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API 676 External Loads

API 676 External Loads

API 676 External Loads

(OP)
I am doing preliminary stress work on some PD pumps which will be purchased at a later date.  At this point the vendor is not determined.   They will be purchased to API 676.  In looking at API 676 there are nozzle loads provided but I can not make any sense out of them.  They are as follows

2.4 External Forces and Moments
For pumps with steel or alloy-steel casings, inlet and outlet
nonles shall be capable of withstanding forces and moments
from external piping determined by the following
formulas (see Figure I):
F, = 13D Mx = 7D
F = 13D M = 7D
F, = 13D M, = 7D
or in conventional units
F, = 75D Mx = 125D
F = 75D My = 125D
F, = 75D M, = 125D
Y
Where:
D = nominal pipe size of the pump nozzle connection in
millimeters (inches).
F, = force in Newtons (pounds) on the x-axis, which is
parallel to the shaft axis.
F = horizontal force in Newtons (pounds) on the y-axis,
which is mutually perpendicular to the x- and z-axis.
F, = vertical force in Newtons (pounds) on the z-axis,
which is mutually perpendicular to the y- and x-axes.
Mx = moments around the x-axis. in Newton-meters
(pound-feet).
M - moments around the y-axis, in Newton-meters
(pound-feet).
M, = moments around the z-axis, in Newton-meters


Base on the units given this does not make sense 1 lb = 4.4N and 1 ftlb = 1.35 Nm  so based on the above formulas the nozzle loads would be different depending on what units I use.

Does anyone have any experience in working with this standard that can explain how the allowable nozzle loads are properly calculated?

RE: API 676 External Loads

(OP)
Nevermind I am an idiot.  It all works out.

I was multiplying 13*8 for 8 inch pipe instead of 13*200
 

RE: API 676 External Loads



D        N        Nm
400    13    5200    5    2000

        lbs        Nm
16    75    1200    125    2000
 

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: API 676 External Loads

Whoops too late.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

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