PDVSA N TITLE

REV. DATE DESCRIPTION PAG. REV. APPD. APPD.

APPD.BY DATEDATE

VOLUME 8

PDVSA, 1983

EC201 AIR COOLED HEAT EXCHANGERS

FOR APPROVAL

Alexis Arvalo Enrique CarmonaDEC. 00 DEC. 00

ENGINEERING SPECIFICATION

MAR.87

DEC.00 Y. K.

J.S.

1

0

GENERAL REVISION 3

24

A. A.

J.G.

E. C.

A.O.

ENGINEERING DESIGN MANUAL

ESPECIALISTAS

APPD.BY

REVISION FECHA

ENGINEERING SPECIFICATION

AIR COOLED HEAT EXCHANGERS DEC.001

PDVSA EC201

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FOREWORD

This specification covers the minimum requirements for the design andfabrication of Air Cooled Heat Exchangers used in the petroleum andpetrochemical industry.

This specification is intended to supplement API Standard 661, Fourth Edition,November 1997, which is part of this specification. Paragraph numbers of thisspecification correspond to those in API 661. Paragraph numbers not found in API661 are new paragraphs.

Paragraphs shall be highlighted as shown below to indicate the type of changefrom the API Standard:

(Addition) New paragraph or supplemental requirements/clarifications to anexisting paragraph.

(Deleted) Paragraph deleted.

(Decision) A decision has been made as required.

(Substitution) Paragraph supersedes API in its entirety.

1 SCOPE(Substitution) This specification, together with the Equipment Data Sheet, coversrequirements for the design, materials, fabrication, inspection and testing ofAirCooled Heat Exchangers. Instructions for marking, shipping and thesubmission of bids and Manufacturer drawings are also given.

1.2 Conflicting Requirements

1.2.1 (Substitution) In case of conflict between documents, the following order shallprevail:

The purchase order

The Project specification

PDVSA EC201

API Std. 661

2 REFERENCED PUBLICATIONS(Addition) In addition to the latest edition of the Codes and Standards referencedin the API 661, the following specification shall be considered a part of thisstandard:

Petroleos de Venezuela S.A. (PDVSA)

O201 Seleccin y Especificaciones de Aplicacin de PinturasIndustriales.

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REVISION FECHA

ENGINEERING SPECIFICATION

AIR COOLED HEAT EXCHANGERS DEC.001

PDVSA EC201

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American Society for Testing and Materials (ASTM)

A450 General Requirements for Carbon, Ferritic Alloy and AusteniticAlloy Steel.

5.1 Approval Information

5.1.1 (Addition) o. Headers details showing dimensions, thickness, corrosionallowances, nozzles reinforced pads, etc.

6.1.1 General Requirements

6.1.1.9 (Substitution) The minimum Thickness of metal used for air seal construction shallbe 3 mm (1/8 in) inside and outside the bundle side frame.

6.1.6.1 General

6.1.6.1.10 (Addition) Horizontal pass partition shall have a 6 mm ( in) orifice for drainage.

6.1.6.1.11 (Addition) For multipasses units, the passes shall be arranged in such a way thatthe inlets and outlets are at the same end.

6.1.6.1.12 (Addition) Where bolted joints are required, only through bolts shall be used.

6.1.9 Nozzles and Other Connections

6.1.9.6 (Substitution) Flange dimensions and facing shall be in accordance with ASMEB16.5. The minimum class for flange sizes below 3 inches shall be 300.

6.1.11.2 (Decision) The maximum tube length shall be 10.4 m (34.5 ft) for exchangers tobe installed at ground level and 9 m (30 ft) for those to be mounted on piperacks.

6.1.11.13 (Addition) The maximum design temperature shall be less than:

For Finned Tube Construction Type C (F)Embedded 399 (750)

Integral 288 (550)Overlapped footed 149 (300)

Footed 149 (300)

6.1.11.14 (Addition) Fins heights exceeding 25 mm (1 in) are not allowed.

6.3.1.7 (Addition) All exchangers which a bottom header elevation exceeding 3 m (10feet) shall have platforms for inspection and service of inlet an outlets nozzles.

7 MATERIALS7.1.8 (Substitution ) For exchangers installed in marine environment, all structural parts

shall be hotdipped galvanized. Other than marine environment, corrosionprotection for structural steel shall be specified by purchaser.

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REVISION FECHA

ENGINEERING SPECIFICATION

AIR COOLED HEAT EXCHANGERS DEC.001

PDVSA EC201

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7.1.11 (Addition) All nozzle pipes shall be seamless ASTM A106 or API 5L.

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