Negative.   S40 is standard weight.  XS (extra strong) is S80 pipe.

John Hoffman P.E. | Fire Protection Engineer | Burns & McDonnell
Engineering | 2000 E. 95th St | Kansas City, MO  64131 | ph 816-997-7213

[email protected] wrote on 02/13/2009 01:40:29 PM:

>
> Back to NFPA 22 again today.  Section 13.1.15.2.2 states that "steel pipe
2"
> to 5" shall be extra-strong weight".
> I am assuming that this means at least schedule 40.  Is my assumption
> correct?
>
> Thanks,
>
> Bob Knight, CET
> (208) 318-3057
> [email protected]
> www.firebyknight.com
>
>
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