KST – KROMSCHRÖDER SYSTEM TECHNOLOGY

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Gas inlet sections

overview

Gas pressure control, measuring and safety train

With measurement, With pressure control, With tightness control, With SSV/RV, Not calibratable, 1 stream, 2 valves
Flowchart No.: 2.2.2.2.2
Standard: EN 746-2

No. Component description Standards and Docuthek
010 Manual isolating valve, e.g. manual valve AKT
020 Filter, e.g. gas filter GFK

Our tip: at maximum flow rate, filters should show a pressure loss of no more than 10 mbar.

030-040 Pressure gauge, e.g. pressure gauge with capsule element KFM or pressure gauge with Bourdon tube RFM with pressure gauge valve DH or MH
050 High pressure shut-off device, e.g. safety shut-off valve JSAV

Our tip: use the same nominal diameter as for the gas pressure regulator so that a reduction in the pipe diameter is not necessary.

060 Gas pressure regulator, e.g. pressure regulator for gas VGBF

Pressure regulators should be designed to be as small as possible.
Our tip: to achieve good control characteristics, the maximum pressure gradient (difference between the inlet pressure and the required outlet pressure of the regulator) should be fully utilized.

070 Shut-off valve, e.g. manual valve AKT

During operation, the valve must be secured open.

Our tip: remove the lever of the manual valve to prevent incorrect operation.

080 Relief valve, e.g. safety relief valve VSBV

Safety relief valves are designed to relieve pressure peaks in pipe systems thus preventing the safety shut-off valve from being activated unintentionally.

090 Gas metering equipment, e.g. flow meters DM, DE
100 Low-pressure cut-off, e.g. pressure switch for gas DG

The min. pressure switch setpoints to be adjusted depend on the installation location and the process conditions.

Our tip: pressure switches should be installed preferably with horizontal or vertical diaphragm. Ensure that no dirt or moisture can penetrate the open ventilation ports.

110 High gas pressure protection, e.g. pressure switch for gas DG

The max. pressure switch setpoints to be adjusted depend on the installation location and the process conditions.

Our tip: pressure switches should be installed preferably with horizontal or vertical diaphragm. Ensure that no dirt or moisture can penetrate the open ventilation ports.

120 Automatic shut-off valve, e.g. solenoid valves for gas VAS

 

130 Gas pressure switch, e.g. Type DG

Our tip: adjust the pressure switch to half the inlet pressure to ensure correct functioning of the tightness control.

140 Valve proving system, e.g. tightness control TC 410

The standard EN 746-2 stipulates a tightness control for capacities over 1200 kW.

Application

Main gas train to EN 746-2. This is a part of the gas distribution system of the industrial thermoprocessing equipment (IThE), e.g. for downstream single burner systems.

Function

If the main shut-off valve (010) is open, the pressure and quantity required for the IThE are controlled by the gas pressure regulator (060). Any dirt in the gas or pipe system will be removed by the filter (020) first. If the gas pressure regulator (060) suffers a fault (e.g. a diaphragm fracture), the gas supply will be stopped safely by the high pressure shut-off device (050). The relief valve (080) prescribed here vents low leakage rates of the high pressure shut-off device and prevents unintentional tripping in the event of pressure surges. It therefore ensures the supply of the IThE is highly reliable.

The automatic shut-off valves (120) are part of the protective system, as are the low-pressure cut-off (100), the high gas pressure protection device (110) and the valve proving system (140). These compulsory safety devices are actuated separately by the process control system. In the case of insufficient or excessively high gas flow, the process control system will receive a signal and shut off the gas supply safely by closing both valves (120). Before each commissioning or after switching off the system, the valve proving system (130) checks the functioning of these valves.
The quantity of gas consumed can be read off the flow meter (090). The inlet and outlet pressure will be displayed on the pressure gauges (030/040).

Note

The respective unit accuracy groups, lock up pressure classes and accuracy classes must be observed to ensure optimum adjustment of gas pressure regulator, high pressure shut-off device and relief valve. We recommend the generation of a pressure scaling diagram to exclude tolerance-related interferences of settings.

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