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Robert P.
Robert P.
00:08 Dec-22-2010
API 620 verses 650 standard?

IYO, which standard is the least restrictive in designing a tank? And which requires more NDE?

Appreciate any enlightenment...

 
 Reply 
 
Collin Maloney
Collin Maloney
02:03 Dec-23-2010
Re: API 620 verses 650 standard?
In Reply to Robert P. at 00:08 Dec-22-2010 (Opening).

API 620 covers a higher pressure and temperature rating than tanks than API 650 (atmospheric storage tanks), you need to decide what your design parameters are and then apply the relavent code to cover materials, welding, NDT etc. There is no direct answer to your question as we dont know your design eg, flat bottom tank or process tank with conical bottom etc

 
 Reply 
 
Robert P.
Robert P.
17:10 Dec-23-2010
Re: API 620 verses 650 standard?
In Reply to Collin Maloney at 02:03 Dec-23-2010 .

Thank you, Collin.

 
 Reply 
 
Len Andersen
Engineering
New York City Department of Transportation, USA, Joined Nov 2009, 31

Len Andersen

Engineering
New York City Department of Transportation,
USA,
Joined Nov 2009
31
21:42 Jan-04-2011
Re: API 620 verses 650 standard?
In Reply to Robert P. at 00:08 Dec-22-2010 (Opening).

From: Stephen Crimaudo [mailto:crimaudos@api.org]
Sent: Tuesday, January 04, 2011 3:22 PM
To: Andersen, Leonard
Subject: FW: API 620 verses 650 standard?


The only way to answer this properly is to look at the Scope of API 620, API 650 and API 653, Basically though API 650 and API 620 are equally tough to comply with. The Standards are meant for different tanks with different operating pressures and temps. API 653 includes the inspection requirements.

1. Design and Construction of Large, Welded, Low-pressure Storage Tanks
API STANDARD 620, ELEVENTH EDITION, ADDENDUM 2, AUGUST 2010

Section 1—Scope
1.1 General
The API Downstream Segment has prepared this standard to cover large, field-assembled storage tanks of the type
described in 1.2 that contain petroleum intermediates (gases or vapors) and finished products, as well as other liquid
products commonly handled and stored by the various branches of the industry.
The rules presented in this standard cannot cover all details of design and construction because of the variety of tank
sizes and shapes that may be constructed. Where complete rules for a specific design are not given, the intent is for
the Manufacturer—subject to the approval of the Purchaser’s authorized representative—to provide design and
construction details that are as safe as those which would otherwise be provided by this standard.
The Manufacturer of a low-pressure storage tank that will bear the API 620 nameplate shall ensure that the tank is
constructed in accordance with the requirements of this standard.
The rules presented in this standard are further intended to ensure that the application of the nameplate shall be
subject to the approval of a qualified inspector who has made the checks and inspections that are prescribed for the
design, materials, fabrication, and testing of the completed tank.

1.2 Coverage
1.2.1 This standard covers the design and construction of large, welded, low-pressure carbon steel above ground
storage tanks (including flat-bottom tanks) that have a single vertical axis of revolution. This standard does not cover
design procedures for tanks that have walls shaped in such a way that the walls cannot be generated in their entirety
by the rotation of a suitable contour around a single vertical axis of revolution.

1.2.2 The tanks described in this standard are designed for metal temperatures not greater than 250°F and with
pressures in their gas or vapor spaces not more than 15 lbf/in.2 gauge.

1.2.3 The basic rules in this standard provide for installation in areas where the lowest recorded 1-day mean
atmospheric temperature is –50°F. Appendix S covers stainless steel low-pressure storage tanks in ambient
temperature service in all areas, without limit on low temperatures. Appendix R covers low-pressure storage tanks for
refrigerated products at temperatures from +40°F to –60°F. Appendix Q covers low-pressure storage tanks for
liquefied gases at temperatures not lower than –325°F.

1.2.4 The rules in this standard are applicable to tanks that are intended to (a) hold or store liquids with gases or
vapors above their surface or (b) hold or store gases or vapors alone. These rules do not apply to lift-type gas
holders.

1.2.5 Although the rules in this standard do not cover horizontal tanks, they are not intended to preclude the
application of appropriate portions to the design and construction of horizontal tanks designed in accordance with
good engineering practice. The details for horizontal tanks not covered by these rules shall be equally as safe as the
design and construction details provided for the tank shapes that are expressly covered in this standard.

2. Welded Tanks for Oil Storage
API STANDARD 650, ELEVENTH EDITION, ADDENDUM 2: NOVEMBER 2009, EFFECTIVE DATE: MAY 1, 2010

SECTION 1—SCOPE
1.1 GENERAL

1.1.1 This Standard establishes minimum requirements for material, design, fabrication, erection, and testing for vertical,
cylindrical, aboveground, closed- and open-top, welded storage tanks in various sizes and capacities for internal pressures
approximating atmospheric pressure (internal pressures not exceeding the weight of the roof plates), but a higher internal pressure
is permitted when additional requirements are met (see 1.1.12). This Standard applies only to tanks whose entire bottom is uniformly
supported and to tanks in non-refrigerated service that have a maximum design temperature of 93°C (200°F) or less (see
1.1.19).

1.1.2 This Standard is designed to provide industry with tanks of adequate safety and reasonable economy for use in the storage of
petroleum, petroleum products, and other liquid products. This Standard does not present or establish a fixed series of allowable tank
sizes; instead, it is intended to permit the Purchaser to select whatever size tank may best meet his 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.
Note: A bullet (•) at the beginning of a paragraph indicates that there is an expressed decision or action required of the Purchaser. The Purchaser’s
responsibility is not limited to these decisions or actions alone. When such decisions and actions are taken, they are to be specified in
documents such as requisitions, change orders, data sheets, and drawings.

1.1.3 This Standard has requirements given in two alternate systems of units. The Manufacturer shall comply with either:
1. all of the requirements given in this Standard in SI units, or
2. all of the requirements given in this Standard in US Customary units.
The selection of which set of requirements (SI or US Customary) to apply shall be a matter of mutual agreement between the
Manufacturer and Purchaser and indicated on the Data Sheet, Page 1.

1.1.4 All tanks and appurtenances shall comply with the Data Sheet and all attachments.

1.1.5 Field-erected tanks shall be furnished completely erected, tested, and ready for service connections, unless specified otherwise.
Shop-fabricated tanks shall be furnished tested and ready for installation.

1.1.6 The appendices of this Standard provide a number of design options requiring decisions by the Purchaser, standard
requirements, recommendations, and information that supplements the basic standard. Except for Appendix L, an appendix
becomes a requirement only when the Purchaser specifies an option covered by that appendix or specifies the entire appendix. See
Table 1-1 for the status of each appendix.


Tank Inspection, Repair, Alteration, and Reconstruction
API STANDARD 653, FOURTH EDITION, ADDENDUM 1, AUGUST 2010

Scope
1.1 Introduction

1.1.1 This standard covers steel storage tanks built to API 650 and its predecessor API 12C. It provides minimum
requirements for maintaining the integrity of such tanks after they have been placed in service and addresses
inspection, repair, alteration, relocation, and reconstruction.

1.1.2 The scope is limited to the tank foundation, bottom, shell, structure, roof, attached appurtenances, and
nozzles to the face of the first flange, first threaded joint, or first welding-end connection. Many of the design, welding,
examination, and material requirements of API 650 can be applied in the maintenance inspection, rating, repair, and
alteration of in-service tanks. In the case of apparent conflicts between the requirements of this standard and API 650
or its predecessor API 12C, this standard shall govern for tanks that have been placed in service.

1.1.3 This standard employs the principles of API 650; however, storage tank owner/operators, based on
consideration of specific construction and operating details, may apply this standard to any steel tank constructed in
accordance with a tank specification.

1.1.4 This standard is intended for use by organizations that maintain or have access to engineering and inspection
personnel technically trained and experienced in tank design, fabrication, repair, construction, and inspection.

1.1.5 This standard does not contain rules or guidelines to cover all the varied conditions which may occur in an
existing tank. When design and construction details are not given, and are not available in the as-built standard,
details that will provide a level of integrity equal to the level provided by the current edition of API 650 must be used.

1.1.6 This standard recognizes fitness-for-service assessment concepts for evaluating in-service degradation of
pressure containing components. API 579-1/ASME FFS-1, Fitness-For-Service, provides detailed assessment
procedures or acceptance criteria for specific types of degradation referenced in this standard. When this standard
does not provide specific evaluation procedures or acceptance criteria for a specific type of degradation or when this
standard explicitly allows the use of fitness-for-service criteria, API 579-1/ASME FFS-1 may be used to evaluate the
various types of degradation or test requirements addressed in this standard.

1.2 Compliance with This Standard
The owner/operator has ultimate responsibility for complying with the provisions of this standard. The application
of this standard is restricted to organizations that employ or have access to an authorized inspection agency as
defined in 3.3. Should a party other than the owner/operator be assigned certain tasks, such as relocating and
reconstructing a tank, the limits of responsibility for each party shall be defined by the owner/operator prior to
commencing work.

1.3 Jurisdiction
If any provision of this standard presents a direct or implied conflict with any statutory regulation, the regulation shall
govern. However, if the requirements of this standard are more stringent than the requirements of the regulation, then
the requirements of this standard shall govern.

1.4 Safe Working Practices
An assessment shall be made of the potential hazards to which personnel may be exposed when conducting
internal tank inspections, making repairs, or dismantling tanks. Procedures shall be developed according to the
guidelines given in API 2015, API 2016, and API 2217A that will include safeguard for personnel health and
safety, prevention of accidental fires and explosions, and the prevention of property damage. Conformance to
permit procedures is an essential safe work practice for protection of personnel and property.Where welding and
hot work are involved, API 2009 states “Except in areas specifically designated as safe for hot work, a hot work
permit shall be obtained before starting any work that can involve a source of ignition.”
Special procedures may need to be developed for certain activities described in this standard that are not fully
covered by the referenced API publications; e.g. safety precautions for personnel accessing floating roof tanks that
are in service, or gas freeing the bottom side of a tank. Appendix B of API 2009 provides brief information on inerting
tanks. Use of inerting as a safety precaution should address personnel hazards introduced when using inert gas in
the workplace and implementation should be done in consultation with specialists that are familiar with such
processes. Finally, procedures must comply with any federal or state safety regulations pertaining to “confined
spaces” or any other relevant provisions.
10
10


Stephen Crimaudo
Senior Associate, Standards
American Petroleum Institute
1220 L Street, NW
Washington, DC 20005-4070
Phone: 202-682-8151
Fax: 202-962-4797
crimaudos@api.org

 
 Reply 
 
Robert P.
Robert P.
16:42 Feb-09-2011
Re: API 620 verses 650 standard?
In Reply to Len Andersen at 21:42 Jan-04-2011 .

Len,
Thank you for scope of both standards.

We presently have a 316L matl 3/8" wall thk. cyclone separator (F&D head & cone bottom) that the Client has speced out to API 620 Code. The operating temp is 215 deg F and design temp is 300 deg F, op pressure is 3 psig to 5 in. wc vacuum and design pressure is 7.5 psig to 15 in. wc vacuum.

Test reqs are 10 psig hydro and spot RT w/ 85% jnt efficiency.

API 620 states in 5.26 Radiographic/Ultrasonic Examination
5.26.4.3 (a) When parts of tanks do not require complete examination, circumferential joints in cylindrical or conical surfaces need to be prepared and examined for a distance of only 3 in. on each side of any intersection with a longitudinal joint. All joints in a spherical, torispherical, or ellipsoidal shape or in any other surface or double curvature shall be considered longitudinal joints.

Does this mean that ALL "T" type joints (circ.-to-long seams) require RT?

Appreciate your interpretation and comments,
Robert P.

 
 Reply 
 
Len Andersen
Engineering
New York City Department of Transportation, USA, Joined Nov 2009, 31

Len Andersen

Engineering
New York City Department of Transportation,
USA,
Joined Nov 2009
31
20:15 Feb-09-2011
Re: API 620 verses 650 standard?
In Reply to Robert P. at 00:08 Dec-22-2010 (Opening).

Robert,
I would guess examine all Tee's and "All joints". Tell the client your interpretation and get agreement. Asking

Stephen Crimaudo
Senior Associate, Standards
American Petroleum Institute
1220 L Street, NW
Washington, DC 20005-4070
Phone: 202-682-8151
Fax: 202-962-4797
crimaudos@api.org

will give a better than my guess answer. With such expensive equipment my guess in that the client would wish conservative more complete inspection!
Len

 
 Reply 
 
Robert P.
Robert P.
22:32 Feb-10-2011
Re: API 620 verses 650 standard?
In Reply to Len Andersen at 20:15 Feb-09-2011 .

Guess that's the best solution.

Cause I am still confused. Later on in API 620 Standard it states in 7.17.3 Number and Location of Spot Examination:
7.17.3.2 At least one spot shall be examined from the first 10 ft of completed joint of each type and thickness welded by each welder or welding operator. Thereafter, without regard to the number of welders or welding operators involved, one additional spot shall be examined for each additional 50 ft - or remaining fractional part of this length - of each type and thickness of welded longitudinal, meridional, or equivalent joint subject to examination. The inspector shall designate the locations of all spots that are to be examined, of which at least 25% of the selected spots shall be at junctions of meidional and latitudinal joints with a minimum of two such intersections per tank (see 7.15.6.2), both under the foregoing provisions and the provisions of 7.17.3.4. Such spots need not have any regularity of spacing.

7.17.3.4 Whenever spot examination is required for circumferential or latitudianal joints other than those considered in 7.17.3.2 and 7.17.3.3, one spot shall be examined from the first 10 ft of completed joint of each type and thickness welded by each welder or welding operator if not already done on other joints for the same welder or welding operator on the same structure.

If ALL "T" joints require RT then all of the above would already be covered unless the vessel had "T" joint intersections that were spread apart more than 50ft.

 
 Reply 
 
Robert
Robert
23:41 Feb-14-2011
Re: API 620 verses 650 standard?
In Reply to Robert P. at 22:32 Feb-10-2011 .

Len,

After conferring other NDE inspectors on the subject of extent of NDE testing requirements to API 620 Standard, the following describes their interpretation of the extent of RT radiographic testing.

As an example of a large, welded, low pressure storage tank that is NOT used for storage of liquefied hydrocarbon gases or refrigerated products and not intended for lethal service. A storage tank requiring spot radiography (85% JE)and 120 linear feet of welded seam.

Assuming only one welder, and the joint design & thickness remain the same;

(7.17.3.2 At least one spot shall be examined from the first 10 ft of completed joint)
First RT shot would be taken in the first 10 feet of weld,

(one additional spot shall be examined for each additional 50 ft)
second shot taken between 10 ft and 60 ft,

(one additional spot shall be examined for each additional 50 ft)
third shot taken between 60 ft and 110 ft,

(one additional spot shall be examined for each additional 50 ft - or remaining fractional part of this length)
fourth shot taken betw 110 and 120 ft (the remaining fractional part).

(The inspector shall designate the locations of all spots that are to be examined, of which at least 25% of the selected spots shall be at junctions of meridional and latitudinal joints)
25% of these 4 shots must be "T" joints therefore equals 1 "T" joint shot,

(with a minimum of two such intersections per tank)
however code states a minimum of 2 such intersections per tank, therefore of the 4 shots total with 2 of these being "T" joints.

(5.27.11 All longitudinal butt welds in the nozzle neck and transition piece if any, and the first circumferential butt weld in the neck closest to side wall, excluding the neck to flange weld shall receive 100% radiographic examination.)

these types of welds may be included in the examined weld lengths above if they are of the same joint design and thickness, if not they will be radiographed in addition to the above required shots per lengths.

Appreciate your thoughts to this interpretation,
Robert

 
 Reply 
 
Robert
Robert
23:10 Feb-15-2011
Re: API 620 verses 650 standard?
In Reply to Robert at 23:41 Feb-14-2011 .

(5.27.11 All longitudinal butt welds in the nozzle neck and transition piece if any, and the first circumferential butt weld in the neck closest to side wall, excluding the neck to flange weld shall receive 100% radiographic examination.)

I have a retraction to make here in that these types of welds may NOT be included in the examined weld lengths above and they are to be radiographed in addition to the above required shots per lengths.

 
 Reply 
 
nimesh
nimesh
08:49 Mar-31-2014
Re: API 620 verses 650 standard?
In Reply to Collin Maloney at 02:03 Dec-23-2010 .

Dear Sir,
Please send me ndt proceures for above ground storage tank inspection activity asper api 650 & asme sec 5

 
 Reply 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
02:29 Apr-03-2014
Re: API 620 verses 650 standard?
In Reply to nimesh at 08:49 Mar-31-2014 .

Nimesh,

You should be talking to your level 3 for these procedures.

 
 Reply 
 
Steve Moraga
Steve Moraga
23:33 Nov-29-2018
Re: API 620 verses 650 standard?
In Reply to Csaba Hollo at 02:29 Apr-03-2014 .

Absolutely go to a Level 3 Inspector for procedural development.

 
 Reply 
 
Anish
Anish
17:46 Aug-30-2019
Re: API 620 verses 650 standard?
In Reply to Steve Moraga at 23:33 Nov-29-2018 .

What is Radiography requirements for storage tanks constructed as per API 620

 
 Reply 
 

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