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Installation and initial operation
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2.2
Daniel Method of aligning meter tube flange to
"PT" Meter flange
Internal alignment throughout the metering section is vital to prevent offsets, steps or
gasket protrusion within the bore which could cause disturbance to the flow pattern.
Alignment is accomplished by dowel-pinning.
On all Daniel raised face flanged "PT" Meters and "PT" Meter Tubes three knock-out dowel
pin holes are drilled in each flange for alignment of the bore of the meter to the bore of the
meter tube.
On ANSI Class 150 lb. and 300 lb. meters and meter tubes where the dowel pin holes are
located tangent to the raised face, female face-type gaskets are used.
On ANSI Class 400 lb. through 2500 lb. meters and meter tubes where the dowel pin holes
are located beyond the inner bolt circle, series-type gaskets are used.
Care should be taken not to allow the gasket to protrude into the flow stream upon
installation.
It is recommended that dowel pins be removed after flange bolt-up and grease packed in
the holes to prevent rust.
2.3
Meter tubes
Experience has confirmed the necessity of adequate upstream and downstream straight
pipe adjacent to the meter. Daniel
fabricated to proper dimensions and tolerances to assure that the flow pattern through
the meter is undisturbed by piping configuration.
The table of recommended dimensions for "PT" Meter Tubes takes into account piping
design, where swirls and disturbances are introduced by fittings, valves, etc., adjacent to
the meter tube section. The recommended lengths shown (with a straightening vane) are
for the maximum flow disturbance conditions. The illustrations show proper positioning of
straightening vanes.
10
Internal/external pressure
Ambient and operational temperatures
Static pressure and mass of contents in operating and test conditions
Traffic, wind and earth loading
Reaction forces and moments which result from supports, attachments, piping, etc.
Corrosion, erosion, fatigue, etc.
Decomposition of unstable fluids
Possible damage from external fire
™
"PT" Meter Tubes and straightening vanes are
"PT" Liquid Turbine Meters
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