international workshop on water and heat meters · • the wg members represent a common experience...
Post on 22-Aug-2020
0 Views
Preview:
TRANSCRIPT
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
top related