52
Orifice plate (13) change operation
Section 4: Orifice plate installation and removal instructions
Owner and operator manual
January 2015
3-9008-001 Rev M
4.3
Orifice plate (13) change operation
Important
In order to perform a safe and efficient plate change operation with a Senior, the on-site
personnel must evaluate both the service and environmental conditions prior to beginning this
operation. These conditions may have a dramatic effect on the time required for an operator’s
ability to return the Senior to its measurement condition.
The Daniel Senior Orifice Fitting’s Top (14) is designed to temporarily hold the Plate Carrier
(8DM or 8DMC) during plate change operations.
An operator controlled, grease assisted, slide valve separates the Top (14) from the line pressure
to ensure optimum sealing performance. The slide valve grease used to achieve this
performance may migrate into the Top (14) during the plate change operation. If this was to
occur, the slide valve may not perform optimally and may leak.
The grease migration process is both time and environmental condition dependent. Therefore,
Daniel offers two plate change procedures that an operator may choose from in order to
perform this process in the safest and most efficient manner. The two procedures that Daniel
offers are the “Quick Change” process and the “Extended Time” process.
The “Quick Change” process is a procedure based upon the operator’s knowledge that the
entire Orifice Plate (13) installation and removal, the time spent from the Top (14) fluid
evacuation to the full replacement of the Clamping Bar (12 or 12HP), the Sealing Bar (9 or 9HP),
and the Sealing Bar Gasket (9A, 9A-HP or 9CF) is under fifteen (15) minutes. The “Extended
Time” process is a procedure based upon the operator’s knowledge that the entire Orifice Plate
(13) installation and removal, the time spent from the Top (14) fluid evacuation to the full
replacement of the Clamping Bar (12 or 12HP), the Sealing Bar (9 or 9HP), and the Sealing Bar
Gasket (9A, 9A-HP or 9CF) is over fifteen (15) minutes.
The procedural differences between these two processes are that, once the Plate Carrier (8DM
or 8DMC) is extracted from the Senior, the “Extended Time” process requires the operator to
place a new Sealing Bar Gasket (9A, 9A-HP or 9CF) along with replacing the Sealing Bar (9 or
9HP)/Clamping Bar (12 or 12HP) on the Top (14). Additionally, the operator is required to add
grease to the Senior prior to removing the Sealing Bar (9 or 9HP)/Clamping Bar (12 or 12HP) in
order to reinsert the Plate Carrier (8DM or 8DMC) assembly.
For “Soft Seat” equipped Seniors the operator may use either the “Quick Change” or the
“Extended Time” plate removal procedures based upon the immediate service and
environmental conditions encountered.
Daniel recommends either the “Quick Change” or the “Extended Time” plate orientation
process for users of Seniors equipped with lubricated slide valves. Both the “Quick Change” and
the “Extended Time” plate removal processes are provided for users of the Daniel Senior Orifice
Fittings with lubricated slide valves.