What Is a Dry Gas Seal?

Dry gas seals, or "dry running gas seals" (dry running gas seals), are a new type of shaft end seals that use slotted seal technology for gas seals, and are non-contact seals.

When a dynamic ring with a fluid dynamic pressure groove is opened outside the end face

The dry gas seal was adopted on the basis of gas dynamic pressure bearings in the late 1960s.

Application of dry gas seal on P2202 A / B pump: P2202 A / B pump is a low-temperature methanol flushing device of the fertilizer department of Sinopec Anqing Branch

P2202 A / B Pump Original

The P2202 pump dry gas seal has been put into use since October 2008, and the operation is good, and all technical parameters are within the control range.

The P2202 pump dry gas seal control system can still be improved:

(1) Because the medium of the methanol washing device contains a lot of impurities, the pre-buffer of the P2202 pump has only one filter. When it is blocked, the filter must be shut down to clean the filter. It is recommended to use two filters, one open and one in parallel. When one filter is blocked, it can be switched to the other without stopping the machine. You can also add a large coarse filter in front of the filter to delay the filter. Clogged.

(2) A pressure gauge should be installed at the balance tube of the P2202 pump and behind the buffer orifice plate. The adjustment of the buffer fluid and the main seal gas pressure can be adjusted to dry gas sealing according to the values of these two pressure gauges. The desired ideal state ^[3] .