Seal Gas System QnA

Question

Q – What is the function of the dry gas seal?

2) Q – What is seal gas?

3) Q – What are typical sources of seal gas?

4) Q – What is the function of the separation or barrier seal?

5) Q – What is separation air?

6) Q – Why must seal gas be clean and dry to a very strict specification?

7) Q – Why must separation air be clean and dry to a very strict specification?

8) Q – How is the condition of the dry gas seal monitored?

9) Q – What is the consequence of low seal gas pressure to the dry gas seal?

10) Q – What is the composition of the gas in the primary seal vent?

11) Q – What is the composition of the gas in the secondary seal vent?

This topic was modified 10 months ago by Sahaj Garg

Sahaj Garg · Accepted Answer

Q – What is the function of the dry gas seal?A – To isolate the process gas inside the compressor from the lube oil system and reservoir.2) Q – What is seal gas?A – Pressurized hydrocarbon or inert gas injected at the dry gas seal faces to separate the rotating and stationary portions of the seal and allow it to perform its sealing function.3) Q – What are typical sources of seal gas?A – The compressor discharge header is commonly used because it is under sufficient pressure to provide a constant source of seal gas. Inert gas such as nitrogen may also be used but this tends to be avoided due to cost.4) Q – What is the function of the separation or barrier seal?A – To prevent the migration of bearing housing lube oil into the dry gas seal cavity and to avoid process gas leakage into the bearing oil.5) Q – What is separation air?A – Pressurized air or inert gas injected at the separation or barrier seal to prevent leakage of bearing lubricating oil to the dry gas seal.6) Q – Why must seal gas be clean and dry to a very strict specification?A – Because the seal clearances are very small and any dirt or contamination could damage the seal faces.7) Q – Why must separation air be clean and dry to a very strict specification?A – Because the seal inner carbon rings can be damaged by dirt or contamination causing excessive leakage of oil across the seal.8) Q – How is the condition of the dry gas seal monitored?A – By measuring the pressure and flow of gas in the primary and secondary seal vents.9) Q – What is the consequence of low seal gas pressure to the dry gas seal?A – Dirty unfiltered process gas can overcome the seal gas pressure and migrate from the internal compressor sealing system to the dry gas seal. This gas can then get between the seal faces causing damage.10) Q – What is the composition of the gas in the primary seal vent?A – Typically hydrocarbon gas. If inert gas is used as seal gas, then it will be 100% inert gas.11) Q – What is the composition of the gas in the secondary seal vent?A – A mixture of seal and separation gas meaning it could contain hydrocarbon gas or some combination of hydrocarbon gas, air, and inert gas.

Control Systems [Solved] Seal Gas System QnA

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