Nearly all types and makes of ultrasonic flowmeters require some length of straight pipe upstream and downstream of the flowmeter itself.

People familiar with flow measurement know that flowmeters often require a good velocity profile upstream of the flowmeter to measure accurately. Throttling a control valve causes its velocity profile downstream to become distorted. David W. Spitzer is a regular contributor to Flow Control magazine and a principal in Spitzer and Boyes, LLC

Q: I am purchasing vortex flowmeters and having doubts. I use when determining the lengths of the upstream and downstream straight runs?

Required Straight Run to install flowmeters Technology On Flow Measurement F-0009 Required Straight Run to install flowmeters To obtain specified accuracy, straight run both for upstream and downstream is needed. The required straight run is depeding on the type of flowmeter. The recommended straight run by type is shown below.

Turbine flowmeter is a common type of flow meter. Install process connections to ensure that the tube goes upstream and downstream of the meter place. The minimum straight run upstream should be at least 20 diameters and the straight run downstream should be at least 5 diameters length.

FLOW METER PIPING REQUIREMENTS “Diameters” of straight pipe required for various types of fl ow meters Diameter (D) = nominal Pipe Size Example: 13 Diameters of 6" pipe = 78" 13

The desired upstream straight pipe length is 1000mm. Downstream: allow a minimum straight pipe length at least 5 times the internal diameter of the pipe. For example, with the 50mm

Jul 13,  · In some cases, there is just not enough pipe to accommodate the minimum straight pipe requirement. In this case, you should use the 2/3 rule. Install the flowmeter with 2/3 of the

Upstream/downstream piping length To ensure specification accuracy over widely varying process conditions, install the sensor with a minimum of five straight pipe diameters upstream and two straight pipe diameters downstream from the electrode plane. See Figure 1. This procedure should adequately allow for disturbances created by

elbow and the upstream side of magnetic flow meters was completed in this research. installed only three diameters downstream of the elbow.

For Water meters to operate correctly the flow upstream and downstream of the flow-meter must be as free as possible from obstructions, 

Flow meters are flow measuring instruments used to measure the linear, Upstream length/ Downstream straight length is 20 / 5 

their flow meter suppliers to provide engineering recommendations Recommendation for Flow Controlling Valves Upstream or Downstream. Pipe Size. Upstream.

1) Recommended lengths are guidelines based on ASME MFC-14M. (2) All straight lengths are expressed as multiples of the pipe in side diameter D and shall be measured from the upstream face o f the orifice plate to the disturbance. (3) For beta ratios not listed, use requirements of next higher beta ratio listed. 183 September 2014Rosemount DP Flow

Note: in no case does a flowmeter installation automatically require a 1D of straight pipe length after the meter. U.S. = upstream. D.S. = downstream.

The desired upstream straight pipe length is 1000mm. Downstream: allow a minimum straight pipe length at least 5 times the internal diameter of the pipe. For example, with the 50mm pipe, there should be 250mm of straight pipe immediately upstream. The desired upstream straight pipe length is 500mm. Share This Story, Choose Your Platform! Contact Us

NTS 15/05/06 D - PIPE INTERNAL DIAMETER FT - INCONEL VORTEX FLOW METER — DIRECTION OF FLOW NOTE - STRAIGHT PIPE LENGTH ON THE DOWNSTERAM SIDE TO BE 5 X PIPE DIAMETER MINIMUM TITLE : UPSTREAM DOWNSTREAM PIPING SHEET NO.

Typical recommendations suggest 35 straight pipe diameters upstream and 5 straight pipe diameters downstream. If you don't have sufficient upstream straight run, some manufacturers allow for K factor corrections that could reduce this requirement.

1, 2, and 3 are respectively the front, behind and by-pass valves and 4 is the flow meter. L≥10D and L>=5D are respectively front and behind pipelines whose lengths are larger than 10 and 5

But, a partially open valve upstream of the meter will require 25X the piping diameter, and multiple disruptions, such as a spiral or consecutive elbows, can 

Cable type To transmitter Maximum length Micro Motion 9-wire 9739 MVD transmitter 1,000 ft (305 m) All other MVD transmitters 60 ft (18 m) Micro Motion 4-wire All 4-wire MVD transmitters — 1,000 ft (305 m) without Ex-approval — 500 ft (152 m) with IIC rated sensors — 1,000 ft (305 m) with IIB rated sensors