ปั๊มหอยโข่ง EBARA ชนิดหน้าแปลน รุ่น 3D Series (4 Poles) : EBARA

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ปั๊มหอยโข่ง EBARA ชนิดหน้าแปลน รุ่น 3D Series (4 Poles) : EBARA

PERFORMANCE CURVE SPECIFICATIONS
The specifications below qualify the curves shown on the following pages.
Tolerances according to ISO 9906:2012 – Grade 3B
The curves refer to effective speed of asynchronous motors at 50 Hz, 4 poles.
Measurements were carried out with clean water at 20°C of temperature and with a kinematic viscosity
of  = 1 mm2
/s (1 cSt)
The NPSH curve is an average curve obtained in the same conditions of performance curves.
The continuous curves indicate the recommended working range. The dotted curve is only a guide.
In order to avoid the risk of over-heating, the pumps should not be used at a flow rate below 10% of best
efficiency point.
Symbols explanation:
Q = volume flow rate
H = total head
P2 = pump power input (shaft power)
 = pump efficiency
NPSH = net positive suction head required by the pump
MEI = minimum efficiency index

ปั๊มหอยโข่ง EBARA ชนิดหน้าแปลน รุ่น 3D Series (4 Poles) : EBARA

MEI INDEX SPECIFICATION
The minimun efficiency index (MEI) is a measure of the quality of a pump size in respect to its mean efficiency.
The minimum efficiency index is based on the hydraulic efficiency and on the head at the best efficiency point.
The efficiency of a pump with trimmed impeller is usually lower than that of a pump with the full impeller diameter.
The trimming of the impeller will adapt the pump to a fixed duty point,leading to a reduced energy consumption.
The minimum efficiency index (MEI) is based on the full impeller diameter.
The operation of these water pumps with variabile duty points may be more efficient end economical when
controlled,for example,by the use of a variable speed drive that matches the pump duty to the system.