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  1. TWP

    Bolting class 12.9 at 350 °C design code AD-2000

    EN 10269 is well known in europe under EN 13480 (piping) and EN 13445 (pr. vessels). EN 1515 deals with bolting for flanges (Flanges and their joints — Bolting. 42crmo4 is part of a.m. EN standards. EN 1515 Part 1: Selection of bolting Part 2: Classification of bolt materials for steel flanges...
  2. TWP

    Bolting class 12.9 at 350 °C design code AD-2000

    Read the German standard called "AD 2000 Merkblatt W7" (materials for pressure vessels, Bolts and nuts made from ferritic steels); 2014-11 There are a lot of limitations in this standards. Lower temp. limit for 8.8 and 5.6 not below -10C. Pressure also limited. Grade 12.9 seems not to be...
  3. TWP

    Main pressure-bearing parts PED 97/23/EC

    Read the published official PED guidelines. http://ec.europa.eu/enterprise/sectors/pressure-and-gas/documents/ped/guidelines/index_en.htm For bolting >> Guideline 7/8 Guideline related to: Annex 1, section 4 Question: What are the certificates required for bolting parts? Answer: The...
  4. TWP

    Change in Mechanical Integrity of a flange after adding holes

    Extra on holes 8 mm is no problem at all; relatively small and influence is only local. Locally (near 8 mm holes) somewhat higher stresses. Not very important and OK if local. In general, all flange ring stresses at bolt circle dia. are relatively low. All in all more a theoretical problem than...
  5. TWP

    A105 Lap joint flange limitations

    Follow the rules of ASME B31.3. Use Table A-1 for all individual pipe & flange components, incl. bolting. Gasket mat'l also to be checked.A105 is surely not suitable. Consult also ASME B31.3, Appendix L. Regards. Th Pl
  6. TWP

    Determing the H2S threshold for NACE Piping

    NACE is just an organization, not a material. Most likely you intend to select materials for sour service. In that case the Oil & Gas industry dictates that materials shall be selected per ISO 15156 (3 parts in total). Search this form on sour service or H2S or ISO 15156.
  7. TWP

    RF verses RTJ

    Dear sir, I'm designing piping systems for 30+ years and did also design all kinds of vessels for the Oil&Gas business. I would always go for spiral wound gaskets (unless customers dictate the use of RTJ's). SPW's from reputable SPW manufacturers are very reliable and have been used up to 350...
  8. TWP

    NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

    I did run (ASME-based)flange design calculations for NPS 14-Class 1500 RTJ WN flanges in order to determine MAWP and suitability for rating higher than Class 1500. Loading considered is internal pressure. No external forces/ moments taken into account. Details available upon request.
  9. TWP

    DUPLEX COLD BENDING

    piping under internal pressure has to be designed per piping design code. pipe design to comply with all design code requirements incl fabrication (incl bending). So, in first instance you must comply with piping design code bending requirements. Rather severe for S31803. In addition to this...
  10. TWP

    Flange do not required de-rating upto 120C as per B31.3

    Dear spoonful I work with a lot of american standards/ codes and standards/ codes in Europe. Also used AS's to some extent (AS 1210). No idea where 120 C is coming from. Perhaps from a standard valid in the good old days. But I'm already as well (nearly 62). So, no idea, sorry. Certain local...
  11. TWP

    API 5LB for low temperature

    this requires separate design calculations/ design evaluation per ASME B31.3 I have developed design software and could assist send me an e-mail with all relevant details if you like
  12. TWP

    Flange do not required de-rating upto 120C as per B31.3

    I have used all of the mentioned ASME standards for more than 30 years now and I have never encountered a similar statement on ratings in the references ASME's.
  13. TWP

    Hardness of Carbon Steel Ring Joint Gaskets

    You should'nt use A105. This material has a hardness of approx. 140 HB or higher. Doesn't meet the max. allow. hardness of 120 HB for the Low carbon Steel. Hardness of ring joints shall be eesentially lower than mating flanges. Difference at least 25 HB! (advise/ for proper functioning/...
  14. TWP

    900# Weld neck flange design

    Since 20 years we apply mainly ASTM A182-F51 (UNS S31803); similar to type 2205 (Sandvik). This is the most common Duplex St Steel type in the Oil & Gas industry for moderate applications. UNS S31803 material is ASME listed but not yet in all product shapes. We fabricate piping systems with this...
  15. TWP

    900# Weld neck flange design

    only small WN/ hubbed flgs may be machined from bar; to my memory limited to 4" OD (bar OD); dicated by ASME piping code B31.3, ASME press vessel code (ASME VIII-1, App 2) and ASTM product spec's for flanges such as A182 + therein referenced ASTM's; see also ASME B16.5. So, hubbed flgs not to...
  16. TWP

    Heater tube materials SA-249 vs SA-269

    A269 is used for a.o. instrument piping ; design as per ASME B31.3 piping code A269 doesn't require tensile testing; ASME B31.3 code requires separate tensile testing per A249 A 249 is not a listed spec. under ASME B31.3 piping code A249 is connected with ASME Boiler & Pressure vessel codes...
  17. TWP

    Use of Lubricant on Octagonal Ring Joint Gaskets

    Do not lubricate gaskets (general rule) Exception : metallic RTJ gaskets for RTJ flanges. These may be lightly (!) oiled to reduce very high frictional forces (important !). Regards, TP
  18. TWP

    API 5L SAW / GMAW pipes - longitudinal weld joint quality factor

    There is no evidence in the ASME B31.3 that additional radiography increases factor Ej from 0,95 to 1,00 as far as I know. Regards, ThPl
  19. TWP

    ASME B31.3 Code Compliant Flange Bolting

    thermmech, would you pls explain your last sentence. thanks in advance. TP
  20. TWP

    BX RTJ

    Thanks Gasketguru. My company got an official copy of Paper 63-PET-3 from Linda Hall lib. That's what I wanted you to know. Unfortunately we could'nt get a copy of Paper 57-PET-23. Perhaps you know where to obtain a copy of this paper??? On basis of Paper 63-PET-3 and the conventional Taylor...

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