ELBOW PATCH.- The elbow patch shown in figure 7-27 is applied using the same basic procedures as the simple patch but with the following exceptions:

1. Slit the edges of the void cover 2 to 3 inches at each end to conform to the contour of the pipe. (See view B of fig. 7-27.)

2. After the impregnated woven roving cloth has been wrapped around the pipe, use your gloved hand to shape the cloth to the contour of the pipe. (See view C of fig. 7-27.)

3. Apply the PVC film and tie it with the chalk line as described for the simple pipe patch. (See view D of fig. 7-27.)

Figure 7-27.-Elbow pipe patch.

SEVERED PIPE PATCH.- The severed pipe patch shown in figure 7-28 is also applied with the same basic procedures as the simple pipe patch. But this procedure also has some exceptions:

1. Where the gap exceeds 4 inches, thin sheet metal or other suitable materials may be used as a substitute for the void cover in bridging the gap. The substitute material should be cut so that it will extend at least 2 inches on either side of the

Figure 7-28.-Severed pipe patch.

gap. It should be long enough to provide one complete turn around the pipe with a possible overlap of about 2 inches. Secure the substitute material with the chalk line.

2. Cut the woven roving cloth so it will extend at least 4 inches beyond the edges of the bridge material. Impregnate the cloth with the resinhardener mixture. Wrap the cloth around the bridge materials and tie it securely as you did for the simple pipe patch.

3. Apply the PVC film and tie it securely with the chalk line as you did for the simple pipe patch.

Figure 7-29.-Compound rupture patch, edges not removed.