Re: Control valve station

Mr Santharam:

when we design a control valve station we consider a couple of things regarding valve placement. we want the valve handles to be accessible to the operator, and actually have specifications regarding handle height above grade and handle orientation. in addition, we place the bypass valve directly above the control valve if we are using a "short control valve" such as an actuated ball valve. and we place the bypass valve offset from the control valve if we are using a "tall control valve" such as an actuated globe valve. and in some dirty process services we place the bypass valve below the control valve to allow us to flush sediment around the valve in the case of pluggage.

hope this helps.

At 10:02 PM 2/20/2008, you wrote:

>Dear friends,
>
>I am santharam. I am working as Piping Engineer. I am having
>some doubts in control station. Consider a control station which is
>500mm from the ground level. Both the gate valves are present at both
>the sides of control valve. In some cases the bypass valve is placed
>parallely above the control valve & in some other cases it is placed
>at 45 degrees vertical to the control valve. why is it so?
>
>

Thomas G Laupa PE
Senior Engineer - Nalco Company
Office Address: 1601 Diehl Road, Naperville, IL, 60563 Courier Address: 1003 Remington, Fort Collins, CO, 80524 970-227-5127
800-493-5009 fax

[Non-text portions of this message have been removed] Received on Thu Feb 21 07:40:00 2008