Recent content by Minghan

My sample is a nickel-based alloy The specification is A494/A494M Specification for Castings, Nickel and Nickel Alloy I found this http://209.195.157.233/EDIT/html_historical.cgi?A781/A781M+12a It said that 5.3 Product Analysis—A product analysis may be made by the purchaser from material...

Is there any regulation about chemical composition about stainless steel which is made from recycling scraps ? Like the percentage of impurity substance such as W , V and etc should not exceed the limit values.

I ask the foundry to cast nickel alloys and I took a piece metal to do a chemical test. The element composition of the nickel alloy is Ni 70% Cr 12% Fe 1.2% Mo 2.5%...so far they all are in the allowable range. But I found the alloy also contains W 0.004% ! Is this the normal condition ? ? I...

Want to know how to get the actual power the pump needs. I can measure the flow rate by the flow meter and count the revolutions of the pump. But selecting the proper motor for the pump would be a problem. So I want to know how to determine the power of the rotary lobe pump and generate the...

Thank you so much!

Thank you so much! I 'm very grateful for your help !

Thank you so much !

Sorry to make you confused. I made this rotary PD pump to suction another high viscosity liquid and I used frequency inverter to change the motor speed. At the full speed, severe noise and vibration happened. Troubleshooting said "The liquid viscosity is too high. The pump is starving. " After...

1. Increasing clearance could minimize cavitation because of adding more slips and more pressure to inlet side ?? 2. And another question making me confused : If the liquid viscosity is too high and rotary PD pump's speed still do not slow down ,then severe noise and vibration will happen...

1.Could the slip which is caused by higher pressure at the outlet side add pressure to the inlet side and minimize the cavitation ?? 2.And I have read pump troubleshooting and it said that " Noisy operation=> Air or gas in fluid => Dissolved gas or naturally aerated products => Minimize...

"Air entrainment and recirculation will also cause the same rumbling/rattling noise and high vibration as cavitation, as well as the recognizable impeller pitting damage." I understand, thank so much! Pump specs: 120 L/min Type of fluid: Water Temperature: 25°C Pump input shaft speed: 400...

Thank you! And I just wondered if this setting could cause "Aeration" and make bubbles into pipe which make "Cavitation" easier to happen??

Thank you! And I just wondered if this setting could cause "Aeration" and make bubbles into pipe which make "Cavitation" easier to happen??