All insulated pipe and fittings should be covered with PIC FG Series jacketing FG-20 (20 mil) or FG-30 (30 mil). PIC pipe insulation jacketings are provided preformed with an approximate 1 1/2″ overlap on sizes up to 11 1/2″ OD, sizes 12 1/2″ to 20.0″ OD have an approximate overlap of 2″, and sizes 21.0″ and larger have an approximate overlap of 3″.
To install jacketing, apply tension to all jacket joints using elastic cord or duct tape to insure even spread of welding adhesive. Then apply a bead of PIC Welding Adhesive 1/8″ in diameter under all overlapping joints and to the outside of overlaps and feather the edge. When specified, PIC jacketing may be applied using other mechanical methods, contact us for more details.
Overlap adjacent pipe insulation jacketing approximately one inch and weld all circumferential seams with PIC Welding Adhesive, or as specified. Install straight coverings over fittings and weld all longitudinal and circumferential seams with PIC Welding Adhesive, or as specified.
Cap off ends with PIC FG Series Caps. Caps are used for unions, reducers, tees, flanges, and valve covers.
Cold or Hot Systems – On cold pipe systems, cut a circular hole in the center of the cap to the OD size of the pipe or valve stem and seal with recommended caulking.
On hot pipe systems, cut a circular hole in the center of the cap 1/2″ from the diameter of the pipe. Place a heat-resistant garlock washer underneath the cap. Apply high temperature caulking on top of garlock washer, between the cap and the pipe.
All hot pipe systems should be properly insulated to prevent excessive temperatures from transmitting to the jacketing surface (see product information sheet). In such case, multi-layered insulation and staggered joins should be considered.
Thermal Expansion – In atmospheres where the PIC jacketing will be exposed to thermal expansion caused by external weather conditions or internal pipe temperature changes, a simple slip-joint should be used on long continuous runs of pipe approximately every 20 to 35 feet, and between fittings if the distance exceeds 10 feet. The degree of temperature variations to which the jacketing is subjected will determine the number of slip-joints needed. A slip-joint should be used between fixed points. A simple slip-joint can be made by extending the overlapping section 6 to 12 inches beyond normal. Use caulking under overlaps to present a weather barrier.