Electrical and Instrumentation Requirements for Simple Packa.pdf

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TECHNICAL SPECIFICATIONELECTRICAL AND INSTRUMENTATION

REQUIREMENTS FOR SIMPLE PACKAGEDEQUIPMENT IS110E BASE

DATE: 03 APR 2003 ENGINEERING SERVICES BY KBR TECHNICAL SERVICES, INC. PAGE 1 OF 4

TABLE OF CONTENTS

Section Title Page No.

1. GENERAL ......................................................................................................................................11.1 Scope..............................................................................................................................................11.2 Codes and Industry Standards .......................................................................................................11.3 Government Regulations................................................................................................................11.4 General Requirements....................................................................................................................12. INSTRUMENT SPECIFICATIONS .................................................................................................23. ELECTRICAL REQUIREMENTS ...................................................................................................34. ADDITIONAL REQUIREMENTS....................................................................................................4

1. GENERAL

1.1 Scope

This specification defines minimum technical requirements for instrumentation and controls incorporated onsimple general purpose skid package units.

1.2 Codes and Industry Standards

Applicable requirements in the latest edition, revision, or addendum of the following codes, standards, andreferences shall be considered an integral part of this Specification. Requirements modified by thisSpecification, Purchaser’s referenced drawings, or a purchase order shall take precedence over publishedspecifications.

FLUID CONTROLS INSTITUTE (FCI)FCI 70-2, "Control Valve Seat Leakage"

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70, "National Electrical Code" (NEC)

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA ICS 6, "Industrial Control and Systems Enclosures"

UNDERWRITERS LABORATORIES (UL)UL 98, "Safety Enclosed and Dead-Front Switches"UL 198E, "Safety Class R Fuses"

1.3 Government Regulations

Federal Standards and Instructions of the Occupational Safety and Health Administration (OSHA), including anyrequirements by state or local agencies that have jurisdiction where the equipment will be installed, shall apply.

1.4 General Requirements

1.4.1 Neither mercury nor asbestos shall be permitted.

1.4.2 Instruments and electrical components and materials shall be listed by a recognized national testinglaboratory.

1.4.3 All pre-wired assemblies shall be UL listed or approved by a testing organization acceptable to theauthority having jurisdiction.

1.4.4 Design, material, equipment, and installation shall meet the specified electrical area classification. Ifpurging is required to meet the area classification, then Purchaser acceptance is required.






2. INSTRUMENT SPECIFICATIONS

2.1 The entire instrumentation system shall be fully assembled and piped.

2.2 Instruments that are connected to the process shall have a 3/4 inch block and bleed valve.

2.3 Instruments shall be located and installed such that accuracy and reliability are not impaired by vibration,pulsation, temperature, or contamination. Length of impulse lines connected to process pipelines or equipmentshall be minimized. Instruments must be accessible.

2.4 Process transmitters shall be used instead of process switches (e.g., level, flow, pressure temperature,etc.). Use of switches requires purchaser approval. Nominal operations shall be between 30% and 70% ofscale range.

2.5 Instruments in steam, liquid, liquid-sealed, or condensing service shall be located below the process

connection, and impulse tubing/piping shall slope continuously down to instruments. Instruments in gas orvapor service shall be located above their process connection point, and impulse tubing/piping shall slopecontinuously up to instrument.

2.6 Instrument support shall be designed and installed in such a way to avoid strain on equipment, pipingconnections, and instruments and shall allow for flexibility required for thermal expansion of equipment andpiping. Dips and/or sags where vapor/liquid can collect in piping and tubing runs shall be avoided.

2.7 Piping from level gauges and external displacer type level instruments shall be self-draining into a vessel orstandpipe. Displacer chambers shall have a maximum allowable working pressure (MAWP) equal to or greaterthan that of the vessel. Level instrument chambers shall not have cast iron bodies. Tubular glass shall not beused in process applications.

2.8 Magnetic level gauges are preferred for hazardous liquid applications. Flat glass reflex type shall be usedfor all other applications. Pad type reflex welded-in gauge glass is acceptable for lube and hydraulic reservoirapplications.

2.9 Automated valves installed in lines smaller than 1 inch shall be line sized. Valves in line sizes 1 inch andlarger shall have a minimum valve body size of 1 inch but not less than half the pipe size. Body sizes shall notbe 1-1/4 inch, 2-1/2 inch, 3-1/2 inch, or 5 inch.

2.10 Automated valve bodies or regulators shall not be cast iron, ductile iron, brass, or bronze, except in wateror air services in non-hazardous classified areas.

2.11 Integral flanged type globe valves are preferred for modulating services. Rotary style valves may beconsidered. Seat leakage shall comply with FCI 70-2 standards. Face-to-face dimensions shall comply withISA standards.

2.12 Ball or rotary valves shall be used for automated on-off service and shall be rated ANSI Class IV shutoffminimum.

2.13 Valve actuators, including springs, shall be designed to fully stroke the valve against unbalanced forces,which can result from a pressure drop across the valve equal to the maximum upstream pressure specified.Control valves shall have electro-pneumatic positioners.

2.14 Packing for automated valves shall be Teflon or glass-filled PTFE for services up to 450°F (232°C )or shallbe graphite-based for services with operating temperatures above 450°F (232°C).






2.15 Sizing of control valves shall be based on ISA valve sizing equations or on sizing programs of approvedvalve manufacturers. In general, valves shall be sized so that the normal flow rate is from 50% to 80% ofmaximum opening of the valve.

2.16 Pneumatic instruments shall normally operate with 3 to 15 psig (21-103 kPa) input and output signals.Each pneumatic instrument shall have an air supply complete with shutoff valve and air set (air filter/regulatorwith output gauge).

2.17 Instrument transmitters shall be HART smart with 4-20 mA output.

2.18 Temperature elements shall be type K thermocouples or 3-wire 100 ohm Pt RTD, unless otherwisespecified.

2.19 Where multiple alarm conditions may exist, the Supplier shall provide a set of voltage free contacts for anexternal common trouble alarm, rated for 120 V AC.

2.20 Temperature-sensing devices shall be mounted in thermowells where exposed to process streams.Preferred installation of the thermowell shall be in a piping elbow pointed toward the flow.

2.21 Unless otherwise specified, purge systems shall be in accordance with NFPA 496 Type Z Classification.

3. ELECTRICAL REQUIREMENTS

3.1 Design, materials, equipment, and installation shall meet the specified electrical area classification.

3.2 The electrical items of the packaged equipment shall be mounted and wired by the supplier. Packagedequipment wiring shall be brought out to identified terminal blocks in skid-mounted junction boxes or controlpanel. Wiring shall be appropriately labeled to identify the device to which it is associated. Junction boxes shallbe located for easy access.

3.3 Wiring shall be separated by voltage level and application as follows: AC power and control; DC power andcontrol; Electronic signal wiring, intrinsically safe and non-intrinsically safe (e.g., separate conduit, separateterminal strips). Design and use of AC power greater than 120 V AC for instrumentation shall require approvalof Purchaser. AC and DC power wiring shall be a minimum of 12 AWG copper THHN/THWN 600-volt rated.Wiring shall be permanently labeled at both ends. If DC power distribution is provided within a local panel,fused terminals shall be used for individual circuit protection unless the terminals are current limited.

3.4 Single conductor panel wiring used for AC and DC signals shall be 18 AWG minimum size, 7-strand copperconstruction, Type ITC, and shall have 90°C insulation suitable for DC circuits in wet or dry locations. Wiringfrom junction boxes to individual instruments shall be shielded twisted pair or triad 16 AWG minimum in conduit.

3.5 Use of AC receptacles shall be minimized but where required shall be the 3-wire type: hot (black), neutral(white), and ground (green), with the ground wire connected to ground per NEC.

3.6 Terminal strips in junction boxes and local panels shall have field external connections on one side andinternal panel connections on the other side.

3.7 Unless otherwise specified, the local panel shall be weatherproofed to NEMA 4X, with all stainless steelconstruction, and suitable for operation in the environmental conditions specified.

3.8 Unless otherwise specified, the junction boxes shall be weatherproofed to NEMA 4X and suitable foroperation in the environmental conditions specified.






3.9 Supplier shall provide opening(s) and designated space for wire and tubing that will be installed afterpackage arrives at site. Field installation shall not require cutting holes in panel or installing hardware inside thepanel to secure Owner-installed wire and tubing. Conduit and cable entries shall be bottom or side. All panel

openings shall be plugged for shipment to prevent water or dirt from entering during shipment or storage prior toinstallation.

3.10 Mechanical protection of wire and cables shall be provided by use of conduit or raceways.

3.11 Rigid conduit and piping shall not be routed over cases of rotating machinery (or other equipment), over orin front of removable heads on vessels and exchangers, nor where such routings would impair the functionalityof inspection openings or panel doors. Drains shall be installed at low points, or a drip loop with a low-pointdrain shall be used to prevent water from draining down conduit system into an instrument or enclosure.

3.12 Liquid-tight, flexible metallic conduit with accepted fittings shall be used in all areas at connections wherevibration, movement or adjustments are likely to occur; this type of conduit shall not be used in Class I, Division1 hazardous (classified) locations.

3.13 Flexible metallic conduits shall be specified and installed to meet the NEC Article 348.

3.14 Conduit seals shall not be poured by Supplier. Supplier shall provide the seals for pouring by others atsite.

3.15 Purchaser will provide an electrical power supply of the voltage; phase and frequency specified. Allequipment and components on the package shall be designed and rated for operation at this voltage.

3.16 Two grounding pads of suitable ampacity shall be provided at diagonally opposite corners of each skid.

4. ADDITIONAL REQUIREMENTS

Instruments, equipment, and enclosures shall be identified before shipment by permanently affixing a name tag,or affixing a stainless steel tag with stainless steel fasteners.

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Electrical and Instrumentation Requirements for Simple Packa.pdf