ops env

8/9/2019 OPS ENV

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OPERATING ENVELOPE

8/9/2019 OPS ENV


PIPELINE ASSET

made up of oil and gas pipeline that evacuates

processed crude from process plants from variouselds to the terminal , gas plant and customerreceiving facility .

Pipelines are operated as networks

PIPELINE Assets EA!N"!L# $%&ars 'recently upgraded due to theNew N"!L !NP# (E)A!E( *)+ $%-A)#/&arsE"!L 'Eastern coastal !runkline0-NA1 supply system

E11 2!E1!3 supply systemEastern (omgas system

PIPELINE Assets 4est !)P# rated at 56&ars !EP# $/ &ars-!L#$/&ars %

8/9/2019 OPS ENV


OPERATING ENVELOPE (OE)WHAT IS OESpecifes the operating liits o! all inter"fel# pipeline an#ens$re that the% are operating as specife#&

+E is dened &y Asset design and overall integrity status of eachnetwork as reported in the pipeline annual integrity report.

The OE #oc$ent "

(ene technical safe limit of all pipeline facility Provide essential input to P(" *acility reference document Provide &asis for revision and update of pipeline operating

strategies and procedures Provide &asis for auditing facility pressure trip setting and

compliance .

8/9/2019 OPS ENV


OPERATING ENVELOPE !ypical temperature is 5%dgr "

-sw 6%7#%/7

*low velocity is the function of 8ow rate and pipe diameter'typically ranges &etween 3.%m9s : 6.%m9s 0

;6 is not e<pected

1iven the aged and varied eld life of most elds in P("onshore, changes in the operating envelop of the pipelinehave to &e monitored to ensure that the asset integrity andprocess safety is maintained.

!he A+P of operated pipeline are derived from thedesign 9integrity status while the +P is set at ma<imum=%7 of the A+P, These paraeters !or theoperating en'elop o! each pipeline asset&

8/9/2019 OPS ENV


P SSTE*+,PIAVAILA-ILIT

econdary &arrier to mitigate against e<ternal corrosion in &uried steel

infrastructures including &uried pipelines. "P system is a critical element in the integrity of the pipeline network, thus

"P system availa&ility and uptime is monitored fre>uently 'monthly cpmonitoring, $ monthly "P surveys etc0

"P system ?PI is set at ==7 with assurance of voltmeter and output readingfrom the !) system and e@ectiveness range of ./01' an# "2201' pipe#to#soil potential

8/9/2019 OPS ENV


HE*IAL IN3ETIONSTRATEG

"hemical Inection is used to mitigate against the corrosive e@ect of the

production . Internal corrosion is a maor threat to the integrity of ourpipelines As recogniBed &y PI.

"hemical inhi&itors and &iocides are inected at specied rate into thepipeline network at strategic points.

Pre and post inection sampling are done to monitor 9trend certain parameterthat indicate the e@ectiveness of the corrosion inections within a speciedcontinuous inection period.

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