tech. spec. for heat exchangers

7/29/2019 Tech. Spec. for Heat Exchangers

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INDIAN OIL CORPORATION LIMITEDREFINERIES DIVISION

IOCL/R/ML/HEAT EXCHANGERS/2006 - REV 0TECHNICAL SPECIFICATION

FOR HEAT EXCHANGERS Page 1 of 5!

ThisdocumentispropertyofIndianOilCorporationLimited.

Thesearemerelyloanedontheborrower'sagreementthatthesew

illnotbereproduced,copied,

loaned,exhibitedno

usedexceptinthelimitedwayandprivateusepermittedbyanywrittenconsentgivenbythelendertotheborrower.

!

OnlyIndianOilCorporationholdsthesolerightofeditingthisdocumentatanytim

eseeingthemarketconditionsanddevelopments

inthefield

IndianOil

TECHNICAL SPECIFICATION

FOR

HEAT EXCHANGERS


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1.0 REFERENCES:

1.1 Design codes

The following codes in their latest edition shall form basis for design,manufacture, testing and acceptance of equipment

A) A S M E Boiler & Pressure Vessel Code Sec. VIII div. IB) B) A S M E Boiler & Pressure Vessel Code Sec.IXC) Indian Boiler Regulations- I B R wherever applicableD) T E M A

1.2 Material codes

Material supplied by the fabricator shall be inspected and accepted inaccordance with relevant provisions of ASME boiler & pressure vessel codesection ii or is specified in their latest edition or IBR as per applicability.

2.0. Rolling and dishing of plates

A) Rolling: Rolling of plates shall be in the longitudinal direction of plates. Thisdirection shall be clearly marked on the plates. Rerolling of plates afterwelding is not allowed.

B) Dishing Head shall be formed / pressed as a single piece. Headprofiles shall be exactly as per dimensions of drawing. All CS & AS headsshall be heat treated after forming as per requirement of code.

3.0 Staggering of weld seams

Longitudinal weld seams shall be staggered with a minimum circumferentialdistance between the centre of welds of 5 times of thickness of thicker plate.Weld seams shall be so located as to avoid fouling with Connections andexternal attachments.

4.0 Inspection & testing:

4.1 All vessels shall be offered for inspection to purchaser or his authorizedinspector.

4.2 Inspector shall have free access to all workshops of contractor or sub-contractors.


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4.3 Inspection shall be carried out both during fabrication and before delivery and forsub-ordered materials.

Inspection shall be at all stages of fabrication including but not limited to followingA) Raw material identificationB) Edge preparation for welding including visual check for laminations.C) Alignment of longitudinal weld seamsD) Root pass clearing before weldingE) Rolling tolerances on individual sectionsF) Alignment of sectionsG) Nozzle settingH) Dimensional checkI) Radiographic / DP /MP examinationJ) Any other as per requirement of inspector

5.0 Radiography

The extent of radiography shall be as specified on specification sheet.

A) When spot radiography is specified, the following requirement shallsupplement the requirements specified in ASME Sec-VIII Div. 1.

The extent of radiography shall be limited to 10% of total weld length inclusive ofall "T" joints, weld start points and longitudinal and circumferential weld seams.Length of each radiograph shall be 250mm, all "T" joints must be radiographerand at least one shot must be taken on each longitudinal & circumferential seam.

For welds subjected to either full or spot radiography, imperfections permitted in

ASME code Sec-viii clauses UW-51 & UW-52 will not be acceptable.

A) All A.S Surfaces shall be 100% radiographed.

6.0 Hydrostatic & other tests

These tests shall be witnessed by the authorized inspector. Test pressure shallbe maintained for at least 60 minutes. The vessel shall be dried by hotcompressed air after hydrotest.

7.0 Shop painting

AS/ CS surfaces other than flange faces & other machined surfaces, shall begiven two coats of heat resistant primer of 50 microns dft after surfacepreparation. Total dft shall be 100 microns.

8.0 Knuckle and crown radius of torispherical-dished ends shall be 15%(min) and80% respectively of outside of dished heads.


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9.0 Materials

Materials shall meet code requirements. In addition, the following requirements

shall also be complied with:

A) Pipes

All pipes shall be seamless. All CS pipes shall be in "hot finished"condition. Dimensions & tolerances shall be in accordance with ANSI B36-10. Carbon content of CS pipes shall be limited to0.25percentage(max).

B) Plates

All plates of A-515 Gr. 60 shall be in normalized condition. One product

analysis of each heat shall be carried out as a supplementaryrequirement & reported. The carbon content of CS BQ plates shall in nocase exceed 0.25%. All plates shall be examined ultrasonically after heattreatment

As per applicability of thickness as per ASTM A-435 & A-578.

C) Forgings

All CS / AS forgings shall be in normalized condition. Carbon content ofCS forgings shall be limited to 0.25%(max).

D) Tubes

Tubing shall be seamless in the fully heat-treated condition as receivedfrom mill.

10.0 Materials in vendor's shop shall be inspected by Owners Representative/ ThirdParty Inspection (TPI) agency. Mill test certificates only are not acceptable.

11.0 Vendor shall submit one copy of the design calculation for the complete vesselalong with drawings before any prefabrication works to IOCL.

12.0 Detailed fabrication engineering drawings shall be prepared by the vendor and

shall be submitted to the Owners Representative/ Third Party Inspection (TPI)agency for final approval prior to any prefabrication works. HOWEVER, IOCLapproval will not absolve the party from the design responsibilities.

13.0 The inspection shall be carried out by Owners Representative/ Third PartyInspection (TPI) agencyas per ASME & other applicable Codes.


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14.0 Lifting lugs, pipe support cleats, platform cleats etc shall be provided as per therequirements.

15.0 All threads on studs / nuts shall be fully threaded.

16.0 Tubes shall be examined into the tube sheet for a length equals to four timesoutside diameter or the tube sheet thickness minus 3mm whichever is smaller. Inno case shall the expanded portion extend beyond the shell side face of the tubesheet. The expanding procedure shall provide substantially uniform expansionthroughout the expanded portion of the tube without a sharp transition to theunexpanded portion.

17.0 All tube sheet holes and the grooving in them shall conform to " t e m a " . Tubeholes in tube sheet shall be to special close fit. Grooves shall be squared edgedand concentric.

18.0 Girth flanges shall be drilled and tapped for jackscrews.

19.0 Documentation folder

Vendor shall supply six (6) bound copies of data folder containing the followinginformation:A) Vessel data sheets.B) Vessel as built drawings duly certified & stamped by Owners

Representative/ Third Party Inspection (TPI) agency.C) Certified material test reports, having location, heat nos., chemical

analysis, and physical properties of all materials used in the fabrication of

heat exchangers.D) Welding procedure qualification reports.E) Welder qualification reports.F) Radiography results.G) Ultrasonic / MP / DP test reports.H) Hardness tests (if applicable).I) Record charts duly certified by Owners Representative/ Third Party

Inspection (TPI) agencyshowing complete heat treatment cycle.J) Hydrostatic test reports.K) Rubbing of nameplate.L) Owners Representative/ Third Party Inspection (TPI) agencycertificate in

original on their letterhead.

Vendor shall supply all drawings, data sheets, technical write up etc in electronicmedia.

tech. spec. for heat exchangers

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