WIKA FloTec pitot tubes are used for measuring flow according to the differential
pressure principle. The volumetric flow is calculated from the difference between
the static pressure and the dynamic pressure using Bernoulli’s principle and
taking into account the pipe inner diameter. Using four dynamic ports this
instrument is able to evaluate a better profile for the velocity inside the pipe. This
ensures a higher accuracy in the measurement.
The upstream side is designed to generate a break point, due to which the
medium passes around the pitot tube without causing any turbulence. This
feature creates a stable pressure with a constant flow coefficient at the
downstream measuring point, even at high flow rates. Thus a very wide range of
applications in the field of flow measurement is enabled.
Depending on the inner diameter, the medium characteristics and the Reynolds
number, a vortex will be generated around the pitot tube. A support mounted on
the opposite side of the pipe can be supplied should the natural frequency of the
pitot coincide with the vortex shedding frequency. The necessity test is performed
during the design phase.
The differential pressure output of the pitot tube is normally connected to a
differential pressure transmitter in order to generate an electrical signal from the
differential pressure. This electrical signal is proportional to the flow rate. A
differential pressure gauge or a differential pressure switch can be used to
provide local indication of the flow rate or for switching tasks.
Depending on the selected mounting type, the flange will respect the nominal
pressure rating of the pipeline (in accordance with the relevant standards). The
pitot tube is suitable for the measurement of one-phase media which completely
fill the cross-section of the pipe. The nominal sizes range from 50 ... 1,800 mm
(2"... 72"), the pipe schedule is specified by the customer.
Main characteristics of the Pitot Tube:
- Low installation costs
- Long-term accuracy
- Minimal unrecovered pressure loss
- Available in fixed and extractable versions
- Completely from stainless steel AISI 316, other materials are available on request
Special Features of the Pitot Tube:
- Suitable for liquid, gas and steam flow measurement
- Accuracy ≤ ±2 % of actual flow rate
- Repeatability of measurement 0.1 %
- Ensure the lowest pressure loss in the family of primary flow elements (approx. < 1 %)
Application:
- Oil production and refining
- Water treatment and distribution
- Gas processing and transmission
- Chemical and petrochemical industries