Service Contract No 2007 / 147-446 NYANYALI ... - Swaziland

4.1.1.1.2 Requirements for Fittings90º BendsThe radius (mm) of a 90º bend must be, at least, as shown in Figure 4rdFigure 4. Required radius of 90 bends (source: ARC (2007))r 2d100mm …………………………………... (2)Where: r = radius of bend (mm)d = inner diameter of suction pipe (mm).The suction manifold has two 300mm x 45° bends (figure 5) the radius of which could not bemeasured. According to figure 4 and equation 2 above, the required minimum for a 300mm x90° bend is 700mm but because the length of the suction pipe between this bend and thepump inlet manifold is more than five times the suction pipe diameter, the effects of theincorrect sizes are insignificant. The 200mm x 90° bend on the delivery main is alsoincorrectly dimensioned but have minimal effects on pump performance.Nyanyali Farmers Cooperative Report - 2009 Page - 11 -