# Underground Construction - September 2021 - 29

```installation. For pipe constructed from HDPE, the bend radius
limitation of the drill rods is suffi ciently large to be compatible
with that of the product pipe.
FIGURE 2 shows the required setback distance of the drill
rig corresponding to the distances shown in Figure 1 and also
indicates the minimum possible depth for a level trajectory.
Pipe design, selection considerations
Th e guidelines indicate that essentially all the commonly used
wall thicknesses (e.g., DR 7 to DR 17) for HDPE (PE4710) pipe
would be suffi ciently strong to resist collapse for depths to
approximately 15 feet, with the possible exception of DR 17, the
typical limit for mini-HDD installations. A limit of 10 feet may
be more appropriate for DR 17.
Th ese depths assume an empty pipe during the installation
and pre-operational phase, in the absence of internal fl uids
or pressure, which would off set the eff ects of the external
pressure due to drilling fl uid/slurry. For depths greater than
15 feet, thinner wall pipe, or special situations, the adequacy
of the product for the application should be verifi ed using the
information provided in the appropriate appendix.
Th e following equation was developed as a convenient means
of estimating the peak force applied to the pipe as it is pulled
throughout the bore hole:
Tension (lbs) = [Bore Length (ft) × Buoyant Weight (lbs/ft) ×
(⅓ )] × (1.6)n
Th e buoyant weight may be calculated as:
Buoyant Weight (lbs/ft) = ½ [Pipe Outer Diameter (in.)]2
Pipe Weight (lbs/ft)
The parameter n is equal to the number (or fraction) of
90° route bends due to cumulative route curvature, where
n = n1
+ n2. The quantity n1
is the effective number of
deliberate/planned 90° route bends, and n2
is suggested:
is the cumulative
curvature (90° route bends) due to the unplanned undulations.
The following value of n2
n2 = [Bore Length (ft) / 500 ft] × [2-in / Rod Diameter (in.)]
Criteria for selecting an appropriate pipe strength then
corresponds to selecting a DR value with a safe pull tension at least
as large as the estimated tension, as determined above.
Th e safe pull tension for the PE4710 pipe is given below, for
both IPS and DIPS sizes. Th e quantitative values shown are based
on the minimal required wall thickness, as opposed to that of the
actual manufactured product and, therefore, underestimate the
average safe pull tension by approximately 6 percent.
-
STATE OF THE ART, HIGHLY ACCURATE GYRO SPECIFICALLY
DESIGNED FOR HDD
Sharewell HDD is proud to introduce it's newest guidance tool to the HDD industry,
Designed to be compatible with customers standard non-mag bottom hole
assembly, the Opti-Trac Gyro can run in holes measuring 5 7/8 " and larger.
Special projects down to 3 7/8 " pilot hole can also be engineered and
Designed to be compatible with customers standard non-mag bottom hole
assembly, the Opti-Trac Gyro can run in holes measuring 5 7/8 " and larger.
Special projects down to 3 7/8 " pilot hole can also be engineered and
considered.
In addition, each Opti-Trac Gyro has an Integrated Magnetic
ShareTracker system providing secondary position confirmation,
thus eliminating a need for walk-over systems.
In addition, each Opti-Trac Gyro has an Integrated Magnetic
ShareTracker system providing secondary position confirmation,
281.288.2560 | SharewellHDD.com
UCONonline.com | SEPTEMBER 2021 29
1/29/21 1:00 PM
```
http://www.SharewellHDD.com http://www.UCONonline.com

# Underground Construction - September 2021

Contents
Underground Construction - September 2021 - Cover1
Underground Construction - September 2021 - Cover2
Underground Construction - September 2021 - Contents
Underground Construction - September 2021 - 4
Underground Construction - September 2021 - 5
Underground Construction - September 2021 - 6
Underground Construction - September 2021 - 7
Underground Construction - September 2021 - 8
Underground Construction - September 2021 - 9
Underground Construction - September 2021 - 10
Underground Construction - September 2021 - 11
Underground Construction - September 2021 - 12
Underground Construction - September 2021 - 13
Underground Construction - September 2021 - 14
Underground Construction - September 2021 - 15
Underground Construction - September 2021 - 16
Underground Construction - September 2021 - 17
Underground Construction - September 2021 - 18
Underground Construction - September 2021 - 19
Underground Construction - September 2021 - 20
Underground Construction - September 2021 - 21
Underground Construction - September 2021 - 22
Underground Construction - September 2021 - 23
Underground Construction - September 2021 - 24
Underground Construction - September 2021 - 25
Underground Construction - September 2021 - 26
Underground Construction - September 2021 - 27
Underground Construction - September 2021 - 28
Underground Construction - September 2021 - 29
Underground Construction - September 2021 - 30
Underground Construction - September 2021 - 31
Underground Construction - September 2021 - 32
Underground Construction - September 2021 - 33
Underground Construction - September 2021 - 34
Underground Construction - September 2021 - 35
Underground Construction - September 2021 - 36
Underground Construction - September 2021 - 37
Underground Construction - September 2021 - 38
Underground Construction - September 2021 - 39
Underground Construction - September 2021 - 40
Underground Construction - September 2021 - 41
Underground Construction - September 2021 - 42
Underground Construction - September 2021 - 43
Underground Construction - September 2021 - 44
Underground Construction - September 2021 - 45
Underground Construction - September 2021 - 46
Underground Construction - September 2021 - 47
Underground Construction - September 2021 - 48
Underground Construction - September 2021 - 49
Underground Construction - September 2021 - 50
Underground Construction - September 2021 - Cover3
Underground Construction - September 2021 - Cover4
https://www.nxtbook.com/gulfenergyinfo/gulfpub/underground-construction-december-2022
https://www.nxtbook.com/gulfenergyinfo/gulfpub/uc_202211
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202210
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202209
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202208
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202207
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202206
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202205
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202204
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202203
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202202
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202201
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202112
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202111
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202110
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202109
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202108
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202107
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202106
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202105
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202104
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202103
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202102
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202101
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202012
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202011
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202010
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202009
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202008
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202007
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202006
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202005
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202004
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202003
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202002
https://www.nxtbook.com/nxtbooks/gulfpub/uc_202001
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201912
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201911
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201910
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201909
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201908
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201907
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201906
https://www.nxtbook.com/nxtbooks/gulfpub/uesi_summer2019
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201905
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201904
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201903
https://www.nxtbook.com/nxtbooks/gulfpub/uesi_winter2019
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201902
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201901
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201812
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201811
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201810
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201809
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201808
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201807
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201806
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201805
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201804
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201803
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201802
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201801
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201712
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201711
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201710
https://www.nxtbook.com/nxtbooks/gulfpub/uc_ditchwitch
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201709
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201708
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201707
https://www.nxtbook.com/nxtbooks/gulfpub/uc_201706
https://www.nxtbookmedia.com