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The 3 lines for oxygen and propane each go via a dome. The pilot control gas is regulated via proportional valves controlled by a PLC. Automatic adjustments of the Pilot Gas pressure regulate the flowrates into the burners, thereby controlling the cutting process.
The domes minimise any variations, and allow for optimal cutting, at a fraction of the price of a fully electronic control system.
The customer demanded a very high performance and reliable pressure control of a nitrogen supply for the packaging of potato snacks. To meet this challenge, WITT installed two supply lines in parallel, each with a dome pressure regulator set 767LE/S.
The gas is regulated from 12 bar down to 6 bar. The dome pressure regulators function independently. To allow for maintenance, ball valves enable each Dome to be isolated. This parallel arrangement gives 100 % up-time.
The process required a constant 10 bar supply of nitrogen into the annealing furnace, from a 13 bar tank. The customer requested a parallel redundant system, plus a roof cover.
The average gas flow per furnace should be around 150 Nm3 / h, and 4 should be mounted, allowing up to 600 Nm3 / h. To allow for major process upsets requiring emergency N2 blanketing, a maximum flow rate of 1 600 Nm3 / h was set. Because the WITT Dome sets are also able to regulate small flows precisely, a single redundancy capability was designed for using the WITT 757 Set.
The customer required an electronic pressure control system, with redundancy, to deliver a minimum flow of 2 200Nm³/h at up to 14 barg, from an inlet pressure of 15 barg. This was achieved with one WITT dome pressure regulator set 767LE (with proportional control) per line.
Upon request, a motorised shut-off valve was included on the inlet, to allow complete shut-off. Additionally, manual shut-offs before and after each regulator were included, to allow the evacuation of each line.
The design, build and commissioning of the system was undertaken by WITT partner Gustus & Partner GmbH, in cooperation with the customer.
This customised system, fully assembled in a lockable cabinet, controls the supply of oxygen into an industrial waste water treatment plant.
The detailed specification to ensure a flow rate of some 1 000 m³ / h, was drawn up by specialist WITT company Gustus & Partner GmbH in conjunction with the customer, pre-commissioning TÜV certification.
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