SJPs can be fabricated from any machinable or weldable material. Typical materials are Low Temp Carbon Steel, Stainless Steel, Duplex Stainless Steel and Super Duplex Stainless Steel. Materials can be NACE certified for sour applications. The internal surfaces can be coated with hard wearing materials such as tungsten carbide, Stellite, etc. or lined with ceramics for erosive duties.