UNITED FIRE SYSTEMS
STANDPIPE-
PAC™ MODEL SSS-101
DESIGN, INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
REVISION 2.00
P/N 10-540101-001
Page 4
2. DESIGN.
The specific
STANDPIPE-
PAC™
to use is chosen based on the internal volume of the standpipe to
be protected, and the desired fill time. See Table 1. Four (4) different units are available, based on compressor
size.
STANDPIPE-
PAC™ Part Number
Compressor Size, HP
SSS-101-16
1/6
SSS-101-13
1/3
SSS-101-12
1/2
SSS-101-34
3/4
2.1.
Determining Internal Volume of Standpipe.
See Table 2. The internal volume of the standpipe, in gallons,
is determined by multiplying the length of each pipe, by size, by the internal volume per foot, in gallons.
Nominal Pipe Size
Pipe Length in Feet
Gallons per Foot
Gallons
1-
1/2”
X
0.106
2”
X
0.174
2-
1/2”
X
0.248
3”
X
0.383
4”
X
0.660
6”
X
1.500
8”
X
2.600
Other
X
TOTAL =
2.2.
Determining Desired Fill Time.
Per Boston FD TCM3-51725, any impairment lasting 4 hours or more
requires shutdown of the construction / demolition site and notification to the Boston Fire Department. The
usual criterion is to fill / refill the standpipe in less than 4 hours, with margin for work performed for
construction / demolition. NOTE: The NFPA 13 sprinkler system rule
of 30 minutes “fast-fill” DOES NOT
apply to standpipes.
Table 1
– Available
STANDPIPE-
PAC™
Units
Table 2
– Determining Internal Volume of Standpipe
