Flowserve MD-200 Series Durametallic - Manual (Page 5)

5
3 Seal Barrier Gas Supply
The standard MD-200 seal design, using #22 carbon rotor faces, is
engineered to operate with non-humidified gas supplied to the seal
chamber at a consistent pressure 2 bar (25 psig) above the maximum
vessel pressure. Nitrogen gas is the barrier fluid of choice. The gas to be
used, maximum vessel pressure, shaft speed, temperature, equipment
and shaft size must be specified when the seal is ordered.
Note: MD-200 seal designs using #5 carbon rotor faces, still require a
conditioned or humidified barrier gas. Nitrogen gas, humidified with a
polar compound (water), is the barrier fluid of choice.
4 MD-200 Seal Piping
4.1 Install piping for the clean nitrogen to the canister tap. A filter,
pressure regulator, flow meter, check valve and pressure indicator
are recommended.
Note: A conditioner or humidifier is recommended when using MD-200
with #5 Carbon rotor faces.
4.2 Bearings (optional) have been pre-lubricated during seal assembly.
Recommended Piping for Dual Conditioned Gas Seal
Figure 2
Check
Valve
N
Source
Pressure
Regulator
Pressure
Indicator
Bypass
Humidifier
(optional: use only with
#5 carbon rotor faces)
Flow
Meter
Barrier
Gas
Inlet
2
Filter