Design principlesThe main design criteria are the following:- All major components will be supplied mounted on structural frames. Each skid will include inlet and outlet pressure equalization valves, inlet valves with small bypass compensation valves; Nitrogen blanketing nozzles with quick coupling, non-return valve where necessary and isolation valves; and safety valve for thermal expansion where necessary. - The emergency closing valve will be piloted by means of a double solenoid valve with a logic of 2 over 2 for closing.- Absolute filters will include permanent access for cartridge removal and a superior inspection hatch.- In accordance with the concept of classification of hazardous areas, all components will be certified for service in explosion zones according to the needs of their classification.- The flowmeters will be of the ultrasonic or turbine type. If they are of the turbine type, they will be equipped with a flow stabilizer upstream of the flow meter.- The ball valves for the main lines will be full port with a “trunnion” type ball design, with a caliber that can be traversed by a tube cleaning device (PIG type), safe against fire and suitable for areas classified as explosive, with A 216 WCB cast steel body (or similar) for sizes greater than 2”, and forged steel body for sizes less than or equal to 2”. The ball material shall be stainless steel and the body shall also be stainless steel when fitted to stainless steel piping. For maintenance reasons, ball valves will have flanged ends.- Piping material within the plant boundaries will be A 106 grade B carbon steel before the fine filters and stainless steel downstream of the fuel gas yield heater. - Safety valves, pipes, valves and instruments designed to withstand the maximum design pressure of the connection systems.