Turbine Flowmeter Body

Depends on your application - fluid and ambient. The main difference is in corrosion resistance.

SS304- General purpose, highly corrosion resistant.

SS304L- Improved over 304 (especially in intregranular corrossion). Stress relieving after welding not required.

SS316 - Resistant against halogens, better hot strength.

SS316L - like 316, with better weldeability.

Now decide based on your application.

The other aspects (what you have expressed doubt about) are not important.

This link will give better details about the chemical compatibility of various SSs

I agree that if the metal is compatible with the fluid then 304 is fine.

Is there a price difference between 304 and 316 items?

there are no price differences....

but we accpeted SS304L....we went through many confusions ......like magnetic permeability of SS304L is more or less as this would be the main cause to creat in error in flow measurement of Turbine flowmeter.

then specific heat is negligible.....for SS304L

So SS 304L is compatible....

thanks to all the experts....who put their opinions...this also helped me a lot.

thanks again to all

As others have said 304 is fairly corrosion resistant but not as resistant as 316. If you are using for hydraulic application with petroleum based fluids if will make no difference. If you ever intend on using for strong acid or base fluids insist your supplier provide what was originally quoted.

Regarding the specific heat changing the viscosity. I would be absolutley shocked if it made a difference. For the turbine to be an effective measurement tool it should have been selected /sized for the flow range and viscosity that you presumably specified. This would mean that the media being measured will not be in contact with the steel long enough to make a difference. If your measurement requires that degree of accuracy a turbine meter is not the correct device in the first place.

generally turbine flowmeter gives a good volumatric flow rate for clean fluid.

Caution msut be taken that....any magnetic field should not be arround.

Else turbine flowmeter depends on viscosity of the fluid. if the fluid is more viscous.then the resistance to the flow will be more hence this kind of fluid cant rotate the turbine blade with good RPM.hence Pick up coil senses the RPM and which proprtional to the volumatric flow will be less.

So if temperature is more viscosity will be less and in this case Flowrate will be more.

thats why turbibe flowmeter calibration includes K factor versus Viscosity curve.

remember the fluid which is more viscous turbine flow meter is not gud.

John

What is the pipe in which this meter is installed made off?

You only have a problem if it is 316SS .

If the pipe is carbon steel then there should not be any problem.

Good point brought out. Check for the compatibility of the two materials - pipe line and the meter vis a vis galvanic corrossion.

In case there is a likely problem you may have to steps to avoid - by putting suitable insulation/coating on the contact surface between materials.