PIPELINE PIGS & PIGGING (PIPERS NEED TO READ)

1.1 Tools and Techniques


1.1.1 Description (What are Pigs?)

1.1.2 Function (What do pigs do?)

1.1.3 Description of Pigging Functions

1.1.4 Method (How do pigs work?)

1.1.5 Selection (How do I choose a pig?)


1.2 Pipeline Design Factors

1.2.1 Internal Conditions (Conditions inside the pipe)

1.2.2 Pipeline Specifications (Dimensions & materials)

1.2.3 Fittings & Equipment (Components fitted to the pipe)
 
 
TOOLS AND TECHNIQUES


1.1.1 DESCRIPTION (“What are Pigs?”)


1.1.1.1 OVERVIEW

Pipeline Engineering’s formidable reputation is based on the high specification and

quality of its pigs, traps and related equipment – which have been used to maintain

pipelines world-wide for many years.

But, what is a ‘pig’. The name refers to a mechanical device that can be inserted into

a pipeline and used to carry out pre-defined tasks (depending upon its construction)

at critical points, or along the full length of the pipeline.

Pigs are driven by pressurising the pipeline behind them or, in most cases, inserting

them into the existing product flow, using specialised laundering equipment.

Whilst the potential applications for pigs are limited only by the imagination of the

specifier and the manufacturer, most tasks have now been defined and accepted

design characteristics are used by all the major suppliers.

Pigs and spheres must be suitably equipped to carry out a function or ‘task’. These

tasks are given names (cleaning, gauging, separation, drying, etc.) but the demands

of any individual task may require very different qualities from the pig depending upon

the stage in the development of the pipeline (pipeline development stage) at which

the pig is to be used (construction, pre-commissioning, commissioning, etc.)

Pipeline design factors influence the overall design of the pig and the types of seals

and fittings to be used.
 
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