Steam power plant piping system; their design, installation and maintenance

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...the form, A, is made up of plates connected by handles in the shape of an inverted U. In beginning the work the trench is first dug, then the pipe, B, is screwed together and placed in approximately its final position. The metal form is then set about the pipe as shown in the drawing, and the space outside of the form filled with dirt, while the inside of the form is filled with concrete to encase the pipe. As soon as the concrete and dirt have been rammed the form is withdrawn and the trench then loose filled up to the point, D, at the bottom of the planking. With this type of construction old pipe may be used, as it is surrounded by concrete through which no water can leak. The work can be carried on even when the trench is wet, as the pipe may serve to lead away the water during the progress of the work and the concrete can be placed in water. Two or three of these portable forms are required so that they can be moved ahead as the work advances. The most satisfactory method of executing the work shown in Fig. 214 is to build the suction well before disturbing the outside ground. With this well in operating condition the trench can be dug from the well toward the waterway and the pipe laid as fast as the dirt is removed. This will allow the water in the trench to drain to the well, from which it can be removed by the regular pump or a temporary one. It is important that the joints in the pipe be tight if they are to be encased in concrete, as water passing through the fresh concrete to the inside of the pipe will wash out the cement and leave only the loose material. Further discussion of this subject as considered for large suction mains will be found under the heading "Condenser Intakes--Class I." Many suction lines are provided with foot valv...