Esp-p-6940 Pemex Instrument Piping and Wiring Installation

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GAS Y PETROQUIMICA BASICA

GERENCIA DE PROYECTO Y CONSTRUCCIÓN

SUBGERENCIA DE SERVICIOS TÉCNICOS

PROYECTO: Q-600-64-03

OBRA: “CONSTRUCCIÓN DE DOS PLANTAS CRIOGÉNICASMODULARES Y TERMINAL DE RECIBO YDISTRIBUCIÓN DE GAS LP Y GASOLINAS EN LA

ESTACION 19, AREA DE REYNOSA, TAMPS.”

LUGAR: REYNOSA, TAMAULIPAS

ESP-P-6940SPECIFICATION OF

INSTRUMENT PIPING AND WIRING INSTALLATION



No. ESP-P-6940

REV. 1GAS Y PETROQUÍMICA BÁSICA

GERENCIA DE PROYECTO Y

CONSTRUCCIÓN

GENERALINSTRUMENTATION

SPECIFICATION INSTRUMENTATION Date: NOV-2000

ESP-P-6940.doc.docPágina 2 de 9.

“En PGPB la más alta prioridad es la seguridad de nuestros trabajadores,

nuestros clientes, nuestros vecinos y el medio ambiente

Fecha: 21- Febrero - 2000

Rev 0 Por Gerencia de Proyecto y Construcción Fecha 21 Feb 00

Rev 1 Por Gerencia de Proyecto y Construcción Fecha 21 Nov 00

Rev Por Fecha

Rev Por Fecha

Rev Por Fecha

X

Versión nueva

Cambios en alguna página

Versión reeditada completamente

Preparada por: Pemex Gas y Petroquímica Básica

Fecha: 21- Febrero - 2000.

Por Gerencia de Proyecto y Construcción

Realizó: BNC

Especialista Instrumentación:

Revisó: GZC

Subgerente de Servicios Técnicos

Vo. Bo. MLF

Director de Proyecto



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SPECIFICATION ESP-P-6940


TABLE OF CONTENTS

SECTION PAGE

1.0 SCOPE ................................................................................................................................4

2.0 REFERENCE CODES, STANDARDS AND SPECIFICATIONS........................................5

3.0 GENERAL INSTALLATION DESIGN....................................................................................5

4.0 DESIGN INSTALLATION......................................................................................................6

5.0 DRAWING PROCEDURE ...................................................................................................9



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SPECIFICATION ESP-P-6940


1.0 SCOPE

1.1 This specification covers the design, layout and drawing procedures for location,support and piping of field mounted instruments that are not an integral part of apiping system.

1.2 Instrument Installations include:

1.2.1 All instrument process and utility piping and piping components,except the valve connections used to connect instruments to other piping or equipment.

1.2.2 All instrument air and pneumatic lines, except the main instrument air header and its valve connections.

1.2.3 Support for instruments and tubing.

1.2.4 Instrument wiring and cable installation to the field junction boxes, andInstrument Homerun Conduit/Cable to the Control Room.

1.3 Excluded Instruments

The following instruments are excluded from this specification :

Meter Runs – Orifices, flow nozzles and venturi tubes.

Control Valves - Piping Manifolds

Displace Type Level Instruments, Magnetic Level Instruments, Level Gauges

and Level SwitchesRelief Valves - Piping and Location

Thermowells and Skin Thermocouple Installations.

Steam Traps and Drip Pot Pipping.



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Positive Displacement Meters.

Rotameters.

2.0 REFERENCE CODES, STANDARDS AND SPECIFICATIONS

The design, material and installation shall generally conform to the requirements of thefollowing documents.

2.1 Codes and Standards

2.1.1 Piping shall be in accordance with American Society of MechanicalEngineers Code for Pressure Piping, ANSI/ASME B31.3, 1996Edition. Including Addenda “Chemical Plant and Petroleum RefineryPiping.”

2.1.2 The limits of piping governed by codes other than ASME B31.3 shallbe indicated on the Piping and Instrument Diagrams (P&ID).

2.2 Specifications

ESP-P-6000 General Instrumentation

ESP-P-6760 Instruments Furnished with Packaged Equipment

ESP-P-6882 Instrument Cable

ESP-P-6883 Thermocouple extension wire and cable

ESP-P-6920 Instrument Installation Material

ESP-P-6970 Instrument Piping systems field pressure testing

2.3 Drawings

The contractor shall elaborate and to provide the typical drawings of instrumentinstallation.

3.0 GENERAL INSTALLATION DESIGN

3.1 Materials

3.1.1 Piping, tubing, and support installation material shall be in accordancewith ESP-P-6920. Any deviations from this specification shall be



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noted on the installation drawing. Installations that are part of packaged items may be to the manufacturer's standards, providing itmeets the specified design and applicable code requirements.

3.1.2 Minimum line size shall be 3/4" for process piping, 1/2" for processtubing, and 1/4“ for pneumatic tubing, except for connections atinstruments, which shall be manufacturer's standard, unlessotherwise specified on instrument specifications.

3.1.3 Cable material shall be in accordance with ESP-P-6882 andESP-P- 6883.

3.2 Seals and Purges

When necessary to prevent corrosive or solids bearing fluids from enteringinstruments, or instrument lines and process fluids from freezing or flushing,diaphragm type seals shall be given first consideration. Purges may be used inplace of seals or heat tracing.

3.3 Field Pressure Testing

Instrument installations shall be field pressure tested in accordance with ESP-P-6970.

3.4 Electrical Testing

Testing shall be in accordance with the specification “Electrical Installation”

4.0 DESIGN INSTALLATION

4.1 Field Instruments Location and Supports

4.1.1 All instruments shall be supported. Standpipes or other suitablemeans shall be used. Support brackets shall not be welded toprocess piping (except as required by piping stress analysis on hightemperature steam lines), stress relieved or internally lined

equipment.

4.1.2 Instrument accessibility shall be in accordance with the AccessibilityChart of this specification. Blind transmitting instruments shall be linemounted near the sensing point. Instruments shall not be linemounted when temperature or vibration from hydraulics or operatingequipment will affect the operation of the instrument, or causedamage to instrument piping.



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4.1.3 Instruments in gas service shall be mounted above the sensing point.Instruments in liquid and steam service shall be mounted below thesensing point. If accessibility, visibility or clearance requirementspreclude either of these situations, provisions will be made in theinstrument-piping configuration to insure proper operation of theinstrument.

4.1.4 Recording and control instruments, except level controllers, shall bemounted remotely at grade or outside of platform handrails.

4.1.5 Remote mounted instruments shall be grouped and have commonsupports.

ACCESSIBILITY CHART

ACCESS REQUIRED

TYPE OF INSTRUMENT I II III IV

Transmitters X

Local Indicators X

Pressure Gauges X

Thermowells X

Self-Contained Regulators XLocal Controllers X

Local Recorders X

Process Actuated Switches X

Frequently Adjusted Instruments X

Emergency Instruments X

Thermocouples X

Control Valves X

I Grade, platform, stairway, permanent ladder below 4.5 m.II. Grade, platform or stairway.

III. Grade only.

IV. Grade, platform stairway, permanent ladder.



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4.2 Field Instruments Clearances

Instruments shall be located to maintain clearances required for walkways,accessways and operation and maintenance of valves and equipment.

4.3 Field Instruments Piping Routing and Support

4.3.1 Instrument piping and tubing shall be routed through pipeways andareas dedicated for the routing of plant piping. Installation shallprotect the piping from damage during plant operation andmaintenance.

4.3.2 Instrument piping and tubing supports, shall be sufficient to maintain

the piping and tubing in a neat manner. Pneumatic tubing shall besupported in raceways.

4.3.3 Access from permanent ladders shall be limited to those caseswhere plot or piping arrangement precludes locating the instrument tobe accessible from grade or platform.

4.3.4 Instrument block valves at piping or equipment connections shall beaccessible from grade, platform, stairway, or permanent ladder,except in a pipeway where all instrument block valves are consideredaccessible.

4.3.5 Indicating instruments which must be visible for automatic controladjustment or manual operation shall be visible from the adjustmentor operating point. If plot or piping arrangement preclude this, other provisions shall be made for indication at the adjustment or operatingpoint. Indicating instruments which are not in the above categoryshall be visible from operating aisles or passageways.

4.3.6 Instrument piping and tubing shall be supported from pipe supports,pipe and any other permanent structure, except as follows:

Instrument piping and tubing shall not be supported from pipe or pipesupports that would be subjected to excessive vibration, or from

uninsulated hot (52o

C (127°F) and above) or cold (5o

C (41°F) andbelow) pipes.

Instrument piping and tubing supports shall not be welded to processpiping, stress relieved equipment or internally lined equipment.



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4.4 Control Room Instruments

Horizontal clearance between the rear of the control panel or console structureand any permanent part of the control room shall be 800 mm minimum.

Instruments, installation material, electrical wiring and structural members whocomprise the control panel or console shall be considered as part of the controlpanel structure. Instrument racks, electrical equipment, etc., located behind thecontrol panel at the control room walls shall be considered as a permanent partof the control room.

5.0 DRAWING PROCEDURE

Instrument Installation Drawings elaborate by the contractor shall show in detailinstrument location, orientation, support, piping arrangement and components.

5.1 Field instrument location and orientation shall be shown on the InstrumentLocation and Conduit Routing drawings. All field instruments shall be shown,except minor components of an instrument system.

5.2 Separate Instrument Installation drawings shall be prepared for Process Piping,Pneumatic Piping, Electrical Wiring, and Support.

Number of drawings required for each of the above categories shall bedetermined by instrument make, model, material class and configuration.

Typical drawings shall be prepared and used for as many instruments aspractical. Field Instrument Installation Drawings may be diagrammatic isometricdrawings. A Bill of Material shall be provided with each Instrument InstallationDrawing.

The Instrument Design Index shall be used to correlate the drawings with proper instrument loop.

5.3 Control panel layout drawings are elevation views. Drawings shall show overallpanel dimensions, vertical height of instruments above floor level, horizontalspacing of instruments and, when applicable, graphic or semigraphic layout.The control panel manufacturer’s shall furnish control panel piping and

fabrication drawings. These drawings shall conform to ESP-P-6000, ESP-P-6760 and the manufacturer's standards.

5.4 Control building rack drawings are elevation drawings. The drawings shall showoverall rack dimensions, vertical height of instruments above floor level,horizontal spacing of instruments, piping and fabrication details.

Esp-p-6940 Pemex Instrument Piping and Wiring Installation

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