What inspection technique is often utilized for identifying surface blisters effectively?

Assisted visual inspection with bright lighting is vital for identifying surface blisters effectively. This technique enhances the visibility of surface anomalies, such as blisters, which can occur due to internal corrosion, material degradation, or other factors. The bright lighting allows inspectors to better see irregularities on the surface that could indicate problems beneath. This method is straightforward, relies on the observer's ability to detect visual signs, and does not require specialized equipment.

The other techniques mentioned might serve specific purposes in the inspection of pressure vessels, but they are not primarily designed for detecting surface blisters. Compressive testing may evaluate material strength or properties under load but does not focus on surface defects. Magnetic measurement is used in specific scenarios, particularly for identifying flaws in ferromagnetic materials, but it is not the first choice for visible surface blisters. Vapor phase corrosion inspection is mainly utilized for assessing corrosion in environments where vapor phase conditions exist and is less effective for visually identifying surface blistering.