Sequence of putting dry gas seals into operation
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What is the sequence in which the primary seal gas, secondary seal gas, and isolation gas for the compressor’s dry gas seal are introduced, and why is this sequence followed?
First, introduce isolation gas to prevent lubricating oil from entering the dry gas seal； Next, activate the first and second stage seal gases!
It’s a bit late to start the oil pump now, but generally there should be no problems. These days, single-stage dry gas seals are activated only once operations begin. Someone like you should fill it with nitrogen before driving, and then use gasoline. After starting the operation, nitrogen is still used; once the pressure reaches a certain level, the gas source for the primary dry gas seal is then switched to feed gas
Whether you start the oil pump or not, isolation gas must be activated first; it is used to protect the dry gas seal!
First, introduce the shielding gas, which is usually nitrogen. Inject more primary and secondary seal gas. The oil pump can be started only after isolating gas is introduced, and the pressure of the isolating gas must meet the requirements. The secondary seal gas is the gas at the compressor outlet, while the primary seal gas is nitrogen or process gas.
The last edit to this post was made by space ★ Xuan on 2016-10-30 at 11:23. It must be emphasized that isolation gas should be released first before starting the oil station. Regarding the commissioning of stage 1 and stage 2, the vessel is definitely under no pressure before these stages are activated (pressure can only be applied to the vessel after sealing gas is introduced). In a state of no pressure, I don’t think there is any particular order required for stage 1 and stage 2. Usually, the secondary air and the isolation air are on the same line; generally, when the isolation air is activated, it can be considered that the secondary air system is also in operation. If the unit doesn’t have it, and seals are installed solely for testing the oil system, it’s entirely possible to omit the first stage; however, the second stage and the isolation gas are usually part of the same circuit. So personally, I prefer isolated gas, secondary sealing, and primary sealing.