Page 21 of Stainless Steel Tube Fittings by Lokring

® technol og y c or p or a t i on suggested allowable pressure table for stainless steel tube note for welded and drawn tubing a de-rating factor must be applied for weld integrity for double welded tubing multiply pressure rating by 0.85 for single welded tubing multiply pressure rating by 0.80 table 3 pressure ratings for 304 and 316 stainless steel tube seamless wall thickness measure in inches tube o d measured in inches 0.095 0.035 0.049 0.065 0.083 0.109 0.120 note all charts and tables are for reference only data gathered in these tables is based on formula s for 1/16 straight tube from asme b31.3 1/8 10900 3/16 7000 10200 1/4 5100 7500 10200 5/16 4000 5800 8000 applicable industry codes and 3/8 3300 4800 6500 practices should be considered 1/2 2600 3700 5100 6700 lokring technology corporation is not 5/8 2100 2900 4000 5200 6000 responsible for the accuracy of 3/4 1700 2400 3300 4200 4900 5800 information presented in these tables 7/8 2000 2800 3600 4200 4800 1 2400 3100 3600 4200 4700 all calculations are based on a 1-1/4 1900 2400 2800 3300 3600 maximum od and minimum wall 1-1/2 1600 2000 2300 2700 3000 thickness 2 1100 1500 1700 2000 2200 2-1/2 900 1200 1400 1600 1700 as an estimate these values can be multipled by .94 for working pressure table 4 temperature de-rating table for ss tube per ansi b31.1 code ºf ºc 304ss 316ss to determine allowable pressure at 200 93 1 1 no allowances have been made for higher temperatures multiply 400 204 0.93 0.96 corrosion or erosion 600 316 0.82 0.85 working pressure from table 3 by 800 427 0.76 0.79 the de-rating factor of the desired 1000 538 0.69 0.76 material and max working 1200 649 0.3 0.37 temperature from table 4 www.lokring.com copyright 2004 lokring technology corporation all rights reserved tube fitting pressure table and application guide 4.06 fs40-t 07-19-04

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