API-650 Tank Design Detailing-libre

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TANK DESIGN & DETAILING TANK DESIGN & DETAILING Introduction

Introduction

The API 650 standard is designed to provide the petroleum industry with tanks of adequate safety and reasonable

economy for use in the storage of petroleum, petroleum products, and other liquid products commonly handled and

stored by the various branches of the industry. This standard does not present or establish a fixed series of

allowab

allowable tank le tank sizes; instead, it is sizes; instead, it is inteintended to permit the purchaser to select whatever size tank may best meet nded to permit the purchaser to select whatever size tank may best meet hishis

needs. This standard is intended to help purchasers and manufacturers in ordering, fabricating, and erecting tanks; it

is not intended to prohibit purchasers and manufacturers from purchasing or fabricating tanks that meet

specifications other than those contained in this standard.

This standard has requirements given in two alternate

This standard has requirements given in two alternate systesystems ms of units. The rof units. The requiequirements are rements are similasimilar but r but notnot

identical. These minor differences are due to issues such as numerical rounding and material supply. When

applying the requirements of this standard to a given tank, the manufacturer shall either comply with all of the

requirements given in SI units or shall comply with all of the requirements given in US Customary units. The

selection of which set of requirements (SI or US Customary) shall apply to a given tank shall be by mutual

agreement between the manufacturer and purchaser.

Types of tanks (based on

Types of tanks (based on Roof fixing)Roof fixing)

1.

1. FiFixexed Rd Roooof f TTanank k 2.

2. FlFloaoatinting Rg Roooof f TaTank nk

Types of Tank based on Roof Types of Tank based on Roof

1

1.. FFllaat Rt Roooof f 2

2.. CCoonne Re Roooof f 3

3.. DDomomeed d RRoooof f

Types of Floating Roof Tanks Types of Floating Roof Tanks

1.

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2.

2. ExExterternal nal FlFloatioatinng Roog Roof Tf Tanank k

Mani Parts of Tank Mani Parts of Tank

1

1.. TTaannk Sk Shhelelll 2.

2. BBotottotom m plplaatete 3.

3. AnAnnunulalar r PlPlatatee 4.

4. BaBackckining g ststriripp 5.

5. AnAnchor cchor chaihairs anrs and Ancd Anchor bhor bolt aolt arranrrangemgementsents 6.

6. DrDraaw w of of ssumumpp 7.

7. ClCleaeannouout ct caatctchh 8

8.. NNoozzzzlleess 9.

9. ShShelell l mman an wwayay 10.

10. RoRoof man wof man wayay 11.

11. FiFire sre safetyafety 12.

12. PrimaPrimary & Secondary & Secondary Wind girdery Wind girderr 13.

13. Curb anCurb angle or comgle or compressen pressen ringring 14.

14. RoRoof plaof platete 15.

15. CrowCrown pn platelate 16.

16. VenVent Nozzlt Nozzleses 17.

17. OverflOverflow ow pipespipes 18.

18. Roof StructRoof Structures and suures and support spport structurestructures 19.

19. Internal Internal pipe spipe supportsupports 20.

20. Internal mInternal man way rungs and internan way rungs and internal ladder with support clial ladder with support clipsps 21.

21. External caExternal cage Ladder and spiral Staircase laddege Ladder and spiral Staircase ladders and platforms with support clipsrs and platforms with support clips 22.

22. RooRoof handrf handrailailss

For Floating Roof tanks For Floating Roof tanks

1.

1. DDraraiin n sysysstetemm 2.

2. DouDoublble Dee Deck ck or sior singngle Dle Dececk k 3

3.. SSeeal al or or ffououmm 4.

4. PPaanntotoon on LLeeggss 5

5.. DDeecck k lleegsgs 6.

6. RiRim m plaplate & te & rim rim panpantoontoonss 7.

7. RoRolllilin n lladaddederr 8.

8. PaPanntotoon on mman an wawayy 9.

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Standards: Standards: API

API Standard Standard 650, 650, Welded Welded Steel Steel Tanks Tanks for for Oil Oil StorageStorage API

API Standard Standard 620, 620, RecommendRecommended Ruled Rules es for Desifor Design agn and Cnd Construction onstruction of Lof Large arge Welded Welded LowLow Pressure Storage Tanks

Pressure Storage Tanks API

API RP RP 2000, 2000, Venting Venting Atmospheric Atmospheric and and Low Low Pressure Pressure Storage Storage TanksTanks

Standard Selection conditions: Standard Selection conditions:

Atmospheric pressur

Atmospheric pressure no e no refrigerated tanks shall be designed refrigerated tanks shall be designed to API to API 650. 650. Closed Top subjectClosed Top subject to low

to low pressure shall additionally satisfy Appendix F.pressure shall additionally satisfy Appendix F.

Higher pressure tanks up to 15 psig shall comply with API 620 and shall include all API 650 Higher pressure tanks up to 15 psig shall comply with API 620 and shall include all API 650 requirement

requirements for s for materials and examinations.materials and examinations.

API 650 tanks with wall thickness up to and including 0.5 inch shall be to Appendix A except API 650 tanks with wall thickness up to and including 0.5 inch shall be to Appendix A except that Group I materials of T

that Group I materials of Table 2-3 shall not be able 2-3 shall not be used below 20used below 20F.F.

Shop assembled API 650 tanks shall comply with Appendix J except that a minimum of spot Shop assembled API 650 tanks shall comply with Appendix J except that a minimum of spot radiography shall be applied with joint efficiency of 0.85.

radiography shall be applied with joint efficiency of 0.85.

1. TANK GA PREPARATION: 1. TANK GA PREPARATION:

1. Fix the layout for tank overall dimensions in elevation, top view and side view. 1. Fix the layout for tank overall dimensions in elevation, top view and side view. 2. Compare the overall dimensions and reference dimensions

2. Compare the overall dimensions and reference dimensions

3. To draw all the attachments and tank parts should be maintain completely 1:1 scale 3. To draw all the attachments and tank parts should be maintain completely 1:1 scale

4. Put all the orientation for Man ways , draw of sump, Nozzles and internal and external ladder 4. Put all the orientation for Man ways , draw of sump, Nozzles and internal and external ladder clips, earthing boss or Clips, wind girder, lightning clips, piping support clips and etc.

clips, earthing boss or Clips, wind girder, lightning clips, piping support clips and etc. 5. All nozzle sizes and standards, schedules, type of flanges to be used, type of faces to 5. All nozzle sizes and standards, schedules, type of flanges to be used, type of faces to

Be used i

Be used in flanges, if n flanges, if required any blind flanges, Davirequired any blind flanges, Davit Man ways, hit Man ways, hinged type man nged type man ways,ways, Vent and all nozzle elevation should be Fixed in Bottom of tank (bottom of shell plate). These Vent and all nozzle elevation should be Fixed in Bottom of tank (bottom of shell plate). These items should be come in nozzle Details.

items should be come in nozzle Details.

6. General notes, assembly notes are added in notes. 6. General notes, assembly notes are added in notes.

7. Which type of materials used in tank and attachment parts is come in material of 7. Which type of materials used in tank and attachment parts is come in material of Construction.

Construction.

8. Add the design notes in Design Data table 8. Add the design notes in Design Data table

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9. Total weight of the tank and centre of gravity should be added. 9. Total weight of the tank and centre of gravity should be added.

10. If any internal (or) external surface preparation is there, this notes also added. 10. If any internal (or) external surface preparation is there, this notes also added. 11. Client gives any standards to be follow the tank detailing, that standard also should 11. Client gives any standards to be follow the tank detailing, that standard also should

Give

Give the the Standard Standard requirementsrequirements

12. If any tolerance given, that is also added in overall dimensions 12. If any tolerance given, that is also added in overall dimensions 13. Structural also added in the GA drawing.

13. Structural also added in the GA drawing. 14. If any legends there these items also include 14. If any legends there these items also include Major dimensions specified in GA Drawing Major dimensions specified in GA Drawing

1.

1. TaTannk k tototatal l hheieighghtt 2

2.. TTaannk k IIDD 3.

3. TanTank plk plate tate thichicknekness iss in vin via coa courseurse 4.

4. If If any any wind wind girder girder is is there there that that elevelevation ation should should be be addedadded 5.

5. Nozzle Nozzle orientatiorientations anons and ladd ladder posider positions (intions (internal or external or external), lternal), ladder cladder clipsips And piping supports, all attachments. etc

And piping supports, all attachments. etc 6.

6. NozzNozzle elle elevatievations (X,ons (X,Y) miY) minimnimum two dium two dimenmensisionsons 7.

7. If RIf Roof Nozzloof Nozzle there there, that case, that case ane angel angel and distand distance for cence for center linter line of tane of tank k 8.

8. StructuraStructural cl column olumn to colto column umn distancdistances ovees overall lenrall length for gth for columcolumnsns 9.

9. SuSummp p OrOriienentattatiionon

SURFACE PREPARATION AND PAINTING: (Example) SURFACE PREPARATION AND PAINTING: (Example)

SURFACE PREPARATION AND PAINTING SURFACE PREPARATION AND PAINTING

Design Data

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NOZZLE DATAS: (Example) NOZZLE DATAS: (Example)

STANDARDS, SPECIFICATIONS: (Example) STANDARDS, SPECIFICATIONS: (Example)

MATERIAL OF CONSTRUCTION

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Pressure rating Pressure rating

Design pressures up to 500 mbar: Design pressures up to 500 mbar:

Non-pressure, up to 10 mbar Non-pressure, up to 10 mbar Low-pressure, up to 25 mbar Low-pressure, up to 25 mbar High-pressure, up to 60 mbar High-pressure, up to 60 mbar Very high-pressure, up to 500 mbar Very high-pressure, up to 500 mbar Maximum negative pressure = -20 mbar. Maximum negative pressure = -20 mbar. Valid for negative pressure = up to -8.5 mbar Valid for negative pressure = up to -8.5 mbar Temperature range is from 300ºC down to -40ºC Temperature range is from 300ºC down to -40ºC..

SHELL DEVELPOMENT DRAWING SHELL DEVELPOMENT DRAWING Vertical Joints in Shell

Vertical Joints in Shell

Butt joints with complete penetration and complete fusion as attained by Butt joints with complete penetration and complete fusion as attained by double Welding or by other means which will obtain the same quality of joint double Welding or by other means which will obtain the same quality of joint

Horizontal Joints in Shell Horizontal Joints in Shell

Complete penetration and complete fusion butt weld. Complete penetration and complete fusion butt weld.

Shell to Bottom Plate Joint Shell to Bottom Plate Joint

Contin

Continuous fillet weld laid on each side of tuous fillet weld laid on each side of the shell plate. The size of each weldhe shell plate. The size of each weld shall be the thickness of the thinner plate

shall be the thickness of the thinner plate..

1.

1. SheShell platll plate devee developmlopment detaient detail (usl (use pi * D e pi * D foformulrmula, D is mean dia, D is mean dia of tank)a of tank) 2.

2. CuCuttitting ng laylayout out dradrawiwingng 3.

3. SheShell plll plate to ate to AnnAnnular plular plated wated welelding ding detaidetaill 4.

4. shell shell plate to Shplate to Shell ell plate (lplate (longitudinongitudinal and al and circcircumferenceumference) welding ) welding detaildetailss 5.

5. WinWind Gid Girder rder to shto shell ell plate plate welwelding ding detaidetaill 6.

6. WinWind Gid Girder trder to Wino Wind gid girder rder weldiwelding dng detailetailss 7.

7. Curb Curb anglangle to she to shell ell plate plate welwelding ding detaidetaill 8.

8. BiBill ll of of mamateteririalalss 9.

9. GeGeneneraral l nnototeses 10.

10. Section ViewSection Views for plate to plate welding details for plate to plate welding detailss

Shell plate Development Drawing involved components Shell plate Development Drawing involved components

1.

1. NozzlNozzle od ane od and Rf pd Rf pad od lad od locatiocations anons and dimd dimensiensionsons 2.

2. Man way Man way od and mod and man way Rf an way Rf pad od lpad od locatiocations anons and clean od clean out catut catchch 3.

3. EartEarthinhing Boss or clig Boss or clips locatps locationions and overs and overall dimall dimensiensionsons 4.

4. LighLightening clipstening clips, Piping supp, Piping supports clips (X orts clips (X or Y dimor Y dimension anension and plate weld plate weld line to clip end line to clip endd dimension

dimension 5.

5. WinWind Gid Girder rder posipositiontions ans and wed weldilding jng jointsoints 6.

6. CuCurb rb ananglgle le lococatatiiononss 7.

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Shell course design details one foot method

Shell course design details one foot method (example)(example)

Allowable steel

Allowable steel stresses:stresses:

To keep the selection of shell plate material within the band of

To keep the selection of shell plate material within the band of carbon and carbon manganesecarbon and carbon manganese

weldable steels the maximum allowable design stress which may be used is 260 N/mm2 or two weldable steels the maximum allowable design stress which may be used is 260 N/mm2 or two thirds of the material, specified minimum yield strength at room temperature, whichever is the thirds of the material, specified minimum yield strength at room temperature, whichever is the lower. This limit of 260 N/mm'

lower. This limit of 260 N/mm'

discourages the use of steels with a minimum specified yield strength in excess of

discourages the use of steels with a minimum specified yield strength in excess of 390 N/mm2,390 N/mm2, because of their increased hardness and reduced weldability

because of their increased hardness and reduced weldability.. (CL 3.6.3.2, TABLE 3.2

(CL 3.6.3.2, TABLE 3.2 & CL 3.6.1.1 Note:1of API-650)& CL 3.6.1.1 Note:1of API-650) tttt = 4.9 D (H-0.3 = 4.9 D (H-0.3)/St )/St - Hydro - Hydro test thick test thick

ttdd = 4.9 D (H-0.3)G/Sd + CA – Design calculated thick. = 4.9 D (H-0.3)G/Sd + CA – Design calculated thick.

D – Dia of tank D – Dia of tank

H – Design Liquid level H – Design Liquid level G – Specific gravity of liquid G – Specific gravity of liquid Sd – 2/3 of yield stress

Sd – 2/3 of yield stress 2/5

2/5 of of tensile tensile stressstress

Less value only taken Less value only taken

St –3/4 of yield stress St –3/4 of yield stress

3/7

3/7 of of tensile tensile stressstress

Less value only taken Less value only taken

Thickness of the bottom course or ring, which is

Thickness of the bottom course or ring, which is restricted by API 650 restricted by API 650 to ato a maximum of

maximum of 1¾ inch1¾ inch..

Shell course Shell course (Number from (Number from Bottom most Bottom most)) Considered Considered Material Material Specification Specification Ht Ht of of Course Course (m) (m) Assumed Assumed Thickness Thickness (mm) (mm) Nominal Nominal Tank Dia Tank Dia (m) (m) Ht from Ht from Bottom of Bottom of Courses to Courses to Bottom of Bottom of overflow overflow nozzle (m) nozzle (m) Sd Sd (Mpa) (Mpa) (C.A) (C.A) (mm) (mm) Cal. Cal. Thick Thick (mm (mm)) Hydro Hydro test test Thick Thick (mm) (mm) Provided Provided Ht(m)x Ht(m)x Thk.(mm) Thk.(mm) course course First (Bottom First (Bottom most) most) S355 J 2 G 3 FFS355 J 2 G 3 FF 2.5 2.5 1212 36.012 36.012 11.71911.719 11996 6 11..5 5 1111..557 7 99..6 6 22..55mmxx1122mmmm S Seeccoonndd SS33555 5 J J 2 2 G G 3 3 FFFF _2.5_2.5 ₁₀₁₀ 36.010 36.010 9.2199.219 ₁₁₉₉₆₆ ₁_1..5₅ ₉_9..3₃₇₇ _7..5₇ ₅ ₂_2..5_5m_mx_x1₁₀_0m_mm_m T Thhiirrdd SS33555 5 J J 2 2 G G 3 3 FFFF _2.5_2.5 ₈₈ 36.008 36.008 6.7196.719 ₁₁₉₉₆₆ ₁_1..5₅ ₇_7..1₁₆₆ ₅_5..4₄ ₂_2..5_5m_mx_x8_8m_mm_m F Foouurrtthh SS22335 5 JJRRG G 2 2 FFNN _1.5_1.5 ₆₆ 36.006 36.006 4.2194.219 ₁₁₅₅₇₇ ₁_1..5₅ ₅_5..8₈₂₂ ₄_4..0₀₄_{4 1}_1..5_5m_mx_x6_6m_mm_m F Fiifftthh S2S2335 5 JJRRG G 2 2 FFNN _1.5_1.5 ₆₆ 36.006 36.006 2.7192.719 ₁₅₁₅₇₇ ₁_1..5₅ ₄_4..1₁₆₆ ₂_2..5₅₀_{0 1}_1..5_5m_mx_x6_6m_mm_m S Siixxtthh SS22335 5 JJRRG G 2 2 FFNN ₁_1..4₄₂₂₅₅ ₆₆ 36.006 36.006 1.2191.219 ₁₁₅₅₇₇ ₁_1..5₅ ₂_2..5₅₁₁ _0..9₀ ₉₅₅ ₁_1..4₄₂₂₅_5m_mx_x6_6m_m

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Major Dimensions specified: Major Dimensions specified:

1.

1. OvOvereralall ll lenengtgthh 2.

2. CoCoururse se llenengtgthh 3.

3. cicircrcumfumfererencence e llenengthgth 4.

4. oriorienentatatition on ananglglee 5.

5. bebetwetween en ananglegles ls lenengthgth 6.

6. weld weld to welto weld disd distance tance (longi(longitudinal tudinal and and circumfecircumference) lrence) lengthength 7.

7. welweld Gap d Gap (lon(longitugitudinal dinal and ciand circumrcumferferenceence)) 8.

8. NozzNozzle le posipositions tions anangles gles and and disdistanctancee 9.

9. AttacAttachmhments anents and all typd all types of clies of clips posips positiontions and angs and angleless 10.

10. welding detailwelding details should be maintain weld sizes, welding angless should be maintain weld sizes, welding angles, which t, which type of weld shouldype of weld should be used

be used 11.

11. part no. in all plates, curb angle, all attachmpart no. in all plates, curb angle, all attachment clips with out nozzlent clips with out nozzle and nozzle padse and nozzle pads 12.

12. If any legenIf any legends there these ids there these items also incltems also includeude

BOTTOM PLATE DEVELOPMENT BOTTOM PLATE DEVELOPMENT Bottom Plates

Bottom Plates

Single-welded full-fillet lap joint or single-welded butt joint with backing strip. Single-welded full-fillet lap joint or single-welded butt joint with backing strip. The bottom plates shall project at least 1inch width beyond the outside edge of the weld The bottom plates shall project at least 1inch width beyond the outside edge of the weld attaching the bottom to shell plate

attaching the bottom to shell plate 1.

1. BotBottom tom plate plate devdevelopmelopment ent drawdrawiningg 2.

3. plplate tate to plo plate wate weleldinding deg detaitaill 4.

4. thrthree ee plplate ate welweldinding dg detaietaill 5.

5. BotBottom pltom plate to Anate to Annunular pllar plate anate and Back sd Back strip wtrip weldinelding detaig detaill 6.

6. SecSection tion ViewViews for ps for plate tlate to plao plate welte welding dding detailetailss 7.

8. GGeenneerral Nal Nootetess

DESIGN OF BOTTOM PLATE: DESIGN OF BOTTOM PLATE:

(CL 3.4.1 of API-650) and BS 2654 (CL 3.4.1 of API-650) and BS 2654

Bottom plate thickn

Bottom plate thickness = ess = 6mm + C.A6mm + C.A Min plate thickness for

Min plate thickness for Stainless steel tanksStainless steel tanks

Lap welded bottom plate = 5tmm Lap welded bottom plate = 5tmm But wel

But welded bottom ded bottom plate plate = 3m= 3mmm Min plate thickness for

Min plate thickness for Carbon steel tanksCarbon steel tanks

Lap welded bottom plate = 6mm Lap welded bottom plate = 6mm But wel

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DESIGN OF ANNULAR PLATE: DESIGN OF ANNULAR PLATE:

(CL 3.5.3 & Table 3.1 of API-6500) (CL 3.5.3 & Table 3.1 of API-6500)

Hydrostatic Stress Hydrostatic Stress 4.9 4.9 x x D D x x H

 

H - - 0.30.3



THK THK   (example) (example)

 



4. 4.9x 9x 3636.0.01212x x 1111.7.71919 0.0.33 12 12    

= 167.92 < 210 (210 is material allowable stress in design temperature) = 167.92 < 210 (210 is material allowable stress in design temperature) Hydrostatic Stress < 210 Mpa

Hydrostatic Stress < 210 Mpa

Annular Plate Thickness provided = 12mm Annular Plate Thickness provided = 12mm

Annular plate width Annular plate width

(CL 3.5.2 of API-650) (CL 3.5.2 of API-650) Annul

Annular plate radiar plate radial width al width = 215= 215

tt

_b_b / (HG) / (HG)0.50.5

Min radial width will be maintain 600 mm as per Cl 3.5.2 Min radial width will be maintain 600 mm as per Cl 3.5.2

tt

b = b = ThicThickness of the kness of the annular plate annular plate in mmin mm

H = Maximum design liquid level H = Maximum design liquid level

G = Design specific gravity of the liquid to be stored G = Design specific gravity of the liquid to be stored

1.

1. OvOvereralall dl devevelelopeoped ODd OD 2.

2. plplate ate cocoururse se wiwidtdthh 3.

3. wweleldiding ng ggaapp 4.

4. Center of Center of Bottom Bottom plaplate to middlte to middle plate fie plate fixing dimxing dimensiensions(verticons(vertical & horizal & horizontal)ontal) 5.

5. BBotottotom plm plaate slte slopopee 6.

6. TypType of we of weldeld, wel, welding ding size size anand weld welding ding anglanglee 7.

7. plaplate edge prte edge prepaeparatiration dimon dimensiensions in welons in welding dding detailetail 8.

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ROOF PLATE DEVELOPMENT ROOF PLATE DEVELOPMENT Roof Plates

Roof Plates

Single-welded full-fillet lap joint. Roof plates shall be welded to the top angle Single-welded full-fillet lap joint. Roof plates shall be welded to the top angle of

of the the tank tank with with continuous continuous fillet fillet weld weld on on the the top top side side only.only. 1.

1. RoRoof plof platate deve develelopmopmenent drawit drawinngg 2.

3. plplate tate to plo plate wate weleldinding deg detaitaill 4.

4. SecSection tion ViewViews for ps for plate tlate to plao plate welte welding dding detailetailss 5.

6. GGeenneerral Nal Nootetess 7.

7. CrCrown pown plalate tte to Roo Roof plof plate date detaetailil

Types of Roofs Types of Roofs

1. Fixed Roof 1. Fixed Roof

1.

1. Cone Cone Roof Roof 2.

2. Doom Doom Roof Roof 3.

3. Umbrella Umbrella Roof Roof 2. External floating roofs 2. External floating roofs

1.

1. TypeTypes of s of external floating roof external floating roof 1. Single-deck pontoon type 1. Single-deck pontoon type 2. Double-deck type

2. Double-deck type 2 Other types of floating roof 2 Other types of floating roof

1. BIPM roof 1. BIPM roof 2. Buoy roof 2. Buoy roof 3 Internal floating roofs 3 Internal floating roofs

1. Types of internal floating roofs 1. Types of internal floating roofs

1. Pan roof 1. Pan roof 2.

2. HoneyHoneycomb roof comb roof 3. Pontoon and skin roof 3. Pontoon and skin roof

DESIGN OF ROOF PLATE: DESIGN OF ROOF PLATE: For CONE For CONE t = D/400 sin t = D/400 sin   t = t = ½ in (Max)½ in (Max) 

_{= 37}_{= 37 deg (9:12 slope)}_{deg (9:12 slope)} 

_{= 9.28 deg (2:12 slipe)}_{= 9.28 deg (2:12 slipe)}

Fro DOOM Fro DOOM

t = R/200 but not lesser than 3/16 in t = R/200 but not lesser than 3/16 in t = ½ in t = ½ in R = 0.8 D (min) R = 0.8 D (min) R = 1.2D (max) R = 1.2D (max)

Unless otherwise specified by the purchaser Unless otherwise specified by the purchaser

(Cl

(Cl 3.10.2.2 3.10.2.2 of of API-65API-650 0 )) Minimum Thi

Minimum Thickness of Roof Plate = ckness of Roof Plate = 5mm + C.A5mm + C.A Considering the Bottom Plate Thickness as 6mm. Considering the Bottom Plate Thickness as 6mm. Roof plate Thickness provided min = 5mm

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1.

1. OveralOverall developed ODl developed OD 2.

2. Plate Plate course wcourse widthidth 3. Welding gap

3. Welding gap

4. Center of Roof plate to middle plate fixing dimensions (vertical & horizontal) 4. Center of Roof plate to middle plate fixing dimensions (vertical & horizontal) 5. Roof plate slope

5. Roof plate slope

6. Type of weld, welding size and welding angle 6. Type of weld, welding size and welding angle 7. Plate edge preparation dimensions in welding detail 7. Plate edge preparation dimensions in welding detail

8. Roof Nozzles, RF pads, Roof man ways, positions and angles 8. Roof Nozzles, RF pads, Roof man ways, positions and angles 9. Roof cutting angle

9. Roof cutting angle

10. Crown plate cutting angle. 10. Crown plate cutting angle.

CUTTING

CUTTING ANGLE ANGLE CALCULATIONCALCULATION : :

(R / r * 360) - 360

NOZZLE DETAILING NOZZLE DETAILING

1.

1. NozNozzlzle ane and Man d Man way way welweld ded detaitaillss 2.

2. NozzlNozzle desie design as gn as per Cper CL 3.7 iL 3.7 in An API 650 PI 650 follfollowow

Reinforce nozzle welding detail

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DETAIL OF LONG WELD NECK NOZZLE &

DETAIL OF LONG WELD NECK NOZZLE & NOZZLE WITH RF PADNOZZLE WITH RF PAD

Lesser than

Lesser than 3” and 3” and 250 and 250 and above lg above lg provide provide Stiffener plate 2 nStiffener plate 2 no aparto apart 90 deg

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Manways Manways

The number of manways to be provided are shown in the table below: The number of manways to be provided are shown in the table below:

TANK TANK NOMINAL NOMINAL DIA. (FT) DIA. (FT) MANWAYS MANWAYS IN SHELL IN SHELL MANWAYS MANWAYS FIXED ROOF FIXED ROOF IN ROOF IN ROOF FLOATING ROOF FLOATING ROOF DECK DECK U

Up p tto o 2200 1 1 - - 224 4 iinncchh 1 - 1 - 224 4 iinncchh 1 1 - - 330 0 iinncchh o

ovveer r 220 0 tto o 6600 2 2 - - 224 4 iinncchh 1 1 - - 224 4 iinncchh 1 1 - - 330 0 iinncchh o

ovveer r 660 0 tto o 112200 3 3 - - 224 4 iinncchh 1 1 - - 224 4 iinncchh 2 2 - - 330 0 iinncchh o ovveer r 112200 2 2 - - 224 4 iinncchh 1 - 30 inch 1 - 30 inch 2 2 - - 224 4 iinncchh 2 2 - - 330 0 iinncchh Floating roofs Floating roofs Types Types

1. Metallic pan roofs: 1. Metallic pan roofs:

These are in contact with the liquid and have peripheral rim These are in contact with the liquid and have peripheral rim 2. Metallic bulkhead roofs:

2. Metallic bulkhead roofs:

These are in contact with the liquid and have open – top bulkheads. These are in contact with the liquid and have open – top bulkheads. 3. Metallic pontoon roofs

3. Metallic pontoon roofs

These are in contact with the liquid and have closed pontoons These are in contact with the liquid and have closed pontoons 4. Metallic double - deck roofs:

4. Metallic double - deck roofs:

These are in contact with the liquid These are in contact with the liquid 5. Metallic roof on floats:

5. Metallic roof on floats:

These roofs have their deck above the liquid. These roofs have their deck above the liquid. 6. Metallic sandwich – panel

6. Metallic sandwich – panel roofs:roofs:

These have surface – coated honeycomb panels and are in contact with the These have surface – coated honeycomb panels and are in contact with the liquid

liquid 7. Plastic sandwich – pan

7. Plastic sandwich – panel roofs:el roofs:

These are surface coated rigid panels and are in contact with the liquid These are surface coated rigid panels and are in contact with the liquid 8.

8.Roof seals design shall:Roof seals design shall:

1. Be sufficiently flexible and have sufficient range of movement to 1. Be sufficiently flexible and have sufficient range of movement to accommodate roof movements and flexing of the roof and tank wall.

accommodate roof movements and flexing of the roof and tank wall. 2. Remain stable in sunlight, tank liquid, tank vapour etc.

2. Remain stable in sunlight, tank liquid, tank vapour etc.

3. Prevent contact between organic materials and the tank contents. 3. Prevent contact between organic materials and the tank contents. 4. Have metallic components galvanised unless otherwise agreed. 4. Have metallic components galvanised unless otherwise agreed. 5. Ensure contact be

5. Ensure contact between seal and shell atween seal and shell above liquid levelbove liquid level. . Shoe type seShoe type seals toals to have 90% minimum contac

have 90% minimum contact and flexible seal typt and flexible seal type 100% minimum contact. e 100% minimum contact. NoNo gap shall exceed 0.25 inch or be

gap shall exceed 0.25 inch or be circumcircumferentially longer than 48 inches.ferentially longer than 48 inches. 6. Include primary and

6. Include primary and secondsecondary seals unless ary seals unless otherwise agreed.otherwise agreed. 7. Include rim seal vents.

7. Include rim seal vents. 8. Sleeves for leg

8. Sleeves for leg supports shall remain above liquid level when the deck supports shall remain above liquid level when the deck is fullyis fully deflected.

deflected.

9. Internal floating roofs shall comply with API 650 Appendix H except that 9. Internal floating roofs shall comply with API 650 Appendix H except that minimum thickness

minimum thickness shall be shall be 6mm 6mm for aluminium for aluminium and stainless steel. and stainless steel. Pan Pan typetype floating roofs shall not be used. Fixed internal ladders are not permitted.

(15)

Tank Height to Dia ratio by

Tank Height to Dia ratio by Sesmic ZoneSesmic Zone

S

Seessmmiic c ZZoonnee MMaax x ttaannk k hheeiigghht t ((HHeeiigghht t tto o DDiia a rraattiioo))

1 1 22..44::11 2 2 11..2255::11 3 3 00..6677::11 4

4 00..55::1 1 ((SSmmaalll l ttaannkk, , ssoofft t ssooiill)) 4

4 00..66::1 1 ((llaarrgge e ttaannkk, , ffiirrm m ssooiill))

Rectangular Tanks

Ratio of sides Ratio of sides

The sides are equal The sides are equal

B = 3 root of V B = 3 root of V V = Volume V = Volume If Rectangular If Rectangular Length = 1.5 B Length = 1.5 B Width = 0.667 B Width = 0.667 B

Welding for corer plates (welding size –

(16)

Materials selection Materials selection

N

Noomiminanal l ccoommppososiititioon n CCrrititeerriaia C

C – – SStteeeell PPllaaiin n CCaarrbboon n sstteeeell C

C – – SSi i SStteeeell EExxcceeeed d 00..11%%SSiilliiccoonn C

C – – MMn n SStteeeell EExxcceeeed d 11..00%%MMaannggnneessee C

C – – MMo o SStteeeell CCaarrbboon n wwiitth h m om ollyybbddeennuum m aaddddeed d aat t tthhe e mmi di dppooiinnt t oof f tthhee Range specified

Range specified C – Mn – Si Steel

C – Mn – Si Steel I.

I. Selection Selection of of Materials Materials for for Service Service EnvironmentEnvironment 1.

1. Design Design FactorsFactors Design factors to

Design factors to consider include:consider include:

• Operating temperature and pressure • Operating temperature and pressure • Service environment • Service environment • Cost • Cost • Design life • Design life

• Reliability and safety • Reliability and safety 2.

2. Typical Typical selectionsselections 3.

3. Application Criteria for Common Pressure Vessels MaterialsApplication Criteria for Common Pressure Vessels Materials 4.

4. Summary of Temperature LimitationsSummary of Temperature Limitations II.

II. Selection Selection of of MaterialMaterials for s for Brittle Brittle Fracture Fracture PreventionPrevention 1.

1. Definition of Brittle FractureDefinition of Brittle Fracture 2.

2. Design to Prevent Brittle FractureDesign to Prevent Brittle Fracture 3.

3. Recommended PracRecommended Practice ftice for Selecor Selecting ting Steels Steels for Nfor New Coew Constructionstruction on of Pressure f Pressure VesselsVessels 4.

4. Typical Carbon Steel Selections to Avoid Brittle Fracture in Pressure Typical Carbon Steel Selections to Avoid Brittle Fracture in Pressure VesselsVessels 5.

5. Steel Selection for Pressure Vessels Subject to Auto refrigerationSteel Selection for Pressure Vessels Subject to Auto refrigeration 6.

6. Factors Factors ControControlling Slling S usceptusceptibility to ibility to Brittle FBrittle F racture: Additionaracture: Additional l TecTechnical hnical InfoInformationrmation III.

III. Material SeMaterial Selections lections idias idias and and constructionconstruction 1.

1. DetermineDetermine Minimum desigMinimum design metal temperature” (MDMT).n metal temperature” (MDMT). 2.

2. DetermDetermineine MiMinimnimum pum presressusurinring temg tempeperatratureure” (MP” (MPT)T) 3.

3. Maximum allowablMaximum allowable stress ve stress values shalalues shall be in l be in accoaccordance with rdance with the API the API Standard, sectStandard, section 3.6.2 ion 3.6.2 Table 3Table 3.2..2. 4.

4. For austenitic stainFor austenitic stainless steel less steel tanks the tanks the allowablallowable stress shae stress shall be tll be to the o the rules of rules of API 620 API 620 AppendAppendix Qix Q 5.

5. Annular bottom plates Annular bottom plates shall be shall be to the sato the same material specification and me material specification and grade as grade as the bottom shethe bottom shellll course.

course. 6.

6. Cast fittinCast fittings shags shall noll not be ut be used in sed in the shthe shell oell or botr bottom otom of the taf the tank nk 7.

7. For stainless steeFor stainless steel tanks l tanks to API to API rules, the rules, the material specifications and material specifications and allowable stress allowable stress rules of Arules of API 620PI 620 Appendix Q shall be used.

Appendix Q shall be used. 8.

8. Corrosion allowance shall Corrosion allowance shall be added be added to the to the minimum annular plate thicknesses minimum annular plate thicknesses of API of API 650 Table 650 Table 3-1.3-1. 9.

9. Minimum thicknesses Minimum thicknesses of internal of internal structural members structural members shall be shall be 6mm plus 6mm plus corrosion allowance.corrosion allowance. 10.

10. Wind girders on floating roof tanks shall be 3 Wind girders on floating roof tanks shall be 3 feet 6 inches below the feet 6 inches below the top of the curb angle and shalltop of the curb angle and shall have a minimum width of 18

have a minimum width of 18 inches outside the curb angle. inches outside the curb angle. If used as a If used as a walkway the girder shallwalkway the girder shall comply with API 650 paragraph 3.9.4.

comply with API 650 paragraph 3.9.4. 11.

11. For stainless steel tanks the wind girder section modules of API 650 shall be multiplied by 21000/S,For stainless steel tanks the wind girder section modules of API 650 shall be multiplied by 21000/S, where S is the stainless steel design stress (psi).

where S is the stainless steel design stress (psi). 12.

12. Fixed roof API 650 tanks shall have Fixed roof API 650 tanks shall have a frangible joint between the top anga frangible joint between the top angle and the roof plates.le and the roof plates.

13. For fixed roof pressurised design to API 650 Appendix F the area formula in F.5. shall also be 13. For fixed roof pressurised design to API 650 Appendix F the area formula in F.5. shall also be

multiplied by 24000/S, for stainless steel design. multiplied by 24000/S, for stainless steel design. 14.

14. For Floting roof Bearing plates 0.375 inches thick shall be pFor Floting roof Bearing plates 0.375 inches thick shall be provided under each support leg.rovided under each support leg. 15.

15. For Floting roof For Floting roof Thickness of Thickness of the outer rim the outer rim shall be shall be 0.25 inches 0.25 inches plus corrosion allowance plus corrosion allowance minimum.minimum. 16.

16. Roof decks shall be continuously welded from the top sRoof decks shall be continuously welded from the top side and pontoon bulkheads shall be ide and pontoon bulkheads shall be welded atwelded at the top to be vapour tight.

(17)

17.

17. A continuous foam daA continuous foam dam shall be provided on m shall be provided on tanks 100 tanks 100 feet diameter and over. feet diameter and over. The dam shaThe dam shall be ofll be of 0.187 inch plate and shall be to NFPA No. 11 Appendix A-3.2.11.1.

0.187 inch plate and shall be to NFPA No. 11 Appendix A-3.2.11.1. Information to be specified by the purchaser

Information to be specified by the purchaser 1

1 The following The following basic information basic information to be to be specified byspecified bythe purchasethe purchaser shall r shall be be fully documented. fully documented. BothBoth the definitive requirements specified throughout the Standard and the documented items shall be the definitive requirements specified throughout the Standard and the documented items shall be satisfied before a claim of comoliance with the Standard can be made and verified.

satisfied before a claim of comoliance with the Standard can be made and verified. 2

2 (a) (a) Geographical Geographical location location of of the the tank.tank. 3

3 (b) Diameter and (b) Diameter and height or height or the capacity the capacity of the of the tank, including tank, including ullage. Where ullage. Where only the only the capacity ofcapacity of the tank is

the tank is specifiespecifiedd 4

4 Ground Ground conditions conditions shall shall be be included.included. 5

5 (c) Whether fixe(c) Whether fixed or d or floating roof floating roof into be into be supplied and supplied and the type the type of roof of roof if the if the purchaser has purchaser has specificspecific preferences, i.e. for Fixed roofs (cone, dome, membrane, etc.) or floating roofs (pontoon, double preferences, i.e. for Fixed roofs (cone, dome, membrane, etc.) or floating roofs (pontoon, double deck, etc.).

deck, etc.).

6

6 (d) All (d) All relevant prelevant properties of roperties of the conthe contained fluid, tained fluid, including the including the relative density relative density and and corrosioncorrosion allowance (if, how and Where required).

allowance (if, how and Where required). 7

7 (e) The (e) The design design vapor vapor pressure pressure and and vacuum vacuum conditions conditions inside inside the the tanktank 8

8 (f) The (f) The minimum minimum and and maximum maximum design design metal metal temperaturestemperatures 9

9 (g) The (g) The size, nusize, number and mber and type type of aof all mountings ll mountings required showing required showing locations. Maximum locations. Maximum filling andfilling and emptying rates And any special venting arrangement

emptying rates And any special venting arrangement 10

10 (h) The minimum de(h) The minimum depth of pth of product which product which is always pis always present in resent in the tankthe tank 11

11 (i) lf (i) lf the tank the tank is to is to be be thermally insulatedthermally insulated 12

12 0) Areas of 0) Areas of responsibilitresponsibility betweey between the den the designer, the manufacturer and signer, the manufacturer and the erector ofthe the erector ofthe tank whentank when these are not the same.

these are not the same.

13

13 (k) Quality of(k) Quality ofthe wathe water to be useter to be used during tad during tank watenk water testr test 14

14 (l) Expecte(l) Expected maximum diffed maximum differential settrential settlements durlements during wateing water testing and ser testing and service lifetime of the rvice lifetime of the tanktank (see AppendixA).

(see AppendixA). 15

15 (m) Other specifications which (m) Other specifications which are to be are to be read in conjunction read in conjunction with this Swith this Standard.tandard.

For Refernece For Refernece

1.

1. Guide to Guide to storage tanks storage tanks and eand equipment design quipment design by: Bob by: Bob Long aLong and Bob nd Bob GarnerGarner 2.

2. API API 650 650 StandardStandard

Prepared by Prepared by I.ROBERT