60006317-Air-Cooler-1

AIR-COOLED HEAT EXCHANGER(ACHE) LAYOUT

By

VIPIN.SPIPING-MATERIALSTECHNIP INDIA

19TH JAN 2007

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INTRODUCTION:

WHAT IS AN AIR COOLED HEAT EXCHANGER(ACHE)?

API 661 – AIR COOLED HEAT EXCHANGER FOR GENERAL REFINERY SERVICE

CONSTRUCTIONAL DETAILS

ONE OR MORE BUNDLES OF HEAT TRANSFER SURFACES

AIR MOVING DEVICE-FAN,BLOWER

POWER TRANSMISSION DEVICE TO MECHANICALLY ROTATE FAN,BLOWER

A PLENUM BETWEEN BUNDLES AND FAN

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TYPES OF ACHEINDUCED DRAFT

FORCED DRAFT

A- FRAME CONFIGURATION

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WE HAVE COME ACROSS AIR COOLERS ON FOLLOWING PROJECTS

GONFREVILLE

KHARGH ETHYLENE

QATAR GAS-II ( BOTH IN INLET AREA

AND UTILITY AREAS)

RASGAS-III ( UTILITY AREA)

QCS (INLET AND UTILITY AREAS)

YLNG (COMPRESSOR AREA-UNIT47)

KHURSANIA PROJECT

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LAYOUT REQUIRMENTS OF AIR COOLED HEAT EXCHANGER (ACHE)

AREA OF LOCATION FOR ACHE:

1. ON TOP OF MAIN PIPE RACK

• MOST COMMON LOCATION

• PIPE RACK SPACING TO BE SPECIFIED WHEN SENDING ENQUIRIES FOR COOLERS

• CLIENT APPROVAL REQUIRED FOR LOCATING ACHE ON TOP OF RACK

2. ON A SEPARATE ELEVATED STRUCTURE

• MUST BE POPERLY ELEVATED TO FACILITATE GRAVITY FEED SYSTEM

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PROVIDE ROOM FOR CRANE ACCESS FOR MAINTENANCE

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ACCESS PLATFORMS ON EITHER SIDE TO ACCESS HEADER BOX

CHECK FOR THE ROOM CLEARENCES OVER ACCESS PLATFORMS

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IN GENERAL AVOID LOCATING PUMPS, PRV, AND CONTROL VALVESBELOW ACHE

VIBRATIONAL REQUIRMENTS HAS TO BE CONSIDERED WHILE DESIGNING

THERMAL MOVEMENT FOR LAYOUT CONSIDERATION SHALL BE FURNISHED BY THE VENDOR.

CHECK FOR THE NO. OF PASSES

NO. OF BUNDLES NEEDS TO BE KNOWN FOR KNOWING THE NO.OF NOZZLE AVAILABLE.

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PIPING LAYOUT REQUIRMENTS

CORRECT CONFIGURATION OF PIPING TO GIVE EQUAL OR NEAR EQUAL DISTRIBUTION

PIPING FROM OVERHEAD AS SHORT AS POSSIBLE TO MINIMIZE PRESSURE DROP

ROUTING SHOULD BE FLEXIBLE TO AVOID OVERLOADING OF NOZZLES

PROVIDING SUITABLE PIPE SUPPORTS AND ANCHORS

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PIPING CONFIGURATIONS

• CASCADE AND SYMMETRICAL RAKE SHOWS GOOD DISTRIBUTION

• ASYMMETRICAL RAKE SHOWS BAD DISTRIBUTION

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• ROUTE LINE IN ECONOMICAL PATH.

• CHECK FOR ACCESSIBILITY OF VALVES• CHECK FOR FLEXIBILITY ( GENERALY DONE IN DETAILED STAGE)• SUPPORTING CRITERIA SHALL GE CHECKED

( GENERALY DONE IN DETAILED STAGE)

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TOWER TO COOLER PIPING

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SIDE MOUNTED INLET HEADER

• MIN INLET PIPE RUN

• LESS FLEXIBLE

CENTRALLY MOUNTED INLET HEADER

• LONG INLET PIPE RUN

• MORE FLEXIBLE

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SYMMETRICAL RAKE

ARRANGMENT

AIR COOLER ARRANGMENT IN

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• UNIFORM DISTRIBUTION

• LINE SUFFICIENTLY FLEXIBLE

• MIN. PIPE RUN FOR INLET LINES

• LINES ARE NOT OBSTRUCTING MAINTENANCE ACCESS

AIR COOLER ARRANGMENT IN

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CASCADE ARRANGMENT

AIR COOLER ARRANGMENT IN KHURSANIA PROJECT

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• MINIMUM INLET PIPE RUN

• NO INDIVIDUAL ISOLATION VALVES

AIR COOLER ARRANGMENT IN KHURSANIA PROJECT

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AIR COOLER ARRANGMENT IN KHURSANIA PROJECT

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