P.I.C. FG & IG application instructions and suggested engineering specifications

All insulated pipe and fittings should be covered with P.I.C. FG or IG Series jacketing – 20mil (FG 20 – IG 20) or 28 mil (FG 30 – IG 30) thick. All P.I.C. pipe insulation jacketings are provided preformed with an approximate 1 ½" overlap on sizes up to 11 ½" O.D. sizes 12 ½" to 20.0” O.D, 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 P.I.C. Welding adhesive 1/8" in diameter under all overlapping joints and to the outside of overlaps and feather the edge. All longitudinal overlaps are normally solvent-welded with P.I.C. Welding Adhesive. When specified, P.I.C. jacketing may be taped or banded.

Overlap adjacent pipe insulation jacketing approximately one inch and weld all circumferential seams with P.I.C. Welding Adhesive, or as specified. Overlap fitting covers to adjacent pipe insulation jacketing, weld all longitudinal and circumferential seams with P.I.C. Welding Adhesive, or as specified.

Cap off ends with P.I.C. FG or IG 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 O.D. size of the pipe or valve stem and seal with a 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 the 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. In such cases, multi-layered insulation and staggered joints should be considered.

Thermal expansion

In atmospheres where the P.I.C. 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 36 feet, and between fittings if the distance exceeds 10 feet. The degree of the 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.