Page 500 - Trenchless Technology Piping Installation and Inspection

450 Inde x

pilot-tube microtunneling (PTMT) pipe replacement. See replacement
(Cont.): methods
minimum depth guidelines, 31, 34t pipe spitting, 233
operation, 23, 25–26, 25f pipe wall loss, 140
overview of, 23 pipe zone, 121f, 122t
pipe design, 323, 325 PipeForm™ joint, 145, 146t
pipe/soil type and, 35t Pipeline Assessment Certification
surface survey, 327 Program (PACP), 283
pinholes, coating, 303t pipe-ramming method
pipe bursting. See also design advantages of, 38–39
considerations, replacement applications, 33t
allowable forces, 351 bulkhead and, 360
applicability/limitations, 240–241 construction and, 338–339
concept of, 230 description, 26–27, 27f
construction and, 354–355 failure regarding, 360
existing materials and, 236–237 in HDD projects, 27–29
existing pipe renewal/replacement impact moling, 29–30, 31f
and, 52f, 52t, 54t, 56t, 63–64, 64f innovations in, 27–30
failure regarding, 360 inspection guide, 340f–341f
history of, 229–230 introduction, 335
host pipe, 352–353 limitations of, 39
hydraulic systems of, 231–232 main characteristics of, 32t
illustration of, 351f materials, 338
impactor method and, 234, 235, 235f minimum depth guidelines, 31, 34t
insertion/pulling shaft and, overview of, 26
230, 231f pipe/soil type and, 35t
inspection guide, 356f–357f schematic of, 337f
introduction, 350 pipes. See also asbestos cement pipes;
vs. lining, 238 buried pipe; cement-based pipes;
lubrication fluids and, 355 concrete pipes; cured-in-place
materials, 350–354 pipe; ductile iron pipes; fiberglass
methods, 231–233, 354–355 pipe; flexible pipes; glass-
vs. open-cut installation, 239–240, reinforced pipe; metallic pipes;
240f plastic pipes; polyethylene pipe;
pipe dimensions in, 351–352 polymer concrete pipe; polyvinyl
pipe quality and, 354 chloride pipe; rigid pipes; steel
pneumatic systems of, 231, 232f pipe; vitrified clay pipe
project classification, 240–241, 240t behavior of, 129–131, 129f, 131f
replacement methods, 229–233, cast-iron, 172–173, 173f, 230
238–240, 239f, 240f, 350 condition descriptions for, 281t–282t
replacement pipes used in, 353 defects in, 279–280, 280t, 281t–282t,
risks regarding, 41 283, 284f, 285t–286t, 287f
slow, 266–267 failures of, 131–140
static systems of, 232–233, 233f planning for trenchless installation
water mains, 260, 260f and, 376
pipe cleaning methods, 99, 99f, 100t rigid vs. flexible, 122–124
pipe collapse conditions, 272–275, 273t selection considerations of, 140–141
pipe eating, 234, 236 six category condition assessment
pipe reaming, 234, 234f for, 280, 280t
pipe removal soil arching effect and, 127–128, 128f
ejection/extraction, 234, 235–236 pipe-soil interaction
existing pipe renewal/replacement flexible pipe behavior and, 130–131,
and, 52f, 52t, 54t, 56t, 64 131f
impactor method, 234, 235, 235f history regarding, 2–3
insertion, 235–236, 236f load transfer and, 126, 126f
overview of, 233–234 pipe failures and, 131–140
pipe eating, 234, 236 removal/excavation modes and, 35t
pipe reaming, 234, 234f rigid pipe behavior and, 129–130, 129f
types of, 234 soil arching effect and, 127–128, 128f