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  1. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Hello IdanPV If you look for companies with the E Stamp in Europe, you will find practically none (Germany, Spain, France and Italy do not have any). In the USA, only three. Manufacturers with the S or M stamp are aimed at fired boilers; They are not used to manufacturing austenitic stainless...
  2. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Hello G2, thanks for your opinion. The boiler's submerged electrical resistances have a total of 9 kW, MAWP is 6 barg, design temperature 175ºC, steam production approx. 12 kg/h. The size of the pipe will possibly be 1/2" (and there is still more!). The length of the pipe will be really short...
  3. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Hi IdanPV What about the piping? The boiler is intended for hospital or pharmaceutical purposes. For boiler external piping that will apply ASME B31.3. In any case, it will be piping of very small size (<=1") and length (approximately 1.5 m). Pressure Relief Valve?: UG-150(c) & (d) Hydrostatic...
  4. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Hello again IdanPV. I thank you very much for your opinions. In your last post, you exclusively use references from ASME I, to reach the conclusion that this Section should be used to manufacture the completed boiler. We already agreed on this in previous posts. However, if from the beginning...
  5. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Thank you very much IdanPV. Starting with ASME I, I also come to the conclusion that you present. But, if we go directly to ASME VIII-1, U-1(g)(1), where it says "Unfired steam boilers shall be constructed in accordance with the rules of Section I or this Division [see UG-120(f), UG-150(d), and...
  6. Josep Maria Perdigo

    Electric boiler according to ASME VIII-1

    Can there be a very small completed electric boiler stamped only with U-stamp and the letters UB (special service), that is, without the E-stamp (ASME I)?
  7. Josep Maria Perdigo

    Fig UG-34 sketch(b-2): Welding a forged flat head to shell, without doing Tension Test Specimen

    I already considered this possibility, but I interpreted that "upsetting and spinning the end of the shell" results in a vessel in which the shell and head are a single piece, without welding (such as gas cylinders), and not is my case.
  8. Josep Maria Perdigo

    Fig UG-34 sketch(b-2): Welding a forged flat head to shell, without doing Tension Test Specimen

    Cobra17, SnTMan, thank you very much for your information and insightful comments. I understand that my position is difficult to maintain. I saw that, at first glance, there is a lot of difference between my design and Fig UW-13.3, hence my query. But as you say, the difference is not relevant...
  9. Josep Maria Perdigo

    Fig UG-34 sketch(b-2): Welding a forged flat head to shell, without doing Tension Test Specimen

    Dear colleagues I have designed a forged flat head according to fig. UG-34 sketch (b-2) / UG-34(d)(3). The length of flange is quite large, so that the flange-shell weld is away from the corner (radius r) and from the hub (tapered zone). See attached figure, with dimensions. The question I...
  10. Josep Maria Perdigo

    Flat head UG-34(d)(1), (2) or (3): forge vs cold formed

    Dear colleagues: Flat heads according to UG-34 (d) (1), (2) and (3) shall be “forged”. Here “forged” means a forming process that implies heating, or else, the flat head may be produced by cold forming according to UG-79?
  11. Josep Maria Perdigo

    Application temperature limits of SS 904L

    Thanks metengr and EdStainless. To complete the normative panorama, one more data: "EN 10216-5 Seamless steel tubes for pressure purposes" establishes a limit for intergranular corrosion of 400ºC for 1.4539, which is the European equivalent of 904L. Summarizing: ASME VIII-1, vessels: 371°C ASME...
  12. Josep Maria Perdigo

    Application temperature limits of SS 904L

    Dear forum members, I was surprised that the SA-312 grade 904L pipe has an application limit of 371°C (700°F) for ASME VIII-1, while in ASME B31.3 the limit drops to 260°C (500°F). Does anyone know the reason for this big difference?
  13. Josep Maria Perdigo

    EN 13445-3, 17: Simplified fatigue assesment

    I am referring to the Spanish version: - 17.6.2.3, second paragraph, mentions Table 17-3. - Table 17-2, it is certainly not mentioned, and although the factors C1 and C2 are no longer necessary, but the values Δσ and Δσcut are still necessary to use the formulas of 17.6.6. In addition, in...
  14. Josep Maria Perdigo

    EN 13445-3, 17: Simplified fatigue assesment

    In EN 13445-3: 2014 tables 17-2 and 17.3 are missing. I think this is an editing erratum. I will continue to use the tables of EN 13445-3: 2009.
  15. Josep Maria Perdigo

    RePad in two pieces

    In the framework of ASME VIII-1, can I make a RePad in two pieces? (See attached figure) The welds between the two parts would be butt. There would be a ventilation hole in each part. Can the longitudinal welds be considered as category A and the circumferential category B as per Fig UW-3...
  16. Josep Maria Perdigo

    AD 2000 Merkblatter HP2/1

    Excuse me, I see now that EN 910 was replaced by EN ISO 5173: 2011. In any case, I understand that the definition of "a" remains the same
  17. Josep Maria Perdigo

    AD 2000 Merkblatter HP2/1

    You refer to bend test according to EN 910. In that standard "a" is the thickness of the test specimen
  18. Josep Maria Perdigo

    Fillet Welded TTS joint in AD Merkblatter

    In case of fillet weld I would use the throat thickness, ie = g = 0.7 * fillet weld leg But, AD Merk does not take into account the effect of the various thermal expansions of the shell, the tubes and the plate itself. If you want a better analysis you can refer to EN 13445-3, 13 or ASME VIII-1...
  19. Josep Maria Perdigo

    Boiler room

    The Spanish regulation of boilers (RD 2060/2008 ITC EP-1) establishes that the boiler room must have reinforced concrete walls of 20 cm thickness. Doors can not exceed 1.2 x 2.1 m. The roof has to be of light material. The objective is to protect the people outside the room, in case of boiler...
  20. Josep Maria Perdigo

    Mandatory Appendix 14 - head with a large central opening

    Since the allowable stress is that of Ap 2-8, I understand that the criteria for how materials can be used and welded must be those of Ap 2-2. E-efficiency is not used in 2-8.

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