3.1.1
Aligment of 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.
Procedure
1. 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.
2. 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.
3. 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.
4. Care should be taken not to allow the gasket to protrude into the flow stream upon
installation.
5. It is recommended that dowel pins be removed after flange bolt-up and grease
packed in the holes to prevent rust.
3.1.2
Meter tube recommendations
Experience has confirmed the necessity of adequate upstream and downstream straight
pipe adjacent to the meter. Daniel “PT” Meter Tubes and Straightening Vanes are
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.
The vanes may be eliminated if adequate straight pipe exists upstream and downstream.
For pipe lengths not requiring vanes, see Daniel Catalog Section “D”, AGA Report No.3,
the ASME Power Test Code, or API Standard 2534.
Figure 3-1: Meter tube and PT Meter flanges alignment
3.1.3
Meter tube recommendations
Experience has confirmed the necessity of adequate upstream and downstream straight
pipe adjacent to the meter. Daniel “PT” Meter Tubes and Straightening Vanes are
Installation and initial operation
Installation and maintenance instructions
October 2019
3-9008-011
26
Daniel “PT” Liquid Turbine Meters
Summary of Contents for Daniel PT
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