Pig passage indicator

Pig passage indicator: overview

The pig passage indicator suits all diameters from DN 3", for a service pressure up to ANSI 900 (higher on request) and compliant with NACE standards. Its operating principle relies on a rare-earth magnet with a low-torque actuator; the internal parts are in stainless steel, the seals in metric pitch and the O-rings in Viton (other type on request).

The detector is specially designed to meet the strictest signalling methods. The omnidirectional actuator cannot damage pigs or spheres or be damaged by their passage, and its total freedom of movement allows any mounting position. The flag sets at 90° for greater visibility, reset is automatic and instant, and the absence of moving seals limits leak risks. Of simple, maintenance-free design, it fits easily on existing tappings. Can be used with foam pigs.

What it is for

During a pigging operation, you need to know where the pig is: has it left, has it passed a given section, has it arrived? The passage indicator, mounted on the pipeline, signals the passage of the pig or sphere with a visible flag. It gives simple confirmation that the operation is progressing, and a reference point for locating a stuck pig.

Where to install it

Usually at the launching and receiving traps, and at intermediate points on long pipelines. Its compatibility with foam pigs and its fitting on existing tappings make it possible to equip an installation already in service.

Pig passage indicator: technical specifications

Pig passage indicator: documentation