DVGW ARBEITSBLATT G 491 PDF


Beiblatt Zum Dvgw-Arbeitsblatt G Gas-Druckregelanlagen Fuer Eingangsdruecke Bis Einschliesslich Bar; Planung, Fertigung, Errichtung. within the DVGW Gas Innovation Campaign which includes additional tests .. [ 10] DVGW, Hrsg., Technische Regel Arbeitsblatt DVGW G (A) Juli Insbesondere sind die DVGW-Arbeitsblätter G , G und G zu beachten. Umbau, Ersatzteile. Jegliche technische Veränderung ist untersagt.

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Arbeitsblagt on Dec View Download Idostatic Testing Method B 1 Pressure applied once Unauthorised TranslationThis translation is not authorised by the issuing organisation and is for internal use only. In this particular code of practice, the pressure testing methods applied for gas supply piping and facilities are systematically compiled and described.

The DVGW’s technical regulations for the installation and operation of gas supply piping and facilities specify provisions for the pressure testing methods to be applied with reference to this code of dvtw. Preface to b second issueNow that the newly developed and practice-tested pressure measurement method using air by means of precision pressure gauges, e. In addition to the new pressure measurement method by means of precision pressure gauges, resulting in simplification and improvement of the measurement method using air, further amendments and additions for adjustment in line with the state of the art for pressure testing methods have been included in the new issue of this code of practice.

Table of Contents51 Scope2 General Piston Pressure Gauges B 3.

For the purpose of pressure testing on other piping and facilities outside the public gas supply sector, this code of practice may be applied taking into consideration the specific properties of gases and, where applicable, other existing provisions. The relevant testing method to be applied shall be governed by the materials used, the type of joints between the piping or facility components and the envisaged scope of application.

All pressure parameters or values specified in this code of practice are gauge pressures above the prevailing atmospheric pressure. Water may also be replaced by other suitable liquid media; below, reference is only made to water.

Air may also be replaced by other suitable gaseous media; below, reference is only made to air. Process gas may also be replaced by mixtures of process gas and inert gases; below, reference is only made to process gas. In particular, the following aspects should be taken into consideration: In the case of lower temperatures, special measures shall be taken. A sufficient stand time shall be included to allow the temperature of the added water to adjust to the ambient temperature.

When test pressure is applied, the ratio between the added volume of water and the increase in pressure can indicate inadequate de-airing or major leaks. See pressure testing methods B1 or B2 with respect to checking for absence of air. If a test pressure of considerably more than 6 bar is applied and all or all parts of the piping or facility under test have not been tested beforehand at the same test pressure or at a higher test pressure, special safety precautions shall be taken e.

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If process gas is used for testing purposes and by adding nitrogen subject to higher pressure, for example, the piping or facility involves can be subjected to a test pressure which is above the operating pressure in the piping facility or supplying the process gas.

The sequence in method B2 is depicted schematically in Fig. Master pressure gauges category min. The relevant sections about testing methods B1, B2, B3 and C3 refer to other necessary measurement devices and their respective requirements.

Overview of pressure testing methods Fig. Time sequence of a pressure test on piping using method B 23 Description of Pressure Testing Methods3.

With respect to all visual methods, the pipeline or facility under test shall be exposed; in particular, joints on piping, fittings, valves, vessels, etc. However, the test pressure must be at least 1. After filling and de-airing see Section2.

During this period, the piping or facility component group shall be particularly checked for leaks at its joints and components flanges, couplings, valves, etc. After reducing the pressure to a value as low as possible hold time 30 minuteswhich should be at least 2 bar at the absolute highest point along the pipeline, and after increasing the pressure to the test pressure, the pressure shall again be held for at least 90 minutes.

During this period, the piping shall be particularly checked for leaks at its joints and components flanges, couplings, valves, etc. If these codes of practice prescribe minimum values, the exact test pressure value shall be specified prior to testing. After applying and increasing the test pressure at a specific rate max. The pipeline joints to be tested must be free from grease and paintwork. It is recommended to repeat the test procedure at a reduced pressure and using foamants, after reducing the test pressure to approx.

After proper injection of process gas, the test pressure shall be applied and increased at a specified rate max. While test pressure is being applied and after an appropriate hold time, all piping joints, valves, flanges, etc. The joints to be tested must be free from grease and paintwork. These methods may therefore be particularly applied on buried piping which is not accessible for inspection purposes.

The actual pressure test shall only be started when the temperature of the testing medium has been allowed to adjust to the temperature of the surrounding soil or ambient atmosphere.

The yield point value K of the piping, e. The exact test pressure value shall be specified prior to testing.

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In the event of testing during periods in which the risk of frost may be encountered, exposed piping sections shall be protected against freezing.

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In order to minimise fluctuations in temperature during the test period, the pipe trench shall be backfilled as far as possible. Any valves and detachable connections shall be freely accessible as far as possible.

Wherever possible, the test sections should not exceed a length of 15km or a rabeitsblatt of 3, m. Measurement accuracy shall be increased for volumes of more than evgw. A special test rig e. To measure the temperature on the pipe wall, thermometers located at intervals of 2. After filling and de-airing see Section 2. Pressure shall generally be held for a period of 24hours once the temperature has stabilised.

During this period, all measured values shall be recorded. Prior to testing, it is recommended to check for the absence of any air inside the piping. With respect to the pipe wall temperatures along the buried part of the test section, it is generally sufficient to take thermometer readings at intervals of sixhours. All other values shall be measured at hourly intervals.

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At the end of the hold time, the piping shall be checked for absence of air by means of a drain test. For this purpose, the pressure shall be reduced at least twice. Only the volume of water which is drained off last and the associated reduction in pressure shall be taken into consideration for purposes of evaluation.

These deviations may be due to negligible volumes of air trapped inside the pipeline, pipe ovality as well as wall thickness and diameter tolerances. The deviations should be taken into consideration with arbeitsblqtt to in formula 3. If there is no deviation, the following equation applies: The change in volume of the test section can be established from the following equation: EvaluationDue to the measurement tolerances of this method, changes in volume generally arbeitsblstt which, in total, do not cancel each other out and which can be converted by inserting all the tolerances into the relevant calculation formulae.

For the purpose of determining this permitted hourly change in volume, it is therefore sufficient to apply the following simplified formula: Pressure Testing Methods Dvgw g Documents. Acta Ple III Dvgw qe master at Documents. Waega dvgw g en Documents.

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