as an expert witness...
  13. ApC2Kp

    B31.3 RT requirement (5% Random) for girth welds

    nichols 7007, ASME B31.3 (b) 1. states, " Not less than 5% of circumferential butt and miter groove welds shall be examined fully by random radiography in accordance with para. 344.5 or by random ultrasonic examination in accordance with para. 344.6. The welds to be examined shall be selected...
  14. ApC2Kp

    B31.1 cyclic condition question

    JAYDEE23, The B31 allowable stesses for the materials in Table A-1 thru A-7 have been established for 7,000 cyclces based on a daily start / shutdown for approximately 20 years. If there is more frequent thermal or pressure cycling, then the designer would need to evaluate and apply factors to...
  15. ApC2Kp

    PMI results 316L welds

    jrupert24, The seeming loss of nickel would be a puzzle. A comparison of melting / boiling points might shed some understanding. Nickel Ni 1455 deg C melting, 2730 deg C boiling, Iron Fe 1539 deg C melting, 2740 deg C boiling, Chromium Cr 1890 deg C melting, 2500 deg C...
  16. ApC2Kp

    Tube Sheet Crack

    steamer1966, Let's see, it might be a firetube waste heat boiler. Steel material A285 / A515. Tube size 2 inch. Tubesheet thickness 2 to 3 inches or more. A crack in the outlet tubesheet, upper quadrant. Maybe 20 years service on the boiler. How much of this is your situation? Some attempt...
  17. ApC2Kp

    SS for this water?

    YAHA, The temperatures of the seawater are good for HDPE plastic pipe and the HDPE is also a good choice for underground installations. Look for KWH, Weholite, Polypipe, Rinker, Performance Pipe, Kanalrohrsysteme, and others for polyethylene piping systems. Diameter to 750 mm and larger are...
  18. ApC2Kp

    Air compressor auto drain help?

    beattsmjk, The Armstrong Int'l Co. has a number of liquid drainers along with their steam trap models that drain condensate from steam piping and equipment. Their Series 1-LDC is capable of your design pressure and probably has adequate capacity. The plastic body might not be preferred, but...
  19. ApC2Kp

    Painting pipe to reduce corrosion

    MECE02, Consider the cost of stainless steel piping, if the owner does not want to paint the pipe. He may then include some budget for coating /maintaining the paint on the pipe and the structure. Some steel vent stacks have been justified to be installed in stainless steel instead of carbon...
  20. ApC2Kp

    Saltwater Corrosion on Pipes

    cobaltman, The small to medium size Nps-24 pipe lines for saltwater service could be in ductile iron material. Some coastal cities have seawater piped in DIron to the fire hydrants and the seawater also used for street washing. The entry level piping material for shipboard desalination units...

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