API API-571

Which of the following materials are generally not suitable for HF service? 

Changing to a more corrosion resistant and/or higher hardness material _________ improve cavitation resistance.

Exposure to high solution strength caustic can result in general corrosion or high corrosion rates above ________. 

Many thermal fatigue cracks are filled with: 

Thermal fatigue cracks usually propagate _______ to the stress and they are usually dagger-shaped.