Page 122 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

PIPING

2.72 CHAPTER TWO

FIGURE 2.40 Typical structure attachments. (a) Insert; (b) beam clamp; (c) bracket.

it will support, which is determined by the area of the rod at the root of the thread. The
safe weight capable of being supported by different rod diameters is shown in Table 2.10.
Table 2.11 conforms to UL and FM requirements for minimum acceptable rod diameters
for various sizes supporting individual pipes. A rod diameter less than 3/8 in (12 mm) is not
recommended to be used as support for any pipe inside a facility.

TABLE 2.10 Load Rating of Threaded Rods
Nominal rod Root area Maximum safe load at
diameter, in of thread, in 2 rod temperature of 650°F, lb
1 0.027 240
/ 4
5 0.046 410
/ 16
3 0.068 610
/ 8
1 0.126 1,130
/ 2
5 0.202 1,810
/ 8
3 0.302 2,710
/ 4
7 0.419 3,770
/ 8

1 0.552 4,960
1 0.693 6,230
1 / 8
1
1 / 4 0.889 8,000
3 1.053 9,470
1 / 8
1
1 / 2 1.293 11,630
5 1.515 13,630
1 / 8
3
1 / 4 1.744 15,690
7 2.048 18,430
1 / 8

2 2.292 20,690
1 3.021 27,200
2 / 4
1
2 / 2 3.716 33,500
3 4.619 41,600
2 / 4

3 5.621 50,600
1 6.720 60,500
3 / 4
1
3 / 2 7.918 71,260

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