Craig,
Are you sure about the importance factor (Ip) being 1.0? In most of the
work I've seen regarding fire sprinkler systems that value is 1.5.
Also, what does the latest edition of NFPA-15 say? I'm just jumping to
the conclusion of course that it's a fixed waterspray system.
Interesting to be sure.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
[EMAIL PROTECTED] wrote:
I have a tank farm with deluge sprinkler protection on the vessels,
steel pipe rack and supporting steel. The debate that has arisen is
whether this type of arrangement really needs to be seismically braced.
The issue is that it is not a structure, and not occupied. However the
materials within the tanks are flammable/combustible.
Now to what degree of seismic resistance the structural steel and tank
supports are designed to is unknown.
Is there an exemption for this type of installation? Based on the
information provided by structural, the occupied buildings would be
braced, no question there. But for exterior vessels, that is the
question.
Soil Site Class = D
Occ. Class. = I
Seis. Des. Cat. = D
Structure Ip = 1.0 but might be argued to be 1.25 (Occ. Class II)
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.ch2m.com
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