Plastic-Lined Steel Pipe

Plastic-Lined and Rubber-Lined Steel Pipe. 10-100... 

Lead and Lead-Lined Steel Pipe Lead and lead-hned steel lipe have been essentially eliminated as piping materials owing to lealth hazards in fabrication and installation and to environmental objections. Lead has been replaced by suitable plastic, reinforced plastic, plastic-lined steel, or high-alloy materials. 

Wood and Wood-Lined Steel Pipe Douglas fir, white pine, redwood, and cypress are the most common woods used for wood pipe. Wood-lined steel pipe is suitable for temperatures up to 82°C (180°F) and for pressures from 1.4 MPa (200 Ibhin ) for the 4-in size, through 0.86 MPa (125 IbFin ) for the 10-in size, to 0.7 MPA (100 Ibf/ in") for sizes larger than 10 in. For fume stacks and similar uses, wood-stave pipe with rods on 0.3-m (1-ft) centers is most satisfactory because it permits periodic tightening. In recent years reinforced plastics have supplanted wood pipe in most applications. 

Figure 2-5A. Lined-steel pipe and fittings for corrosive service. By permission. Performance Plastics Products.

The Moody diagram is a general graph for the Darcy factor versus the Reynolds number, It is applicable to a very large number of different pipe materials. There are four principal pipe materials associated with slurry flows plastic pipes [high-density polyethylene (HDPE)], plain steel pipes, rubber-lined steel pipes, and concrete pipes. The absolute... 

Taylor, N. S., Joining Thermoplastic Lined Steel Pipe, ANTEC Conf. Proc., Soc. Plastics Eng., 1994. 

Underground transmission lines are preferred in places where rights-of-way are severely limited because they can be placed much closer together than overhead lines. They are also favored for aesthetic reasons. They may be directly buried in the soil, buried in protective steel or plastic pipes, or placed in subterranean tunnels. The conductors are usually contained within plastic insulation encased in a thin metallic sheath. The conductors enclosed in steel pipes may be immersed in oil, which may be circulated for cooling purposes. For all types of underground lines, the capacitance is higher than for overhead lines, and the power transfer capability is usually limited by the resistive losses instead of the inductance. Wliile not exposed to environmental... 

Appendix A contains a materials selection guide for aerated freshwater systems. As indicated in Note 27 of Appendix A, in freshwater systems, admiralty brass should be limited to a maximum pH value of 7.2 from ammonia and copper-nickel alloys and should not be used in waters containing more sulfides than 0.007 mg/L The materials selection guide is also satisfactory for seawater, although pump cases and impellers should be a suitable duplex stainless steel or nickel-aluminum-bronze (properly heat treated). Neoprene-lined water boxes should be considered. For piping, fiber-reinforced plastic (up to 150 psi [1,035 kPa] operating pressure) and neoprene-lined steel should also be considered. Titanium and high-molybdenum SS tubes should be considered where low maintenance is required or the cost can be justified by life expectancy. 

Tables 19.9 through 19.12 contain comprehensive unit prices and work hours for the fabrication and erection of process and interconnecting piping systems in carbon steel, 304 stainless steel, 316 stainless steel, and plastic-lined carbon steel pipe.

Table 19.14 Comprehensive Piping Units Model Plastic Lined Carbon Steel...

G-lf the pipe line is plastic or steel, this design, although less perfect than F.may be used. It holds the pipe rigidly in place to prevent movement but relies for membrane tightness on the seal at the internal notch so that any leakage at that point can enter the concrete along the shaft. 

---