Page 6 - Silvercladd 08-10-2015
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  Elbows & Bends details

    Single-Fit Covers

       What is the right fitting? This depends on several factors. Theoretically, the best fitting is one that cre-
       ates no void gaps between the fitting and insulation; snug-fit. However, this may become impractical
       in the real world. Product availability, project urgency, man-power and geographical location are just
       a few examples of elements to consider when selecting the appropriate fittings.

       To understand the elbows/bends, the importance of radius must be firstly explained. Figure 1 displays
      the vital role that their radius plays. Three elbows/bends are constructed with different radiuses(1),
       however, having the same pipe and insulation size. The aim is to support the fact that each of these
       products require an individual cover.

       Figure 1

Multi-Fit Covers                                           Figure 2  R1  &  R1.5
                                                   Outer Radius           Inner Radius
There are situations where a multi-fit cover
may be desired, for example when a ‘live’
pipe cannot be stripped off to find any of
the sizes of PIR(2). In this case, only the final
OD can be measured(3) therefore a multi-fit
cover may be desirable.

A multi-fit cover takes the inner radius, of
the long radius (1.5R), and the outer radius
,of the short radius (1R), to accommodate
both alternatives (see Figure 2).

(1) A radius is “a straight line between the centre of a circle and any point on its outer edge; the length of this line” (Oxford Dictionary)
(2) PIR - abbreviation of Pipe, Insulation and Radius. Not to be confused with Polisocyanurate.

(3) Experienced contractors may be able to identify if the object has a long or short radius by looking at the throat and back of the elbow.
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