Gas Network Equipment
Common questions – information
What is a semi-automatic switch over board?
A semi automatic switch over board is a system which provides a continuous gas supply to the piping system. One source of gas is used as the primary source, while a second source is held in reserve.
When the primary source reaches a predetermined pressure, the reserve supply automatically begins to supply gas to the system. Once the switch over occurs and primary source is replaced, the switch over board is reset, such that the reserve supply supplying gas is now designated as primary source and the secondary source is now held in reserve.
The empty cylinder can be replaced without interrupting the gas flow.
What is an automatic switch over board?
An automatic switch over board switches automatically, when the service source is empty, to the reserve source and does not need to be reset to allow reversal of the cycle. A switch over board will reduce the cylinder pressure to an appointed secondary pressure and will insure continuous gas supply from several high-pressure sources.
This reduces the need for continuous operator monitoring and ensures a safe cylinder replacement. When one high-pressure supply source is in service, the others are in reserve. When the service source is empty, the switch over board switches automatically to the reserve source for a continuous gas supply to the process at the same pressure. The empty cylinder can be replaced without interrupting the gas flow.
What is a single stage regulator?
A single stage regulator will reduce the inlet pressure to the outlet pressure in one step. By turning the hand wheel we can adjust the outlet pressure. Due to the design of single stage regulators, the outlet pressure increases as cylinder pressure decreases. The outlet pressure can be readjusted by the hand wheel.
Because of this small pressure rise, single stage regulators are recommended for applications that do not require a constant outlet pressure. Single stage regulators are also recommended for liquefied gas service such as CO2, Propane, LPG, cryogenic gases and other gases that are liquid in the cylinder.
What is a dual stage regulator?
A dual stage regulator is basically two single stage regulators in a single body. This dual configuration provides superior pressure and flow stability vs. single stage regulators.
The first stage is preset to an intermediate pressure. This intermediate pressure acts as the inlet pressure to the second stage, which is adjustable.
Because the pressure has been reduced to the intermediate pressure by the first stage, the pressure feeding the second stage of the regulator remains constant, thereby insuring a constant outlet pressure to the application regardless of cylinder pressure. This technology avoids having to frequently adjust the outlet pressure as the cylinder pressure drops.
Applications would be laboratory, gas chromatography but also in the industry for precision welding.