we don't measure the pressure differential because of the cost to
implement the system, ie the plumbing.  this is done industrially
primarily where the system doesn't have a relief valve, or one is not
desired.

jonathan

On Wed, 23 Mar 2005, Jere Hawn wrote:

> HI again,
>
> In the Navy we use pressure differential across the filter to determine if
> it needs to be cleaned or serviced.  If my memory is correct if the pressure
> from the inlet side of the filter was 10 lbs greater than the outlet side
> then the filter needed attention.  Why don't we use this?  Has anyone heard
> of it?  Is there any way to tell?
>
>
>
> Jere
>
>
>