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ta9e 2 <br /> 3.0 PRIMER APPLICATION <br /> 3.1 After proper surface preparation, primer shall be stirred and <br /> applied sparingly in a uniform continuous method to the steel <br /> surface and at least 4" onto the factory coating (see paragraph <br /> 6.3.1 for exception). <br /> 3.2 Application may be by brush or roller. <br /> r <br /> 3.3 Primer shall dry to at least tacky consistency before applying tape. <br /> 3.4 No foreign matter shall come in contact with the primed surfaces <br /> prior to applying tape. <br /> 3.5 Priming application shall be limited to that amount of pipe that can <br /> be wrapped during the same workday otherwise the steel must be <br /> reprimed. Repriming may not take place until all dust, dirt and <br /> other foreign matter has been removed. <br /> 3.6 When applying primer for tape with release paper, refer to paragraph <br /> 6.3. 1. <br /> 4.0 TAPE APPLICATION <br /> 4.1 Select the proper width tape for the work (see-Section 1.1). The <br /> tape should be applied by first lapping over approximately one tape <br /> width of the prepared end of the existing wrap. The wrap should <br /> ! continue along the pipe in a spiral fashion. In order to assure a <br /> double thickness of tape at all points, the spiral must lap the <br /> previous spiral by one-half the tape width plus 1/4" (see Figure 6). <br /> 4.2 The tape should be applied with tension to achieve a tightly bonded, <br /> ' smooth wrap, free of wrinkles or voids. Do not overstretch the tape <br /> to the point that its thickness is reduced. Relax the tension on <br /> the last encirclement or at the end of the wrapping strip. For <br /> Polyken 930, prime the entire surface of the underlying pipe or wrap <br /> that will be contacted by the last encirclement of the end of the <br /> tape. Compress the tape firmly around the pipe. This procedure <br /> will reduce the tendency of the tape to pull back or creep. y <br /> Cigarette wraps should be avoided because proper tension usually <br /> cannot be exerted. <br /> 4.3 If the pipe is to be inserted through a 'bore, (cased or encased) the <br /> spiral wraps should be made in the same direction as the insertion. <br /> In addition, the leading end of the wrap sFiould be protected with <br /> Permacel tape to prevent galling of the field wrap. <br /> 4.4 Wrapping techniques have been developed for some standard types of <br /> fabrications as described below. <br /> PG & E Co. OAAwlmG sub v <br /> �► i�+EET Z OF 9 3FIEETZ 086509 b <br />