Foam pigs are molded from open cell polyurethane foam pigs (either TDI or MDI & ester or ether based) with various configurations of solid polyurethane strips and/or wire bristles, studs, etc., which are permanently bonded to them. Foam pigs are available in sizes ranging from ½” to 72”.
Foam pigs are widely used in the pipeline industry, especially for rehabilitation work. They are also particularly useful when developing a pigging programme for a line which has not been regularly pigged & which may contain some unexpected problems.
Being of cylindrical shape, they have contact with the wall over their entire length & this reduces the unit loading.
Low Density Bare Foam Pigs - Wiping or Drying Pigs
The low-density bare foam pigs are fully bare without any coating on the surface & have only coating with PU elastomer at the bottom or are covered with Rexene fabric depending on the end use. Low density is a range from 16 to 32 kg/cbm (1 to 2 lb./cu ft)
Medium density bare foam pigs are of medium density – 80 to 96 kg/ CBM (5 to 6 lb./cu ft) and are used for regular wiping & dewatering.
This medium density foam provides excellent wear resistance and can shall be used for long distance wiping or dewatering applications.
High density foam pigs are made out of PU foam pigs with density ranging from 128 to 160 kg/CBM (8 to 10 lb./cu ft). They are used for heavy wiping & dewatering and heavy duty applications with excellent wear resistance.
Ultra-high density foam pigs are made out of PU foam pigs with density ranging from 240-320 kg/CBM (15 to 20 lb./cu ft) which provides excellent wear resistance and can be used for long distance wiping heavy wiping & for removing the dense deposits of scale.
Bare Foam Pigs
Bare foam pigs are made with medium density - 80 to 96 kg/CBM (5 to 6 lb./cu ft)/ high density - 128 to 160 kg/CBM and are used for regular wiping & dewatering.
This foam pig is coated on the surface with polyurethane elastomers & is used for heavy cleaning & dewatering
Fully Coated Foam Pigs
This medium density foam pig is fully coated hence provides excellent wear resistance and can shall be used for long distance wiping or dewatering applications.
Criss Cross Coated Foam pigs
The coating on this pig is made in a criss-cross pattern. The pig is used in regular cleaning & dewatering applications.
This foam pig is coated on the surface with polyurethane elastomers in a criss cross pattern & is used for heavy cleaning & dewatering.
Silicon Carbide Strip Pasted Foam Pigs
Silicon Carbide Strip Pasted Foam Pigs: This pig surface is coated with polyurethane elastomer & strips of silicon carbide abrasive are pasted on the surface for tight bonding. It is used for heavy scraping of the scales from the pipeline internal diameter.