Technical Info, and Advise for Operators
This page will be expanded and updated continuously.
Oxygen is a “fast” gas and is selectively diffused (permeated) through the membrane wall while nitrogen is allowed to travel along the inside of the fiber, thus creating a nitrogen rich product stream.
The oxygen enriched gas, or permeate, is vented from the membrane separator at atmospheric pressure, while the nitrogen is piped from the outlet for further pressure and flow controll.
The Oxygen content in the produced nitrogen, is mainly a factor of feed-air pressure and nitrogen flow. But temperature also have some influence.
-Increasing the flow rate will increase oxygen content in the product gas.Higher nitrogen flow, higher oxygen content.
-Decreasing the flow rate will decrease the oxygen content in the product gas.Lower nitrogen flow, lower oxygen content.
-Feed Air pressure increases the productivity of the membranes.
The relationship is illustrated in the following graph:
This relationship is important to keep in mind when troubleshooting a system that deviate from original spesifications. It could be as easy as adjusting feed-pressure or flow. Knowledge to this could save time and frustration to a system that could need re-tuning.
Failure due to ignoring maintenance can be very expensive. Damage to cargo, delayed discharge, reduced discharge rate; Unnecessary COST.
Membranes are the heart of our systems, and they do not require maintenance.
However, there are safety devises and several other components in the system for treating the air, controlling flow, measuring oxygen; and most of these components need some kind of maintenance.
The key-factors are RELIABILITY and COST. Our systems are designed for easy and reliable operation, at all the times. Ignoring maintenance will weaken the reliability-factor, and at one point there will be a failure.
Below you will find memos, technical info etc. that can be of interest to operators of our nitrogen systems.
(PDF) Insp. & Maint. schedule for Small and Medium N2 Generator Systems
(PDF) Insp. & Maint. schedule for Large Cap. N2 Generator Systems
(PDF) Std. Insp. & Maint. schedule for TMC Feed Air Compressor
(PDF) Insp. & Maint. schedule for TMC Feed Air Comp. w yr. run time below 700 hr
(PDF) Insp. & Maint. schedule for TMC 7-27 Feed Air Compressor
(PDF) Insp. & Maint. schedule for TMC 86-124 Feed Air Compressor
(PDF) Technical Notification 03-20 Std. Insp. & Maint. schedule for Kaeser Feed Air Compressor ASD-FSD
Air Products AS Marine Nitrogen systems use TMC Compressors due to their quality, reliability and support.
Below is a collection of useful Technical Bulletins regarding TMC Compressors:
(PDF) Checks to prevent oil carry over
(PDF) Oil level Compressors below 90 kW
(PDF) Oil level Compressors from 90 kW
(PDF) Pressure release before maintenance
(PDF) Oil and Lubrication Recommendation for TMC Compressors
(PDF) Service Chart for compressors with yearly running time below 700 hours
(PDF) Instruction to avoid condensation in oil circulation
(PDF) Water and Running temperature
For Compressor spares, contact our After Sales dept. at: aftsskrs@airproducts.com