Progressive Cavity Pump Metering System Demonstration

NETZSCH Operating Principle

netzch pump NM 031BY01 L06B ( stock )

1. 



Model : NM 031 BY 01L06B

SS Body and Rotating Parts

Sator : SBBPF

Shaft sealing : Single shaft seal MG1

c/w Nord Geared Motor 1.5 kw at 197 rpm

capacity : 1.5 m3/hr at 3 bar

stock avaialable 28/5/2011

Also
Model : NM 045 BY 06 B
Cast Iron Body . SS Rotor /Nitrile Stator
c/w 4 kw Gaeared Motor 280 rpm

Capaicty : 10 m3/hr at 6 Bar
 

Kiln Dryer ~thermal oil heating ~presure dropping as temperature increases

Site : BTenggrara

Pump Model : 65 x 40 -200
Duty : 25 m3/hr at 5 bar
Pump Speed : 2900 rpm
NPSH R : 2.0 Meter

Operating Pressure is 5 bar when temperature is below 150 C , but  temperature at 180 C and above
pressure drops to 2 bar
Cuase :
as temperature increase . the oil vapour pressure increase, as mentioned by customer oil
seem boiling at expansion tank

The drop in pressure is due to pump cavitating .when the vapour pressure increase
the suction head or NPSH avialable is reduced to a very low level ,possible below the
NPSH required of the pump.Thus the pump is cavitating and cavitation reduces the flow seriously

Solution
a) increase suction head  by raising the Inlet tank level
b) Increase suction line diameter ,to 100 mm from 65 mm ~this reduces the friction head
 check suction strainer for blockage
 c) upgrade pump , with pump operating on the left of the curve where the NPSH R is about 1 .0 Meter

The above rectification will help ,
Determine the Vapour pressure at 180 C . check with the Thermal Oil supplier and recalculate
the NPSH avaialable in the system

BASEPLATE -HAT PROFILE

CAVITATION DAMAGED -IMPELLER

Note the pitted condition of the impeller
this is caused by serious cavitation

External Gear Pump -Operating Principle

Rotary Vane Pump -Operating Principle

Internal Gear Pump -Operating Principle

operation of LOBE Pump

Operation of LOBE pump

INTERNAL GEAR PUMP

VISCOSITY TABLE

AIR ENTRAINED IN PUMPS

                                                                                          

OPEN & SEMI OPEN IMPELLERS FOR SLURRY PUMPS

SUMP PUMP IN OPERATION .SOLID SIZE 20 MM AND SOLID CONTENT 20 %

Add caption

Compared to sumbersible pumps, verticle sump pump present a more trouble free operation
Pump head is submerged and is without  mechanical seal ,thus no worry about dry running or seal damaged

Motor is on top , bearing failure can be easily detected . In submerisble pump, by the time you
notice the bearing failure , it is already too late
Motor burnt , seal damaged and costly repairs are needed
This sump pump is with semo open impeller
that allow soild passage of 40 mm

ENGINE COOLING PUMPS - JOHNSON FLEXIBLE IMPELLER PUMPS

VERTICLE SUMP PUMPS

Whether pump can be used for Unloading and Loading ?

Site : Palm Oil Refinery
Unloading : From Truck Tanker to Storage Tanks
Loading Or Despatch Pump : from Storage Tanks to Truck Tanker

In a typical Palm Oil Refinery  in Malaysia . the pumps are usually located about 3 to 5 meter
away from Trucks , and the storage tanks are located about 200 Meter or more away from ths pumping station

For unloading , normally no problem

If the same pumps are to be used for pumping from stoarge tank to the truck tanker ,with a
suction line of 200 M or more , problem such as cavitation will arise due to NPSH avialable being too low
Possibly when  the tank level is high ,the pump may still work depending on the NPSH condition
When the level gets low ,serious cavitation occurs and this cause high reduction in flow ,pump noisy
and pump life gets shorten

Should there be intention for the pumps to be used both ways , the piping system must be designed to
suit the purpose ,that is taking into account the NPSH available for flow in both directions