Liquid Controls MS Meters - Manual (Page 9)

9
System Design Considerations
Design for Special Mounting Arrangements
Design for Standard Mounting Arrangements
(straight through flow)
Regardless of meter mounting configuration,
accessories such as the air/vapor eliminator must
always be mounted in a vertical orientation to permit
proper operation of the float-actuated apparatus.
Design for Hot Oil/Steam Jacket Options
Heating a meter can be accomplished by hot oil/steam
jacketing the meter’s rear cover and/or packing gland
boss. A heat jacketed meter does not preclude the
necessity for insulating the meter and surrounding piping.
Design for Ensuring the System Remains Full of Product
The first consideration is merely filling the piping for the
first time. The filling of the system must take place slowly
in order to avoid pressure “spikes” or transients caused
by rapid acceleration or deceleration of the liquid. Under
gravity flow conditions, pressure transients in orders of
magnitude larger than the available head pressure are
possible. At this time, air must be removed from the system. Make
sure that a positive head condition is always present in
the system (which should be designed into the system).
Air or vapor in the system contributes to error in
measurements while metering. Once air is removed from
the system, ensure that the system design does not allow
for air to re-enter the system once it is full of product.
Special flange arrangements are available as shown.
Contact the factory for details or additional information.