Ampco Pumps Company LF 401, Инструкция по эксплуатации и техническому обслуживанию

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Sound piping practices
Suction and discharge piping must be prop-
erly supported and aligned with the pumps
suction and discharge ports.
Avoid throttling valves in the suction line of
the system.
Check valves must be at a minimum of 5
pipe diameters from the pump’s discharge.
Figure 43.
Keep the suction piping short and direct as
possible. Avoid elbows in the suction line
of the system. If this is unavoidable, locate
the elbow as least 5 pipe diameters away
from the pumps inlet and elbows should not
have a radii less than twice the diameter of
pipe. Figure 43.
Make sure that the NPSH available is al-
ways greater than the system’s NPSH re-
quired.
Avoid bending piping over obstacles as this
will cause the formation of an air pocket in
the suction line. Figure 44. Route piping
under any obstructions whenever possible.
Figure 45.
When using a reducer on the suction end
the reduced centerline should not be below
the suction centerline as in figure 46. The
centerline of the small diameter end of the
reducer should be above the centerline of
the suction line as in figure 47.
Injection line angles should be 45º or less.
Figure 48.
Figure 44
Figure 45
Figure 48
Figure 43
LF & LM SERIES PUMPS
Figure 47
Figure 46
Correct
Correct
Avoid
Avoid
Avoid
Correct