What happens if Nonel tubing is exposed to ANFO for too long?

• A. The tubing will dissolve
• B. It becomes ineffective due to oil penetration
• C. It increases the pressure within the tubing
• D. It enhances the shock propagation

Answer: (B)

The correct answer indicates that if Nonel tubing, which is commonly used in the initiation of explosives, is exposed to ANFO (Ammonium Nitrate Fuel Oil) for an extended period, it becomes ineffective due to oil penetration. Nonel tubing is typically made from materials designed to withstand certain conditions, but prolonged exposure to the oil component in ANFO can lead to its degradation.

The oil in ANFO can penetrate the tubing material, affecting its integrity and causing it to lose its effectiveness in safely transmitting a detonation signal. This breakdown in performance can lead to complications in controlled blasting operations, where reliable initiation systems are crucial for safety and efficacy.

In contrast, the other choices do not accurately reflect the consequences of such exposure. Dissolving of the tubing would imply a complete breakdown in a chemical reaction that is not characteristic of oil's interaction with the Nonel material. Increasing pressure within the tubing is not a direct result of oil exposure; rather, effective tubing must maintain safe pressure levels to function correctly without risk. Enhancing shock propagation does not occur from this contact; instead, it should hinder effective transmission due to material compromise, making the choice regarding ineffectiveness due to oil penetration the most accurate response.