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# ASCE 7-02 WIND ON PIPING

## ASCE 7-02 WIND ON PIPING

(OP)
I wish to know how to calculate wind gust factor for piping.
All data in ASCE are for buildings, but not for piping.
Many thank for any informations.

### RE: ASCE 7-02 WIND ON PIPING

edemarcos,

Refer to the ASCE Publication:  Wind Loads and Anchor Bolt Design for Petrochemical Facilities.  This publication is dated 1997 and references ASCE 7-95 (the first one to use the 3-second gust as a basis).  In Appendix 5.A. is an example of wind loads on a pipe rack with pipes and cable trays on it.

For the pipes, they use G = 0.85 and Cf = 0.7.  They recommend using an effective area for the pipe as follows:

Ae = Largest pipe diameter + 10% of rack width  (per foot of pipe rack length).

regards,

chichuck

### RE: ASCE 7-02 WIND ON PIPING

(OP)
This value for G is valid for ASCE 7-02 also ?

### RE: ASCE 7-02 WIND ON PIPING

edemarcos,

Yes, the gust factor is also applicable to the 7-02 code.  In the newer code, the proscriptive value of 0.85 is applicable to all exposures, not just to exposure C as was true for the 95 code.  There were some changes between the two codes as regards gust factor, (ref. section 6.5.8 in 7-02 and  section 6.6 of 7-95), but the proscriptive value is still valid.

Regards,

chichuck

### RE: ASCE 7-02 WIND ON PIPING

edemarcos/chichuck,

Regards

DSB123

### RE: ASCE 7-02 WIND ON PIPING

We use the following formula for pipe racks, based on equating a pipe group to a single equivalent pipe.  Unfortunately I'm not sure of the original source/reference.

Fw = Cd*p*(dmax + dave*a)

where:
'Fw' is the unit wind load [kN/m]
'Cd' is the drag coefficient for the largest pipe in the group
'p' is the wind pressure [kPa]
'dmax' is the largest diamter in the pipe group [m]
'dave' is the average diamter of the pipe group [m]
'a' is a factor for the number of pipes in the group
1 pipe, a = 0; 2, 0.70; 3, 1.19; 4, 1.53; 5, 1.77; 6, 1.94; 7, 2.06; 8, 2.14; 9, 2.20; 10, 2.24; >10, 2.30

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