Page 7 - Silvercladd 08-10-2015

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5
Radius explained
The meaning of R: 33mm
R1.5
Radius (R) is always expressed as a (1.5 * 22mm)
measure of the pipe OD(1) or NB.
22mm
When R = 1 it means the radius of an
elbow is equal to the pipe OD. Like-
wise, if R = 1.5 it states that R is 1.5
of the OD.
R1 = Pipe OD
R1.5 = Pipe OD * 1.5
Following the above principles, one
would be able to determine the R by
using a square measuring tape, plac-
ing it on the welds of the elbow, then
comparing it to the pipe OD.
There are three important elements required when ordering elbows/bends (or fittings):
1. Pipe thickness;
2. Insulation thickness; and
3. Pipe middle-radius.(2)
Middle Radius
Insulation Thickness
Pipe Size (OD or NB)
(1) OD stands for Outside Diameter. NB stands for Nominal Bore - internal diameter of a pipe.
(2) Note: when we talk about Radius, we always talk about the pipe-radius, never about the insulation. Radius has never anything to do
with the insulation thickness. We also do not say ‘middle-radius’, but just ‘radius’ expecting that we are talking about the middle-radius.
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