Manual for PID Preparation

7/25/2019 Manual for PID Preparation

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VIETSOVPETRO

RESEARCH AND ENGINEERING INSTITUTE

FOR OIL AND GAS

MANUAL FOR P&ID PREPARATION




Doc. No

Rev. No A

Page 2 of 34

A Issued For Review dd/mm/yy

REV. DESCRIPTION DATE PREPARED CHECKED CHIEFDEPART.

APPROVED

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Rev. No A

Page 3 of 34

TABLE OF CONTENTS

I. OBJECTIVE

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Rev. No A

Page 4 of 34

The purpose of this document is to define the rules which have to be followed to prepare PID's, in thabsence of specific requirements on the subject from Client in the Contract. hen such requiremen

e!ist, the" have to be followed, and the present document shall be modified accordin#l".

II. INFORMATION TO BE INCLUDED ON PI&D

$ll information to be shown on P%IDs shall include at least those reported below&

1. EQUIPMENT

a Items and service description( b elevation of bottom tan#ent line for vessels, towers, condensers and re)boilers(

c main internals of vessels and towers, *demisters, coils, pac+ed sections, vorte! brea+ers, t"

and number of tra"s, etc.(d details for pumps on process PID's, such as& warm)up pipin#, strainers, casin#, vents and drain

coolin# water arran#ement, flushin# facilities, for au!iliar" lines, etc.(

e lube and seal oil facilities for compressors, turbines and blowers(

f fuel arran#ement for heaters and boilers on a separate process PID(# snuffin# steam and deco+in# facilities for heaters(

h pur#in# of equipment and associated lines on process PID(

i listin# of equipment( j main equipment characteristics *at the issue for construction(

+ e!ternal finish code *tracin#, insulation.

2. INSTRUMENTATION

a "mbols in accordance with I$ tandards -. /I0T12340T 53678

$0D ID40TI9IC$TI70/( b all instrument loops and au!iliar" components(

c clear identification of software lin+a#e and alarm shut)down lo#ic s"stems(

d anal":er loop details(e control and safet" valves accordin# to sections III !n" IV respectivel".

#. PIPIN$ FOR PROCESS AND UTILITIES P&ID%S

a 8ine number accordin# to section VI( b description of process product enterin# or leavin#(

c continuation reference to subsequent drawin#(d utilities lines identification *as per section V(

e pipin# specialt" items *blinds, strainers, sample connections, car sealed or loc+ed valves, etc.

f indications for pipin# arran#ement, such as& slope, min.;ma!. distance, h"draulic seals, etc.(# t"pes for all isolation valves accordin# to process requirements and pipin# specifications(

h utilit" stations and safet" showers(

i process drains and vents( j insulation, heat tracin# and jac+etin# arran#ements.

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Rev. No A

Page 5 of 34

. MISCELLANEOUS

a ewa#e indications *white, oil", chemical( b limit of suppl"(

c utilit" distribution drawin#s *#eo#raphical arran#ement accordin# to plot plan.

III. LIST OF PLANT & UNITS

The subdivision of the project into plants and units shall be done in accordance with the Project 6as

Desi#n Data.

IV. LINES NUMBERIN$ S'STEM

1. Unit n()*e+, see 0ote .

2. P+ocess !n" (ti-it -ines s/!-- *e i"enti0ie" * t/e 0o--oin n()*e+in sste)

<< << <<<< <<< <<<< <<

Insulation Code

*ee table =

Pipin# class*ee table >

equential line number *Three *?= di#its, see 0ote >

2nit 0umber % P%ID number*9our *?@ di#its, see 0ote

9luid identification code*ee table

8ine diameter

E3!)4-e, ?A ) C7 B >?? B ?? B CC ) I4

NOTES,

. The first two di#its are the unit number. The last two di#its are the last two di#its of P%IDs number.

all cases, the unit number is mentioned inside P%IDs title bloc+, line list, isometrics and bill materials.

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Rev. No A

Page 6 of 34

>. The sequential line number is ta+en as below&

• Process lines from ?? up to >

• 2tilities lines from =? up to =

• 9ire)fi#htin# lines from @? up to @

• team lines from -? up to E

• 4quipment ancillaries % 2tilit" stations lines from F? up to

Table B 9luid Identification Codes

P$ Process Gas

PL Process 8iquid

CO Condensate

5I ater Injection

C6 Chemical

UA 2tilit" $ir

IA Instrument $ir

RL 1elief

BD 6low down

CD Closed Drain

OD 7pen Drain

VT Hent

Table > B 9luid Identification Codes *0ote

No Pi4in C-!ss

ASME

R!tin M!te+i!-

Co++osion

A--o!nce 7))8 Se+9ice

$C -? Carbon teel =.?J"drocarbon 8iquid and G

Ja:ardous 8iquid Drain

> $C> -? Carbon teel =.? 4!haust Gas

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Rev. No A

Page 7 of 34

No Pi4in C-!ss

ASME

R!tin M!te+i!-

Co++osion


= $C= -? Carbon teel =.?8iquid Drain, 8ube 7il, 9u

7il

@ $C0 -? ?;? Cu0i ?

9ire ater, ater 9oamprin+lin# "stem, 9oam

4!tin#uishin# "stem, at

prin#+lin# "stem

- $C- -?Carbon teel

*Galvanised.K ashin# ater

K $CK -?Carbon teel

*8ow Temp.=.? J"drocarbon 8iquid and G

E $ -? =K8 ?Compressed $ir, Chemical

Injection *8ow Pressure

F $PP -?Pol"prop"lene

1andom*PP)1? ashin# ater "stem

$PH -?Pol"vin"l Chloride

*PHC? ewa#e "stem

? 6C =?? Carbon teel =.? J"drocarbon 8iquid and G

6C- =??Carbon teel

*Galvanised

=.?93)>?? 9ire 4!tin#uishin#

"stem

> CC K?? Carbon teel =.? J"drocarbon 8iquid and G

= DC ?? Carbon teel =.? J"drocarbon 8iquid and G

@ DCK ??Carbon teel


- D ?? =K8 ?.? Chemical Injection

K 4C -?? Carbon teel =.? J"drocarbon 8iquid and G

E 4CK -?? Carbon teel*8ow Temp.

=.? J"drocarbon 8iquid and G

F 9C >-?? Carbon teel =.? J"drocarbon 8iquid and G

9C> >-?? Carbon teel =.? Injection ater

>? 9CK -??Carbon teel


> 9 >-?? =K8 ?Chemical Injection

*Ji#h Pressure

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Rev. No A

Page of 34

No Pi4in C-!ss

ASME

R!tin M!te+i!-

Co++osion


>> GC $PI -??? Carbon teel =.? J"drocarbon 8iquid and G

>= JC $PI ???? Carbon teel =.? J"drocarbon 8iquid and G

Notes,

. The available codes can be increased followin# the project requirements.

Table = B Insulation codes *0ote

CODE T'PE

A $coustical insulation *0ote >

6 Jeat Conservation

E 4lectrical Tracin#

IJot;Cold insulation *Personnel

Protection

J Lac+etin#

P Paintin#

S team tracin#

U 2n)insulated Tracer

C $nti)condensation

F $nti)free:in#

O Jot oil tracin#

Notes,

. The available codes can be increased followin# the project requirements.

>. 2se code MAA in second position when other insulation is required.

V. UTILITIES INDENTIFICATION

1. A-te+n!ti9e 1

The utilities shall be identified b" codes in accordance with the followin# table.

Table @ B 2tilities Identification

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Rev. No A

Page ! of 34

No. Desc+i4tion Co"e No. Desc+i4tion Co"e

9ire ater 9 @ 8P Condensate 8C

> ervice ater - 69 6

= Coolin# ater C K 2tilit" $ir I2

@ Potable ater P E Instrument $ir I$

- Deminer. ater D F 0itro#en IG

K Treated ater T Jot 7il J7

E Nuench ater N >? 9uel 7il 97

F JJP team JJ > 9uel Gas 9G

JP team J >> Jot 6lowdown J6

? 3P team 3 >= Cold 6lowdown C6

8P team 8 >@ Closed Drain CD

> JP Condensate JC >- 7pen drain 7D

= 3P Condensate 3C >K Hent HT

VI. PIPIN$ & INSTRUMENT S'MBOLS AND LE$END

The pipin# % instrument "mbols and 8e#end to be used for P%IDs preparation are specified for

each particular project and will be shown in the drawin#s MP%ID ) "mbols and 8e#endA of the project.

VII. VESSELS AND TAN:S

• 2nless otherwise dictated b" process requirements, vessels connections shall be minimi:ed b"

installin# relief valves, TI, PI, Hents, Drains and other connections on pipin# where possible instead

vessels.

• 3inimum flan#ed connections si:e vent and drain lines shall be >/.

• Generall", the liquid no::les connected to pump suction, re)boiler feed, side draw)off shall be

provided with vorte! brea+ers.

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Rev. No A

Page "# of 34

• $ll tan+s shall have isolatin# valves on process lines.

• hen allowed, in order to minimi:e connection on vessels stand pipes for level instrument

connections can be provided. Isolatin# valves to be installed on sin#le level transmitter or level #au#e.

VIII. 5ATER COOLERS

• Pipin# arran#ement for water lines around coolers is shown in 9i#ure .

• Halves on coolin# water service shall be as per pipin# class. 0ormal practice will be&

O Inlet side valves ;@/& #ate

Q>/ & butterfl"

O 7utlet side valves @/& #lobe Q>/ & butterfl"

• ater pipin# shall be arran#ed, as far as possible, so that the equipment remain full of water in case o

water suppl" failure.

Fi(+e 1. ; 5!te+ Coo-e+ A++!ne)ent

I. PUMPS

• uction and dischar#e valves shall be line)si:e. Jowever, if the suction and dischar#e lines are two

more si:es lar#er than the pump no::les, the valves can be the ne!t si:e smaller *for suction lin process chec+in# is required.

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Rev. No A

Page "" of 34

• If required, rec"cle lines shall be connected bac+ to the suction vessel, preferabl" upstream of

coolin# source.

• hen two or more pumps are manifolded, and onl" if b" pass of chec+ valve is installed, the sucti

valve and an" components between the pump and the valve shall be specified for >;= full shut o

pressure.

• 6low down facilities shall be provided for pumps handlin# C@ and li#hter fluids.

• arm)up;cool)down facilities shall be required when pump is spare or out of service for either of t

followin# conditions&

the pump temperature e!ceeds >=?RC or specific process cases(

the ambient temperature is below the pour or free:in# point of the process fluid(

cr"o#enic pumps.

• Temporar" strainers shall be installed on suction side of all pumps, unless permanent strainer a

specified.

• Permanent strainers installation shall be anal":ed in the followin# cases& pumps in dirt" service(

suction line lar#er than F/ or smaller than >/(

steam traced suction lines.

• In #eneral the strainer selection is&

/5/ t"pe for lines >/ and smaller

MT/ t"pe for lines lar#er than >/.

• The" should not installed if not allowed b" the handled fluid *slurries, etc. or for jac+eted lines.

• trainer bod" material shall be suitable for handled fluid.

• creen shall be made of .. for permanent strainers and carbon steel for temporar" strainers, unle

otherwise required b" the operatin# temperature and fluid• 7n dischar#e side of pump where the pump differential pressure e!ceeds E? bar, double che

valves installation should be anal":ed, unless otherwise specified.

• Pipin# arran#ement for centrifu#al and reciprocatin# pumps are shown in 9i#ure > and 9i#ure

respectivel".

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Rev. No A

Page "2 of 34

Fi(+e 2. ; Cent+i0(!- P()4 A++!ne)ent

NOTES,

. 0ormall" temporar" filter is provided.

>. 6")pass line for warm)up or cool)down *if required b" process( drain valve not required wh

warm)up is provided and b")pass line connected between bloc+ and chec+ valve.

=. Hent and drain requirements, accordin# to Hendor upplier(@. The chec+ valve b")pass can be connected either upstream or downstream the bloc+ valve at pum

dischar#e line.

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Rev. No A

Page "3 of 34

Fi(+e # ; Reci4+oc!tin P()4 A++!ne)ent

NOTES,

. Permanent t"pe strainer.

>. afet" valve piped bac+ to pump suction line or suction drum.

=. Chec+ valve shall be installed.@. Pulsation dampener to be shown, if required, as per pump supplier *optional.

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Rev. No A

Page "4 of 34

. CONTROL VALVES

• Control valves shall be provided with bloc+ and b" pass valves if&

the si:e of the control valve is >/ and smaller( or

the manual control is possible and allowed(

the si:e of the control valve is lar#er than >/ and smaller than F/( and

a. the control valve is in critical service *Process or 8icensor requirement( or

b. cannot be dismounted without shuttin# down the whole unit( or

c. foulant, corrosive, erosive service .

Halves connected to interloc+ s"stem shall be provided with bloc+ valves onl" *no b"pass.

hen the b")pass is not provided, the control valve shall be fitted with hand wheel for manual operatioe!cept if the" are used as shutdown or automatic emer#enc" shutdown valves or for equipment safe

*anti)sur#e valve *neither b"pass or hand wheel.

• $ SA drain shall be provided for the control valve #roups as follows&

a. 97 control valves& one bleed upstream CH( b. 9C control valves& one bleed at each side of the CH.

6leeds shall be installed on the lar#er diameter.

• here pipin# is e!panded after control valve for flashin# condition, the downstream bloc+ valv

shall be equal to or one si:e smaller than the e!panded pipin# *accordin# to process requirements.

• Control valve shall be identified on PID with&

a. ta# number( b. si:e and ratin# if different than pipin# class(

c. fail safe position *97, 9C, 98d. flashin# service *9

• Table shows the recommendations for the si:in# of control valves manifold. It shall be read

conjunction with the followin# remar+s&a. Indicated si:e is main line si:e(

b. i:e for b")pass line shall be as the b")pass valve(

c. 6loc+ valve shall be selected as per pipin# class(d. 6")pass valves shall be #lobe up to K/ and full bore for lar#er diameters(

e. 1eference diameter for bloc+ valves is the si:e of the line on which the valve is located(f. 1eference diameter for b")pass valve is the upstream line.

In case of lar#e difference between si:es of control valve and downstream line *due to flashin# in a ran

out of that #iven in the table, the downstream bloc+ valve shall be equal to or one si:e smaller than t pipe.

The si:e of the b")pass valve has to be selected carefull" if it has an impact on a downstream reli

valve.

T!*-e 1 ; Reco))en"e" Si>in o0 Cont+o- V!-9e M!ni0o-"

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Rev. No A

Page "5 of 34

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Rev. No A

Page "6 of 34

Fi(+e ; Cont+o- V!-9e Asse)*-

NOTES,

. Globe valve t"pe for>. Indicate valve action as follows&

a. 9C closed for air failure(

b. 97 opens for air failure(c. 98 fails loc+ed *no chan#e of position.

=. 6loc+ and b"pass valves, if required, shall be si:ed as per table .

@. 1atin# and flan#e facin# to be shown on PID onl" if different from pipin# class.

I. SAFET' VALVES

• afet" valves shall be located accordin# to process requirements as close to t

equipment as possible, in order to fulfill the $PI ->? part II requirements on pressure drothrou#h upstream pipin#, which shall be less than =U of set pressure of the valve, or on equipmen

and be accessible for chec+ and maintenance purposes. henever the protected equipment provided with a demister pad, the safet" valve shall be installed on the vessel, upstream of t

demister.

Pipin# arran#ements of safet" valves are shown in 9i#ure - below.

9ull)area stop valves car seal open or car seal closed shall be installed upstream and;or downstreaof safet" valves onl" if dictated b" process requirements. The" shall be of such t"pe and si:e that t

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Doc. No

Rev. No A

Page "7 of 34

increase in pressure should not reduce the relievin# capacit" below that required, nor adversel" affe

the proper operation of the pressure relievin# devices.

afet" valves shall be free drainin# towards flare header( when such arran#ement is not possiblfacilities to prevent the sta#nation of liquid shall be provided.

Preferabl" branchin#)off of a dischar#e pipe to blow down header shall alwa"s be at top of pip

and sloped @-R in the direction of flow.

9lare header shall be sloped, >Uo min., towards the +noc+out drum, avoidin# intermedia

poc+ets.

• afet" valves shall be identified on PID with&

a. ta# number(

b. orifice desi#nation(c. inlet % outlet si:e(d. set pressure(

e. ratin# of flan#e if different from pipin# class.

Fi(+e ? ; P+ess(+e S!0et V!-9e Asse)*-

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Doc. No

Rev. No A

Page " of 34

NOTES,

. Connection on top of pipe.

>. 8ocate safet" valve above relief header *e!cept thermal e!pansion=. The flare header shall be sloped, >Uo min, towards +noc+out drum.

@. 9ull)area stop valves *to be provided onl" if dictated b" Process requirements.-. C7 valves installed with stem oriented hori:ontal or downward.

II. VENTS AND DRAINS FOR EQUIPMENT

1. Vesse-s

• 9or maintenance and test purpose, all pressure vessels shall be provided with a vent and dra

dischar#in# to atmosphere. 0ot operatin# vents shall be located on top of vessel with valve blindeDrain shall be preferabl" located on the low point of the bottom outlet pipin#, outside the s+irt.

there is no bottom line or line does not allow complete draina#e of the vessel, the drain shall bconnected to a separate no::le on the bottom head. Hessels with internal bafflin# require speciconsideration *two separate drains or a drip hole on the baffle.

• Pressure vessel handlin# flammable, to!ic and hi#hl" corrosive fluids shall be provided with addition

valve vents and drains enablin# depressuri:ation and disposal of contained fluid as follows&

F-(i" O4e+!tin Vent O4e+!tin D+!in

C@ and li#hter 9lare or suction vessel 9lare or closed drain

7ther h"drocarbons 9lare or $T3 at safe location Closed drain or oil" sewer

To!ic and hi#hl" corrosive dedicated ventin# s"stem Dedicated closed drain or closeddrain

Hacuum service uction vessel

• 3inimum si:e for vent and drain valves for equipment shall be in accordance with the followin

unless otherwise indicated on PID.

Vesse- 9o-()e V 7)#

8 Vent D+!in

.- A A

.- V K A WA

K V E >A >A

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Doc. No

Rev. No A

Page "! of 34

QE >A =A

2. Cent+i0(!- P()4s

• Drain and vent connections on pump casin# shall be plu##ed e!cept for servi

conditions listed below, for which the" shall be valved and piped as follows, unle

otherwise required b" process considerations.

• Hent and drain si:e shall be as per Hendor standards

F-(i" O4e+!tin Vent 718 O4e+!tin D+!in

C@ and li#hter 9lare or closed drain 9lare or closed drain

J"drocarbons *with operatin#

temperature above their flash point

Closed drain or oil"

sewer

Closed drain

J"drocarbons *with operatin#

temperature below their flash point

$T3, Closed drain or

oil" sewer

7il" sewer or closed drain

To!ic and hi#hl" corrosive Dedicated ventin# s"stem

or closed drain

Dedicated closed drain

Hacuum service uction vessel

Notes,. Halved vent connection is not applicable to self)ventin# pumps. elf)ventin# pumps are identified b

the machiner" specialist after pump selection.

III. STRAINER

• trainers shall be provided for the protection of the followin# equipment&

a. all pumps at suction and flushin# line( b. turbines.(

c. ejectors.

d. steam traps(e. pilot #as line(f. showers % e"ebaths(

#. all compressors at suction line *screened inta+es shall be provided for air compressor and

blower.

• The bod" material shall conform to the requirements of the pipin# class. The material of the scree

shall be specified as section .

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Doc. No

Rev. No A

Page 2# of 34

IV. STEAM TRAPS

• team traps are utili:ed to eliminate condensate accumulation at low points of equipment and stea

lines.

• $ll steam traps shall be protected b" a /5/ t"pe strainer unless traps are supplied with an intern

strainer *small diameters.

• 0ormall", float t"pe steam traps shall be used for process service.

• The arran#ement for traps is shown in 9i#ure K below.

• 7n steam headers, at the lowest points and on the header ends, pot with steam trap will be provid

normall" not shown on PID. Pot assembl" and dimensions are indicated in 9i#ure E as standard case the" have to be shown on PID because of Client's requirement.

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Doc. No

Rev. No A

Page 2" of 34

Fi(+e @ ; P+ocess Ste!) T+!4 Asse)*-

Notes

". trainer to be required if not included in trap suppl".2. Chec+ valve to be located at hi#hest point as close as possible to condensate return header *for an

free:in# purposes.

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Rev. No A

Page 22 of 34

Fi(+e ; Con"ens!te Pot Asse)*-

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Rev. No A

Page 23 of 34

V. SAMPLIN$

• amplin# connection on pipin# shall be not less than =;@/. $ first bloc+ valve shall be provided as clo

to the header as possible. It shall be followed b" a #lobe or needle valve *X WA. The distan

between these valves shall be as short as possible.

• 9or liquefied #as, the distance between the two valves shall be K?? mm min

• amplin# arran#ements are shown in 9i#ures F, , ?, , >, =, @, -, K and E.

• The samplin# shall not be located at dead points of the process line.

• ample outlet shall be located at #rade or accessible from platform.

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Doc. No

Rev. No A

Page 24 of 34

Fi(+e ; S!)4-e connection Asse)*- 70o+ not "!ne+o(s -i(i" o+ !s se+9ice8

Notes

". 8ocate sample outlet accessible from #rade or service platform.

2. To be used onl" for sample that is ver" rarel" used when connection to the fare is difficult to be done.

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Doc. No

Rev. No A

Page 25 of 34

Fi(+e ; O4en s!)4-e connection Asse)*- 70o+ "i+t 0-(i"s8

Notes


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Doc. No

Rev. No A

Page 26 of 34

Fi(+e ;C-ose" s!)4-e connection Asse)*- 70o+ !s se+9ice8

Notes


2. $n" convenientl" located source of differential pressure, control valve, heat e!chan#ers, ect.3. Threaded female connection for sample c"linder.

4. 3anometer shall be located for readin# b" person operatin# needle valve *on c"linder.5. 3a+e connection on top of pipes as shown in fi#ure F.

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Doc. No

Rev. No A

Page 27 of 34

Fi(+e ;C-ose" s!)4-e connection Asse)*- 70o+ -i(i" se+9ice8

Notes". 8ocate sample outlet accessible from #rade or service platform.2. Halve accordin# to process line pipin# class.

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Doc. No

Rev. No A

Page 2 of 34

Fi(+e 1< ;S!)4-e coo-e+ Asse)*-

Notes

". 8ocate sample outlet accessible from #rade or service platform.2. 8ocate valve in an accessible position.

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Doc. No

Rev. No A

Page 2! of 34

3. To be specified for process temperature over the defined service temperature .

Fi(+e 11 ;S4eci!- connection Asse)*- 70o+ !s se+9ice8

Notes

". 3anometer shall be readable from needle valve *on c"linder operator.2. Halve accordin# to process line pipin# class.3. Provide adequate space for removable sample c"linder.4. Threaded female connection for sample c"linder.5. PI is provided for pressure monitorin#.

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Doc. No

Rev. No A

Page 3# of 34

VI. VALVES AT BATTER' LIMITS

• $ll lines leavin# or enterin# the plant batter" limits shall be valved.

• The valves shall be #rouped at plant batter" limits into one or more manifolds.

• $ll bloc+ valves at batter" limits shall be equipped with spectacle blinds toward plant side.

• $ drain valve shall be installed between 6.8. bloc+ valves and the unit.

• 9or t"pical arran#ement of valves at 6.8. refer to 9i#ure .

• $ll process lines leavin# from units or bloc+ batter" limit shell be valved.

• Generall", all utilit" lines leavin# or enterin# the units or bloc+ batter" limit shall be valved, unle

otherwise shown on PID.

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Doc. No

Rev. No A

Page 3" of 34

Fi(+e 11 ;S4eci!- connection Asse)*- 70o+ !s se+9ice8

VII. VALVIN$ C6EC: LIST

• 6loc+ valves shall be provided&

a. for all lines crossin# plant batter" limits *the valve on flare header shall be C7(

b. at spared equipment(c. at vessel with the followin# e!ceptions&

connections for overhead vapor lines, transfer lines, reboiler lines % side stream

draw)off(

pump suction % reflu! lines(

vents open to atmosphere(

lines from;to safet" valves.

d. at pump and compressor suction and dischar#e lines(

e. at steam turbine feed and e!haust lines(

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Doc. No

Rev. No A

Page 32 of 34

f. at utilit" lines connected to lines or process equipment(

#. for isolation purpose of instruments *e.#. control valves or equipment to be inspectdurin# the normal operation of the plant(

h. at utilities hose stations(i. at stora#e close to tan+ no::les and outside the di+es(

j. at heat e!chan#ers process side, onl" if the" can be maintained durin# the normal operatioof the plant(

+. at steam traps assembl"(

l. at samplin# devices(m. for preventin# flow *e.#. at drains, vents, steam out points or divertin# flow throu#h

alternative route *e.#. b")passes(

n. at suitable points in fire water rin# to allow isolation.

• 6loc+ valve t"pe shall be accordin# to pipin# class.

• Double bloc+ valves shall be provided for&

a. operatin# vents;drains, PH b")passes and instrument connections for flammable a

to!ic services with ratin# K?? and hi#her(

b. utilit" lines permanentl" connected to process lines or equipment in all cases(

c. preventin# product contamination where the use of spectacle blinds is not suitable(d. dirt" or coc+in# services(

e. sample connections(

f. operatin# vents and drains on h"dro#en service or 8PG service where flashin# aconsequent free:in# can occur.

• Chec+ valves shall be provided where necessar" to prevent bac+ flow&

a. on the dischar#e of centrifu#al and rotar" pumps and compressors( b. on the dischar#e of dosin# and volumetric pumps(

c. on utilities and service lines permanentl" connected to process lines or equipment(

VIII. SPECTACLE BLINDS C6EC: LIST

pectacle blinds shall be provided&

a. at batter" limits, for all the lines enterin# or leavin# #eo#raphical unit *refer to fi#ure pectable blinds shall be installed towards plant side(

b. for isolatin# purpose at vessels to be inspected durin# normal operation of the plant(

c. to prevent contamination of process or utilit" lines, durin# normal or special *i.e. re#eneratioetc. operation.

I. STEAMIN$ OUTPUR$IN$

• The plant shall be desi#ned with steam out ; pur#in# connections adequate in numb

and si:e, to enable inert flushin# durin# startup, shutdown and maintenance operation.

Pur#e connection shall be preferabl" located on pipin# instead of equipment.

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henever provided on vessels, pur#e connections shall be at min. distance from tan#ent line.

Hessel capacit" *m= Connection *inches team out connection

H E- >/

>/

E- H >>? =/ >/

>>? H @>? @/

=A

H Q @>? K/

@/

• team out connection =/ and lar#er shall be permanentl" connected to steam header.

• 4quipment and associated lines which will be steamed durin# start)up or shut down operations, shall b

desi#ned for thermal e!pansion for the hi#her of&

a. steam)out temperature ?RC(

b. desi#n temperature of the line or equipment.

• The e!tension of steam out in the plant will be #eneral with the followin# e!ceptions&

a. $ir ervice

b. 0itro#en

c. ater

. DRAINA$E S'STEM

• $ll the drains from equipment, lines or instruments, which for process reasons must be piped into

open sewer or a closed s"stem, shall be shown on PID with the indication of the destination *oisewer, chemical sewer, recover" s"stem, etc...

• T"pe of ewers&

a. oil" water sewer(

b. chemical sewer(

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c. amine closed drain(

d. caustic closed drain(e. sanitar" sewer(

f. sour water sewer(#. waste water sewer

h. storm water draina#e s"stem.

• Process Closed Drains&

a. 8PG closed drain(

b. h"drocarbon closed drain(

c. aromatic closed drain(d. other closed drain.

I. INSTRUMENTATION

Documents

Manual for PID Preparation