The main purpose of this article to provide a quick comparison of API 610 11th Edition and API 610 12th Edition. This article is useful for pump specialist, design engineers and Manufacturers.
Comparison of API 610 11th Edition and API 610 12th Edition
Year of Release
| Description | API 610 11th Edition | API 610 12th Edition |
| Year of Release | Released on September 2010 | Released on January 2021 |
| No. of pages | Total no. of pages: 220 | Total no. of pages: 233 |
Equivalent ISO for API 610
| Description | API 610 11th Edition | API 610 12th Edition |
| Equivalent ISO reference | API 610 11th Edition is equivalent to ISO 13709:2009 – (Identical), Centrifugal pumps for petroleum, petrochemical and natural gas industries |
Equivalent ISO Reference is not mentioned |
BB1 Pump Type
In API 610 12th Edition, the BB1 type pump is further classified into two types, as mentioned in the below table.
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| BB1 Pump Type | API 610 11th Ed – 4.2.2.7
API 610 12th Ed – 4.2.2.8 |
As per API 610 11th edition, BB1 pump is Foot mounted type
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As per API 610 12th edition, BB1 pump is classified as two type
BB1-A: Foot Mounted BB1-B: Near Centerline Mounted |
| BB1-A: Foot Mounted
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| BB1-B: Near Centerline Mounted
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Hierarchy of Requirements
In API 610 12th Edition, the hierarchy of requirements are clearly stated
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Hierarchy of Requirements | API 610 11th Ed – Not Applicable
API 610 12th Ed – 5.3 |
Not stated in API 610 11th Edition | The hierarchy of requirements is clearly stated in this edition.
1. In case of conflict between API 610 and the inquiry, then inquiry shall govern. 2. After purchase, the purchase order shall govern. 3. The requirements specific to a particular pump type in “Section 9 – Specific Type of Pump” conflict with any other section, the requirements of Section 9 of API 610 shall govern. |
Pump Design Life
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Minimum Service Life | API 610 11th Ed – 6.1.1
API 610 12th Ed – 6.1.1 |
The minimum service life of the pump is mentioned as 20 years and at least 3 years of uninterrupted operation | In the current edition of API 610, the design life is not specified. Pump Manufacturer shall advise in the proposal any component designed for a finite life. |
Field Proven Model
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Field Qualification / Field Proven | API 610 11th Ed – Not Applicable
API 610 12th Ed – 6.1.1 |
Field Qualification/Field-proven is not available | API 691 reference shall be provided in this latest edition. This clause is newly introduced in this edition. Purchasers can use their engineering judgment in determining what equipment is field-proven. |
Pump Flange Rating
Flange rating of pump types is clearly defined in the API 610 12th Edition.
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Flange Rating | API 610 11th Ed – Not Applicable
API 610 12th Ed – 6.1.1 |
The Pump flange rating for axially split, one- and two-stage, between-bearings pumps and single-casing, vertically suspended pumps shall have a pressure rating equal to that of an ISO 7005-2 PN20 cast iron or ISO 7005-1 PN20 steel flange of a material grade corresponding to that of the pressure casing. | The flange rating of pump types BB1, VS1, VS2, VS3, VS4, VS5, VS6, and VS7 shall have the flange pressure rating equal to ASME B16.5, Class 150 steel flange of material grade corresponding to that of the pressure casing; |
Pump Parallel Operation
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Pump Parallel Operation | API 610 11th Ed – 6.1.11
API 610 12th Ed – 6.1.13 |
The pumps are in parallel operation condition, the following condition shall meet 1. The pump head curves shall be continuously rising to shutoff 2. The head rise from rated point to shutoff shall be at least 10 %; |
The pumps are in parallel operation condition, the following condition shall meet 1. The pump head curves shall be continuously rising to shutoff; 2. Head rise from rated point to shutoff shall be at least 10 %; 3. The head values of the pumps at any given flow within the preferred operating range shall be within 3 % of each other for pumps larger than 3 in. (80 mm) discharge. |
| Note for Pump Parallel Operating Requirement | – | – | The above requirements are not necessary for pumps with individually adjustable speed drives (ASDs) controlled by individual flow measurements. |
Pump End of Curve Flow
In the current edition pump end of flow is defined
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Pump End Of Curve Flow | API 610 11th Ed – Not Applicable
API 610 12th Ed – 6.1.16 |
Pump End of Curve is not clearly defined | The pump “end of curve flow” is defined as 120 % of the BEP flow rate. |
Torsional Analysis
When compare with API 610 11th edition, in the current edition, Torsional analysis for Adjustable speed drives are defined.
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Torsional Analysis | API 610 11th Ed – 6.9.2.2
API 610 12th Ed – 6.9.2.2 |
– | An additional requirement for torsional analysis for machinery train Adjustable Speed Drives (ASDs) rated 1000 kW (1350 hp) or higher. |
Radial Split Casing
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Radial Split Casing | API 610 11th Ed – 6.3.9
API 610 12th Ed – 6.3.12 |
In API 610 11th Edition, the selection of Radial Split pump Casing pumping shall be made if any one of the following operating condition presents 1. Pumping temperature of 400 °F (200 °C) or higher. 2. Pumping liquid with a relative density of less than 0.7 at the specified pumping temperature; 3. Pumping liquid rated discharge pressure above 1450 psi g (10 MPa g, 100 bar g). |
In API 610 12th Edition, the additional Two Points are included along with the points mentioned in the API 610 11th Edition 1. Pumping liquid temperature transients greater than 100 °F (55 °C). 2. Pumping liquid temperature transients that cause casing metal temperature change rates greater than 5 °F (3 °C) per minute. |
Base Plate Design
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Base Plate | API 610 11th Ed – 6.3.9
API 610 12th Ed – 7.4 |
As per API 610 11th Edition the base plate
a. Drain rim surrounding the entire base plate b. Drain pan surrounding the entire base plate. c. Partial drain pan that covers the entire width of the baseplate. The temperature of 400 °F (200 °C) or higher. |
The clear picture of the baseplate is provided in this edition.
a. Flat deck plate b. Sloped full deck plate c. Sloped partial deck plate, d. Open deck version e. Non-grouted Baseplate f. Non-grouted baseplate as in Item e) with a gimbal mount, three-point mount, anti-vibration mount (AVM) spring mount, or other types of mount. Flat Deck Plate
Sloped Full Deck Plate
Sloped Partial Deck Plate
|
Seal Flush Plan mounted on OH2 Pump Baseplates
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Seal Flush Plan mounted on OH2 Pump Baseplates
|
API 610 11th Ed – Not Applicable
API 610 12th Ed – 7.4.6 |
Baseplates for OH2 pumps shall have nothing (auxiliaries or seal flush plan) mounted beside or above the coupling or bearing housing. If the seal flush plan and/or auxiliaries are specified to be mounted on the baseplate, the increased length standard baseplate shall be used and the auxiliaries and/or seal flush plan shall be mounted adjacent to the suction nozzle
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Pump Performance Test
In API 610 12th Edition, 9 points are considered for the performance test, in the earlier edition the number of test point is 6 points.
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Performance Test | API 610 11th Ed – Not Applicable
API 610 12th Ed – 8.3.3.1 |
Not clearly mentioned in API 610 11th Edition | Performance test of pumps shall be in accordance with HI 14.6 or ISO 9906. |
| Performance Test Points | API 610 11th Ed – 8.3.3.3
API 610 12th Ed – 8.3.3.4.1 |
The pump performance test is considered for 6 points
1) Shutoff (no vibration data required), 2) Minimum continuous stable flow (beginning of allowable operating region), 3) Between 95 % and 99 % of rated flow, 4) Between rated flow and 105 % of rated flow, 5) Approximately the best efficiency flow (if rated flow is not within 5 % of best efficiency flowrate), 6) End of allowable operating region. |
The pump performance test is considered 9 points
1) Shutoff (no vibration data required), 2) Flow point at minimum continuous stable flow (beginning of allowable operating region), 3) Flow point at approximately halfway between minimum continuous stable flow and minimum preferred operating flow, 4) Flow point at minimum preferred operating flow, 5) Flow point at approximately halfway between minimum preferred operating flow and rated flow, 6) Flow point between 95 % and 99 % of rated flow, 7) Flow point between rated flow and 105 % of rated flow, 8) Flow point at the end of preferred operating region, 9) Flow point at the end of allowable operating region if different from the end of the preferred operating region. For units with BEP less than 50 GPM (11 m3/h), Point 3 and Point 5 are not required. |
Please find the below performance curve with 9 points
Temperature at Shutoff Condition
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Temperature at Shutoff Condition for High Energy Pumps | API 610 11th Ed – Not Applicable
API 610 12th Ed – 8.3.3.4.2 |
– | In the case of higher energy, integrally geared, or multistage pumps exhibit an increase in temperature at shutoff condition that makes it not feasible to test the Pump at shut off condition. The temperature increase is strictly related to the power density.Power Density (PD) = Prated / Dimp2 x Dnozzle Prated – Rated power per stage in hp (or MW) with water; Dimp – Rated impeller diameter in inches. (or m); Dnozzle – Nominal outlet flange diameter in inches or m. For double-suction, single-stage pumps, Dnozzle is the inlet flange diameter. |
Spare Part Test
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Spare Part Test (Optional Test) | API 610 11th Ed – Not Applicable
API 610 12th Ed – 8.3.4.8 |
– | If it’s agreed between the purchaser and vendor, spare parts such as rotors, couplings, gears, diaphragms, bearings, and seals shall be tested. The vendor shall ensure that the spare parts are available for test at the same time as the original equipment and that all of the necessary components to test them are supplied. The test procedure shall be agreed between purchaser and vendor. |
Pump Cooling Water Schematics
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Annex B – Cooling Water Schematics | – | – | New cooling plan of Plan M, Cooling to Seal Heat Exchanger and Reservoir. Refer below picture for Overhung Pumps & Between Bearing Pump
Overhung Pumps
Between Bearing Pump
|
Standard Base Plate Dimension
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Annex D – Standard Baseplates | – | The baseplate number starts from 0.5 to 12 | Baseplate number starts from 2.5 to 12 |
Material Class
In the current edition, I-1, I-2, S-1 & S-3 material class are removed and corresponding material reference is removed from the “General Design” section.
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Table H.1 – Material Classes | – | – | Material Class I-1, I-2, S-1 & S-3 are removed in the current edition of API 610 11th ED |
Contract documents and engineering design
In the current edition, a detailed list of contract documents and engineering design documents are listed. The document requirements are mutually agreed between the Purchaser and Vendor
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Annex L | – | Vendor drawing and data requirement | A detailed list of contract documents and engineering design data are listed in this annexure |
Special Purpose Centrifugal Pump
In API 610 12th Edition, Special purpose centrifugal pump listed
| Description | Clause Reference | API 610 11th Edition | API 610 12th Edition |
| Annex O | – | API regional Annex | Special-purpose Centrifugal Pumps
The special-purpose centrifugal pump is one that meets one or more of the following criteria: 1. Operating in a severe and critical application 2. Prototype Design 3. High energy levels The design of special-purpose pumps often requires more purchaser and vendor interface than normal pumps described in the body of API 610. The annexure list the recommended discussion points and reviews that are to be mutually agreed by the parties and reflected in the final purchase specification. This annexure covers, the design of Impeller, Shaft, Diffuser or Volute, Shaft seals, Bearing type and bearing housing. |
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