Page 496 - Trenchless Technology Piping Installation and Inspection

446 Inde x

HAB. See horizontal auger-boring horizontal directional drilling (HDD)
method (Cont.):
haunch zone, 121f, 122t external coating, 199, 199f
hazard assessment, 387–388 fluids, 193–196, 195f, 196f, 342, 343,
HDD. See horizontal directional 347–348
drilling ideal critical pressure and, 222, 223t
HDPE. See polyethylene pipe illustration of generic, 184f
heat cured resins, 283, 288 impactor method and, 234, 235, 235f
heave, 358–359, 377–378 inspection guide, 349f–350f
HEBs. See horizontal earth boring inspection/construction monitoring,
methods 201–203
high-density polyethylene pipe installation elements in, 339, 341, 343
(HDPE). See polyethylene pipe installation loads, 197–198
high-pressure water jetting, 100t main features of, 19t, 32t
hole in liner, 304t manuals/guides for, 227
holes, pipes with, 284f Maxi-HDD considerations, 186–203
horizontal auger-boring method method description, 184–185, 184f,
(HAB) 185f, 346–347
advantages of, 36, 331 Mini-HDD calculation
allowable forces, 332–333 simplifications, 219–223
applications, 33t Mini-HDD considerations, 203–216
bulkhead and, 360 minimum depth guidelines, 31, 34t,
carrier pipe and, 332, 334 345–346, 345t
casing pipe, 333–334 operating (service) loads, 198–199
casing spacers, 334 operations, 188–191, 190f, 191f,
construction and, 334–335 203–205, 204f
failure regarding, 360 overcut allowance, 347
inspection guide, 336f–337f overview of, 16, 18, 183–184
introduction, 330–332 pilot borehole phase, 188–189, 190f
key components of, 16, 32t, 331 pipe collapse and, 219, 222–223,
limitations of, 36–37 223t, 225
materials, 332–334 pipe load calculations, 216–226
minimum depth guidelines, 31, 34t pipe locating/tracking, 348
pipe locating/tracking, 335 pipe material standards, 344–345
pipes used in, 332 pipe/conduit constraints, 207
pipe/soil type and, 35t pipeline fabrication, 187f, 193
presurvey, 331–332 pipe-ramming method and, 27–29
schematic of, 17f pipes used in, 205, 343–344
uses of, 15–16 pipe/soil type and, 35t
horizontal directional drilling (HDD) planning, 205–207
additional path curvature, 221–222 postinstallation and, 344
advantages/limitations of, 37 preconstruction, 341
applications, 33t preream phase, 189, 190f
bore path entry/exit, 192, 192f procedures of, 18, 20, 21f
bore path layout/design, 208–216 product pipe specifications, 196–199
buoyant weight and, 222 project considerations for, 183–227
calculation applications, 224–225 pull force and, 217–219, 217f, 219f,
considerations, 203–205 220–221, 224, 224t
construction and, 345–348 pullback phase, 189, 191, 191f
contractual considerations, 200–201 quality assurance/control, 341–344
cost estimation/bidding in, 43, 43t reamer diameters and, 20t
depth of cover, 192 site investigation requirements,
design example, 225–226 186–188, 187f
downhole equipment and, 342 specifications/drawings, 199–200
drilled path design, 191–193 steering assemblies, 185, 185f
drilling rig, 193 subsurface survey, 187–188
drill-rod constraints, 205–207, 206f surface survey, 187
drill-rod radius of curvature, use of engineers in, 184
192–193 watertight joints and, 347