pipe hangers

huangyhg

pipe hangers
i have to design secondary members to support pipes and their hangers.  i stumbled upon the fact that there may be some special design consideration for the allowable stresses.  apparently, mss sp58 (manufacturers standardization society) requires 16.6 ksi maximum allowable bending stress when designing the secondary support members.
is this correct and are there other requirements that i should be aware of?
i do not have a copy of the publication mentioned above.  it is $95, and i do not know if it is worth buying.
any info will be helpful.  
thank you.
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unless you are actually designing the mechanical system there is no need to buy sp-58-2002 (pipe hangers and support materials, desing and manufacture). i would think that all the information you would need is available from the mechanical engineer or designer, including spacing of secondary support   
erv - the spacing of the secondary members is not of importance.  the information that i need deals with special design requirements for the members, regardless of the loads imposed on the   
andyfabian,
i don't know the parameters or the requirements for the specific design (e.g. seimic, loads imposed, etc.), so i can't give information. as far as i know this is not a requirement, however, if specified by the mech. eng., it should be followed. sp-58-2002 will have the information that can point you in the proper direction, so in that respect i recommend you obtain a copy.
andyfabian,
my understanding of mss sp-58 is that it establishes fabrication, design and inspection criteria for standard types of pipe hangers and components.  
it does have some guidelines for reduction criteria for stresses based on thermal (service temperatures) considerations for the hangers and components.
the first thing i thought of is thermal also, i have not used this code but it would seem that the stress shouldn't be set at 16.6. i would check to see if the allowable stress varies with the temperature that the hanger is expected to be subjected to.
there are pipe support elements, such as hanger rods and the clips that attach to the structural frame and the pipe.  these are within the scope of the mechanical, piping codes.  the structure these elements attach to are within the scope of the civil codes.  mss sp 58 deals with the pipe supports, such as hanger rods, spring supports, etc., not the structure to which they attach. mss sp 58 is a requirement only to the extent that it is referenced in the relevant piping code (e.g. b31.1, b31.3, etc.).  
cb4 - here is everything.  i have pipes hung with angles and rods that form trapezes.  the rods are supported by channels.  the channels are supported by the primary building steel beams, girders and concrete walls.
1. based on what you said, it is obvious that the primary   
the rods and angles forming the trapezes are pipe supporting elements governed by the piping code.
the channel to which the trapeze is attached is a structural support, governed by the structural code.
the piping code limits the allowable stres in pipe supporting elements to the piping code allowable stress.
if you really need and want consulting help after the prior explanations, you can provide contact info if you wish.
thanks for your help......what i need to be able to do now is simply determine what the allowable stresses are in the hanger supports based on the piping codes.
if it is not too many pages to bother you, and it isn't too cumbersome, could you please fax it to:  302-996-9537
thanks in advance!