8.4.11.13 Piping Supports

Piping supports to restrain transverse motion shall be provided near changes in direction and particularly near valves and joints and shall comply with 8.4.2.3.

Horizontal spans shall be supported at intervals not to exceed those specified in Table 8.4.11.13.

 

Table 8.4.11.13 Pipe Support Spacing

Nominal Pipe Size, in.	Maximum Spacing Between Supports, mm (in.)
1.0	1 525 (60)
1.5	2 300 (90)
2.0	2 600 (102)
2.5	2 750 (108)
3.0	3 000 (120)
4.0	3 500 (138)

(a) Spacing is based on a natural frequency limit of 20 Hz. The pipe is presumed to have oil in it and, for an added margin of safety, the oil is assumed to weigh 900 kg/m³ (56 lb/ft³) at 15.6°C (60°F).

(b) Maximum combined bending and shear stress is limited to 71.8 kPa (1,500 psi).

(c) Maximum sag at the center of the span is limited to 2.5 mm (0.1 in.).

(d) For pipe sizes other than shown, the maximum spacing between supports shall be determined by the following formula:

(SI Units)

(Imperial Units)

where

E	=	modulus of elasticity for steel [2 068 × 106 MPa (30 × 106 psi)]
I	=	moment of inertia of the pipe, mm4 (in.4)
𝓁	=	maximum spacing between supports, m (ft)
W	=	weight per foot of pipe with oil at 15.6°C (60°F), kg/m (lb/ft)

0.192 = constant =