Under what conditions is insertion ultrasonic flowmeter the preferred choice?

Thick-walled pipelines
When pipeline wall thickness exceeds the allowable range for external clamp-on type (e.g., metal wall thickness >50mm, non-metal >100mm), severe sound wave penetration attenuation occurs. The insert type directly contacts the fluid to avoid wall interference.

Pipelines with complex linings/coatings
For pipelines with uneven linings (e.g., peeling rubber layers), thick coatings, or scaling, which cause chaotic signal reflection in external clamp-on type, the insert type probe extends directly into the fluid to reduce wall interference.