Although code doesn't talks about it explicitly but I believe that code has no intention to apply circumferential weld joint strength reduction factor to girth welds since no value is provided in the code. As per 2010 edition of ASME 31.3 weld strength reduction factor (W) shall be applied to circumferential welds at elevated temperature. Calculate the pipe weld joint reduction factor W from the maximum temperature (ASME B31.1 table 102.4.7). Re: [MW:29293] ASME B 31.3-Weld Joint strength reduction factor "W" for seamless pipe ? The weld joint of welded steel pipe is the weak link, and the weld quality is also the main factor affecting its overall performance. d o = pipe outside diameter, inches. 2.3.4 Complete Joint Penetration Groove Welds 2.3.4.1 Weld Size. The example shows that the actual pipe wall thickness is approximately 25% more than the required thickness. F = design factor E = longitudinal weld joint factor (see ANSI B31.3); = 1.00 for seamless, electric resistance weld, flash weld = 0.80 for furnace lap and electric fusion welded pipe = 0.60 for furnace butt-welded pipe. Weld Joint Strength Reduction Factor (AS4041 Table 3.12.5) W Design Temperature, °C Required Wall Thickness (including allowances), mm ASME B31.3 PROCESS PIPING - ALLOWABLE DESIGN PRESSURE Ej Weld Joint Quality Factor (ASME B31.3 Table 302.3.4) Material Allowable Stress, MPa (ASME B31.3 Table A-1M) S Coefficient Y (ASME B31.3 Table 304.1.1) Y c The pipe outside diameter (D) can be found in this document: NPS nominal pipe size. ASTM A53 Grade A, B Seamless and Welded Pipes Manufacturers & Suppliers. W : Weld Joint Strength Reduction Factor. For other materials, the weld joint reduction factor is interpolated from table 102.4.7. An on-line literature search and discussion with long-time members of ASME piping They apply to longitudinal and spiral weld joints in pressure design and to circumferential weld joints in the evaluation of stresses due to standard loads, S L. Pipe for Socket weld Systems: Pipe intended for socket welding shall be square cut. 104 Pressure Design Of Components. For carbon steel the weld joint reduction factor is 1.0. @article{osti_136770, title = {Fatigue strength of socket welded pipe joint}, author = {Higuchi, Makoto and Hayashi, Makoto and Yamauchi, Takayoshi and Iida, Kunihiro and Sato, Masanobu}, abstractNote = {Fully reversed four point bending fatigue tests were carried out on small diameter socket welded joints made of carbon steels. Weld metal, base metal and cross-weld creep rupture data had been used to develop weld joint strength reduction factors in … Applicable as per ASME B31.3 Table A-1A or A-1B . There are many factors that may affect the life of a welded joint at elevated ... of weld strength reduction factors. A new row for Carbon Steel was added in Table 302.3.5, “Weld Joint Strength Reduction Factor… Weld joint strength reduction factor, W, was included as an allowance for pressure and temperature variations. No increase in the effective area for design calculations is permitted for weld reinforcement. Table A-1B Basic Quality Factors for Longitudinal Weld Joints in Pipes and Tubes - Table 304.1.1 Values of Coefficient Y for t < D/6 - Table 302.3.5 Weld Joint Strength Reduction Factor, W - ASME B36.10M-Welded and Seamless Wrought Steel Pipe - ASME B36.19M-Stainless Steel Pipe - Fatigue-strength-reduction factors (FSRFs) are used in the design of pressure vessels and piping subjected to cyclic loading. For seamless piping the weld quality factor (joint efficiency) may be taken as 1.0. 2.3.11 Weld joint strength reduction factors. Weld strength reduction factors (WSRFs) based on the weld metal, and weld joint have been evaluated, and compared with the codes. Subject: ASME B31.3-2006, Tables 302.3.4 and A-lB, Longitudinal Weld Joints in Pipes, Tubes, and Fittings Date Issued: April 30, 2008 File: 08-480 Question (1): Does the Code permit an EFW pipe produced without filler metal to be upgraded to a weld joint quality factor of 1.00 through radiography? 104.1 Straight Pipe . The minimum required thickness, t m, of a bend equations now includes the weld strength reduction factor, W. Which is 1 for seamless pipe or seam-welded pipe operating below the creep range or areas of the bend that doesn’t contain a weld. T = Temperature derating factor The places where the explosions are usually welded. The weld joint reduction factor may be taken as 1.0 for cases where the temperature is less than 500°C. welded seams, from 1940 and later, should be considered to be of equivalent strength as a seamless bend or seamless pipe of matching size and material. Joint efficiency is concept found in several API and ASME codes. This paper reviews the background and basis of FSRFs that are used in the ASME Boiler and Pressure Vessel Code, focusing on weld joints in … The Joint Efficiency Factor, E, represents a generic level of confidence in the overall strength of a weld seam considering the method used to produce the seam, the thoroughness of inspection of the seam’s quality, and testing of the seam strength. Table 302.3.5 Weld Joint Strength Reduction Factor, W - ASME B36.10M-Welded and Seamless Wrought Steel Pipe - ASME B36.19M-Stainless Steel Pipe - Mill Tolerance = 12.5% Equations for Wall thickness calculation of straight pipes under internal pressure (304.1): Poor weld root profile, which was indicated by a large step between the surfaces of the weld root bead and the adjacent pipe, created a high stress concentration. If you are interested in purchasing high quality ASTM A53 Grade A or Grade B black and hot-dipped, zinc-coated, welded and seamless steel pipe, please contact us now for more detailed information. Applicable as per Para 302.3.5(e) of ASME B31.3; It is applicable only for Welded pipes. 0.85 for Electric Resistance Welded Pipes. Pipe Joints: Seamless Pipes: Seamless pipe has an Eff of 1.0, a longitudinal seam drops that value to numbers like your 0.85. Reply (1): Yes; see Table 302.3.4. Read about START-PROF pipe stress analysis software. E : Longitudinal Weld Joint Quality factor. For other materials, the weld joint reduction factor is calcuated from a straight line equation for table 302.3.5 (the table values are truncated to two decimal places). Weld Joint Strength Factor Weld joint strength reduction factor W (302.3.5) ¾Used to account for the long-term (creep) strength of welds that may be lower than the base material ¾In the absence of more applicable data, W shall be 1.00 for all materials 950ºF (510ºC) and below 0.50 for all materials at … A lower Eff gives a thicker wall. This confuses me again. If you do full radiography of the joint, Eff can get back up to 1.0. Calculate the pipe weld joint reduction factor W from the maximum temperature (ASME B31.3 table 302.3.5). People who have lived in the north generally have experienced the experience of freezing water pipes or heating pipes in the winter. good quality piping. Welded joint efficiency table recommendations. For all other materials, the selection of pipe wall thickness is based on allowable internal pressure calculations for seamless pipe … 1.0 = 100%, 0.85 = 85% efficiency. . Lengths: Pipe shall be supplied in double random lengths. WSRFs for the weld joint were higher than … Joint efficiency is a factor required in all head and shell calculations that accounts for how closely a finished weld joint approximates the quality of the seamless parent material. All weld safety factors are set according to standards and can be selected automatically be clicking. Weld Safety Factors. - The tensile strength of the weld electrode can be 60, 70, 80, 90, 100, 110, or 120 ksi. If the ultimate shear strength of the weld = fw Rn = fw ×0.707 ×a ×Lw φ Rn = 0.75×fw ×0.707 ×a ×Lw i.e., φ factor = 0.75 fw = shear strength of the weld metal is a function of the electrode used in the SMAW process. B31.3-2008, for straight pipe under internal pressure, Section 304.1.2 - Equation (3a), now includes a WELD STRENGTH REDUCTION FACTOR "W", which is used because at eleveated temperatures, the long-term strength of weld joints can can lower than the long-term strength … 0.60 for Furnace Butt Welded Pipes. Without further inspection it is assumed the welded joint is weaker than the material around it due to potential defects such as porosity, slag inclusions, and others. Butt-welding Ends: Butt welding ends shall be in accordance with the requirements of ASME B16.25. The weld joint strength reduction factors added in the 2004 edition were based on those provided in ASME BPVC Section IH, Subsection NH. Hence under such case factor W in accordance with table 302.3.5 shall be multiplied to SE for seamless pipes also in pipe thickness calculation. Hence the presence of the seam does not affect the maximum allowable operating pressure of L ongitudinal Weld Joint Efficiency Factor, E. Weld Safety Factor for Pressure (longitudinal), Wl. Joint efficiency is concept found in several API and ASME codes. ASME B31.3 Table A-1 Basic Allowable Stress ( S ) ASME B31.3 Table A-1B joint quality factor ( E ) The weld strength reduction factor (W) in ASME B31.3 has a value between 0.0 and 1.0 that is determined by the material and the design temperature. The weld size of a complete joint penetration groove weld shall be the thickness of the thinner part joined. 104.1.1 Straight Pipe Under Internal Pressure Galvanizing: Galvanizing shall be applied in accordance with ASTM A53. Weld joint strength reduction factors apply at temperatures above 950 °F (510 °C) and are based on consideration of the effects of creep. Weld Safety Factor for Bending (circumferential), Wc. 1 For Seamless Pipes. Table 302.3.5 Weld Joint Strength Reduction Factor, W is applicable only to longitudinal joints. Weld Joints and their general efficiency (recommendation, consult ASME pressure vessel code or similar application standards when required). Weld joint efficiency (Eff) reflects the certainty of burst strength. For carbon steel the weld joint reduction factor is 1.0. For API 5L Grade B, a distinction has been made between seamless pipe and welded pipe with a weld joint factor E=0.95 (in accordance with ANSI/ASME B31.3, Table 302.4). S = minimum yield strength of pipe, psi. In the present girth welds the step was equivalent to the hi-lo, the step between the pipe surfaces either side of the weld, because of the very flat weld root bead, as indicated in Figure 2. The Joint Efficiency Factor for the seams should be taken as having a value equal to 1.00. See how Eff (E) is used in the wall thickness calculation. Applying this definition to a welding joint yields that the FSRF for a given weld, material, component geometry and 3200 of ASME III [1], the fatigue strength reduction factor (FSRF) is a stress intensification factor which accounts for the effect of a local structural discontinuity (stress concentration) on the fatigue strength.