API 620 Tanks (Field Erected).pdf

TECHNICAL SPECIFICATION

DATE: 01 MAY 2003

API 620 TANKS (Field Erected)

MF40-2F

ENGINEERING SERVICES BY KBR TECHNICAL SERVICES, INC.

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TABLE OF CONTENTS Section 1. 1.1 1.2 1.3 1.4 1.5 1.6 2. 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 3. 3.1 4. 4.1 5. 5.1 5.2 5.3 5.4 5.5 6. 6.1 6.2 6.3 7. 7.1 7.2 7.3 7.4 7.5 7.6 8. 8.1 8.2 8.3 8.4 9.

Title Page No. GENERAL ........................................................................................................................... 1 Scope .................................................................................................................................. 1 Units of Measurement ........................................................................................................... 2 KBR Documents, Codes, and Industry Standards ................................................................... 2 Design Drawings and Data.................................................................................................... 2 Technical Data to be Furnished with the Tank Manufacturer's Proposal ................................... 2 Documentation and Records ................................................................................................. 3 DESIGN............................................................................................................................... 3 General................................................................................................................................ 3 Tank Shells .......................................................................................................................... 4 Tank Bottoms....................................................................................................................... 4 Tank Roofs .......................................................................................................................... 4 Corrosion Allowances ........................................................................................................... 4 Nozzles and Connections...................................................................................................... 5 Anchor Bolting...................................................................................................................... 5 Structural Steel..................................................................................................................... 6 TANK APPURTENANCES AND ACCESSORIES .................................................................. 6 General................................................................................................................................ 6 TANK INSULATION ............................................................................................................. 7 General................................................................................................................................ 7 MATERIALS ........................................................................................................................ 7 General................................................................................................................................ 7 Filler Materials...................................................................................................................... 7 Bolting ................................................................................................................................. 7 Gaskets ............................................................................................................................... 7 Supplementary Materials ...................................................................................................... 7 FABRICATION .................................................................................................................... 7 General................................................................................................................................ 7 Welding ............................................................................................................................... 8 Tolerances ........................................................................................................................... 8 INSPECTION, REJECTION, EXAMINATION, REPAIRS, TESTING ........................................ 8 Purchaser's Inspection.......................................................................................................... 8 Third Party Inspection ........................................................................................................... 8 Rejection ............................................................................................................................. 8 Examinations ....................................................................................................................... 8 Repairs ................................................................................................................................ 9 Testing ................................................................................................................................ 9 MARKING, PAINTING, AND SHIPPING...............................................................................10 Marking...............................................................................................................................10 Painting ..............................................................................................................................10 Preparation for Shipping ......................................................................................................10 Shipping .............................................................................................................................10 MANUFACTURER'S DATA REPORTS ................................................................................10

1. GENERAL 1.1 Scope This specification defines mandatory technical requirements for the design, materials, fabrication, shipping, erection, inspecting, and testing of API 620 tanks. Tanks supplied to this specification shall be limited to flat bottom, single wall, cylindrical shell, dome or umbrella roof tanks.


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1.2 Units of Measurement US Customary units or metric units of measurement shall be used by the manufacturer for drawings and calculations consistent with the units of measurement shown on Purchaser's drawings or data sheets. 1.3 KBR Documents, Codes, and Industry Standards The following documents are referenced herein and form part of the Order. Additional KBR documents, when applicable, will be listed on the Requisition. The issue dates of KBR documents shall be as specified in the Requisition. Current editions of the industry standards including all mandatory addenda in effect at the time of the Order shall apply unless otherwise indicated. (Note: KBR will be referred to as the Purchaser.) KBR DOCUMENTS 4-7TS, "General Welding Requirements" MF40-1PS, “General Purchasing Requirements for API Storage Tanks" P4-6TS, "Buttweld End Preparation for Field Welds - Piping and Equipment" (Only When Applicable) P18-1D, "Selection of Gasket Materials" SDR-1MDMF, "Supplier Drawing and Data Requirements for Pressure Vessels, API Tanks, Vessel Trays and Internals" AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) ASME B1.20.1, "Pipe Threads, General Purpose (Inch)" ASME B16.5, "Pipe Flanges and Flanged Fittings NPS 1/2 through NPS 24" ASME B16.47, "Large Diameter Steel Flanges NPS 26 through NPS 60" AMERI CAN PETROLEUM INSTITUTE (API) API 620, "Design and Construction of Large, Welded, Low Pressure Storage Tanks" API 650, "Welded Steel Tanks for Oil Storage" API 2000, "Venting Atmospheric and Low-Pressure Storage Tanks -Nonrefrigerated and Refrigerated" AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC) AISC, "Manual of Steel Construction, Allowable Stress Design" 1.4 Design Drawings and Data 1.4.1 The Purchaser will furnish the manufacturer with drawings or data sheets specifying the tank configuration, dimensions, capacity, generic material requirements, design pressures and temperatures, allowable heat leak for heated tanks, product specific gravity, corrosion allowance, insulation and painting requirements, wind, earthquake, and snow load design criteria, certain construction details and engineering data as required by the manufacturer to mechanically design and construct the tank. 1.4.2 Acceptance of Supplier drawings and data with details, which deviate from those shown on Purchas er's drawings, data sheets, or specifications, does not constitute acceptance of the deviations. Manufacturer shall obtain separate written approval from Purchaser for all such deviations, prior to submission of drawings and data, for Purchaser's review and acceptance. 1.5 Technical Data to be furnished with the Tank Manufacturer's Proposal The following technical information shall be included as a part of the proposal: a.

The proposed plate thickness and material specifications for the roof, shell, bottom, annular plates, and compression rings

b.

The proposed type of roof, roof radius, and type of welded roof joints


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c.

The proposed insulation type and thickness for insulated tanks

d.

Size and quantity of anchor bolts or straps, if required

e.

Tank dimensions and liquid height when the manufacturer is responsible for sizing the tank for a specified design capacity

f.

Foundation design loads for Purchaser's use in designing tank foundations.

The required loads are as follows: Load shell dead load roof dead load (applied to shell) insulation dead load (applied to shell) roof live load (applied to shell) roof partial vacuum load (applied to shell) wind moment and shear at tank bottom earthquake moment and shear at tank bottom (tank full of liquid) 8. product and design pressure loads on tank bottom 9. test water and test pressure loads on tank bottom 10. tank bottom insulation load 11. maximum uplift on each anchor bolt or strap 1. 2. 3. 4. 5. 6. 7.

Units lb/ft (N/m) lb/ft (N/m) lb/ft (N/m) lb/ft (N/m) lb/ft (N/m) ft-lb (N·m) ft-lb (N·m)

of circumference of circumference of circumference of circumference of circumference and lb (N) and lb (N)

2

lb/ft (Pa) 2 lb/ft (Pa) 2 lb/ft (Pa) lb (N)

The earthquake moments transmitted to the Purchaser must include both the overturning moment at the bottom of the tank and the overturning moment applied to the tank foundation. The moment applied to the tank foundation shall be calculated in accordance with the paper titled "BASIS OF SEISMIC DESIGN PROVISION FOR WELDED STEEL OIL STORAGE TANKS" published in API Proceedings 1978, 43rd Midyear Meeting. g.

Calculated liquid slosh heights (under design earthquake conditions).

h.

Size, quantity and catalog information for the pressure and vacuum relief valves including spare valves.

i.

Catalog information on proposed level gauge, level alarms and transmitters.

1.6 Documentation and Records The Seller shall submit drawings and data of the type and quantity as specified on the Purc hasing Standard MF40-1PS and Supplier Drawings and Data Requirements Form (SDR-2MF). Instructions and requirements for Supplier's drawings and data are contained in Purchasing Standard SDR-1MDMF. 2. DESIGN 2.1 General 2.1.1 Design pressures, temperatures, product specific gravity, corrosion allowance, generic material specifications, insulation and painting requirements, wind, earthquake, and snow load design criteria, and storage capacity will be specified on the Purchaser's drawings or data sheets. 2.1.2 Normal and emergency venting shall be in accordance with API 2000.


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2.2 Tank Shells 2.2.1 No shell course shall have a thickness less than the course above it except for local reinforcement at the roof to shell junction. 2.2.2 Shell seams shall be located to clear openings to the maximum extent possible. 2.2.3 The maximum thickness of shell plates shall be 1 1/2 in. (38 mm). 2.2.4 Longitudinal and circumferential buttwelds in steel over 3/4 in. (19 mm) thick having a minimum 2 specified ultimate tensile strength over 70 000 psi (482 N/mm ) shall be designed for a joint efficiency of 1.0. 2.3 Tank Bottoms 2.3.1 Buttwelded annular bottom plates shall be furnished under liquid-containing shells. 2.3.2 Bottom plates inside the annular plates may be lap-welded with full fillet welds with the lap toward the direction of drainage. Buttwelded bottom plates shall be furnished when specified on the design drawings or data sheets. 2.3.3 The minimum thickness of bottom plates for single wall tanks shall be 1/4 in. (6.35 mm) exclusive of corrosion allowance in accordance with API 620, Paragraph 5.9.4.2. 2.4 Tank Roofs 2.4.1 Tank roofs shall generally be of a dome configuration with a minimum roof radius of 0.8 x D and maximum roof radius of 1.2 x D, where D is the nominal diameter of the tank. Unless otherwise specified, 2 tank roofs shall be designed for a minimum load of 25 lb/ft (1.2 kPa). 2.4.2 Roof plates may be lap-welded. Buttwelded roof plates shall be furnished when specified on the design drawings or data sheets. 2.4.3 All components of dome or umbrella roofs shall be designed to resist specified loads and pressures. Consideration shall be given to bending moments induced in undished roof plates such that the intent of Paragraph 5.1.1 of API 620 is met. 2.4.4 When tanks are specified to have an internal rubber or epoxy lining, the roof shall be selfsupporting or have an external supporting structure. 2.4.5 The vapor space volume above the design high liquid level, upon which the nominal capacity is based, shall not be less than 2% of the total liquid capacity. 2.5 Corrosion Allowances 2.5.1 The full specified corrosion allowance shall be added to the calculated thicknesses of shell, roof, and to the minimum shell thickness required by API 620, Paragraph 5.10.4.1 (a) and to the minimum thickness of bottom plate specified in Paragraph 2.3.3 above. 2.5.2 One half the specified corrosion allowance shall be added to each surface of internal structural members.


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2.6 Nozzles and Connections 2.6.1 Flange bolt hole orientation shall be as follows: a.

When the flange is in a horizontal plane, the bolt holes shall straddle the north-south centerlines indicated on the design drawings.

b.

When the flange is in a vertical plane, the bolt holes shall straddle the vertical centerline of the flange.

c.

Bolt hole orientation of flanges not specified above will be shown on the design drawings as per Figure 1.

FIGURE 1: BOLT HOLE ORIENTATION

2.6.2 Raised face and flat face flanges shall be furnished with a stock gasket surface finish. 2.6.3 Flanges for external nozzles NPS 24 and smaller shall be in accordance with ASME B16.5 for the rating and type of facing specified. Flanges for external nozzles NPS 26 through NPS 60 shall be in accordance with ASME B16.47, Series B. For sizes over NPS 60, flange dimensions will be shown on the drawings or data sheets. Manways or other access openings may be designed in accordance with API 620 Paragraph 5.20. 2.6.4 Each reinforcing pad or segment, if more than one piece is used, shall be furnished with two NPS 1/4 NPT threaded holes. Welds in segmented two-piece reinforcing pads on shell shall be in circumferential direction. The outside of the reinforcing pads shall be ground smooth before welding to tank. 2.6.5 Threaded connections shall be Class 6000 couplings. 2.6.6 All threaded connections shall have NPT threads in accordance with ASME B1.20.1. 2.7 Anchor bolting 2

Anchor bolting shall be designed for an allowable tensile stress of 15 000 psi (103.4 N/mm ) on the root area of the thread. Allowable stress may be increased 33% for wind or earthquake loadings. The nominal anchor bolt diameter shall not be less than 1 in. (25 mm) exclusive of any corrosion allowance per API 620, Paragraph 5.11.2.3.


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2.8 Structural Steel 2.8.1 Ladders, stairways, platforms and handrails shall be furnished as follows: a.

For non-insulated tanks, or "hot" tanks insulated for heat conservation: Tanks 20 feet (6 m) or less in height shall be furnished with a ladder without a cage. Tanks greater than 20 feet (6 m) in height shall be furnished with a spiral stairway. The spiral stairway on insulated tanks shall be furnished with an inside stringer; the treads shall not be welded directly to the shell.

b.

The ladders, stairways, platforms and handrails may be of the tank manufacturer's standard design in accordance with Table 3-17 and 3-18 of API 650 and AISC.

2.8.2 A landing platform shall be furnished at the top of the ladder or stairway. Wing rails extending 6 feet (2 m) from the edge of the landing platform (on two sides along the circumference of the tank) shall be furnished. 2.8.3 Walkways shall be furnished extending from the landing platform to the center of the roof or to other platforms for access to and maintenance of roof-mounted accessories when shown on the tank drawings. 2.8.4 All walkways, stairways, and platforms shall be furnished with handrails on open or exposed sides. 2

2.8.5 Platforms shall be designed for a uniform live load of 75 lb/ft (3.6 kPa). 2.8.6 Unless specified on tank drawings or data sheets, the platform and stairway flooring shall be galvanized rectangular welded grating, 1 inch x 3/16 inch (25 x 5 mm) bearing bars on 1 3/16 in. (30 mm) centers and cross bars on 4 inch (100 mm) centers. If checker plate is specified, it shall be 1/4 in. (6 mm) thick. Quotations shall be based on platforms using checker plate flooring with a price adjustment stated for grating flooring. The tank manufacturer shall request direction from the Purchaser, as to the type of flooring, prior to fabrication. 3. TANK APPURTENANCES AND ACCESSORIES 3.1 General Tanks shall be furnished with the following: a.

a minimum of one 24 inch (610 mm) outside diameter roof manhole and one 24 inch (610 mm) outside diameter shell manhole.

b.

one liquid drawoff sump with internal piping and shell nozzle

c.

one ground-reading level indicator gauge with operation checker, float, float guide wire assembly, and tape block valve

d.

pressure/vacuum vent valves (including an installed spare to permit maintenance on any one valve) equipped with car seal open block valves on the tank side

e.

tank heaters, internal piping and shell nozzles, when specified

f.

shell nozzles and supports for side entering mixers, when specified

g.

four grounding (earthing) lugs

h.

a scaffold cable support for tanks over 18 ft (5.5 m).


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i.


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Emergency vent in accordance with API 2000.

4. TANK INSULATION 4.1 General If required, the insulation system shall generally consist of cellular glass blocks, mineral fiber blankets, or foamed-in-place polyurethane for the shell and/or roof of the tank. Insulation will not normally be required for the bottom of the tank. The insulation system shall be designed to limit the heat leak to the specified amount. External roof and shell insulation shall be covered with an aluminum vapor barrier unless otherwise specified in the Order. 5. MATERIALS 5.1 General 5.1.1 All materials shall be new and as specified in the Order. 5.1.2 Material shall be impact tested when required by API 620. 5.2 Filler Materials Welding rods, electrodes, and wires shall be selected in accordance with Purchaser's Technical Standard 4-7TS. 5.3 Bolting 5.3.1 Bolt heads and nuts shall be heavy hex. 5.3.2 Stud bolts shall be threaded their full length. 5.4 Gaskets Gaskets shall be 1/16 inch (1.5 mm) minimum thickness non-asbestos fiber sheet compatible with the stored product or as specified on drawing or data sheet and shall comply with Purchaser's Design Specification P18-1D, unless specified otherwise on drawings and data sheets. 5.5 Supplementary Materials The tank manufacturer shall furnish blind flanges, manhole covers, bolts, and gaskets for all manholes and all other nozzles specified to be furnished with blinds. 6. FABRICATION 6.1 General 6.1.1 Holes shall not be cut into the shell for erection purposes. 6.1.2 Plate misalignment shall not be corrected by grinding off plate thickness to reduce offset. 6.1.3 Arc strikes on the tank shall be avoided. When they occur, the surface shall be conditioned to eliminate surface stress raisers and shall be examined by the magnetic particle or liquid penetrant method.


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6.1.4 Weld bevels for stub end nozzles shall be in accordance with Purchaser's Standard P4-6TS for the size, schedule, and style of bevel specified. 6.2 Welding 6.2.1 Welding shall be in accordance with the applicable construction code and Purchaser's Technical Standard 4-7TS. 6.2.2 Fabrication involving welding shall not be sublet to others without the prior approval of the Purchaser. 6.3 Tolerances 6.3.1 Tank nozzles shall be installed within the following tolerances: a.

Projection from the inside of the tank to the face of flange ±1/8 in. (±3.5 mm).

b.

Elevation or orientation ±1/4 in. (±6.5 mm).

c.

Flange tilt in any plane ±1/2 degree but not to exceed 3/16 in. (5 mm).

d.

For hillside nozzles, from face of flange to centerline of tank and from centerline of tank to centerline of nozzle ±1/4 in. (±6.5 mm).

e.

Flange bolt hole orientation ±1/16 in. (1.5 mm).

7. INSPECTION, REJECTION, EXAMINATION, REPAIRS, TESTING 7.1 Purchaser's Inspection All materials and fabrication work shall be subject to inspection (shop and site) by the Purchaser. The manufacturer's drawings shall be made available to the Purchaser's inspector at the time of inspection. 7.2 Third Party Inspection The tank shall be subject to inspection by Purchaser’s qualified inspectors or by an approved third party inspection agency in the shop and in the field during fabrication, erection, and testing. The qualification of the inspector shall satisfy the requirement of API 620, Paragraph 7.2.1. 7.3 Rejection 7.3.1 Completed tanks, parts of tanks, or materials containing defects originating with the manufacturer's design, materials, or workmanship, or that are not in complete compliance with the requirements of the Order will be rejected. 7.3.2 Discovery of such conditions after inspection and acceptance of the tank or tank components by the Purchaser does not relieve the manufacturer of his responsibility to comply with the requirements of the Order. 7.4 Examinations 7.4.1 Longitudinal and circumferential buttwelds in steel over 3/4 in. (19 mm) thick having a minimum 2 specified ultimate tensile strength over 70 000 psi (482 N/mm ) shall be fully radiographed.


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7.4.2 In addition to the construction code requirements, the finished surfaces of the following welds shall be examined by the magnetic particle or liquid penetrant method: a.

welds joining the bottom shell course to the tank bottom

b.

all structural welds joining attachments (clips, stiffening rings, etc.) to the tank.

7.5 Repairs 7.5.1 Welds with defective areas shall have: a.

the defect removed

b.

confirmation of defect removal by magnetic particle or liquid penetrant examination

c.

repair welding using qualified welding procedures

d.

re-postweld heat treatment if originally required.

7.5.2 The finished weld-repair shall be radiographed if originally required and the surface shall be re-examined by magnetic particle or liquid penetrant examination. If the repair involves serious alterations, the approval of the Purchaser shall be obtained before proceeding with the repair. 7.6 Testing 7.6.1 Testing shall be in accordance with the construction code. 7.6.2 The tank manufacturer shall be responsible for conducting the tank hydrostatic-pneumatic test. Any limitations on filling rates or stage filling requirements for foundation consolidation will be specified by the Purchaser. 7.6.3 Prior to the hydrotest, the inside of the tank shall be cleaned by sweeping, vacuuming, or other methods so that the tank will be "broom clean" and free of all trash, dirt, welding rod stubs, and other construction debris. 7.6.4 The tank manufacturer shall prepare a hydrostatic–pneumatic test procedure which shall state the maximum filling rate based on the total available venting-out capacity, taking into consideration all the pressure vents and the pressure/vacuum combination vents that are provided for normal and emergency venting per API 2000. This procedure shall also state the maximum emptying rate based on the total available venting-in capacity, taking into consideration all the vacuum vents and the pressure/vacuum combination vents that are provided for normal venting only per API 2000. Such filling and emptying rates shall not be exceeded during hydrotest at any time. The tank manufacturer may take into consideration the venting capacity of the roof manway or other roof connection in the calculation of emptying and filling rate, but the hydrotest procedure must clearly state that these openings must be open during filling and empting the tank. 7.6.5 The hydrotest shall be conducted with all accessories and appurtenances installed. 7.6.6 Tanks constructed of austenitic stainless steel or austenitic stainless steel clad material shall be hydrotested with potable water only; no salt, brackish, or raw river water shall be used. Parts of a tank that cannot be completely drained shall be flushed with boiler condensate or demineralized water having a maximum chloride content of 5 ppm. The Purchaser will make arrangements for a supply of potable and/or 5 ppm maximum chloride content test water. 7.6.7 After completion of the hydrotest, the tank manufacturer shall drain the tank and open the tank for inspection. Final cleaning of the tank will be by the Purchaser.


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8. MARKING, PAINTING, AND SHIPPING 8.1 Marking 8.1.1 Stamping on all austenitic steel materials and impact tested materials shall be with "low stress" steel stamps having round or "U" shaped cross sections or with "interrupted dot" die stamps. 8.1.2 Marking paint or water insoluble ink for use on austenitic and high nickel alloy steels shall contain no substance (e.g., metallic pigments, sulfur, or chlorides) which would be harmful to these materials at ambient or elevated temperatures. The manufacturer shall submit analysis of marking material to the Purchaser. Submittal shall demonstrate (by chemical analysis and history of use) that the material meets these requirements. 8.1.3 Tanks shall be provided with nameplate, in accordance with API 620, Paragraph 8.1.1. 8.2 Painting Surface preparation and painting shall be as specified on the tank drawings or data sheets. 8.3 Preparation for Shipping 8.3.1 All machined and threaded surfaces of carbon steel materials shall be coated with one of the following rust preventatives or equal approved by the Purchaser: E. F. Houghton Co. Rust-Veto No. 342 Exxon Chemical Co. Rust-Ban No. 326 8.3.2 Weld bevels of carbon steel materials shall be coated with one of the following weldable rust preventatives or equal approved by the Purchaser: "Deoxaluminite" manufactured by:

"d-Oxal" manufactured by: supplied by:

Special Chemicals Corp. 100 South Water Street Ossining, N.Y. 10562, U.S.A. Air Products Limited Planet Weld Equipment Limited Wembley, England

8.4 Shipping Requirements and responsibilities for transporting material to the construction site shall be as specified in the Order. 9. MANUFACTURER'S DATA REPORTS A Manufacturer's Data Report with a certificate of compliance as shown on the next page shall be completed for each tank in accordance with API 620, Paragraph 8.3 and submitted to the Purchaser upon completion of all fabrication and testing. A separate Manufacturer's Data Report is required for each tank in a group of identical tanks.


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MANUFACTURER'S DATA REPORT FOR LOW -PRESSURE STORAGE TANK Built to API Standard 620 1.

Job No __________________________Purchase Order No.____________________________________ Tank No. _________________________Supplier Order No. ____________________________________

2.

Manufactured by ________________________For ___________________________________________

3.

Manufacturer's Tank Serial No. ______________Year of Completion _____________________________

4.

Fluid to be stored ________________Minimum Design Temperature _____________________________

5.

Type of Tank _________________________________________________________________________

6.

Inner Shell: Diameter __________Height ___________Nominal Capacity _____________________ bbls

7. List Manufacturer's reference drawings giving details for tanks, material specification, connection, etc: ________________________________________________________________________________________ ________________________________________________________________________________________ 8.

Design Pressure for Gas or Vapor Space at Top of Tank _______________________________________

9. Maximum Permissible Specific Gravity of Liquid Contents to be Stored ________________________________________________________________________________________ 10. Maximum Elevation to which Tank may be filled with Liquid of design specific gravity, with Full Design Pressure above surface _____________________________________________________________________________________ 11. Maximum Elevation to which Tank may be filled with Water for Test Purposes: ______________________ 12. Pressure and Vacuum Relieving Devices ___________________________________________________ We certify that the statements made in this report are correct and that the design, materials, construction, and workmanship on this low-pressure tank conform to the requirements of API Standard 620 "Recommended Rules for Design and Construction of Large Welded, Low-Pressure Storage Tanks" _______________, and applicable supplementary requirements of this Purchaser's Specification. Date ____________Signed ______________________________By ________________________________ Manufacturer CERTIFICATE OF INSPECTION: I, the undersigned, having the required inspection qualifications and being employed by have inspected the tank described in this Manufacturer's Data Report in accordance with the standards listed, and state that to the best of my knowledge and belief, the Manufacturer has constructed this tank in accordance with the applicable sections of the listed standards. By signing this certificate, neither the inspector nor his employer makes any warranty, expressed or implied, concerning the tank described in the Manufacturer's data report. Furthermore, neither the inspector nor his employer shall be liable in any manner for any personal injury or property damage or loss of any kind arising from or connected with this inspection. Date _________________

_____________________________________________________ (Inspector's Signature)

API 620 Tanks (Field Erected).pdf

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