V. 90°elbow is not allowed to be used directly at the outside of pump suction port, see
“figure A.3.3.1.5”, in this case, cavitation will occur during the operation of the fire
pump to damage the pump;
FIGURE A.3.3.1.5
VI. The pipe connected to the suction inlet of the fire pump must be a straight pipe, the
length of which should be 10 times the diameter of the suction pipe;
“figure A.3.3.1.6” is
wrong, which shows
that the length of the
straight pipe is less
than 10 times of the
pipe diameter.
FIGURE A.3.3.1.6
10 times of the
pipe diameter
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