MJPN-PGAS-3514-PL-CA-001 (Calculation for Pipeline Free Span) Rev. B (REVIEW)

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CALCULATION FOR PIPELINE FREE SPAN Document No.

Rev.

Date

MJPN-PGAS-3514-PL-CA-001

B

01/06/2015

Page 1 of 11

PELAKSANAAN KERJASAMA PENINGKATAN KEHANDALAN JARINGAN UNTUK PENYALURAN GAS WILAYAH PASURUAN DAN MOJOKERTO

Contract No. 055600.PK/HK.02/PMO/2014

B

Re-Issued For Review

A

Issued For Review

RE V

DESCRIPTION

01/06/201 5 04/05/201 5

DATE

IRW

AB

AGK

IRW

AB

AGK

PREPARE D

CHECKED

APPROVE D

CONTRACTOR

REVISION HISTORICAL SHEET

EMPLOYER S PERSONNE L

EMPLOYE R

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

Rev. B

Date 01/06/2015

Rev.

Date

Description

A

04/05/2015

Issued for Review

B

01/06/2015

Re-Issued for Review

TABLE OF CONTENS

Page 2 of 11

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

Rev. B

Date 01/06/2015

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1.

INTRODUCTION.................................................................................................................... 4

2.

OBJECTIVE........................................................................................................................... 4

3.

REFERENCES....................................................................................................................... 4 3.1 Code and Standard.........................................................................................................4 3.2 Project Document...........................................................................................................4 3.3 Other Document..............................................................................................................4

4.

DEFINITIONS........................................................................................................................ 5

5.

DESIGN BASIS...................................................................................................................... 6

6.

MOMENT AND DEFLECTION..............................................................................................7

7.

SPAN ANALYSIS................................................................................................................... 7 7.1 Maximum Span Distance Based on the Maximum Stress............................................7 7.2 Maximum Span Distance Based on the Maximum Deflection......................................8 7.3 Soil Properties................................................................................................................8 7.4 Static Loads Applied......................................................................................................9

8.

RESULT OF SPAN ANALYSIS.............................................................................................10

9.

CONCLUSION...................................................................................................................... 11

10. ATTACHMENT..................................................................................................................... 11

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

Rev. B

Date 01/06/2015

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1. INTRODUCTION PT Perusahaan Gas Negara (Persero) Tbk., intends to execute the PELAKSANAAN KERJASAMA PENINGKATAN KEHANDALAN JARINGAN UNTUK PENYALURAN GAS WILAYAH PASURUAN MOJOKERTO PROJECT which is located at Japanan, Java Island. 2. OBJECTIVE The objective of this document is to define maximum allowable free span to be employed at the PROJECT considering construction, operating and hydrostatic condition. The calculations were performed based on maximum stress and deflection because of static load. 3. REFERENCES 3.1 Code and Standard Maximum free span length calculation shall comply with the following Codes and Standard: ASME B31.3 ASME B31.8 API 5L SNI 3474

Process Piping Gas Transmission and Distribution Piping System Specification for Line Pipe Sistem Penyaluran dan Distribusi Pipa Gas

3.2 Project Document MJPN-PGAS-3514-PL-DS-002 MJPN-PGAS-3514-PS-DB-001 MJPN-PGAS-3514-PS-DB-001

Data Sheet for Line Pipe Design Basis Manual for Proses Prosedur Penyelidikan Tanah (Pipeline and Station) / Soil Investigation

3.3 Other Document Below are the other reference used in this calculation : Sam Kannappan PE Victor Helguero

Introduction to Pipe Stress Analysis Piping Stress Handbook

B

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

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4. DEFINITIONS The following words shall have the meaning indicated when used herein: PROJECT EMPLOYER’S PERSONNEL EMPLOYER

PURCHASER CONTRACTOR MANUFACTURER/SUPPLIER/ VENDOR

Pelaksanaan Kerjasama Peningkatan Kehandalan Jaringan Untuk Penyaluran Gas Wilayah Pasuruan Dan Mojokerto PT. Perusahaan Gas Negara (Persero), Tbk. (PGN) PT. Connusa means PT. PGAS SOLUTION (PGASSOL)/ Contractor. PT. PGAS Solution Means any person(s) named in the Contract as Manufacturer/ Supplier/

Vendor,

or

any

person(s)

appointed

as

a

Manufacturer/ Supplier/ Vendor, for a part of the Works; and SHALL SHOULD

legal successors in the title to each these persons Indicates a mandatory requirement Indicates strong recommendation to comply requirement

with

the

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

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5. DESIGN BASIS Specification of the main pipeline in which the free span has to be calculated and verified is as follows. Table 5.1. Specification of Main Pipeline PARAMETER

SPECIFICATION

Line Pipe Material Grade

API 5L Grade X46 PSL 2

Nom. Diameter

12 inch

Wall thickness

0.5 inch

Distance

Approximately 2 km

Corrosion Allowance

0.0625 inch

Rating

ANSI 300

Design Pressure

720 Psig

Design Temperature

130° F

Maximal Operating Pressure

536 Psig

Operating Temperature (max)

80° F

Fluid

Natural gas 20 year for un-specified component of pipeline system. 50 years minimum for civil work components

Design life

B

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

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6. MOMENT AND DEFLECTION Moment and deflection data for pipe shall be use following table: Table 6.2. Pipe Moment and Deflection for 12" Pipe PARAMETER Moment of Inertia (I) Section Modulus (Z) Deflection

UNIT inch4 inch3 Inch1

Sch XS 56.73 361.64 1.00

The maximum deflection of pipe is assumed to be 1 inch based on Piping Stress Handbook, Victor Helguero (Page 314, the copies of relevant pages is attached in Attachment I). 7. SPAN ANALYSIS Span analysis performed to calculate the maximum allowable span length so that the stress caused by forces

acting on the

pipe

does not cause failure due to

excessive stress (overstress). The maximum span distance will be calculated based on the maximum

stress

and

maximum

deflection.

The formulas

are taken from

Sam Kannappan PE., Introduction to Pipe Stress Analysis (the copy of relevant pages is attached in Attachment II). The formulation and equation obtained depend upon the end conditions assumed. By assuming a straight pipe beam, simply supported at both ends, below equation are obtained. This end condition gives higher stress and sag and therefore results in a conservative span. 7.1 Maximum Span Distance Based on the Maximum Stress Maximum span length based on the

maximum stress is obtained by

equation:

L1 =

√

0,33 x Z x S h w

Where: L1 = Allowable Pipe Span based on Maximum Stress, ft. Z

= Modulus Section of Pipe, in3

using

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

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Sh = Allowable Tensile Stress for Material at Design Temperature, Psi W = Total Weight of Pipe, Ib/ft 7.2 Maximum Span Distance Based on the Maximum Deflection Maximum span length based on the maximum deflection is obtained by using equation

L2 =

√ 4

∆xExI 22,5 x w

Where :

L2 : Allowable Pipe Span based on Maximum Deflection, ft. ∆ : Allowable Deflection, inch I

: Area Moment of Inertia of Pipe, inch^4

E : Modulus of Elasticity of the pipe material at design temperature, psi W : Total Weight of Pipe, Ib/ft The exceptions for calculation are: 1. The piping is in a static state, except for movement induced by temperature changes. Effects of pulsation, vibration, sway, or earthquake are not taken into account 2. Concentrated loads similar to valves are not considered. 7.3 Soil Properties Soil Properties value taken from Prosedur Penyelidikan Tanah (Pipeline and Station) / Soil Investigation Doc. No MJPN-PGAS-3514-PS-DB-001, this soil properties shall be changed with result of soil investigation, after the Soil Investigation Report accepted by EMPLOYER’S PERSONNEL and EMPLOYER.  Soil Density

= ( 24,500 kN/m3 ) / ( 9.8 m/s2) = ( 2,500 kg/m3 ) = 156.07 lbs/ft3

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

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 Backfill Soil Volume = [OD x Depth Cover] + [ 1/2(OD2– A pipe)] x 1 ft (ft3) = [1.0625 x 6.56] + [½ [1.06252 – ( 3.14 x (1.0625/2)”2))] x 1 ft = [6.97 ft2 + 0.1215 ft2] x 1 ft = 7.09 ft3  Backfill Soil Weight

= Backfill Soil Vol. ft3 x Soil Weight (lbs/ ft3) = 7.09 ft3 x 156.07 (lbs/ft3) = 1106.53 lbs/ft

7.4 Static Loads Applied The loads applied for the calculation are the static loads according to the condition of pipe at empty condition, operating condition and hydrotest condition. At empty condition the calculation is not considering the weight of content inside pipe and soil weight above pipe, but in operating and hydrotest, the calculation is considering the content the weight of content inside pipe and soil weight above pipe. Sketch of maximum span length for installation, operating and hydro test condition describe on following picture. Pipe 12” API 5L Grade X46 PSL 2 OD 12.75”

+ L Installation Condition

Pipe 12” API 5L Grade X46 PSL 2+ Content Weight soil OD 12.75”

soi l +

L Operation and Hydrostatic test Condition

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8. RESULT OF SPAN ANALYSIS Parameter of analysis and calculation describe in following table: Table 8.1. Span Calculation for NPS 12 Inch, Wall Thickness 0.500 Inch (Sch XS) DESCRIPTION

SYMBOL

UNIT

Nominal pipe size

NPS

Inch

12

12

12

Outside Diameter

OD

Inch

12.75

12.75

12.75

Inside Diameter

ID

Inch

11.734

11.734

11.734

Wall Thickness

t

Inch

0.688

0.688

0.688

SMYS

Psi

46000

46000

46000

Basic Allowable stress @design Temp.

Sh

Psi

21000

21000

21000

Modulus Elasticity

E

Psi

2.92E+07

2.92E+07

2.92E+07

ρ steel

Kg/m^3

7,850.00

7,850.00

7,850.00

Coating density

ρ coating

Kg/m^3

941.00

941.00

941.00

Coating thickness

t coating

Mm

Specified Minimum Yield Strength

Pipe density

Modulus section of pipe

Z

CASE 1

1.80

1.80

1.80

56.73

57

57

4

361.64

362

362

1.00

1.00

1.00

-

0.90

1,000.00

0.06

62.43

78.70

78.70

24500

24500

2500

2500

Inch

I

Inch

Deflection

∆

Inch 3

ρ content

Depth of soil cover Soil density

CASE 3

3

Area moment of inertia of pipe

Content density

CASE 2

Kg/m 3

lb/ft

Inch ϒ wet

kN/m^3

ρ SOIL

Kg/m^3

-

Bare pipe weight per feet

Wp

Lb/ft

65.45

65.45

65.45

Pipe coating weight per feet

Wc

Lb/ft

1.16

1.16

1.16

Fluid content per feet

Wf

Lb/ft

0

0.05

55.32

Soil weight per feet

Ws

Lb/ft

0

1106.47

1106.47

Total weight (Wp+Wc+Wf+Ws)

W

Lb/ft

66.61

1173.13

1228.40

Ft

76.82

18.31

17.89

(m)

23.42

5.58

5.45

Ft

51.51

25.14

24.86

(m)

15.69

7.66

7.57

Span Based on stress Span based on deflection Note:

(L1) (L2)

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CALCULATION FOR PIPELINE FREE SPAN Document No. MJPN-PGAS-3514-PL-CA-001

1. CASE 1

Rev. B

Date 01/06/2015

Page 11 of 11

: Empty Condition, during construction Pipe weight only 2. CASE 2 : Operational Condition (Pipe weight + gas content weight + soil above pipe weight). 3. CASE 3 : Hydrostatic Test Condition (Pipe Weight + Water Content Weight + Soil above Pipe Weight).

9. CONCLUSION From the result of calculation, the maximum span lengths obtained are: Table 9.1 Summary of Span Calculation Unit PIPE API 5L Grd X46 PSL2 NPS 12 Inch, WT= 0.5 inch

CASE 1 (CONSTRUCTION )

CASE 2 (OPERATING)

CASE 3 (HYDROTEST)

feet

76.82

18.31

17.89

meter

23.42

5.58

5.45

feet

51.51

25.14

24.86

meter

15.69

7.66

7.57

STATIC SPAN

Based On Stress

Based On Deflection

10. ATTACHMENT Attachment I Piping Stress Handbook, Victor Helguero (page 314). Attachment II Introduction to Pipe stress Analysis, Sam Kannapan PE (page 34-35)