Issues with the operation of the compressor dry gas seal

Before starting the pump, it is essential to introduce isolation gas first; its purpose is to prevent the lubricating oil from contaminating the main sealing surface. Generally, it is wind. The secondary sealing gas is the same as the primary sealing gas; it is usually nitrogen. The secondary sealing gas is injected inside to protect the main sealing surface and prevent the compressor fluid from contaminating it. The primary sealing gas is injected directly onto the main sealing surface, creating an air film with a thickness of around 3 microns; this constitutes the sealing medium

1. Activate the isolation gas. 2. Activate the secondary sealing gas. 3. Activate the primary sealing gas. Before bringing the system into operation, it is necessary to ensure that the pipeline system has been thoroughly purged and cleaned. It is also essential to ensure that the air used for purification as well as the nitrogen are dry. It is necessary to check whether the filter is dirty and to examine the drainage condition. Check the pipelines, connection flanges, and joints for leaks, as well as the relevant valves for internal leakage. Check the differential pressure of the differential pressure gauge. The sealing system must be put into operation before the lubricating oil system starts, but the lubricating oil pump must not be started when the pressure of the isolation gas is below the specified value.

Many answers were given upstairs, and they were very detailed

For dry gas seals, the isolation gas is activated first, followed by the secondary seal, and then the primary seal. Typically, both the isolation gas and the secondary seal use nitrogen. Filters with a precision of 3 microns are installed in the system. Lubricants used in common chemical processing equipment are employed, and the pressure of the isolation gas is usually around 50 to 100 KP at an oil pressure of 0.25 MPa. The primary seal often uses the medium from the unit itself, with the flow rate typically being controlled while ensuring differential pressure injection. Now, many host manufacturers set the isolation gas pressure as a necessary interlock condition for starting the oil pump; the oil pump cannot be started without the isolation gas in use. The purpose is to protect the dry gas seal from containing liquid and prevent oil from leaking in. Is it clear now with this answer?

Isolation gas, primary seal gas, secondary seal gas.

For different types of seals, the sequence in which gas is introduced varies, but the isolator should definitely be activated first