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  • Users: Angsi
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  1. Angsi

    Max No. of Openings in 2:1 SE Heads

    Simple question - Take a 2:1 SE Head on a Div I vessel. What is the maximum number of nozzle openings (in terms of area m2 relative the the dished area) that I am allowed to place on the head? Are there any restrictions on this by ASME Code? If so which para? Many thanks.
  2. Angsi

    Re-Rating Heat Exchanger Buitl in 2000

    Equipment: Shell and Tube Heat Exchanger designed to ASME Div 1 This is a simple question. If the tubesheet of the exchanger was designed and built to TEMA in 2000, and if there is a need to re-rate and re-certify the exchanger now, will the calcs have to be based on the latest ASME VIII...
  3. Angsi

    Hastelloy C-276 and Sodium Hypochlorite

    Location: Offshore Platform ============================= I understand Hastelloy C-276 reacts with sodium hypochlorite which is used on offshore platforms to prevent marine growth/fouling of pipework. 2 ppm is what we will normally specify for continuous dosing and for intermittent shock...
  4. Angsi

    A Fundamental Question Regarding Weep Holes

    Design Code: ASME Section VIII ============================== Can someone please tell me if the weep holes at the reinforcing plate is sealed after the vessel is put into operation? Or should it be left open? Why? I understand the weep hole is to detect leakages in welds during hydrstatic...
  5. Angsi

    Internal Coating Failures in Deaerator Towers

    Location: Offshore Platform Fluid: Seawater Capacity: 46,000 bpd ===================== The water Injection System consist of a Deaerator Tower, Coarse and Fine Filters. In the past we have been using glass flake lining and Monel/Super Duplex Stainless Steel internals. However, we are...
  6. Angsi

    Deaerator (Seawater) Tower Coating Failure

    Location: Offshore Platform Fluid: Seawater Capacity: 46,000 bpd ===================== The water Injection System consist of a Deaerator Tower, Coarse and Fine Filters. In the past we have been using glass flake lining and Monel/Super Duplex Stainless Steel internals. However, we are...
  7. Angsi

    Hot Oil System Rating

    I came across an article by a Heating Oil Supplier (Therminol) saying that if the supply temperature exceeds 175 deg C, it is prudent to have the piping pressure class in 300# minimum (even if the design pressure/temperature rating allows the applciation of 150#) to ensure "leak tightness" of...
  8. Angsi

    U-Tube Exchanger

    Equipment: TEMA S&T Heat Exchanger, BEU type. Design: ASME Div 1/TEMA Service: Crude Oil Cooler Location: Offshore Platform Tubeside, 316L, Shell side CS (Cooling water) ============================================= We plan to rerate an existing S&T Hex which has already been operating for a...
  9. Angsi

    10/13 Rule for Shell and Tube Heat Exchanger

    Simply put, has anyone heard of the 10/13 Rule in ASME VIII with regards to the design of shell/tube side desing pressures? In the past we have used the 2/3 rule whereby if the low pressure side design pressure is less than 2/3 of the high pressure side, a rupture disk shall be installed in the...
  10. Angsi

    PCHE

    We are looking at using PCHE (heatric) for a clean gas/cooling water service operating at temperature above 50 deg C (but below 100 deg C) in an offshore marine enviroment. From what I understand, 316L is not accpetable for application above 50 degC in an offshore marine environemnt and due to...
  11. Angsi

    PCHE

    We are looking at using PCHE (heatric) for a clean gas/cooling water service operating at temperature above 50 deg C (but below 100 deg C) in an offshore marine enviroment. From what I understand, 316L is not accpetable for application above 50 degC in an offshore marine environemnt and due to...
  12. Angsi

    Duplex Dished Head

    Code: ASME Sect VIII, Div 1 Is it normal to request for a head forming test piece for Duplex materials i.e. semi ellip from a flat plate? What are the concerns? Does cold working affect mechaical and corrosion properties of the duplex material? Thanks in advance.
  13. Angsi

    Cast Vessel to ASME Div I

    Co. plans to purchase a cast stainless steel vessel (a cyclone separator, Kelburn). This vessel will be designed to ASME Div I. Has anyone the experience purchasing cast stainless steel vessel? Besides its inferior nozzle loading issues, are there anything else I need to lookout for compared...
  14. Angsi

    Tube to TubeSheet Joint Load Test

    For a double grooved and expanded tube to tubesheet joint is it normal to request mock-up tests to establish the allowable loads as per Appendix A of ASME Div I? Or are requests made only for specific reasons?
  15. Angsi

    Tubular Exchanger Design to Div II Requirements

    Can a Shell and Tube Heat Exchanger be designed to Div II requirements i.e. its tubes, tube-sheets, shell and flanges and U-2 stamped? Can someone please share the experience?
  16. Angsi

    Repair of Div II Vessels

    Heard that mods and repair on Div II vessels are difficult and it needs to be brought back to the original fabricator. Can someone please describe the requirements in general w.r.t to repair and mods to Div II vessels.
  17. Angsi

    Vessel Design Pressure in Excess of 3000 psi

    Code: Asme Section VIII Div 1 Location: Offshore Platform ============================= We have a gas-reinjection compressor outlet discharge pressure dictating the design pressure of vessels and tubular exchangers in excess of 3,000 psi limit stipulated in U-1(d). Code highlights that...
  18. Angsi

    Hardness and Impact Testing

    Ok, I understand hardness testing is not reaally a Code requirement, but is a measure of weld quality and is the industry (oil and gas) norm these days. Re charpy impact testing. I have also come across requirements where impact testing is required for some weld procedures (regardless of its...
  19. Angsi

    ASTM G48 Tests

    The duplex stainless vessels are to be operated at temperature well above 60 deg C on an offshore platform. As part of inspection and testing requirements during fabrication process, is testing to ASTM G48 necessary (due sensitization and emrittlement during welding process)? What should the...
  20. Angsi

    Solid CRA Nozzle Welded to CS Vessel

    Code: ASME Mat'l: Predominantly A516 Gr 70 + 3mm 316L Location: Offshore Platform ======================================================== Due to wet CO2 corrosion, most of the vessels require 316L internal cladding. The reservoir temperatures are high and in some cases up to 140 deg C. After...

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