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Recent content by Angsi

  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

    Thanks.
  5. 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...
  6. 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...
  7. 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...
  8. Angsi

    Hot Oil System Rating

    Thanks guys. Appreciated. Great article too.
  9. 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...
  10. Angsi

    U-Tube Exchanger

    pve5, The answers are: 1. Div I Year 2000 Edition 2. Tubesheet is CS + SS Overlay 3. Its a U-Tube bundle with a single pass partition plate on the channel side. Thanks.
  11. 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...
  12. Angsi

    10/13 Rule for Shell and Tube Heat Exchanger

    Thanks, it did.
  13. 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...
  14. Angsi

    PCHE

    You may be right, but depends upon which side of the exchanger we are looking at. It is quite like a rectangular block, with six sides. The nozzle headers take up two sides. In the past the vendor has supplied CRA (duplex/superduplex) shrouds welded on the exchnager to prevent exposure of the...
  15. Angsi

    PCHE

    No, it is not going to be painted. The PCHEs are constructed of many "thin" corrugated plates bonded/welded together. Think of it as a plate heat exchanger except that the heat transfer efficiency is much higher which allows the heat transfer area to be reduced, hence its compactness. The plate...
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