Filter
Top Products
Technical Guide
DAN-LIQ-Turbine Meter-TG-0807
August 2007
Page 17
INSTALLATION AND OPERATING RECOMMENDATIONS
For a turbine meter to perform without increased uncertainty and in a repeatable and accurate manner, the owing
stream must be free of rotational components. The internal assembly supports of a turbine meter offer a slight
straightening effect, but additional ow straightening is normally required.
Generally, upstream ow straightening is effected through the use of adequate upstream straightening sections,
which often comprise a set of straightening vanes or a tube bundle. Guidance on this subject is offered in the API
Manual of Petroleum Measurement Standards, Chapter 5, Section 3.
For turbine ow meters of 2-inches and less, straightening vanes are not normally used. For most installations,
twenty diameters of upstream pipe should be provided for adequate ow straightening. (See Figure 11)
STRAINER
TURBINE METER
D= NOMINAL PIPE SIZE
FLOW
20D
MINIMUM
5D
MINIMUM
Figure 11 - Small Diameter
Meter Tube
Figure 12 - Two-Section
Meter Tube
Figure 13 - Three-Section
Meter Tube
For line sizes 2-inches and larger, upstream ow straightening sections are normally supplied with straightening
vanes. With this construction, the upstream straightening section need only be ten diameters in length.
Daniel supplies upstream and downstream ow straightening sections in either carbon steel or stainless steel, as
required by the application. The standard design offered is the two-section tube, with a single upstream and single
downstream straightening section. The upstream section contains the tube bundle, which is securely located within
the pipe section. (See Figure 12)
Flow straightening sections may in fact be supplied in any conguration, with any line connection and to any specied
length. In some installations, a three section ow straightening conguration is required. By using this conguration
ready access to the straightening vanes is afforded. (See Figure 13)
TURBINE
METER
D= NOMINAL PIPE SIZE
FLOW
10D
MINIMUM
5D
MINIMUM
METER TUBE
STRAINER
TURBINE
METER
FLOW
10D
MINIMUM
5D
MINIMUM
METER TUBE
FLANGE MODEL
STRAIGHTENING VANE
LINE MODEL
STRAIGHTENING VANE
METER TUBE