01 flow tech intro

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For internal use only / Siemens AG 2009. All Rights Reserved.

Flow Concepts

Paul Murphy

Siemens Industry Inc.


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Welcome

Siemens Industry, Inc. 2010

An expert is a man from an other town

S. Clemens


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Siemens Industr y, Inc. 2010

This document includes confidential data that shall not be duplicated, used, distributed, or disclosed for any purposeunless authorized by Siemens.

Flow Concepts

A few things to consider in no particular order

These are issues common to all flow meter technologies

All flow meters are application sensitive- no one technology works best

everywhere- have an open mind


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Flow meter sizing

Maximum flow Rate

Minimum flow rateNormal flow rate

Pipe size

Be realistic, many systems are OVERSIZEDUse the sizing programs when you can

Understand the performance trade off of r ight size vs. convenient size


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Flow Profi le

What is flow profile?

What affects this?

How does it affect measurement?

1. Linearity

2. Repeatabil ity

3. Accuracy


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Flow Profi le


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Reynolds number

What does it mean

Why it is not usually important in water applications

Turbulent vs. laminar flow


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Page 8Flow seminar




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Flow Calculator


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Whats in the fluid?

Is the fluid clean ?

Suspended solids

Aeration its causes and effects

How this affects flow measurement


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The effects of aeration

May be measured as liquid, will affect measurement

Velocity based systems -mag, ultrasonic, turbines etc. will generallyread high

Mass meters may read correctly but volume may be erroneous

Processes may be affected- pumps, cooling etc.


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Changes in the fluid

How stable is the process

Are there changes in viscosity, temperature or density

Does pressure change?


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How stable is pressure?

Pressure transients and problems that they cause

ARVs, PRVs and similar devices

Too much pressure?


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Large line considerations

Access to pipe- often limited

Condition of pipe inside and out

Do you really know the o.d. and w/t?

How round is the pipe?

Is there a way to verify measured flow?

High or low f low velocity?

Full pipes only!


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Page 15Flow seminar

Siemens Industr y, Inc. 2010This document includes confidential data that shall not be duplicated, used, distributed, or disclosed for any purposeunless authorized by Siemens.

108 Bi-directional flow


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How does flow velocity affect accuracy andperformance?

Changes in flow profi le

Operating outside the design range for the meter


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Multi-phase Flow

What is multi-phase flow?

Oil and Water

Partially Full Pipe

Excessive aeration


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Some meters require conductive fluids


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Valves

Control valve issues

Block valves

Valve designs are different


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Page 20Flow seminar


Whats wrong with this?


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Page 21Flow seminar



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Whats in the pipe?

Pipe liners-cement lined, concrete

cylinder pipe

Scale and corrosion

Sediment


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Vertical Flow Problems- downward flow

Phase discontinuity and what it means

How to deal with this type application


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Turn down

Min to max flow rate at specified accuracy?

Span adjustment capabil ity of a meter?

Different things to different technologies and different

people!


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Pipe Info

Why do you need to know about pipe?

What you need to know-

1. Some technologies require more info2. o.d., i.d., wall thickness, pipe material

3. Liner material and thickness

4. General characteristics of the pipe-Is it really round, is it an old riveted pipe etc.?


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Page 27Flow seminar Siemens Industr y, Inc. 2010This document includes confidential data that shall not be duplicated, used, distributed, or disclosed for any purpose

unless authorized by Siemens.

Large riveted pipes1920s vintage


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Calibration

How was it calibrated?

When was it calibrated?

Calibration stories-wwtp, brewery, crude oil, orifice plates-

backwards, wrong size

Can you calibrate a meter in service?


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Flow Lab


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Prover


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The Real World

What are your real needs? Are you looking for

accuracy, repeatability, reliability..

What are you willing to do to achieve these goals?

Real accuracy always has a price!


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The Real World- continued

What are your maintenance and support capabilities?

How critical is the application?

What is plan B?


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Questions, comments..


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For internal use only / Siemens AG 2009. All Rights Reserved.

Paul Murphy

Flow Specialist

4401 El Camino Real

Suite K

Atascadero, CA 93422

Phone: 805-461-1707

Cell: 805-286-2616

E-Mail: [email protected]

Thank you for your attention!

01 flow tech intro

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