A totally different pressure rating.Įach of these codes make sense on their own but the differing uses of Class 30 is excessively confusing and I always get some very confused looks when I try to mention this to others. So a Class 3000 threaded fitting per MSS SP-97 is equivalent to a Sch 80 pipe minus thread allowance and corrosion. Again Clause 2.2 and 2.3 mention you need to remove wall thickness allowance for things like threading and corrosion. Table 1 of this code defines Class 3000, 6000, and 9000 threaded fittings (9000 added in 2019 code) to match Sch 80, 160, and XXS pipe respectively. So a Class 3000 threaded fitting per ASME B16.11 is equivalent to a Sch 160 pipe minus thread allowance and corrosion.īut then MSS SP-97, rather than referencing the ASME B16.11 system makes it's own. Then Clause 2.1.1 explains that you still need to reduce wall thickness by applicable allowance (e.g. Class 2000, 3000, and 6000 fittings have pressure rating matching Sch 80, 160, and XXS pipe respectively. ![]() There seems to be a giant misalignment that nobody talks about with threaded weld-on branch fittings (threadolets) per MSS SP-97 vs ASME B16.11's class system.įirst, for most threaded fittings covered by ASME B16.11, Table 7 provides the basis for how pressure ratings are determined. Looking to get clarity on something that has bothered me for years.
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