Calculations for specialists involved in the operation, adjustment and maintenance of boiler equipment and gas metering units:-Monitoring the technical condition of turbine and rotary gas meters in accordance with GOST R 8.740-2011. To perform the calculation, it is necessary to select the meter model and enter the current operating conditions - the control value will be calculated taking into account the passport data for the flow meter. Supported gas meters: RABO, RVG (ELSTER Gazelectronica LLC), SG16MT (APZ JSC), STG (EPO Signal LLC) of all sizes. Formation of an act of inspection of technical condition in PDF format is available.-View graphs of the dependence of the pressure loss on the meter on the gas consumption. The data are in accordance with the operating instructions.-Bringing the gas volume to standard conditions.-Selection of means for measuring the pressure drop on rotary and turbine meters manufactured by ELSTER Gazelectronica LLC (LGTI.407221.007D2).Heat engineering calculations:-Composition of flue gases. Determination of carbon dioxide (CO2) content, excess air ratio, heat loss with flue gases (according to Siegerts formula).-Calculation of heat losses by the method of Professor M.B. Ravich, used in the process of operational testing of boilers.-Calculation of the heating capacity of the boiler according to the reverse balance.