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, No SSV/RV, Not calibratable, 1 stream, 1 valve
Flowchart No.: 2.2.2.1.2.a
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 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.

060 Gas metering equipment, e.g. flow meters DM, DE
070 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.

080 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.

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

 

100 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.

 

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

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

120 Relief valve, e.g. solenoid valves for gas VAS

Auxiliary valve to assume the function of the leak tightness device in multiple burner systems. Vents the downstream pipeline into a safe area.

Our tip: take the line into the open air.

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 multiple 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 (050).Any dirt in the gas or pipe system will be removed by the filter (020) first.

The automatic shut-off valve (090) is part of the protective system, as are the low-pressure cut-off (070), the high gas pressure protection device (080) and the valve proving system (110). 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 the valve (090). Another valve, which must be installed directly upstream of the burner, will also be closed.
Before each commissioning or after switching off the system, the valve proving system (110) checks the functioning of these valves. Here, the gas volume enclosed between the valves must be channelled off to a safe area by opening the venting valve (120).
The quantity of gas consumed can be read off the flow meter (060). The inlet and outlet pressure will be displayed on the pressure gauges (030/040).

DOCUTHEK

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