Mounting, installation and connection
27
BA.10A.CNY.001.01.10.GB
4.6.2 Double mechanical seal - back-to-
back-arrangement
Barrier liquid
In order to continue functioning, the mechanical seals require
a barrier liquid, some of its purposes being:
•
Pressurisation in the sealing space
•
Prevent the feed liquid from penetrating into the sealing
gap
•
Dry-run protection
•
Lubrication and cooling of the mechanical seals.
A pure liquid, compatible with the pumped liquid, serves as a
sealing liquid.
Ensure the functioning in this way:
1. Open feed line of barrier liquid
2. Bleed seal cartridge
3. Ensure liquid is circulating at required barrier pressure.
The barrier pressure should be at least 1.5-2 bar above the
highest pressure to be sealed. The sealing liquid should not
be above 60°C on exit and should on no account exceed the
boiling point.
A pure liquid, compatible with the pumped liquid, serves as a
sealing liquid.
