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Can I size every horizontal bracket support like a Pipe Stand Horizontal Support Arms?

Question asked by sti on Jul 3, 2018

From NFPA 13 - 9.1.1.2, We Know that Hangers shall de designed to support five times the weight of a water filled pipe plus 250lb (115kg) at each point of support.

 

But in 9.2.6.5.3 is specified that where a horizontal bracket is used to attach the system piping to the Pipe Stands, it shall be sized using a tabulated Section Modulus (Table 9.2.6.5.3) calculated using a maximum bending stress of 15ksi (103MPa)  and a concentreted load equal to the weight of 15ft (4,6m) of water filled pipe, plus 250lb (115kg).

 

My question is:

Can I size every horizontal bracket support, computing a Section Modulus using the Load of water filled pipe plus 250lb (115kg) and a maximum bending stress of 15ksi (103 MPa)?

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