The pneumatic propulsion control system used...

Question 1 / 2066636eef28f7522a1c5200ae

Question 1 of 2066636eef28f7522a1c5200ae

The pneumatic propulsion control system used on your oil platform supply vessel uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper method for lubrication upon reassembly? Illustration MO-0052

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🔍 Key Concepts

• Material compatibility of O-rings with different lubricants in pneumatic systems • Effects of oil-based vs silicone-based lubricants on rubber and on small control ports/passages • Manufacturer/common practice for diaphragm-operated relay valves in clean, dry air systems

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• Look at how many small ports and passages are in the relay valve body—what kind of lubricant could migrate and clog or swell components? • Which lubricant type is typically recommended for rubber seals that must stay flexible, seal low pressures, and not react with dry air or system materials? • Would a completely dry O-ring be more or less likely to wear, stick, or tear in a sliding pneumatic application like the one shown?

✅ Before You Answer

• Eliminate any option that could attack, swell, or soften rubber or leave a varnish/residue in small air passages • Focus on options that are chemically inert to rubber, stable over time, and suited for dry, compressed air systems • Consider standard maintenance practice: relay valves and control valves usually specify a very light film of the chosen lubricant, not a heavy coating

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Question 1 of 20

O-rings should be lubricated with penetrating oil.

O-rings should be lubricated with desiccant powder.

O-rings should be lubricated with a silicone-based grease.

O-rings should not be lubricated by any means.

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Question 1 / 2066636eef28f7522a1c5200ae

Question 1 of 2066636eef28f7522a1c5200ae

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Question 1 of 20

66636eef28f7522a1c5200ae

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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