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(Tolerance shall be cumulative) B For Piping Bends having a radius equal to SIX times the diameter or larger variations in the finished pipe caused by bending including any folds and bulges shall not exceed 3% x Nominal of the Pipe. The following conditions are requirements for use of the variations: The piping system shall not have pressure containing components of cast iron or other non-ductile metal. Inspect the Joint Fit-up like misalignment, cleaning, root gap, bevel angle through gauges & make acceptance as per approved WPS, drawing and ASME B31.3. Hoop stress 9.4 ksi is less than yield strength of 35 ksi. My Engineer advice me cut the dummy support 150mm which is suppose to be sit in the platform frame after cutting the grating as per design and welded in a pad for a fire water 250mm line .due to elevation difference of 25~ 40 mm they want don.t want to cut the grating rather than cut the horizontal dummy leg and weld it 25~40 mm below without shifting the pad or not weld addition pad. and adequate penetration and fusion can be obtained no special treatment is necessary. I found this board and Ifind It really useful & it helped me out much.I hope to give something back and help others like you aided me. (solution makestraight), fourth one , checkstructurealignment is correct or not. Normal Root Gap used is 2.4mm +/- 0.8mm and it depends on factors like Thickness, size of Filler wire used for root pass, welder's skill and no restriction as per ASME B 31.3. Bevel angle for steel as recommended below but may vary for Materials based on their thermal conductivity, ASME B31.3 normally references ASME B16.25 for bevels, https://groups.google.com/d/msgid/materials-welding/ae077930-a955-4a25-9297-e0cb3c3cd2dfn%40googlegroups.com. There is also less deviation from as installed dimensions during initial operation so that hangers will not be displaced as far from their original settings. W : Weld Joint Strength Reduction Factor. Regardless of the flange tolerance, the two connection points are not going to be set out accurately in the field. (a) Identification. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. can anyone solve that. (c) Flanged Joints. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Have an awesome day! The B31.3 Code contains requirements for piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants and terminals. Am i right in thinking ASME B31/3 allows heating of the carbon steel spools to adjust into positon after welding but not 316L (due to possible . Location of attachments etc, shall not exceed 3 mm. ID 2016 ISFT 293 Piping Stress Considerations and. Ans: Expansion stress range (SE) for a complex piping system is normally calculated using software like Caesar II, Start-Prof, Rohr-II, or AutoPIPE. By 803056 Date 05-17-2018 14:03 ASME construction codes do not provide instruction of the "how to" nature. fASME . Asme B31.8 Ed. ASME B31.3-1993Edition, Table 323.2.2, Minimum Temperatures Without Impact Testing for Carbon Steel Materials November 20, 1995 B31-95-018 Question: Does ASMEB31.3-1993Edition requireimpacttestingofASTMA 403 WP304W, B16.9 fittings manufactured from A 312 welded TP304 pipe without use ifweld metal deposits and used at r::. Heya im for the first time here. ASME B31.3 provides design, fabrication, erection, test, inspection, assembly, and material requirements for piping systems that carries following fluids: Packaged equipment piping design is also covered by the B31.3 code. 1) the equation provided for the sustain is bit different what i learned ( PD/4t+M/Z+F/A) ..but in your equation u havent consiederd longitunal stress but considered torsioanl stress.please clarify me? Amazing! Note that the pressure test provides such assurance for piping operating below the creep regime. Its value depends on component geometry. Now accept the available pipe thickness (based on next nearest higher pipe schedule) just higher than the calculated value from manufacturer standard thickness tables. Raw, intermediate, and finished chemicals. ASME B31.3 Process Piping Course 18. Please let us know here why this post is inappropriate. Oil and Natural Gas Production | Exploration (PDF). Thanks, Dear Anup, could you send me any example of the eq.16 for Formal Analysis Not Required? Login. 304.7.2. But pipe line in the rack is not straight. In order for a mating flange to work, they need to be, essentially, in contact. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Ans: When a branch connection is made in any parent pipe the pipe connection is weakened by the opening that is made in it. 335.1.1(c), prior to bolting up a flanged joint, may the flange faces be out of alignment from the design plane by more than 1/16 in./ft (0.5%), provided the misalignment is considered in the design of the flanged assembly and attached piping in accordance with para. Pressure design of piping systems is based on the design conditions. Fig. 302.3.1 (b) is the unical limit to shear consideration in B31.3The secondo thing I would like to ask you is if the meaning of the statement is that (having Fx and Fy shear component) Fx <= 0.8 Sh, Fy <= 0.8 Sh or if is the Resultant Shear force <= 0.8 Sh.In the first case I will have single values of shear Fx and Fy to be used as allowable max forces applicable related to shear. Question: In accordance with ASME B31.3c-1995 Addenda, para. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'whatispiping_com-banner-2','ezslot_2',851,'0','0'])};__ez_fad_position('div-gpt-ad-whatispiping_com-banner-2-0');report this ad, 11 Questions & Answers from ASME B31.3 that a Piping Stress Engineer must know. 328.5.5. beauty. Y=coefficient from code Table 304.1.1 Using the above formula calculates the pressure design thickness, t. highly toxic fluid such that a single exposure to a very small quantity of the fluid, caused by leakage, can produce serious irreversible harm to persons on breathing or bodily contact, even when prompt restorative measures are taken. Favg shall not exceed 0.67. I wanted to know what is the acceptance criteria for the straightness if the line pipe. As an alternative to the prior two paragraphs, if the variation is self-limiting, such as by accumulation during a pressure-relieving event, and lasts no more than 50 hours at any one time nor more than 500 hours per year, an allowable variation of 20% is permitted without the owner's approval and without requiring that the designer determine that the piping system is safe with the variations. Ans: Cold spring is the intentional initial deformation applied to a piping system during assembly to produce a desired initial displacement and stress. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. At elevated temperatures, when creep effects become . Also: If you get a response it's polite to respond to it. t m = t c + 12.50 % of the pipe thickness tm =tc/0.875 =6.52/0.875 = 7.45 mm (This is required thickness) Step 4. 111 0757670 0637653 bL7 IBI ASME B31.3 INTERPRETATIONS NO. For seamless pipe, the mill tolerance is 12.5% under tolerance. Thermal expansion and contraction effects due to resistance from free displacement or due to thermal gradients (thermal bowing effect) etc. For temperatures higher than 815C (1,500F), (100 Favg)% times the average stress for rupture at the end of 100000 h. Favg is determined from the slope, n, of the log time-to-rupture versus log stress plot at 100 000 h such that log Favg = 1/n. However, the same can be calculated using the following code equations: hereAp = cross-sectional area of pipeFa = range of axial forces due to displacement strains between any two conditions being evaluatedia = axial stress intensification factor. #Little_PEng, #ASMEB313Allowances #ASMEB313 #ASMEB313Training #ASMEB313Course. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. requirements of a supplemental nature, and does not abrogate the B31 codes in any way. If not above then as per your below mail "pipe line in the rack is not straight. Since calculated thickness is 8.118 is less than 25, ASME B31.3 eq. Cold spring is beneficial in that it serves to balance the magnitude of stress under initial and extreme displacement conditions. ASME B31.3 335.1(c)(1), Flanged joint alignment, Engineering Codes, Standards & Certifications, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. I simply want to give you a huge thumbs up for the excellentinformation you have got here on this post.I will be coming back to your site for more soon. I am a Mechanical Engineer turned into a Piping Engineer. The allowances for variations are relative to the maximum permissible. Attachment 2, ASME B31.3, "Process Piping" Acceptance Criteria Page 2 of 4 1.3 Progressive sampling for radiographic examination of welds shall be in accordance with Exhibit 1. Shane, with your explanation using spool pieces, I think I see now that this section of the code applies to piping where connections are made with flanges on the end of the pipe. Also every now and then it will say to refer to some other point of the code which will irritate you. A Throttling valve is a type of valve that can start, stop, and regulate the flow of fluid from one point to another. Supports, guides, and pointsof cold spring shall be checked to ensure that movementof the piping under all conditions ofstart up, operation,and shutdown will be accommodated without unduebinding or unanticipated constraint. This requirement is checked by calculating the required reinforcement area (A1) and available reinforcement area (A2+A3+A4) and if the available area is more than the required area then no reinforcement is required. Save my name and email in this browser for the next time I comment. If it was a 1 ft long spool piece the flange gasket faces cannot be misaligned more than 1/16". robinmech (Mechanical) (OP) 13 Jul 17 08:30 Hi XL83NL to in. I would like to ask you if the statement: Allowable stresses in shear shall be 0.8 times the basic allowables par. Wow, this paragraph is nice, my younger sister is analyzing these things,therefore I am going to let know her. press and 260 F des.temp. 304.1.1. 3. The construction is erecting pipe, doing fit-up, and welding. I suggest you to read the latest version of the ASME B 31.3 code. By joining you are opting in to receive e-mail. ASME B31.3 Appendix D, up to edition 2018 used to provide provides formulas to calculate the SIF values which is reproduced in the following figure.
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