7/25/2019 HDD Design and Methodology

1/14

Trenchless Engineering

TABLE OF CONTENTS

DESIGN & ENGINEERING CALCULATIONS - IVONDRO RIVER

S.No. Description

A Purpose

B Project Description

C Reference Specification

D Specifications details

E Design & Engineering-IVNDR Ri!er

Introduction

Pipe "eig#ts

Stress Anal$sis%t#er calculations

Coating Stress

Pulling Capacit$

Proposed Profile

INTRODUCTION

A. Purpose

PA'E (

7/25/2019 HDD Design and Methodology

2/14

Trenchless Engineering

The purpose of this document is to provide and implement the calculations and results

pertaining to certain clauses contained in SNCL Specifications Laying of Pipeline

!"o#g! $o"i%onal Di"eional D"illing' a"o(( I)on*"o Ri)e" fo" A+,ao)y

Niel Sl#""y Pipeline P"o.e

B. Project Description

Laying of pipeline through Horizontal Directional Drilling across Ivondro River is a

proect consisting of the installation of a !"#$! mm %$D$ pipeline &eneath Ivondro

River Crossing using the horizontal directional drilling method$ The !' %$D Steel

conduit shall &e pulled in the separate hole and ( ) *" mm %D HD+E shall &einterducted in steel pipe for %,C after pulling $The pipeline shall &e Steel +ipe of -+I

*L . /"0 1ith a 1all thic2ness of 33$#34 mm$ The e)ternal corrosion coating on the

pipeline 1ill &e three layers +olyethylene$

C. Reference Specification

/0 AS1E B 2/03

DESIGN & ENGINEERING CALCULATIONS -IVONDRO RIVER4355 P"o*# Pipe in !ole of 2655 *ia07 Leng! 8 9/6 +

D. Specifications Details

+ipeline Size 5 !"#$! mm 6(7'8 %$D$ 1ith 33$#34 mm 9$T$

PA'E )

7/25/2019 HDD Design and Methodology

3/14

Trenchless Engineering

Conduit 53!: ;; C$S$ER9 +I+E IS< 4*:#=(""3 >R44"?73"$

!$7 ;; 9$T$

HD+E Conduit 5 ( Nos$ *"mm %$D . 7$" mm

+ipeline ;aterial 5-+I *L >rade . /"

-nti Corrosion Coating 5 4 Layer +olyethylene Coating for (7' pipe$

@oint Coating 5 DIR-. Sleeves of ;?s Raychem

E. Design and Engineering-IVONDRO

Length of Crossing 5 #3! ;eters

;a)imum Depth of +rofile 5 (* ;eters

/0: INTRODUCTION

The follo1ing calculations e)amine the stress imposed on a pipeline during the installation of

a horizontal directionally drilled crossing prior to pull&ac2 during pull&ac2 and post

installation to confirm that the pipeline 1ill not fail$

The calculations are &ased on the follo1ing 5 9e) L ) ,c

+ull ,orce 5 44$3: Tones

Tensile Stress =Se>5 +ull ,orce? -p

Tensile Stress 5 37$**4 N?mm

Ten(ile S"e(( -Do 5 9de) L ) ,d K ) 6%D($ ctt8 ) ,dd) L

+ull ,orce 5 !7$!/ ;T

Tensile Stress =S*e> 5 +ull ,orce? -p

Tensile Stress 5 (:$7 N?mm(

303 $oop S"e((

E?e"nal P"e((#"e Ba(e* On e?pe"i+enal +ea(#"e+en( fo" Benonie

E)ternal +ressure 6+e)t8 5 3$* ) Depth of +rofile 6D8 ) Fentonite Density 6D&8

5 7*"""$"" 2g?m

PA'E /

7/25/2019 HDD Design and Methodology

9/14

Trenchless Engineering

Hoop Stress E)ternal 6She8 5 +e)t ) %R ? 9 t5 = 33$(# N?mm

Longitudinal Stress6Sle8 5 v ) Hoop Stress

5 =4$4# N?mm

$oop S"e(( @ P"e $y*"o Te(

Hoop Stress=S!> 5 +pre ) %R ? 9 t

54#3$7! N?mm

Longitudinal Stress =Sl>5"$* ) 6Sht8

5 3#*$/4 N?mm

$oop S"e(( @ Po( $y*"o Te(

Hoop Stress=S!p> 5 +post ) %R ? 9 t

5 (:#$3( N?mm

Longitudinal Stress =Slp>5 "$* ) 6Shp8 5 377$*! N?mm

SU11AR

ON SIDSON CONVEERS

OVERBENDDURING PULL BAC

DO;N$OLE

INSTALLED

P"e Te( E+py E+py Po( Te(

-)ial Tangential -)ial Tangential -)ial Tangential -)ialTangentia

l

Spanning (7$4 #$:=(7$4 =#$:

Curvature !7$"3 !7$"3 !7$"3

PA'E 0

7/25/2019 HDD Design and Methodology

10/14

Trenchless Engineering

=!7$"3 =!7$"3 =!7$"3

Tensile 37$! (:$7

Hoop E)t$ =4$4# =33$4 =4$4# =33$4

Hoop

+re Test 3#*$/ 4#3$*

Hoop

+ost Test377$! (:#$3

Total

6+ositive8(("$" 4#3$* ::$4 "$"" #($7 "$"" (":$! (:#$3

Total

6Negative8=(7$4 "$"" =/4$: "$"" =!/$7 =33$4 =!/$7 =33$4

Com&ined

stress

Mon ;ises

7"7 :: 3"" 4(:

6>reater

of a&ove 87"7 :: 3"" (3!

-s

S$;$$S$ O:4$:O 3:$4O ("$7O !:$" O

Co!ined stress " ##S $%&S%%' - #S$( S%'' #Von )ises* E+uation'

COATING STRESS

0/ In"o*#ion

This section provides the analysis and results in regard to rePuirement of coating

stresses0 1hich rePuires the determination of certain parameters and the resultant

anticipated ma)imum shear stress0 1hich may &e e)erted upon the pipeline corrosion

coating$

,or proposed Crossings the follo1ing parameters apply