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2 Computerized issue STIE STIE STIN SEP. 971 General Revision STIE STIE STIN DIC. 90

REV. DESCRIPTION PREP.D CHK.D APPR.D DATE

Il presente documento RISERVATO ed di propriet dell'AGIP. Esso non sar mostrato a Terzi n sar utilizzato per scopi diversi da quelli per i quali stato inviato.

DESIGN PRACTICE

OLDONE LINE DIAGRAM

Document type ED

06221.DOC.ELE.PRG

Rev. 2

September 1997

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06221.DOC.ELE.PRGRev. 2 September 1997Sheet 2


FORWARD

Rev. 1 Sheet 36December 1990

Rev. 2 Sheet 28September 1997Computerized issue

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INDEX

1. DOCUMENT SCOPE

2. APPLICABILITY

3. REGULATIONS AND REFERENCE DOCUMENTS

4. RESPONSIBILITY

5. ISSUE SCOPES, PROJECT PHASES AND REVISIONS5.1. Issue scope5.2. Project phases

5.3. Revisions

6. CONTENTS

6.1. Applications6.2. Content description6.2.1. Operative State6.2.2. Diagrams6.2.3. Equipments connections6.2.4. Equipments tables6.2.5. Tables of items inside equipments6.2.6. Uses tables6.3. Issue contents in the different project phases

7. GRAPHICS7.1. General description7.2. Formats7.3. Symbols7.4. Lines

8. EXTRACTIONS

9. EXAMPLE

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1. DOCUMENT SCOPE

This document aims at defining the contents, the preparation methods and the issueresponsibility of the document called One Line Diagram "OLD".

The procedure consists of a description of the drawing content and of a description of thereproducing method . The item classification definition (of goods type), created by thementioned document, can be found on the related standard document, reported inchapter 3, Ref. 2.

2. APPLICABILITY

This Standard can be applied to the electrical equipments related to the industrial

processes used by AGIP for both gas and liquid hydrocarbons treatment plants design.It is also applied to the electrical plants auxiliary systems of the mentioned process,including the power production plants, the ventilation systems (HVAC), the safetysystems, etc.The One Line Diagram (OLD) will be the starting document for all the remaining electricalplan drawings of a plant.

3. REGULATIONS AND REFERENCE DOCUMENTS

REGULATIONS: CEI Brochures 3-14 and 3-32IE Series 617, parts from 1 to 13

Ref. I05496.DOC.GEN.SPC INDICE CODICI - NUMERAZIONE DOCUMENTI DI

COMMESSA

Ref. 204120.DOC.GEN.PRG ITEM NUMBERING AND CODINO SYSTEM

Ref. 320319.DOC.ELE.SDS GRAPHIC SYMBOLS, DEVICE NUMBERS AND LETTERS

FOR ELECTRICAL INSTALLATIONS

Ref. 405428.DOC.GEN.PRG FORMATS, DRAWINGS, SPECIFICATION EXECUTION

CODES

Ref. 506241.CAE.ELE.LIB CAD/CV SYSTEMS: EXECUTION SYMBOLS FOR OLD

ONE LINE DIAGRAMS (in progress)

Ref. 606215.DOC.GEN.PRG PLANT UNITS: FUNCTIONS, MAIN COMPONENTS,

PHISICAL INTERFACES BETWEEN UNITS

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4. RESPONSIBILITY

The Engineering unit in charge of preparation, control and issue of the OLD is the"PLANT LAYOUT" one. The first preparation is useful for the Unit in charge, which isgoing to circulate the document among the company disciplines, for the suitable interfaceactivities; both in the case of this document being produced by AGIP, or its beingproduced through external Contractors..

The Unit in charge of the control and updating of this Standard is STIN.

5. ISSUE SCOPES, PROJECT PHASES AND REVISIONS

This standard, presenting the OLDs description, beats in depth the breakdown into

project phases and, therefore, the logic and the scope for the drawings issue andrevision. The project phases normally applied for the plant design are:

Feasibility study

Basic design

Detail design.

The sequence of project phases and issue scopes presented in the following paragraphscan be applied to a complex plant, requiring a complete designing. For smaller projects,the issue scopes can be reduced.

5.1. Issue scope

Within the issue of the different project phases several scopes for the document issuecan normally be identified:

as Draft "B"(not to be filed)

for Comments "C"

for Approval "A" for Tender Request "R"

for Order "O"

for Construction and Erection "M" Final "F"(as built)

Notice that, when the customer's approval is needed, it is asked with an OLD issued forComments "C"; all eventual client's remarks are then inserted in the document with theissue scope: Approval "A" which then, after absorbing all client's remarks, becomes theapproved document.

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5.2. PROJECT PHASES

The document object of this standard is produced with different contents of the issuesassociated to the different project phases, valid for the plants mentioned in theapplicability chapter.For each project phase, in the following chapters, the minimum content required for everyissue of the document will be clearly stated.

The descriptions of the project phases are the following ones:

a) Feasibility "F"First issue, internal to AGIP, of the document aiming at the plant feasibility study. Itcan be in the draft form, for comments, or already approved (FB, FC, or FA).

b) Basic project "B"Issue of the document aiming at the Basic design. It is used for the preparation ofthe tender. It is possible to extract the first lists, for internal use only, from this issue.It can be published for comments, for Tender Requests, for orders or as approved(BC, BR, BA o BO).

c) Detail design "D"Issue of the document aiming at the plant Detail design. It permits the completing ofthe design by al] the document users. It is used both inside AGIP and outside it. Itcan be published for comments, as approved, for construction and erection and asbuilt (DC, DA, DM or DF). In its DF version it is, therefore, an useful document forthe plant operation and is enclosed to the Project Databook.

Summing up, on the OLD there will tee, on the suitable label position, the issue scopeexpressed in the following way:

PROJECT PHASE ISSUE SCOPE CODE

F(feasibility ) Comments PR

B (basic) CommentsBid RequestApproval

PRROAP

D (detail) CommentsApprovalOrderConstruction/Erection

PRAPRACO

C (construction) CommentsApprovalAs Built

PRAPAB

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5.3. Revisions

The revisions of the OLD document are reported on the drawing label, in agreement withthe Ref. 4 standard.

The revision number is progressive for the different issues. The revision number shouldbe incremented with the changing of the project phases or issue scopes. For a pair"project phase - issue scope" there can be several revisions.

For every revision, every change in comparison with the previous one should be pointedout on the drawing, and it should be done in agreement with the methods expressed inthe drawing contents chapter, all this should appear on the label. Every indication ofchanges related to more distant revisions should be eliminated.

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6. CONTENT

This chapter describes the content, the reference symbols and the different compilationlevels related to the issue stage of the document object of this standard.

6.1. Application

The One Line Diagram will present detail information on the Electrical Units (from 900 to945), as well as on other units having dedicated electrical equipments (i. e. 470 and 480)in order to allow:

development and finalization of the detail design and of information transfer from theelectrical units to all the disciplines

the completion of the equipment lists, a preparation of the electrical equipment data sheets, a completion and modification of the electrical users list, a draft of the general layout drawings and plans (plot plan and cable routes), a preparation of the erection procedures, of pre-operational tests, of the start up and

operational procedures, the operators training, a preparation of the electrical equipments maintenance procedures , a Basic for the calculation of short-circuits protections, charges flow, steadiness and

transient.

6.2. Content description

The One Line Diagrams (OLD) are drawings usually reproducing the main equipments ofthe plant electrical unite, and the control boards, both centralized and local, related to theindividual process unite, defined in agreement with the Ref. 2 standard and endowed of aseries of electrical descriptive data about their functioning. The main electrical powerconnections are introduced as well, and they are finally completed with all the instrumentsand protections for a good plant operation.

The equipments, if possible, will be reproduced in downwards logical sequence.

Besides the OLD report all the real or reserve electrical users, which are fed by theelectrical one fine and the related power expressed in kW.

Notice that in this chapter the MAXIMUM CONTENT OF THE MOST COMPLETE ISSUEis being described.

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6.2.1 Operative state

All apparatus mentioned in the following chapter should be reproduced in the UN-fedstate or in the position they have in absence of any operation.

For example, the connections of a relays should be reproduced as UN-fed relays; theapparatus for emergency circuits, alarm, safety, etc., should be reproduced in the state ofa normal functioning of the system.

Trial apparatus and such should be reproduced in normal position and not in trial position.

6.2.2 Diagrams

Every OLD should be completed with the following items:

a) an indication of all the feeding apparatus available (generators, alternators,accumulators, etc.) including the feeding from external power lines. They shouldpresent all the technical data presented in the next chapters.

b) all fine transformers, all the rectifiers, inverters and converters with the relatedtechnical data.

c) every electrical board belonging to either the electrical and instrumentation units(series 900 to 990) or belonging to other series of units (i. e. units 470, 480, 700,etc.).

Identification of the boards and indication of the bars and the objects contained inthe board, by inserting a hatched rectangle including all the branch, the instrumentsand internal protections.

Indication of the main technical data related to the bar, as repeated in the nextchapters; such indications should be reproduced above the bar fine, and as near aspossible; we can suggest dividing them into three groups and placing them at thebar ends.

A schematic representation of the bar branches:

voltage and current transformers (unidentified) converters (rectifiers, ondographs etc.) switches, contactors, sectioners and the related execution types fuses measure relays and releases abbreviation of the bar branch "type" (i.e.: TR20) as reported in the Ref. 7

document.

Notice that the branches to electric users, whose one fine diagram is notrepresented, should appear just once on the board if they use the same "type". Seethe table on the side of the One Line Drawing for a definition of the kind and numberof users making use of the same king of branch.At the ends of the outlet branch from the boards, from which you can extractthreephase current with or without neuter, the wires number should always appear.

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d) Every main connection (cable or bus bar) connecting the different equipments, is

drawn with a hatched fine and with an indication of the wires number.Other information about the connections are reported in a special chapter dedicatedto them.

e) The main motors fed by medium voltage (power > 150 kW)

f) The equivalent fictious motors" corresponding, for the absorbed power, to the actualwhole of the already defined motors (described in detail in the users table) or beingdefined (foreseen), depending on the branch type linked to the interested motor.

g) The users fed by low voltage, in the form of a table

h) The schematic indication of the mechanic al and/or electrical inter-blocks among themain internal components, by drawing a thin hatched fine and a suitable symbol.

i) The instruments and protections interlinked with the One Line Diagram. Both theinstrument and the function symbolic conventions are comprised, sometimes eventhe symbol of the different connections (either cables or signals.

In particular the instruments are organized as follows:

Sensor or primary elements (TA, TV, etc.) Thermic equipments Protection relays Local or on local panel indicators Eventual local signals or selectors

Information and equipment state on screen (when active mimics are foreseen)

The indication, where possible, of the protected object, by a hatched fine connectingthe protection with the object .A distinction, with a suitable remand writing, of the board where the protection havebeen placed on (if different from the protected board): converters board protectionsboard control board

j) all the parallel equipments.

k) Besides what is written over the diagrams, there should a]so be the followinggeneral information:

Equipment identification, in agreement with the Ref. 2 document, inserted alltogheter without dividing hyphens and/or blanks

The indication of the current, of the conductors number and the connectionmethod

The coded abbreviation of all the represented equipments, boards included,without the internal branches of the single board

The indication of all interlinkings with eventual other sheets of the One LineDiagram belonging to the same plant

All technical information about the main equipments (written next to them) andabout the feeding from external lines, as described in detail in the chapterdedicated to them.

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Identification and indication of the electrical equipments packages; the

identification should be written below, on the right of the parallelogram definingthe package. Notice that such package defining fine cannot separate the internalcomponents of a board.

The equipments inside a package do not require any identification only whenthere is a drawing by the package designer identifying them; otherwise it is AGIPresponsibility, or the charged Contractor's, to supply such information.

A marking of all the OLD parts which have been changed since the previousrevision. The revision number bringing the changes about should be written,inside a suitable small triangle.

A marking, with a small cloud or hatched area, of the portions of electrical plant tobe developed in the FUTURE, or as an alternative to the implemented parts ofthe plant.

A synthetic description of the bar function, for the lower level bars without

outgoing branches. Notes.

6.2.3 Connections among equipments

From the OLD reading it is possible to derive the main properties of the connections:

connection composition current intensity connection length

The writing should be parallel to the connection, taking care, when possible, to place the

identification on one side of the fine and all other information on the other side,independently from the fine being orizontal or vertical. Such information, therefore, willlook like this:

Connection Identification

A700001PVA

Connection

3(2x50) 120A 1.5KM

Connection length

Current Flow

Connection composition

The identification of the connection, when written, should be reported complete with all itsparts and in agreement with the attribution criteria expressed by the Ref. 2 document.

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Help in defining aconnectionbelonging unit can be found in the Ref.6 document.

Notice that connections and cables, in the case of power cables, have the sameidentification method since there is always a correspondence between them. Even whenthe connection is made up of several parallel cables, these have all the sameidentification.

The connection composition supplies the characteristics of the cables making it upand it should be identified with two or more digits, separated by brackets and by "x", andwhich in turn separate the cables number, according to a given order, the conductorsnumber and the section of each conductor, expressed in sqmm. Of course, if theconnection is made up of a single cable, the first digit and the brackets should be left out.

The current intensity (flow), according to which the connection has been made,relates to a single one of the cables making up the connection.

It is expressed in Amperes and the amount should be written, followed by an A.

The connection length, expressed in meters, represents the physical distance amongthe connected objects and, therefore, relates only to a single one of the cables making upthe connection. The Cable length to buy, so, doesnt correspond to such a value, but toone of its non-decimal multiple (number of cables in the connection) added to theendings.

Compilation examples of the descriptive part:

3(2x50) 120A 1.5KM connection of three cables, each one 1500 m long, with 120Ampere flow and each one made of 2 wires of 2 wires of 50mm

2

2x2.5 8.5A 700M single cable 700 m long, with a 8.5 Ampere flow and 2 2,5 mm2

wires

In function of the OLD issue phase, the identification can, or noted, be left out as well asthe use of a reduced characteristics definition placed on the side of the connection.

All interlinkings among connections placed on different sheets of the same On LineDiagram drawing, are represented by an arrow shaped symbol having inside:

Interfaced equipments Number of the interface drawing sheet

6.2.4 Equipments tables

Next to the main equipment belonging to the One Line Diagram there should be the mostsignificant characteristics.We summarize here all equipment requiring this as well as the data to be pointed out;notice that such information availability changes along with the document issue scope.

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They normally should be placed on the right of the symbol and written on several lines.

The external network mentioned here even not representing an equipment, requires itsown reproduction on the One Line Diagram and a combination of technical data listedbelow.

EXTERNAL NETWORK

Description Tension (KV) Available power (MVA) Short circuit current (MVA) Break down current (A) Intervention time System of grounding connection

CONTINUOUS CURRENT GENERATOR(Goods Class=EG) (*) Abbreviation Identification Nominal power (Kwe) at generator terminals for installation normal conditions Nominal power (in kw) Nominal tension (in kV)

ALTERNATE CURRENT THREE-PHASE GENERATOR(G.C.=EG) (*)

Abbreviation Identification Nominal power (Kwe) at generator terminals for installation normal conditions Nominal power (in MVA)

Nominal tension (in kV) Nominal frequency (Hz) Power Factor (cos fi) Sub transitory reactance

SYNCHRONOUS GENERATOR (ALTERNATOR)(*) (G.C.=EG)

Abbreviation Identification Nominal power (Kwe) at generator terminals for installation normal conditions Nominal power (in MVA) Nominal tension (in kV) Nominal frequency (Hz)

Power Factor (cos fi)

ACCUMULATORS(G.C.=EB)

Abbreviation Identification Elements number Nominal tension (V) Accumulator capacity (Ah)

CONVERTER (RECTIFIER)(G.C.=ED) Abbreviation Identification Nominal tension (V) Nominal current (A) Nominal power (Kw)

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CONVERTER (INVERTER) (G.C.=EF)

Abbreviation Identification Nominal tension (V) Nominal current (A) Nominal power (Kw)

SINGLE-PHASE AUTO-TRANSFORMER(G.C.=ET)THREE-PHASE TRANSFORMERTHREE-PHASE AUTO-TRANSFORMER(Star connection) Abbreviation Identificativo Nominal power (in MVA) Nominal relation Short circuit tension (%) Vectorial Cooling type

SINGLE-PHASE AUTO-TRANSFORMER WITH TENSION REGULATION andTHREE-PHASE TRANSFORMER WITH TENSION REGULATION(G.C.=ET)

Abbreviation Identification Nominal power (in MVA) Nominal ratio Tension variator Short circuit tension (%) Vectorial group Cooling type

THREE-PHASE TRANSFORMER WITH 3 WINDINGS(G.C.=ET) () (connection star star triangle) Abbreviation Identification Primary nominal power Secondary nominal power Nominal power Primary/secondary transformation ratio Primary/tertiary transformation ratio

Primary/secondary short circuit tension (%) Primary/tertiary short circuit tension (%) Secondary/tertiary short circuit tension ( %) Vectorial group Cooling type

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THREE-PHASE TRANSFORMER WITH 3 WINDINGS(G.C.=ET) ()

(different connections) Abbreviation Identification Primary nominal power Secondary nominal power Tertiary nominal power Primary/secondary transformation ratio Primary/tertiary transformation ratio Primary/secondary short circuit tension (%) Primary/tertiary short circuit tension (%) Secondary/tertiary short circuit tension (%) Vectorial group

Cooling type

CENTRAL STARTING TRANSFORMER(G.C.=ET) () Abbreviation Identification Primary nominal power Secondary nominal power Tertiary nominal power Compensation nominal power Primary/secondary transformation ratio Primary/tertiary transformation ratio Secondary/tertiary transformation ratio Tension variator Primary/secondary short circuit tension (%) Primary/tertiary short circuit tension (%) Secondary/tertiary short circuit tension (%) Vectorial group Cooling type

RESISTANCE(G.C.=EY)

Identification Nominal resistance (ohm) Break down current to "round (A) Staying time (s)

INDUCTANCE(G.C.=EY) Identification Nominal resistance (ohm) (+)

MOTORS(represented on the One Line Diagram) ($)

(either real or "equivalent") Identification (real ones only) Nominal power (Kw)

SUB-STATION SWITCHES(G.C.=ES)

Identification Flow (A)

Breaking-off power (KA)

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SUB-STATION SECTIONERS(G. C .=ES )

Identification Nominal tension (KV) Nominal current (A)

SUB-STATION METER(G.C.=ES)

Identification Nominal tension (KV) Nominal flow(A)

NOTES:(*) The generators should never be identified alone, but always with the commanding

operator, reproduced on the left of the generator symbol, with the letter "D" if diesel

or "T" if steam turbine or "G" if gas turbine. The following data should also bewritten: Abbreviation Identification Power BHP (Kw) Rotation (Rpm)

() The nominal powers of the transformers with three or more windings should bewritten on the same fine, separated among them by a bar "/" and the fast valueshould be followed by the unit of measure.The same thing should also be done for the transformation ratios and the shortcircuit tensions respectively.

($) The goods class of the related motors can be either EX, if the motor is separatelyidentified, or the same of the driven equipment.

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6.2.5. Tables of the equipments internal items

Inside the main equipments belonging to the One Line Diagram some relevant items,whose main characteristics should be reported, are identified. Of course the availability ofsuch information changes with the document issue scope.They should normally be placed on the right of the symbol and written on several lines.

Differently from the equipments requirements, such internal items do not ask for thewriting of the complete identification, but they just require the writing of somecharacteristics defined as "Items abbreviations in the Basic list", in agreement with theRef. 3 document (see Section 5, Block 3A of the marking methods), indicated by theminus "-" sign, by one or more letters and by one or more digits.

It is important to give the internal items some digits which can distinguish one from theother; a good method is to give to any main item of the same branch, as first digit, thesame progressive number, taking care to avoid such a progressive to be found in anyother branch of the same board.

For example, if a branch helds a sectioner (main item), a meter, two current transformersand one toroidal current transformer, and they belong to the branch with the progressive3, such items have, in the drawing, the following "Items abbreviations in the Basic list":

-Q3 -K3 -CT1 -CT2 -CTR

If the complete identification of every one of the mentioned items were required, theseshould be identified as follows:

0920EL001-Q3 0920EL001-K3 0920EL001-Q3CT1 0920EL001-Q3CT2 0920EL001-Q3CTR

In such a way they can be distinguished from every other similar items belonging to thesame board 0920EL001.The items requiring this and the data to be pointed out are summarized here:

BAR

Current nature and phase number

Tension (KV) Frequency (Hz) Nominal flow (A) DSC (Design Short Circuit Current) (KArms o KAp) Bar (A) and time (s) thermic current Calculated short circuit current (KA)

CURRENT TRANSFORMERS(-CT) Item abbreviation in the Basic list Transformation ratio Quantity (in brackets)

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TOROIDAL CURRENT TRANSFORMERS (-CTR)

Item abbreviation in the Basic list Transformation ratio Quantity (in brackets)

TENSION TRANSFORMERS(-VT)

Item abbreviation in the Basic list Transformation ratio Quantity (in brackets)

SWITCHES(-Q)

Item abbreviation in the Basic list (with progressive on the board) Nominal flow (A) Break-off power (KA)

SECTIONERS(-Q)

Item abbreviation in the Basic list (with progressive on the board) Nominal tension (V) Nominal current (A)

GROUNDING SECTIONERS(-QE)

Item abbreviation in the Basic list (with progressive on the board) Nominal tension (V) Nominal current (A)

METER(-K)

Item abbreviation in the Basic list (with progressive on the board) Nominal tension (V) Nominal flow

REMOTE CONTROL SWITCH(-K)

Item identification in the Basic list

FUSE(-F)

Item identification in the Basic list Nominal current (A) Break-off power (KA)

RECTIFIER(-V)

Item identification in the Basic list

CONVERTERS, RECTIFIERS, ONDULATORS(-U) Item identification in the Basic list

While all the writings of the internal equipments are placed next to the symbol, for thebars the positioning is the one given by the following example:

Short circuit data Normal Operation data

DSC 70KAp 30KA 1 3N 0.38KV 50EZ 400A

Icc 50KA

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6.2.6. Users tables

On one side of the OLD drawing, over the label, there should be a suitable table todescribe the main characteristics of the users fed by the bars reproduced on every singlesheet.

The same electrical user, therefore, cannot appear on more sheets belonging to thesame One Line Diagram.Each table should absolutely present:

the board identification, always written in the complete form, the branch type, marked in the same way it has been identified on the side of the

rectangle next to the board,

the progressive that, according to the IEC (Publication 750) identification should beassociated to the literal part of the 3A block (see Ref. 3), in order to allow the markingof the relevant objects composing the branches (i.e. -K3 = relais n 3)

the Nominal power, in Kw, required by the users the full identification of the power users a short description of the users the column and the cell lodging the branch related to the users a place to show the users undergoing a revision

The users are ordered according to the feeding boards and branch types, taking care tomention the higher tension boards first (following the same criteria of their layout in thedrawing).

The progressive associated to each branch should be different, inside the same board;there is no need for them to be in a growing order in the table. Some numbers can beskipped.

If the space planned in the drawing to held the table were not big enough to describe allthe users required by the One Line Diagram, it is possible to continue the same table onthe first available space above, on the right, next to the already written table portion.

At the end of the table there should be a Note referring to the project documentpresenting all the branch types to be applied for the mentioned project.Notice that the table should not be filled in for the power users inside a Package, unlessthis is made up by a single equipment. Often we show, as a Package user, the localdistribution small panel belonging to the Package itself.

In figure I of this document there is an example, not complete, of such power users tablecompilation; the rim of the table is not taken into account, since it must be adapted to theavailable space and to the instrument it is produced by.

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6.3. Issues content during the different project phases

The contents the OLD document should have in the different issues corresponding to theproject phases mentioned in chapter 5, are described here:

a) The OLD issue aiming at the "Feasibility Study", usually made at the end of the firstpreparation, reports only:

the main boards and equipments, the boards and equipments identifications, the main connections, the abbreviations, the current type and the tension, the most relevant electric charges,

the esteemed data of the not yet available charges (equivalent motors).

Being this an issue valid for the plant feasibility study, it doesn't require any otheridentification nor any table of the fed users.

b) The following issue, called "Basic design", compared to the Feasibility study shouldpresent the following additional data::

the total power boards, the complete properties of the bars, all the connections among the boards, the connections identifications and the related properties the power users data, even if not completely identified, required by the tables. an indication of the bars branch types and the related codes, an indication of the protections , an indication of the required instruments and control systems, an indication of all the available feedings, all the available properties of the main equipments.

c) The final issue, called "Detail design", which is usually introduced in the UsersHandbook, if compared to the Basic design should present the following additionaldata:

all existing equipments, all the power users data with the related identifications, when required,

the final attribution of a column and a cell to every fed user, reserves included, all the comments, notes, information needed by the electrical system

management.

Of course the intermediate issue scopes, within a project phase, present more and morecomplete contents as we get nearer the final scope of the mentioned stage.In the OLD drawing label there should always be the issue code, identified in agreementwith the coding presented in Ref. 5:

FB, FC, FA, BC, BR, BA, BO, DC, DA, DM, DF,

indicating, in such a way, the project phase and the scope which brought to the issue ofthe drawing.

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7. GRAPHICS

7.1 General description

In general the OLD should present, in a schematic way, the plant feeding sequencereproducing, as much as possible, the logical order according to which every bar andevery user is fed and keeping, where possible, the subdivision deriving from the plantlayout.

The best possible clearness of interpretation should be guaranteed, therefore theequipments should not be too concentrated and the connections crossings should beminimized.It is a good idea, whenever possible, to group the items located in the same plant area.

If, sometimes, it would appear as suitable to give some kind of border to the objectsbelonging to the same area, we suggest marking it with the codes and definitionsidentified for every single project, in agreement with Ref. 2Identical or parallel items or plant portions will always be drawn with the same detail.

The board identifications and the related abbreviations are always written inside a smallrectangle, placed across the upper dine of the top left corner of the rectangle enclosingthe board components, using bold not underlined letters 4 mm high , while the eventualidentification of a package should be written in the bottom right corner of the relatedborder.

Example:

A920EM001

MCC

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7.2 Formats

The drawings are generally made in Al format and, if necessary, on several sheets.Before making the OLD on different sheets it is useful to consider whether the A0 formatcould contain the entire One Line Diagram; this solution could be the best.

In the case the chosen format could not contain the entire One Line Diagram, it isnecessary to divide its content in such a way to have the higher tension bars on the firstsheet and in the second one (and in the following ones) the lower tension bars and thecontinuity.

Of course all information reported on the A1 and A0 formats should respect the spaceoccupation criteria imposed by the Ref. 4 document, besides the drawing should benumbered in agreement with the rules expressed by the Ref. 1 document.

In the case the One Line Diagram is made on several sheets, the graphiccorrespondence among the references to the different sheets should be respected, inorder to make the drawings sequential reading easier. We also suggest to keep theincoming above and the outgoing below, as long as this rule is not in contrast with a goodreading of the drawing.

7.3 Symbols

The graphic symbols to adopt for the compilation of the One Line Diagram are presentedin the Ref. 3 standard document.The Ref. 5 document is the standard symbols library for OLD, CAD produced.

All the equipment and connection symbols introduced into the One Line Diagram can bedrawn with different thickness, according to their being subject to high, medium or lowtensions the texts, protections, and all instruments in general, as well as the discharges,the grounding connection, with all its objects, and the graphic representations in general(the star, the cable endings, etc.) are excluded from this rule. The transformers shouldkeep the thickness required by the primary tension value.

In the case the graphic instrument doesn't make it easy to use different thickness, thewhole drawing made in a single thickness is accepted, with the only exception of thebars, which should be no less than 0.5 mm thick.

Thickness are going to be defined in the following chapter.

Also the symbols sizes vary according to the related tension level.Made I the size of the symbols for the lowest level tension, the increasing ratios are thefollowing ones:

Medium/High tension 1.1

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7.4. Lines

The lines making up the bars, equipments, branches and power connections symbols canbe made in the following thickness:

barboardborder

equipmentconnections &

branch

High/Medium tension 0.8 0.2 0.2

Low tension 0.5 0.2 0.2

Where the available graphic instrument doesn't permit an easy subdivision of the

thickness, at least the graphic representation required for low tension should be used.

The bars and the branches lines sould be continuous while the bordering lines of thesame should be hatch and point, with 10 mm long hatches.

The connections are represented with a 5 mm thick hatched fine.

The instrumentation and protections borders, with an indication of the enclosing board,should be hatched (3 mm) and 0.2 mm thick.

The bus bars should be represented by three parallel lines, with the central one havingthe thickness required by the equal tension connections, while the two external ones willbe 0.5 mm thick, and be 0.8 mm far from the central one.

All the instruments should be represented with 0.2 mm thick lines.

The lines representing the connections on the One Line Diagram should always be drawnhorizontally or vertically. When there are crossings among lines, the vertical one shouldbe interrupted, not the orizontal one.

In any case, the instrument lines will always be interrupted when crossing other lines.

The Package borders are made with 5 mm hatches followed by two dots placed in a 5mm space. Such borders and the small clouds, or the rectangles of the future parts,should be drawn with 0.2 mm thick lines.

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8. ESTRACTIONS

In this chapter all information which can be extracted from the mentioned document, andinitially reported into synthetic print-offs, called working printings, are identified (seefigures 2 and 3). These present only the data associated or held in the graphic part. Suchdata can then be transferred to following documents. The most important documentsderiving their first information from the mentioned printings are:

the equipments list the electric users list the cables list.

In the case of computer-based tools used to produce the mentioned drawings, we couldthink, besides the extraction of suitable files contributing to the production of the said

Iists, of extracting also those information attributed to the equipments in the relatedtables, in order to make up the basis for a possible automatic production of theequipments data sheets.

Information that can be derived from the OLD are:

Equipments: equipment identification abbreviation goods description or service belonging package OLD identification, sheet and revision coordinates in the sheet

electric usersConnections connection identification

connection composition current intensity (flow) tension level connection length origin (from) branch type (if present) end (to) arrival type (if present) OLD identifications, sheets and revisions

Electric users:

all the data in the table.

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9. EXAMPLE

see the annex example

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FIGURE 1

PREPARATION EXAMPLE OF POWER USERS TABLE

BOARD BRANCH BRANCH POWER ELECTRIC USERS CELIDENTIF. TYPICAL PROGRESS. (kW) Identif. Description

A920EP001 M010 5 300 A520KA001A COMPRESSOR CENT 1A6 300 A520KA001B COMPRESSOR CENT 1B7 500 A540PA003 CENTRIFU. PUMP 2C8 700 A540PA007A GLYCOL PUMP 3A9 700 A540PA007B GLYCOL PUMP 4A

M015 11 75 A550PA001A DRAIN SUCT.PUMP 1C12 75 A550PA001B DRAIN SUCT.PUMP 1D13 5 A590PC001A PUMP 4B14 5 A590PC001B PUMP 4C

15 5 A590PC001C PUMP 4D16 SPARE 2B

A920EP002 M010 21 150 A520KB001 COMPRESSOR 1A22 500 A920EL002 LIGHT 2A23 SPARE 2B

A920EL001 XXXX 19 3 EXT.CAB.ELE 1A18 3 EXT.FABB.MULT 1B17 3 EXT RIG COMP. 1C20 3 EXTCOLUMN ZONE 1D10 3 EXT MEASURE BLDG 1E

ecc. ecc. ecc. ecc.

On the right of the table there should be a column where to mark the revision number ofthe interested fine in the table; keep in mind that the indication of previous revisionsshould be canceled.

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FIGURE 2

WORKING PRINTING FOR ELECTRICAL EQUIPMENT

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FIGURE 3

CAD WORKING PRINTING FOR ELECTRICAL CONNECTIONS

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