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ASME AG-1 Fluid Momentum Loads in HVAC duct

ASME AG-1 Fluid Momentum Loads in HVAC duct

I am currently working on an HVAC duct analysis for a nuclear waste treatment facility.  The duct is to be analyzed per ASME AG-1 which includes in some load combinations a "Fluid Momentum Load" or "FML".  ASME AG-1 Section AA-4211 define this as:
loads other than those listed here, such as the momentum and pressure forces due to fluid flow

and Section SA-4211 (c) this is as defined in AA-4211 with the following clarification:
Ductwork shall be designed to withstand FM loads resulting from air turbulence, often found in sections following fan discharges, with or without fan accessories, and certain dampers and duct fittings.  The termination of such sections is marked by the length of straight ductwork required to regain uniform ariflow as given by AMCA 201 Fig. 20:
and goes on to provide formualae for determining the straight length of duct.

So... are these loads calculated?

RE: ASME AG-1 Fluid Momentum Loads in HVAC duct

I think it's nothing more than Volume times Density times Velocity.

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