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TitleGS EP INS 101
File Size151.8 KB
Total Pages23
Table of Contents
                            BACK TO INS LIST
Scope
Reference documents
Glossary
General instrumentation principles
	Architecture and interconnecting principles
	Instruments supply
Utilities
	Electricity
	Instrument air
	Instrument gas
	Hydraulic
Instruments general requirements
	Instruments definition
	Instrument earthing
	Design and installation of lightning protection
	Instruments identification
	Area classification/protection
	Enclosure protection / environmental aspects
	Heating, winterization and insulation
	General instrument characteristics
	Units
	Instrument accessibility
	Instrument installation
Tubes, cables, junction boxes, field terminal cabinets, etc.
	Tubing and fittings
	Cables
	Wiring
	Junction boxes
	Field Terminal Cabinets (FTC) in technical rooms
	Identification, tagging and labelling
Instrumentation software tools
                        
Document Text Contents
Page 1

Exploration & Production

This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.



GENERAL SPECIFICATION

INSTRUMENTATION

GS EP INS 101

Instrumentation engineering, supply and
construction general requirements





04 10/05 Revised as per marking – Addition of "EP" root to GS identification

03 10/04 Revised as per marking

02 10/03 Full review – Change of Group name and logo

01 10/02 Revised

00 02/01 First Issue

Rev. Date Notes

Page 2

Exploration & Production

General Specification Date: 10/05


GS EP INS 101 Rev: 04



This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.

GS EP INS 101.doc Page 2/23

Contents

1. Scope .......................................................................................................................4

2. Reference documents.............................................................................................4

3. Glossary...................................................................................................................6

4. General instrumentation principles.......................................................................7
4.1 Architecture and interconnecting principles .......................................................................7
4.2 Instruments supply.............................................................................................................8

5. Utilities .....................................................................................................................8
5.1 Electricity ...........................................................................................................................8
5.2 Instrument air.....................................................................................................................8
5.3 Instrument gas ...................................................................................................................8
5.4 Hydraulic............................................................................................................................8

6. Instruments general requirements ........................................................................9
6.1 Instruments definition.........................................................................................................9
6.2 Instrument earthing............................................................................................................9
6.3 Design and installation of lightning protection ...................................................................9
6.4 Instruments identification ...................................................................................................9
6.5 Area classification/protection .............................................................................................9
6.6 Enclosure protection / environmental aspects .................................................................10
6.7 Heating, winterization and insulation ...............................................................................10
6.8 General instrument characteristics ..................................................................................11
6.9 Units.................................................................................................................................19
6.10 Instrument accessibility....................................................................................................19
6.11 Instrument installation......................................................................................................19

7. Tubes, cables, junction boxes, field terminal cabinets, etc. .............................19
7.1 Tubing and fittings ...........................................................................................................19
7.2 Cables..............................................................................................................................20
7.3 Wiring...............................................................................................................................20
7.4 Junction boxes.................................................................................................................21
7.5 Field Terminal Cabinets (FTC) in technical rooms ..........................................................21

Page 11

Exploration & Production

General Specification Date: 10/05


GS EP INS 101 Rev: 04



This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.

GS EP INS 101.doc Page 11/23

6.7.2 Electric tracing
The heating equipment shall be selected in accordance with the required working temperature.

The heating tapes shall satisfy the electrical safety requirements in accordance with the area
classification.

The arrangement of the electric tracing shall be such that the transmitters can be removed for
maintenance purpose without disconnecting the electrical block or heater.

6.7.3 Insulation
The parts of the impulse lines which are filled with high pour point fluids shall be insulated. The
traced impulse lines shall also be insulated. All fittings in the impulse lines shall be accessible
without removing the complete insulation; special markers on the outside of the insulation shall
indicate their location. The material used to insulate the impulse lines is described in
GS EP PVV 771.

6.7.4 Protective shades
Subject to environmental conditions, instruments shall be protected against direct sun radiation
by shades. The shades material shall be stainless steel or fibreglass reinforced polyester.

The shades shall be installed in such ways that easy installation and removal are guaranteed.

6.8 General instrument characteristics

6.8.1 General
Safety and process functions shall be done by different devices.

In the interest of flexibility and standardisation, the components shall be in accordance with
following common characteristics:

All sensors/transmitters and controlled final receivers shall be 4-20 mA 24 VDC.

Sensors/transmitters shall be "Smart" type with a communication protocol based on the
Hart standard.

Valve electro-positioners shall be "Smart" type based on Hart protocol.

Switches will be avoided. Threshold functions shall be based on analogue signals.

Gas detectors shall be analogue. If “smart” type, communication protocol will preferably
be Hart standard.

Fire detection will generally be based on analogue sensors. If “smart” type, Hart standard
shall be preferred. Use of discrete sensors shall be studied on a case by case basis.

In buildings, use of addressable fire detectors shall be considered.

For “smart” safety related instruments, access to configuration shall be protected by
hardware means on the instrument itself.

Instruments using mercury are forbidden.

All inserted instruments (thermowells, vortex, Pitot tubes...) shall conform to ASME PTC 19.3
calculations.

Page 12

Exploration & Production

General Specification Date: 10/05


GS EP INS 101 Rev: 04



This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.

GS EP INS 101.doc Page 12/23

All instruments will be installed with vent and drain facilities and for hazardous and/or polluting
fluids the vent/drain of instruments shall be piped to the vent/drain networks.

In case of dual transmitters (one for Safety, one for Control) for the same process
measurement, they shall have same range and span and the process connections will be fully
independent but shall be close together to allow comparison of measurements. On vessels,
level transmitters tapping points shall be at the same elevation.

Instrument technologies listed here below are the most common ones so this list is not
exhaustive. Other types of instruments could be used according to the interest or context of the
project.

6.8.2 Instrument performance specifications
Figures given for electronic instruments accuracy in the following chapters include the combined
linearity, hysteresis and repeatability errors.

6.8.3 Temperature
Thermowell type shall be one piece thermowell, bored from one piece solid bar stock or
forgings, and shall include a retaining flange. Tapered thermowells with round tip shall be
selected.

Thermowells arrangements are given in GS EP INS 900.

The thermowell standard material is SS 316L. Monel is recommended for seawater services.
Other materials may have to be selected subject to the relevant piping class.

The cover flange shall always meet the relevant piping material requirements for material
selection and dimension.

Thermowells shall be made in conformity with the ASME PTC 19.3 calculations. Frequency and
stress analysis calculations shall be supplied by the MANUFACTURER.

Pre-sizing of the well shall be performed by CONTRACTOR.

Test wells for general use shall be provided with screwed plugs permanently attached by
stainless steel chain.

For pipe 4 inches or less, either an increase in pipe diameter to 4 inches shall be made
(expander and reducer), or the thermowell shall be mounted in a T which replaces a pipe elbow.

Immersion length: the tip of the thermowell shall be located within the second third of the flow
line diameter.

6.8.3.1 Temperature indicators
Bi-metallic temperature indicators shall be supplied as complete assemblies comprising:
indicator, extension nipple and thermowell.

Scale graduations, zero adjustment and over-range protection shall be MANUFACTURER’s
standard. Accuracy shall be within 1 % of span.

Bi-metallic thermometers in service where vibration may be expected shall be either silicone
filled or have other internal dampening means.

Page 22

Exploration & Production

General Specification Date: 10/05


GS EP INS 101 Rev: 04



This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.

GS EP INS 101.doc Page 22/23

7.6.2 Cables and tubes
Cables and tubes shall be labelled at both ends and at all wall or bulkhead penetrations.

Marking will be made of punched SS316L labels attached with stainless steel fasteners.

Use of slip-on pre-printed shrinkable sleeves shall be reserved to applications where risk of
corruption of marking with dirt is very limited; it shall be submitted to COMPANY approval.

7.6.3 Junction boxes and local cabinets
Junction boxes and field cabinets shall be labelled using engraved Trapholyte plates. Letters
shall be 15 mm high.

Plates shall be coloured as follows:

‘Process’ junction boxes: white background with black letters.

‘Safety’ junction boxes: red background with white letters.

‘Intrinsic Safety” junction boxes: blue background with white letters.

All accessories, screws or rivets shall be in stainless steel.

Inside cabinets, instrument labels shall follow the requirements of chapter 7.6.1 with the
exception of letter size which can be reduced to 10 mm.

7.6.4 Colour coding for instrument connections
Unless local rules apply, colour coding for instrumentation electrical connections will be as
follows:

Power supply 220 VAC:

- Black (live)

- Blue (neutral) (compulsory)

- Yellow/Green (Earth) (compulsory)

Power supply 48 VCC or 24 VCC:

- Red (+)

- Blue (-)

Analogue signal:

- Red (+)

- White (-)

Pt 100 Temperature:

- White / Red / Blue

8. Instrumentation software tools
Instrumentation engineering database software will be used for creating the instruments data
base, data sheets and electrical connections.

CONTRACTOR delivery shall include supply of the native files of the “as built” database.

Page 23

Exploration & Production

General Specification Date: 10/05


GS EP INS 101 Rev: 04



This document is the property of Total. It must not be stored, reproduced or disclosed to others without written authorisation from the Company.

GS EP INS 101.doc Page 23/23

The Instrument loop drawings shall be automatically generated from the instrument database by
software, in MicroStation or compatible CAD format.

CONTRACTOR delivery shall include supply, in the electronic format, of the printable drawing
files and interface template files full library in native format.

This database will also include packages instruments, with special mark for data transmitted to
control systems, whatever the link type (serial, hardwired).

The record of all changes will be ensured.

When project development requires different Engineering Contractors, common using rules
shall be defined to issue a same and whole database: database structure, fields syntax,
instruments description…

In case of development of "brown fields", the current database will be extended to prevent any
confusion.

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