One of the reactors developed a crack and was removed for repair. In
order to maintain production a temporary pipe was installed in its place.
Because the reactors were mounted on a sort of staircase, so that liquid
would overflow from one to another, this temporary pipe was not straight
but contained two bends (Figure 8.1). It was 20 inches diameter although
the short pipes which normally joined the reactors together were 28 inches
diameter. Calculation showed that 20 inches would be adequate for the
flow rates required. Bellows, also 28 inches diameter, were installed
between each reactor and these were left at each end of the temporary
pipe.