Ship, Barge, and Terminal Hydrocarbon Vapor Collection Manifolds API RECOMMENDED PRACTICE 1124 FIRST EDITION, MARCH 1991 American Petroleum Institute 1220 L Street, Northwest Washington, D C 20005 11)[.]
Ship, Barge, and Terminal Hydrocarbon Vapor Collection Manifolds API RECOMMENDED PRACTICE 1124 FIRST EDITION, MARCH 1991 Copyright by the American Petroleum Institute Thu May 11 16:43:22 2006 American Petroleum Institute 1220 L Street, Northwest Washington, D.C 20005 11) Ship, Barge, and Terminal Hydrocarbon Vapor Collection Manifolds Transportation Department API RECOMMENDED PRACTICE 1124 FIRST EDITION, MARCH 1991 American Petroleum Institute Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 API RP*LL24 71 0732290 0076035 M SPECIAL NOTES API PUBLICATIONS NECESSARILY ADDRESS PROBLEMS OF A GENERAL NATURE WITH RESPECT TO PARTICULAR CIRCUMSTANCES, LOCAL, STATE, AND FEDERAL LAWS AND REGULATIONS SHOULD BE REVIEWED API IS NOT UNDERTAKING TO MEET THE DUTIES OF EMPLOYERS, MANUFACTURERS, OR SUPPLIERS TO WARN OR PROPERLY TRAIN AND EQUIP THEIR EMPLOYEES, AND OTHERS EXPOSED, CONCERNING HEALTH AND SAFETY RISKS AND PRECAUTIONS, NOR UNDERTAKING THEIR OBLIGATIONS UNDER LOCAL, 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BE ASCERTAINED FROM THE API AUTHORING DEPARTMENT [TELEPHONE (202) 682-8000] A CATALOG OF API PUBLICATIONS AND MATERIALS IS PUBLISHED ANNUALLY AND UPDATED QUARTERLY BY API, 1220 L STREET, N.W., WASHINGTON, DC 20005 Copyright 1991 American Petroleum Institute Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 FOREWORD This recommended practice was developed under the direction of the API Marine Transportation Committee The publication is intended to introduce uniformity in vapor manifold arrangements for tank ships, tank barges, and marine terminals required to installation vapor collection systems for the transfer of cargo vapors API publications may be used by anyone desiring to so Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with the publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict Suggested revisions are invited and should be submitted to the director of the Transportation Department, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C 20005 Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 CONTENTS SECTION 1-GENERAL 1.1 1.2 1.3 1.4 Introduction Background Scope Referenced Publications SECTION 2-TmK SHIP VAPOR MANIFOLD RECOMMENDED PRACTICES 2.1 Ship Tonnage Categories 2.2 Manifold Position 2.2.1 Distance From Ship's Side 2.2.2 Height of Vapor Manifold 2.2.3 Spacing 2.2.4 Number and Position 2.2.5 Labeling .' 2.3 Spill Tank and Working Platform 2.3.1 Spill Tank and Working Platform Details 2.3.2 Combined Working Platforms and Spill Tanks 2.4 Vapor Manifold: General 2.4.1 Material 2.4.2 Strength 2.5 Vapor Manifold Specifications and Fittings 2.5.1 Valves 2.5.2 Distance Pieces 2.5.3 Reducers/Expanders 2.5.4 Blank Flanges 1 1 1 4 4 4 4 8 8 8 9 10 SECTION S T A N K BARGE VAPOR MANIFOLD RECOMMENDED PRACTICES 11 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Barge Tonnage Categories Manifold Position Labeling Drip Pans Material Valves Flanges Blank Ranges SECTION 4-TERMINAL VAPOR MANIFOLD RECOMMENDED PRACTICES 4.1 Manifold Position 4.2 Labeling 4.2.1 Vapor Hoses 4.2.2 Vapor Collection Arms 4.3 Flanges 4.3.1 Vapor Hoses 4.3.2 Vapor Collection Arms 4.4 Protection Against Arcing During Connection/Disconnection 4.5 Reducersffixpanders Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 11 11 11 12 12 12 12 13 13 13 13 13 13 13 13 14 14 14 API RP*ll24 71 0732270 0076038 Figures 1-Category A Manifold 2-Category B Manifold 3-Category C Manifold 4-Category D Manifold 5-Labeling 6-Presentation Flange Orientation 10 7-Barge Manifold (up to 10.000 DWT) 11 &Barge Manifold (above 10.000 DWT) 12 Tables 1-Vapor Manifold Spacing 2-Loads at Tank Ship Presentation Flange 3-Tank Ship Vapor ReducersIExpanders 4-Barge Presentation Flange Sizes Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 12 A P I RP*LL24 '71 0732270 009b039 b Ship, Barge, and Terminal Hydrocarbon Vapor Collection Manifolds SECTION 1-GENERAL be difficult or impossible due to space limitations In such cases for alternate ;apor line locations are included in2,2.3.2 for tank ships and 3.2.1 through 3.2.3 for tank barges, 1.I Introduction - - - - - - - - 1.I.I This recommended practice is intended to introduce uniformity in vapor manifold arrangements for all tank ships, tank barges, and marine terminals required to install vapor collection systems for the transfer of cargo vapors ashore or between vessels while loading or while ballasting in previously loaded cargo tanks recommended 1.3.3 This practice is patterned after, and should be used in conjunction with, the Oil panies' International Marine Forum (OCIMF), Standards for Oil Tanker Manifolds and ~ssociatedEquipThird Edition, 1988 1.I.2 The recommendations in this publication are offered as references and are not necessarily intended to be mandatory However, in cases where deviations from these recommendations exist, it is incumbent on the contracting parties to notify each other and provide assurance in advance of cargo operations so that proper vapor manifold connections can be made 1.3.4 Specialized tank ships and barges, particularly those employed in chemical and specialty product trades, may require special manifold arrangements Those arrangements are not addressed in this recommended practice 1.2 Background 1.3.5 This recommended practice does not cover necessary safeguards to prevent or control releases, fire, or explosion in vapor control systems In 1989, an API-sponsored hazard analysis concluded that overall safety would be enhanced if means were provided to prevent misconnection between liquid and vapor collection piping This recommended practice is intended to provide safeguards against misconnection, as well as promote a degree of standardization in manifold arrangements 1.4 Referenced Publications The following documents are referenced in this recommended practice: American National Standards Institute B16.5 Pipe Flanges and Flanged Fittings (ANSU AS^ B G ~ ) B31.3 Chemical Plant and Petroleum Refinery Piping ( A N S W M E B31.3) 1.3 Scope 1.3.1 The recommendations in this document supplement U.S Coast Guard regulations concerning marine vapor control systems, contained in Title 33, Code of Federal Regulations, Parts 154-156 and Title 46, Code of Federal Regulations, Parts 30, 32, 35, and 39 Code of Federal Regulations (CFR) Title 33 CFR Parts 154-156 Title 46 CFR Parts 30, 32, 35, and 39 1.3.2 This recommended practice is intended for use foi all vessels and terminals required to install vapor collection systems The recommendations cover all vessel and barge size categories; however, it is recognized that the application of the proposed piping arrangements and manifold spacings aboard existing vessels may SECTION 2-TANK 2.1 Oil Companies International Marine Forum Standards for Oil Tanker Manifolds and Associated Equipment, Third Edition, 1988 International Safety Guidefor Oil Tankers and Terminals SHIP VAPOR MANIFOLD STANDARDS Ship Tonnage Categories (Approximate) A 16,000to 25,000 Summer DWT (metric tons) (see Figure 1) B 25,001 to 60,000 Summer DWT (metric tons) (see Figure 2) This section applies to the following categories of ships: Copyright by the American Petroleum Institute Thu May 11 16:43:36 2006 A P I RP*LL24 91 m 0732270 0076040 m API RECOMMENDED PRACTICE 1124 I CARGO LINE CARGO LINE BUNKER LINE VAPOR LINE 5z MANIFOLD Figure 1-Gategory A Manifold: Standard Manifold Arrangement for 16,000 to 25,000 Summer DWT (metric tons) Tank Ship Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 API RP*L124 91 0732270 0076042 b M API RECOMMENDED PRACTICE 1124 C 60,001 to 160,000 Summer DWT (metric tons) (see Figure 3) D Vessels over 160,000 Summer DWT (metric tons) (see Figure 4) 2.2 Manifold Position 2.2.1 DISTANCE FROM SHIP'S SIDE Vapor manifold presentation flanges should be parallel toand in line with the liquid presentation flanges, 4.6 meters (15.09 feet) inboard from the ship's sides 2.2.2 HEIGHT OF VAPOR MANIFOLD 2.2.2.1 The centers of the manifold presentation flanges should be located at least 700 millimeters (2.30 feet) above the horizontal projection of the top of the hose support at ship's side 2.2.2.2 Except as specifically provided for in 2.2.3.2, the presentation flanges the height of the centers above the deck should not exceed 2.1 meters (6.89 feet) 2.2.2.3 The working platform should be fitted to allow 900 millimeters (2.95 feet) between the level of the platform and the centers of the presentation flanges 2.2.3 SPACING 2.2.3.1 The spacing of the vapor manifolds as measured center to center from the bunker lines along the line of presentation flanges should be in accordance with Table i 2.2.3.2.2 The vapor manifolds may be located directly above the centerlines of the existing bunker lines, a configuration commonly called "piggy-backed." If an existing working platform is to be used with a piggybacked vapor line, the height of the center of the vapor line's presentation flange above the working platform should not exceed 1.5 meters (4.92 feet) 2.2.4 NUMBER AND POSITION Four vapor connections should be provided, two on each side of the ship, with presentation flanges at the same height above the deck as the cargo manifold One vapor connection should be located forward of the manifold and one located aft of the manifold on each side of the ship 2.2.5 LABELING The first 1.0meters (3.28 feet) inboard of each vapor manifold connection should be painted on its exterior surfaces excludingflange faces The painted area should be divided into three bands, with the outboard and inboard bands being red in color and 100 millimeters (4 inches) wide and the center band being yellow in wlor In addition, the word 66VApoR,,should be painted in black letters at least 50 millimeters (2 inches) high on both the forward and after sides df all reduce~slexpanders (both principal and reserve) in approximately the two o'clock and ten o'clock positions See Figure for illustration 2.3 Spill Tank and Working Platform 2.2.3.2 For retrofit installations aboard vessels where significant interferences (for example, winches, hose handling gear, deck houses, etc.) prevent the location of the vapor manifolds in accordance with Table 1, the alternate vapor line locations noted in 2.2.3.2.1 and 2.2.3.2.2 may be considered All ships should be provided with permanently fitted spill tanks and working platforms under the vapor manifold connections 2.2.3.2.1 The vapor manifolds may be located fore and aft of the bunker lines at some lesser distance than that prescribed by Table The distance from the bunker lines, however, should not be less than 1.0 meters (3.28 feet) 2.3.1.1 Table 1-Vapor Manifold Spacing Ship Tonnage Category Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 Vapor Manifold Spacing Center to Center meters feet 2.3.1 SPILL TANK AND WORKING PLATFORM DETAILS Size and Position Length: The spill tank and the working platform should extend beyond the vapor connections at the forward and after ends of the manifold Width: The spill tank and working platform should have a width of approximately 1.8 meters (5.90 feet) and should be so positioned that about 1.2 meters (3.94 feet) is outboard of the reducerlexpander presentation flanges Depth: The spill tanks should have a minimum depth of about 300 millimeters (11.81 inches) Vertical positioning: The working platform should be situated 900 millimeters (2.95 feet) below the level of the centers of the reducerlexpander presentation flanges Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 A P I RP*LL24 71 0732290 007b044 T API RECOMMENDED PRACTICE 1124 I CARGO LINE CARGO LINE BUNKER LINE VAPOR LINE 2.1 M (max.) sz MANIFOLD Figure G a t e g o r y D Manifold: Standard Manifold Arrangement for Tank Ships Over Summer 160,000 DWT (metric tons) Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 STENCIL I Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 API RPMLL2q 91 API RECOMMENDED PRACTICE 124 and the spill tank should be located below the working platform 2.3.1.2 Spill Tank Capacity The capacity of the spill tank should comply with 33 CFR 155.310 2.3.1.3 Spill Tank Draining Suitable means of draining the spill tank should be provided Consideration should be given to the particuiar type of tank ship, trading, and Eargos which can be encountered 2.3.2 COMBINED WORKING PLATFORMS AND SPILL TANKS Where the working platform and spill tank have been designed as combined units, the dimensions and strength of each should not differ from those outlined in 2.3.1.1 and 2.3.1.3 In addition, all of the other provisions of 2.3.1 should be followed as closely as possible, including the requirement for hose protection on leading edges Vapor ~ ~ ~ i fGeneral ~ l d : 2.4 2.4.1 2.3.1.4 Strength of Working Platform The strength and construction of the working platform and supports should be such that all normal loads encountered during hose connection, vapor handling, and disconnection can be adequately accommodated The grid forming the working surface should be capable of withstanding a load of at least 1.0 metric tons per square meter (1-42psi) 2.3.1.5 rn 0732270 0076046 Design of Work Platform MATERIAL The whole vapor manifold, including the manifold support, should be of steel and should conform to the requirements of ANSI B31.3 (1987 edition) All vapor piping should be electrically continuous and bonded to the vessel's hull 2.4.2 STRENGTH The vapor manifold supports, distance pieces, and reducerslexpanders should be capable of withstanding the loads at the presentation flanges (presentationflange is defined in 2.5.3.1) as outlined in Table The working platform surface is to be made from open mesh grating to allow free passage of any condensate spilled from the manifold to the spill tank The grid should have a non-slip surface and should be removable, in easily handled sections, allowing access to the spill tank below The outboard uppermost edge of the working platfondspill tank complex should be fitted with a 50 millimeter (2.0 inches) radius rounded edge to protect vapor hoses during connection and disconnection The vapor manifold valves should be made of steel and fitted with flanges conforming to ANSI B16.5 2.3.1.6 2.5.1.2 Access to Working Platform A steel stairway of suitable size should be provided at the forward and aftermost ends of the platform leading to the deck Table 2-Loads 2.5 Vapor Manifold Specifications and Fittings 2.5.1 2.5.1.1 VALVES Material Valve Actuator Vapor manifold valve actuators, when fitted, should be placed on the inboard side of the valve to avoid damage and overcrowding during hose handling at Tank Ship Presentation Flanges Shiv Tonnage Categow Load Vertical force (metric tons) Lateral force (metric tons) Axial force (metric tons) Moment (metric ton-meters) Force based on maximum loads imposed by unsupported loading arms of stated size ( d i n c h e s ) Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 A 5 B C&D 10 10 15 10 406.4116 508.0120 609.6124 A P I R P * L L M 0732290 009bOLI7 M SHIP,BARGE, AND TERMINAL HYDROCAABON VAPOR COLLECTION MANIFOLDS 2.5.2 2.5.2.1 DISTANCE PIECES 2.5.3.4 Presentation Flanges Material Steel distance pieces with outboard flanges conforming to ANSI B16.5 should be fitted outboard of the inboard Of the reand conform ducerslex~anders'The inboard to ANSI B16.5 2.5.2.2 Length The length of the distance pieces should be kept to a minimum However, the length of the distance pieces should be adequate to provide sufficient room: To ensure that sufficient space is available for bolt withdrawal from the valveldistance piece and distance ~iece/reducer/ex~ander flanges A minimum of 200 millimeters (7.87 inches) should be allowed for this purpose on each flange To allow affixing to the manifold support TOfit drain line connections which may be required Such lines, when incorporated, should be fitted inboard of the manifold supports 2.5.3 2.5.3.1 Material Length reducers/expanders should have an overall length of 500 millimeters (1.64 feet) 2.5.3.3 The number of reducerslexpanders and the size of presentation flanges for the various tonnage categories should be in accordance with Table Under normal circumstances, the principal vapor reducerslexpanders should be kept bolted to the distance pieces; and no more than one reducer/expander is permitted outboard of the distance piece for each manifold 2.5.3.5 Material and Design AU presentation flanges should conform to ANSI B16.5 They should be kept vertical and should have plain (flat) faces (that is, raised faced flanges should not be used) A hazards analysis of vapor control operations has indicated that the cross-connection of vapor and cargo systems significantlyincreases the probability of fire or explosion when loading cargo with vapor control In order to prevent the possible misconnection of thevapor manifold to a liquid loading line a lugged keying is, for thevapor presentation flanges is recommended Details on the lugged keying mechanism are as follows: The bolt locations should be arranged so that two bolts straddle the twelve o'clock position at the top of the flange face REDUCERSIEXPANDERS All reducerslexpanders should be made of steel The inboard flangeshould conform to ANSI B16.5 and be made to bolt directly to the distance piece (see 2.5.2) The outboard flange on all reducerslexpandersshould be known as the presentation flange 2.5.3.2 2- One cylindrical stud Should be permanently attached to each of the presentation flange faces at the twelve o'clock position on the respective flange bolt circles This cylindrical stud should project horizontally outboard perpendicular to the flange face and be centered on the same bolt circle as defined in ANSI B16.5 The diameter of the cylindrical stud should be 12.7 millimeters (0.5 inches) The length of thestud should be at least 25.4 millimeters (1.0inches), See Figure for illustration Lifting Lugs All reducerslexpanders should be fitted with a lifting lug This lug should be placed as near to the center of balance as possible and at a location which does not interfere with the bolting up of flanges 2.5.3.6 Type of Flanges The presentation flanges should be welded neck flanges to ensure that there is a clear inner diameter for the insertion of alignment probes If slip-on flanges are Table %Tank Ship Vapor ReducerslExpanders Principal Fittings Ship Tonnage Number of Category ReducerslExpanders A B C D Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 Presentation Flange Reserve Reducer1 Nominal Bore Number of Reserve Expanders Stocks &inches ReducerlExpanders mmlinches 304.8112 203.218 304.8112 406.4116 406.4116 304.8112 406.4116 304.8112 API RP*LLZq 71 0732290 009b048 W API RECOMMENDED PRACTICE 1124 10 VESSEL TERMINAL I VAPOR COLLECTION ARM \ \ I 12.7 mm DIAM STUD @ 12 O'CLOCK TERMINAL VAPOR HOSE CONNECTION AT LEAST ONE 15.88 rnm HOLE IN EACH HOSE FLANGE POSSIBLE OPTIONAL 15.88 mm DIAM HOLES Figure &Presentation fitted, the internal weld should be ground flush to conform to the nominal bore specification of the pipe 2.5.4 BLANK FLANGES Each presentation flange of the principal reducers1 expanders should be provided with a removable steel Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 Flange Orientation blank flange Each blank flange is to be painted yellow on its exterior surfaces (excluding the inboard-facing flange face) To accommodate the lug on the vapor line presintatidn flange, each blank flange shall have an extra hole located in the twelve o'clock position on the flange's bolt hole circle The diameter of the hole should be 15.88 millimeters (0.625 inches) SHIP,BARGE,AND TERMINAL HYDROCARBON VAPOR COLLECTION MANIFOLDS SECTION &TANK BARGE VAPOR MANIFOLD STANDARDS 3.1 Barge Tonnage Categories This section to the categories Up to 10,000 summer DWT (metric tons) (see Figure 7) Above 10,000 summer DWT (metric tons) (see Figure 8) 3.2 Manifold Position a configuration commonly called "piggy-backed." Note, however, that this piggy-back arrangement may not be appropriate where vapor collection arms are used for vapor collection and/or cargo loading If an existing working platform (or deck area) is to be used with a piggy-backed vapor line, the height of the center of the vapor line's presentation flange above the working platform should not exceed 1.52 meters (5.0 feet) be located On the midThe ships side of the loading manifold to both the port and starboard sides of the vessel They should be installed (3.0 feet) and not not less than 914.4 3.2.3 For retrofit installations aboard vessels where significant interferences (such as hose handling gear, deck houses, etc.) Prevent the location of the vapor manifo1ds as specified above, the alternate vapor line locations as described in 3.2.1 through 3.2.3 may be considered ehting working platform (or deck area) is to be used with it, then the height of the center of the vapor line's presentation flange above the working platform should not exceed meters (5.0 feet) The vapor manifolds may be located on the midship side of the loading manifold at some greater distance than that prescribed in 3.2 The distance, however, should be kept as small as practical to ensure maximum compatibility with varied shoresidevapor line configura3.2.1 11 3.2.2 The vapor manifolds may be located directly above the centerlines of the loading lines most midship, CARGO Figure 7-Tank Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 If it is not possible to locate the vapor lines on the midship side of the loading manifold, they may be located on the side furthest from midship either piggybacked or as close as practical (greater than 914.4 mil]i- 3.3 Labeling The first 1.0 meters (3.25 feet) inboard of each vapor manifold connection should be painted on its exterior surfaces excluding flange faces The painted area should be divided into three bands, with the outboard and inboard bands being red in color and 100 millimeters (4 inches) wide and the center band being yellow in color In addition, the word "VAPOR should be painted in black letters at least 50 millimeter (2inches) high on both CARGO VAPOR Barge Standard Manifold Arrangement for Tank Barges up to 10,000 Summer DWT (metric tons) A P I RP*1124 0732270 007b050 API RECOMMENDED PRACTICE 1124 12 CARGO LINE Figure &Tank CARGO LINE VAPOR LINE I Barge Standard Manifold Arrangement for Tank Barges of 10,000 Summer DWT (metric tons) and Above the forward and after sides of each vapor manifold in approximately the two o'clock and ten o'clock positions See Figure for illustration should be made of steel and fitted with flanges conforming to ANSI B16.5 3.4 Drip Pans 3.7 Flanges All barges should be provided with drip pans that comply with 33 CFR 155.310 The top of the drip pans should be situated a minimum distance of 304.8 millirneters (12 inches) below the level of the center of the reducerlexpander presentation flange The outboard flange of all vapor manifolds should be known as the presentation flange The presentation flanges should preferably be welded neck flanges to ensure a clear inner diameter for the insertion of alignment probes If slip-on flanges are fitted, the internal weld should be ground flush to conform to the nominal bore specification of the pipe The size of tank barge presentation flanges should be in accordance with Table All the presentation flanges should be kept vertical and should have plain (flat) faces (that is, raised faced flanges should not be used) A hazards analysis of vapor control operations has indicated that the cross-connection of vapor and cargo systems significantly increases the probability of fire or explosion when loading cargo with vapor control In order to prevent the possible misconnection of the vapor 3.5 Material The whole vapor manifold, including the manifold support, should be of steel and should conform to the requirements of ANSI B31.3 (1987 edition) All piping is to be electrically continuous and bonded to the vessel's hull 3.6 Valves Each vapor manifold should be fitted with a shutoff valve located near the presentation flange The valve Table Barge Presentation Flange Sizes Barge Tonnage Category (approximate) Up to 10,000 DWT (metric tons) 10,000 DWT and above (metric tons) Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 Number of ReducerslExpanders Presentation Flange Nominal Bore mmlinches 203.218 304.8112 API R P * L 91 manifold to a liquid loading line a lugged keying mechanism for thevapor presentation flanges is recommended Details on the lugged keying mechanism are as follows: The bolt locations should be arranged so that two bolts straddle the twelve o'clockposition at the top of the flange face One cylindrical stud should be permanently attached' to each of the presentation flange faces at the twelve o'clock position on the respective flange bolt circles This cylindrical stud should project horizontally outboard perpendicular to the flange face and be centered on the same bolt circle as defined in ANSI B16.5 The diameter of the cylindrical stud should be 12.7 millime- 0732290 0096051 ters (0.5 inches) Thelength of the stud should be at least 25.4 millimeters (1.0 inches) See Figure for illustration 3.8 Blank Flanges Each presentation flange should be provided with a removable steel blank flange Each blank flange is to be painted yellow on its exterior surfaces (excluding the inboard-facing flange face) To accommodate the lug cm the vapor line presentation flange, each blank flange shall have an extra hole located in the twelve o'clock position on the flange's bolt hole circle The diameter of the hole should be 15.88 millimeters (0.625 inches) SECTION &TERMINAL VAPOR MANIFOLD RECOMMENDED PRACTICES 4.1 Manifold Position Terminal vapor manifolds may be installed on either or both sides of existing cargolbunker manifolds depending upon the design of the vapor recovery system The horizontal spacing should be in keeping with the requirements for the vessels which dock at that terminal 4.2 Labeling 4.2.1 VAPOR HOSES The last 1.0 meters (3.28 feet) of each end of a vapor hose and the last 1.0 meters (3.28 feet) of the offshore end of the terminal vapor hose connection piping should be painted on its exterior surfaces excluding flange faces The painted area should be divided into three bands, with the end bands being red in color and 100millimeters (4 inches) wide and the center band being yellow in color The word "VAPOR should be painted in black letters at least 50 millimeters (2 inches) high at approximately 120 degree intervals on both ends of the vapor hose, and in approximately the two o'clock and ten o'clock positions on the terminal vapor hose connection piping's offshore end See Figure for illustration 4.2.2 VAPOR COLLECTION ARMS The last 1.0 meters (3.28 feet) of the offshore end of a vapor collection arm should be painted on ifs exterior surfaces excluding flange faces The painted area should be divided into three bands, with the end bands being red in color and 100 millimeters (4 inches) wide and the center band being yellow in color Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 The word "VAPOR" should be painted in black letters at least 50 millimeters (2 inches) high in approximately the two o'clock and ten o'clock positions on the arm's offshore end See Figure for illustration 4.3 Flanges 4.3.1 VAPOR HOSES All vapor hose flanges should conform to ANSI B16.5 and should have plain (flat) faces (that is, raised faced flanges should not be used) A hazards analysis of vapor control operations has indicated that the cross-connection of vapor and cargo systems significantly increases the probability of fire or explosion when loading cargo with vapor control In order to prevent the possible misconnection of the vapor manifold to a liquid loading line a lugged keying mechanism for the vapor presentation flange, and hence the vapor hose flanges, is recommended Details on the lugged keying mechanism are as follows: N m : The individual hose flange orientations should correspond as closely as possible to one another globally on the hose The bolt hole locations shouldbe arranged so that two holes straddle the twelve o'clock position at the top of the flange face To facilitate alignment with the stud located on the vessel vapor connection flange, the flange at each end of a vapor hose should have at least one 15.88 millimeter (0.625 inch) diameter hole located at the twelve o'clock position on the flange's bolt hole circle For ease of alignment purposes where the lay of the vapor hose may A P I R P * L L 71 0732290 0096052 M API RECOMMENDED PRACTICE 1124 14 cause alignment difficulties, any additional number of 15.88 millimeter (0.625 inch) diameter stud accommodating holes may be placed in the flange's bolt hole circle midway between the existingprimary bolt holes up to the point where there are as many stud accommodating holes as there are primary bolt holes (A maximum of one stud accommodating hole between each pair of primary bolt holes is permitted.) The terminal vapor hose connection should have one cylindrical stud permanently attached to its flange face at the twelve o'clock position on the flange's bolt hole circle This cylindrical stud should project horizontally out perpendicular to the flange face and be centered on the same bolt circle as defined in ANSI B16.5 The diameter of the cylindrical stud should be 12.7 millimeters (0.5 inches) The length of the stud should be at least 25.4 millimeters (1 inch) The bolt hole locations should be arranged so that two holes straddle the twelve o'clock position at the top of the flange face To facilitate alignment with the stud located on the vessel vapor connection flange, the vapor collection arm flange should have at least one 15.88 millimeter (0.625 inch) diameter hole located at the twelve o'clock position on the flange's bolt hole circle For ease of alignment purposes any additional number of 15.88 millimeter (0.625 inch) diameter stud accommodating holes may be placed in the flange's bolt hole circle midway between the existing primary bolt holes up to the point where there are as many stud accommodating holes as there are primary bolt holes (A maximum of one stud accommodating hole between each pair of primary bolt holes is permitted.) See Figure for illustration See Figure for illustration 4.3.2 VAPOR COLLECTION ARMS Each vapor collection arm presentation flange should conform to ANSI B16.5 and should have a plain (flat) face (that is, raised faced flanges should not be used) A hazards analysis of vapor control operations has indicated that the cross-connection of vapor and cargo systems significantly increases the probability of fire or explosion when loading cargo with vapor control In order to prevent the possible misconnection of the vapor manifold to a liquid loading line a lugged keying mechanism for the vapor presentation flange is recommended Details on the lugged keying mechanism are as follows: N m : The clock reference scheme is used here with global intent, however if the vapor collection arm has a rotating flange, the clock is only necessarily a local reference Copyright by the American Petroleum Institute Thu May 11 16:43:37 2006 4.4 Protection Against Arcing During Connection/Disconnection The facility vapor connection must be electrically insulated from the vessel vapor connection in accordance with Section 6.10 of the OCIMF International Safety Guide for Oil Tankers and Terminals Each terminal should have on hand sufficient numbers of 203.2 millimeter (8 inch), 304.8 millimeter (12 inch), and 406.4 millimeter (16 inch) reducerstexpanders to meet the needs of all of the vessels that it serves The design and labeling requirements of these reducerstexpanders are noted in 2.2.5 and 2.5.3 and are illustrated in Figures and