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Changes W 400-2 (Status 2022) – The innovations of the individual pressure test methods

06. September 2022

Changes W 400-2 (Status 2022) – The innovations of the individual pressure test methods

In the first blog post in the series Changes W 400-2, we dealt with the new requirements for personnel and measurement technology. In this blog post, we show what changes there are specifically for the different pressure test methods. Accelerated Standard Procedure (ASP) The accelerated standard...

Reading time: 11 min

Author: Dr. Johannes Hopster

Changes DVGW worksheet W 400-2 (status 2022)

31. August 2022

Changes DVGW worksheet W 400-2 (status 2022)

One of the most important sets of rules and regulations in the field of pressure testing in Germany receives an update. DVGW worksheet W 400-2 (latest version from 2004) contains technical rules for water distribution systems, especially with regard to construction and testing. Established...

Reading time: 5 min

Author: Dr. Johannes Hopster

District heating FW 602 – test methods

District heating FW 602 – test methods

To ensure the long-term security and economic operation of district heating networks, the AGFW (Association of Energy Efficiency Companies for Heating, Cooling and CHP in Germany), has created its own set of rules, worksheet AGFW FW 602, in which the various test procedures for medium pipes to...

Reading time: 6 min

Author: Dr. Johannes Hopster

District heating FW 602

District heating FW 602

In times of climate crises, energy shortages and exploding energy costs, “district heating” is gaining immense importance as a heat supplier. District heating refers to the direct supply of end customers, e.g. the supply of heat to single-family homes via district heating pipelines....

Reading time: 4 min

Author: Dr. Johannes Hopster

Basics of hydraulic pressure test – Head loss method according to W 400-2

Basics of hydraulic pressure test – Head loss method according to W 400-2

In the following explanations we try to clarify the problems of pressure tests. For complete training courses, we offer practical seminars on our test track in Haselünne. For hydraulic pressure test, we consider the head loss method procedures in detail. These are: The accelerated procedure for...

Reading time: 13 min

Author: Bernd Esders

Esders devices under extreme conditions

04. December 2020

Esders devices under extreme conditions

I know it is hard to believe, but there are situations on construction sites that push our devices to their limits and beyond. These include attacks from bulldozers, sand burials, swimming courses or fire. In order to prepare our measuring devices in the best possible way for all forms of everyday...

Reading time: 10 min

Author: Lea Schwenen

The basics of pressure tests on water pipelines – German DVGW guideline W 400-2

29. September 2020

The basics of pressure tests on water pipelines – German DVGW guideline W 400-2

The DVGW Worksheet W 400-2 explains different methods for hydrostatic testing of pipelines in more detail. In addition to the pressure loss method, there is the water loss method and the visual inspection with operating pressure. What must be taken into consideration during visual inspection with...

Reading time: 7 min

Author: Lea Schwenen

The basics of pressure tests on water pipelines

07. August 2020

The basics of pressure tests on water pipelines

This blog post on the basics of pressure testing on water pipelines is an introductory article and also suitable for students and non-experts. For experienced professionals, the next articles on successful water pressure testing will go further into detail on the various methods and their...

Reading time: 9 min

Author: Lea Schwenen

Automated leak detection

Automated leak detection

– an advanced warning system that conserves water and human resources. Climate change and shortage of qualified staff dominate the social agenda and water suppliers also struggle with these challenges: Water is precious; more so than ever during hot spells. Leaks must therefore be found...

Reading time: 11 min

Author: Clemens Fentker