[tanqas]

Can anyone come out with NEW ideas to solve my problem?

4 Possible ways of solving the problem( to Solve the Mixing Point From High to Low Pressure Side)


1. Placement of a 3 Way Valve• 1 inlet and 2 discharge.
• 1 splinter to throttle down to 20 bar.
• Using the pressure gauge to check if desired pressure of 20bar is reached to enter the low pressure side.
• Rest of the excess pressure is to be rejected back to the feed tank.

2. Pressure Reducing Valve• Pressure reducing valve would ensure that the incoming pressure to the low pressure side would be of 20bar.
• However, a disadvantage to the pressure reducing valve would be a doubt on whether upstream pressure would be build up to a high amount ~60bar

3. 2 Gate Valve Method• Valve for feed inlet is fully opened.
• Valve on top left hand corner is being used to control back pressure.(Picture is attached at bottom)
• Valve on the bottom is used to control downstream pressure into the low pressure side.
• Advantage of being able to control both upstream and downstream pressure by throttling of the gate valves and obtaining desired inlet pressure by observation on pressure gauge. Most commonly used in industries (e.g. issues on fouling of membrane can be overcome by increasing inlet flow to obtain desired amount of permeate flowrate.)

4. Placement of Orifice Plate• Being able reduce the downstream pressure to 20bar.
• Trade-off of not being able to determine downstream pressure. Always kept at constant.

Amongst these 4 methods, method 3 of using the 2 Gate Valves was chosen.


Issues on Flow

2 Gate Valve Method Employed
• Concern that when excess pressure is directed back to the feed tank, significant amount of flow would be lost when entering the low pressure side.

• This can be overcome by increasing the flowrate by adjusting the speed of the Product Pump via the VSD on the control panel thus transferring a higher flow rate to be entered into low pressure side.

[tanqas]

please help me 

[eugenedakin]

Hello tanqas,

It looks like you have described the most common methods to mix materials at two different pressures.

Is there a reason why you are looking for other methods to solve the problem? The reason why I am asking is that other methods become more complicated and are more prone to problems.

Thanks for your comments,

Eugene

[tanqas]

my downstream equipments are rather sensitive and thus i wish to think of a way to lowering the pressure so as to allow the equipments to work under the low pressure as required