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  • Users: juancito
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  1. juancito

    Spiral Wound Gaskets, Material Certificates

    Dear all, For spiral wound gaskets with 304 stainless steel winding material, what sort of certificate has to provide the gasket supplier, just chemical composition or mechanical properties too? I read over and over the B16.20 and some catalogues from prestigious gasket manufactures and the...
  2. juancito

    ANSI B16.47 HEAT TREATING CONDITION

    Dear All, I thought that flanges #300 and over must be supplied in normalized condition. But I went through the norm and found nothing about this subject. May be I did not search properly. Can someone confirm if normalized is mandatory or not. Thank you in advance Juan
  3. juancito

    Slotted Holes Flanges

    Dear all, Does anyone know a reference where is stated that ASME flanges calculation is irrespective of the shape of bolt holes?. Thanks in advance
  4. juancito

    ANSI B16.5 Corrosion Allowance

    Dear all, I was sure that pressure ratings stablished in ANSI B16.5 implicitily included a 0.25in corrosion allowance and that if this values was exceded, the ratings were no longer valid. Just to verify that, I went thorugh this ANSI and found notihing about this corrosion matter (may be I was...
  5. juancito

    Joint Efficiency acc to UW-12

    Dear all, Please help me with the proper interpretation of table UW-12 for class (1) weldments. If a weldment is done only from one side, say with GTAW for the root and SMAW for completion, with comprobable full penetration, can E=1 be used in calculations?. Or this E=1 can only be used when...
  6. juancito

    Internal Painting of a L.P. Vessel

    Dear all, Does anyone know some source of information or tips regarding internal painting of pressure vessels. My main concer is about gaskets vs painting behaviour. Thanks in advance.
  7. juancito

    Coupling @ circunf. weld.

    Dear all, My mother lenguage is not english and that is probably (hope so!) the reason why me (and other colleagues) can`t fully understand UW-14 regarding the situation of a nozzle intersecting a cincunferential joint. Our real problem is: in a low pressure vertical vessel made from 12in pipe...
  8. juancito

    PVC Drilled tubesheet

    Dear all, although strictly speaking is not an Asme subject, it might be possible that some of you can help me up with the following issue: For a 64in sea water process vessel, I need to calculate a drilled plate (a tubesheet) made from PVC. Meanwhile in steel we use ultimate tensile strenght...
  9. juancito

    rubber+metal flat gaskets

    The gasket of this query consists of a metalic flat ring, say 2mm thick, fully surrounded by EPDM rubber in order to get a finnal thickness of 8mm. These kind of gasket, from what I know so far, are only fabricated in Germany. Does anyone know some gasket manufacturer in USA that can quote the...
  10. juancito

    ring flanges

    For a 56in OD pressure vessel, of 90 psi(g) as design pressure, we need to design a girth flange as cheap as possible, but of course in fully compliance with the Code. Besided a fully forged SA105 ring, we are analyzing several alternatives for the ring flange fabrication, about which I need to...
  11. juancito

    Gate Valves Leakage

    Dear all, During the pressure test of a piping system, 3 out of 20 3/4" #800 gate valves had a minor leakage,(according to customer inspector about 1 drop per minute). These valves were SW/NPT and the leak was detected once removed the sealing plug inserted in the threaded side of the...
  12. juancito

    Ansi Flanges Impact test

    Acc. to Div.1, flanges made acc. to ANSI B16.5 or B16.47, are exempt of impact test until -29°F. Questions are: a)If for venting purposes, a 1"NPT hole is drilled in one of these flanges, is it still a flange under B16.5 / B16.47, or this slight alteration means that impact test has now to...
  13. juancito

    Thickness Selections for MDMT calc. of a clamp

    Dear colleagues, Does any of you know where can I get some hints (or examples) concerning how to select "the" thickness of a not regular geometry like the clamp of a quick openning closure. Any comment on this regard will be very welcome. Thanks in advance JJ
  14. juancito

    Thickness selection for MDMT calc. of a clamp

    Dear colleagues, Does any of you know where can I get some hints (or examples) concerning how to select "the" thickness of a not regular geometry like the clamp of a quick openning closure. Any comment on this regard will be very welcome. Thanks in advance JJ
  15. juancito

    W.O.G. concept

    I was unable to find out from which code or norm is the definition W.O.G. (WATER.OIL.GAS) comming from. Does anyone know any source or web site to get that information? I´m trying to find some equivalence between for example W.O.G.1500 and the corresponding pressure rating OF ANSI B16.34 Thanks...
  16. juancito

    W.O.G. Definition

    Hi Guys! I was unable to find out from which code or norm is the definition W.O.G. (WATER.OIL.GAS) comming from. Does anyone know any source or web site to get that information? Thanks in advance
  17. juancito

    Fatigue Evaluation in nozzle to head junction

    Good morning colleagues, I did a rough fatigue evaluation vs.pressure cycles following Div.2 criteria. For stresses determination used the Stress Index Method. But I´m not convinced of my results. Is anyone familiar with this subject whom I can explained what I did and see whether I was right or...
  18. juancito

    High Pressure Small Vessel

    I´m going to design a small pressure vessel with a design pressure of 2600 psig. Any recommendation? Where can I get the MAWP of threaded couplings? Thanks in advance
  19. juancito

    Query on UW-11(a)(4)

    It regards with UW-11(a)(4) that deals with the exemption of Rx for the circunferencial butwelds between flanges and nozzle necks when: "neither exeed NPS10 nor 1.125in wall thickness". Because of lenguage, this sentence is somehow tricky for our understanding. Does it mean that a...
  20. juancito

    NACE Std MR0175-2002

    Does anyone have a "key guide" for the interpretation of this std?. May be because of lenguage, it´s getting tough for me to clearly see which are and arn´t the additional requirements to be fullfilled for the fabricacion of a P1 vessel material. Thanks in advance

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