Abstract: A pollution control system for reducing the presence of fine aerosol particles in stack gases from the manufacture of glass fiber wool-type products. After larger particles are removed from the forming fan gas, the gas is fed into a centrifugal fan and massive quantities of water are injected into the fan intake. The aerosol particles are agglomerated by impact with the airborne water droplets and the wet surfaces of the fan. The larger, coalesced or agglomerated particles are more readily susceptible to inertia-type separation from the air by either the action of the fan or in a later separation operation.

Abstract: A pollution control system for reducing the presence of fine aerosol particles in stack gases from the manufacture of glass fiber wool-type products. After larger particles are removed from the forming fan gas, the gas is fed into a centrifugal fan and massive quantities of water are injected into the fan intake. The aerosol particles are agglomerated by impact with the airborne water droplets and the wet surfaces of the fan. The larger, coalesced or agglomerated particles are more readily susceptible to inertia-type separation from the air by either the action of the fan or in a later separation operation. It has been found that 1.5 or more gallons per minute (gpm) of injected water per thousand standard cubic feet per minute (scfm) of forming gas passing through each fan is effective to remove more than 40% of the fine, aerosol particles introduced into the fan and even larger amounts of water remove greater amounts of such particles.

Abstract: A sandwich wall for pipes, tanks, and the like fluid confining uses, wherein concentric inner and outer glass fiber reinforced plastic skins or shells are separated from one another by essentially radial ribs integrated into the shells to form a monolithic construction. The ribs are of limited axial extent and are separated from one another by rib forms of substantially greater axial extent, the rib forms functioning essentially as spacers without otherwise materially contributing to the strength or rigidity of the structure. The ribs are composed of essentially the same resinous material as the shells plus a filler, which typically can be chopped glass fiber strands, sand, or other particulate material, glass fiber mat or woven fabric, glass flakes, or mixtures of such materials. The ribs may be either helical and continuous throughout the axial extent of the wall or annular and independent of one another. Various methods of making such sandwich wall structures are also disclosed.