International Workshop on Water and Heat MetersInternational Workshop on Water and Heat Meters

Recommendations of design criteria for the development of improved cartridge meters

Braunschweig – October 23 2013Bernd Caspar-Petersen / Itron - Georg Luhn / Qundis

1

Bernd Caspar-Petersen

Company: Itron/ Allmess GmbH

Profession: Mechanical Engineer

Current Job: Sales and Marketing

Age: 58, married, no children

Committees:

− DIN NA Water Meters, Mirror committee CEN /TC 92/WG2

− DVGW TK 3.3 Water Measurement

− VDDW TC Water and Heat Meters

Authors

Georg Luhn

Company: Qundis GmbH

Profession: Engineer for Automation

Current Job: Head of Test Department

Age: 58, married, 2 children

Committees:

− DIN NA Water Meters, Mirror committee CEN /TC 92/WG2

− VDDW TC Water and Heat Meters

− different WG’s for water, heat and cooling meters

2

Contents

1) Introduction and Background

2) Recommended Design CriteriaList of seven major recommended criteria with possible solutions / examples

3) Summary and Outlook3) Summary and Outlook

3

Recommendations of design criteriaIntroduction and background

• In the context of the already presented project, the working group has discussed the „state of the art-design“ of all member’s cartridge meters

• The WG members represent a common experience of more than 35 years in production and use of cartridge meters in Germany and adjoining countries, like Austria, Switzerland or Czech Republic.

• Based on the existing and proven solutions the WG has created a set of recommendations that can be used for future developments.

• The following presentation provides just an overview, it doesn’t claim to be comprehensive neither to be obligatory.

• Some design criteria are supplemented by examples of possible solutions.

4

Recommended design criteriaOverview

Safety of installation

Simplicity and comfort of mounting

Insensitivity against flow disturbances

Design criteria

Safety against bypass

Safety against fraud

and manipulation

Robustness in terms of

dirt deposits

Minimized pressure loss

5

Recommended design criteria1. Safety of installation

Product marking

Markings on interface and cartridge meter

Good readability (in-wall)

Unambiguous identification

Identification code EN 14154/ ISO 4064,

EN 1434

Safety of installation

identificationEN 1434

Minimized number of

additional parts

No adapters, safe positioning of gaskets

Installation manual

Clear instructions, qualified personnel

Putting into service

Suitability check of installation

Purging of pipe and meter

6

Recommended design criteria2. Simplicity of mounting

Standardized tools Standard threads

Quick mounting of Ease of use

Simplicity and comfort of mounting

Quick mounting of cartridge meter

Ease of use (e.g. bayonet coupling)

Compact design Slim cartridge diameter

Suited for in-wall mounting

Accessibility from front

7

Recommended design criteria3. Safety against Bypass

Checking possibilities Leakage control

Safety against bypass

Form- fit of cartridge & interface

Sealing encapsulated

“Poka Yoke” principle

Sealing Protected sealing surfaces

8

Recommended design criteria4. Safety against fraud and manipulation

User seals between cartridge meter and

interface

Safety against fraud and

manipulation

Sealing Mark

Sealing mark or device clearly visible

EN 14154 requirements

Protection of calibration elements, protection

against static magnetic fields etc.

9

Recommended design criteria5. Robustness in terms of dirt deposits

Smooth internal surfaces

No edge, minimum quality of surfaces,

inert material

Robustness in terms of dirt

deposits

Avoid room / corners for deposits

Optimized flow conditions

Enable inspection Visibility

10

Recommended design criteria6. Minimized pressure loss

Large cross- sections Special know-how

Minimized pressure loss

Reduced number of bends

Special know-how

Smooth surfaces

Standardized tests EN 14154

11

Recommended design criteria7. Insensitivity against flow disturbances

Well-defined up- and downstream conditions

Provide room for flow conditioner if necessary

Insensitivity against flow disturbances

downstream conditions

Provide minimum up-and downstream lengths

Measurement principle Refer to PTB report

12

Recommended design criteriaSummary and outlook

• The working group has identified 7 criteria which should be considered during development, manufacturing, installation and putting into use of cartridge meters.

• Many of these criteria are already realized on existing products on the market.

• The working group doesn’t see the need to standardize the details, as this would freeze technical progress and block new solutions.

• The close cooperation between manufacturers, users (VDDW and ARGE) and PTB pushes permanently for better, safer and more efficient solutions in the field of cartridge meters.

13