Esp-p-6940 Pemex Instrument Piping and Wiring Installation

GAS Y PETROQUIMICA BASICA

GERENCIA DE PROYECTO Y CONSTRUCCIÓN

SUBGERENCIA DE SERVICIOS TÉCNICOS

PROYECTO:

Q-600-64-03

OBRA:

“CONSTRUCCIÓN DE DOS PLANTAS CRIOGÉNICAS MODULARES Y TERMINAL DE RECIBO Y DISTRIBUCIÓN DE GAS LP Y GASOLINAS EN LA ESTACION 19, AREA DE REYNOSA, TAMPS.”

LUGAR:

REYNOSA, TAMAULIPAS

ESP-P-6940 SPECI CIFI FICAT CATION OF

INSTRUMENT PIPING AND WIRING INSTALLATION

GAS Y PETROQUÍMICA BÁSICA GERENCIA DE PROYECTO Y CONSTRUCCI ÓN

No.

GENERAL INSTRUMENTATION

REV.

ESP-P-6940 1

Date: NOV-2000

SPECIFICATION INSTRUMENTATION

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

Versión nueva Cambios en alguna página

X

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

Fecha:

21- Febrero - 2000

ESP-P-6940.doc.doc Página 2 de 9.

“En PGPB la más alta prioridad es la seguridad de nuestros trabajadores, nuestros clientes, nuestros vecinos y el medio ambiente


GENERAL INSTRUMENTATION SPECIFICATION INSTRUMENTATION

No. REV.

ESP-P-6940 1

Date: NOV-2000

SPECIFICATION ESP-P-6940 INSTRUMENT PIPING AND WIRING INSTALLATION 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





No. REV.

ESP-P-6940 1

Date: NOV-2000

SPECIFICATION ESP-P-6940 INSTRUMENT PIPING AND WIRING INSTALLATION 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 a piping system.

1.2

Instrument Installations include:

1.3

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, and Instrument Homerun Conduit/Cable to the Control Room.

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 Switches Relief Valves - Piping and Location Thermowells and Skin Thermocouple Installations. Steam Traps and Drip Pot Pipping.





No.

ESP-P-6940

REV.

1

Date: NOV-2000

Positive Displacement Meters. Rotameters.

2.0

REFERENCE CODES, STANDARDS AND SPECIFICATIONS The design, material and installation shall generally conform to the requirements of the following documents. 2.1

2.2

2.3

Codes and Standards 2.1.1

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

2.1.2

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

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

Drawings The contractor shall elaborate and to provide the typical drawings of instrument installation.

3.0

GENERAL INSTALLATION DESIGN 3.1

Materials 3.1.1

Piping, tubing, and support installation material shall be in accordance with ESP-P-6920. Any deviations from this specification shall be ESP-P-6940.doc.doc Página 5 de 9.





No. REV.

ESP-P-6940 1

Date: NOV-2000

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

3.2

3.1.2

Minimum line size shall be 3/4" for process piping, 1/2" for process tubing, and 1/4“ for pneumatic tubing, except for connections at instruments, which shall be manufacturer's standard, unless otherwise specified on instrument specifications.

3.1.3

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

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

3.3

Field Pressure Testing Instrument installations shall be field pressure tested in accordance with ESP-P6970.

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 suitable means shall be used. Support brackets shall not be welded to process piping (except as required by piping stress analysis on high temperature steam lines), stress relieved or internally lined equipment.

4.1.2

Instrument accessibility shall be in accordance with the Accessibility Chart of this specification. Blind transmitting instruments shall be line mounted near the sensing point. Instruments shall not be line mounted when temperature or vibration from hydraulics or operating equipment will affect the operation of the instrument, or cause damage to instrument piping. ESP-P-6940.doc.doc Página 6 de 9.



No.


ESP-P-6940

REV.

1

Date: NOV-2000


4.1.3

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

4.1.4

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

4.1.5

Remote mounted instruments shall be grouped and have common supports.

ACCESSIBILITY CHART ACCESS REQUIRED TYPE OF INSTRUMENT

I

Transmitters

X

Local Indicators

X

Pressure Gauges

X

Thermowells

X

Self-Contained Regulators

X

II

Local Controllers

X

Local Recorders

X

Process Actuated Switches

X

Frequently Adjusted Instruments

X

Emergency Instruments

III

IV

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.




4.2


No. REV.

ESP-P-6940 1

Date: NOV-2000

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 and areas dedicated for the routing of plant piping. Installation shall protect the piping from damage during plant operation and maintenance.

4.3.2

Instrument piping and tubing supports, shall be sufficient to maintain the piping and tubing in a neat manner. Pneumatic tubing shall be supported in raceways.

4.3.3

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

4.3.4

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

4.3.5

Indicating instruments which must be visible for automatic control adjustment or manual operation shall be visible from the adjustment or operating point. If plot or piping arrangement preclude this, other provisions shall be made for indication at the adjustment or operating point. Indicating instruments which are not in the above category shall 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 pipe supports that would be subjected to excessive vibration, or from uninsulated hot (52oC (127°F) and above) or cold (5o C (41°F) and below) pipes. Instrument piping and tubing supports shall not be welded to process piping, stress relieved equipment or internally lined equipment.




4.4


No. REV.

ESP-P-6940 1

Date: NOV-2000

Control Room Instruments Horizontal clearance between the rear of the control panel or console structure and any permanent part of the control room shall be 800 mm minimum. Instruments, installation material, electrical wiring and structural members who comprise the control panel or console shall be considered as part of the control panel structure. Instrument racks, electrical equipment, etc., located behind the control panel at the control room walls shall be considered as a permanent part of the control room.

5.0

DRAWING PROCEDURE Instrument Installation Drawings elaborate by the contractor shall show in detail instrument location, orientation, support, piping arrangement and components. 5.1

Field instrument location and orientation shall be shown on the Instrument Location 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 be determined by instrument make, model, material class and configuration. Typical drawings shall be prepared and used for as many instruments as practical. Field Instrument Installation Drawings may be diagrammatic isometric drawings. A Bill of Material shall be provided with each Instrument Installation Drawing. 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 overall panel dimensions, vertical height of instruments above floor level, horizontal spacing 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-P6760 and the manufacturer's standards.

5.4

Control building rack drawings are elevation drawings. The drawings shall show overall 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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