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Comparing Iso13709 / Api 610 With Ansi / Asme B73.1 Centrifugal Pumps




Comparing Iso13709 / Api 610 With Ansi / Asme B73.1 Centrifugal Pumps I am not a rotating machinery specialist but a process engineer. Today's blog heading probably has more relevance to a rotating machinery specialist. Nevertheless, I felt that process engineers are also entitled to know the difference between these two distinct categories of centrifugal pumps used worldwide for a majority of pumping applications involving centrifugal pumps.

One of the foremost rotating machinery and reliablity specialist of our times is Heinz P. Bloch with numerous books, articles and research papers on rotating machinery and machine reliability. His fame as a machinery specialist is such that Wikipedia has an article on him. Refer the link below:

http://en.wikipedia..../Heinz_P._Bloch

The comparison that I am providing is referenced from his book "Pump User's Handbook Life Extension" co-authored with Allan R. Budris

ANSI vs API

Compared to an API pump, the typical ANSI pump has the following characteristics:

1. A thinner casing, i.e. less corrosion allowance

2. An ANSI pump has reduced permissible nozzle loads. It is even more sensitive to pipe-induced stresses than the API pump.

3. An ANSI pump has a smaller stuffing box size. Unless a large bore option is chosen, an ANSI pump may not be able to accomodate the optimum mechanical seal for a given service.

4. ANSI pump impellers are designed and manufactured without wear rings. Many ANSI pump impellers are open or semi-open whereas API pumps feature closed impellers with replaceable wear rings.

5. ANSI pumps are generally foot-mounted, whereas the API pump will be centerline mounted. Refer the attached sketch. In foot-mounted pumps casing heat tends to be conducted into the mounting surfaces and thermal growth will be noticeable. It is generlly easier to maintain alignment of API pumps since their supports are surrounded by the typically moderate-temperature ambient environment.

Attached Image

The decision on API vs ANSI construction is experience-based and is not governed by governmental or regulatory agencies. However, experienced machinery specialists have their own likes and dislikes based on the experience gathered by them over their long years in the machinery field.

Many highly experienced and reliability-focused machinery engineers would prefer to use pumps designed and constructed according to API 610 for toxic, flammable, or explosion-proof services at on-site locations in close proximity to furnaces and boilers in some of the conditions (rules-of-thumb) that are listed below:

a. Head exceeds 106.6 m (350 ft)
b. Temperature of pumpage exceeds 149°C (300°F) on pumps with discharge flange sizes larger than 4 inch or 177°C (350°F) on pumps with 4 inch discharge flange size or less.
c. Driver horsepower exceeds 74 kW (100 hp)
d. Suction pressure in excess of 516 kPag (75 psig)
e. Rated flow exceeds flow at best efficiency point (BEP)
f. Pump speed in excess of 3600 rpm.

The author mentions that there have been exceptions made where deviations from the rules-of-thumb were minor, or in situations where the pump manufacturer was able to demonstrate considerable experience with ANSI pumps under the same, or even more adverse conditions.

Finally the author gives his opinion on choosing either API or ANSI pumps based on the following:

Conventional Wisdom: API-compliant pumps are always a better choice than ANSI or ISO pumps

Fact: Unless flammable, toxic or explosion-prone liquids are involved, many carefully selected, properly installed, operated and maintained ANSI or ISO pumps may represent an uncompromising and satisfactory choice.

Hope readers of my blog like this comparison of API & ANSI pumps provided by one of the foremost machinery specialists of our time.

Let me have your comments on this blog entry.

Regards,
Ankur.




Hi Jet1749,

I am interested in receiving a copy of your summary. Will appreciate if you can share the said document to my email ayush842001@gmail.com

thank you in advance for your kind consideration.

Hi Jet1749 or anyone else that has received the summary would it be possible if I could receive a copy too.

 

b16andy@live.com

 

Thanks in advance

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Hammad60302
Jan 05 2015 04:02 AM

I am interested in receiving a copy of your summary. Will appreciate if you can share the said document to my email mh.nrlpak@gmail.com

thank you in advance for your kind consideration.

For anyone interested, I have a copy of a technical summary comparing API610, ANSI B73.1M and ISO 5199 pumps. Also, API 610 8th Edition gave guidelines for the selection of non API 610 compliant pumps (Section 1 - General, paragraph 1.1.4). No doubt the selection of API 610 pumps for all duties in refinery service would likely give an extremely robust pump, but in circumstances where a more lightly constructed pump, in relatively non-hazardous service would suffice, there are massive savings in cost and much reduced lead times for appropriate ANSI/ISO standard pumps

Hi Jet,

i am also interested, plz forward the copy on ayushmittalstudy@gmail.com

thanks

I am interested in receiving a copy of your summary. Would you please send it to me at

venkrishdreamz@gmail.com

I would like to receive a copy of your summary

hgjbaron@gmail.com

Many thanks!

Hi everyone,

 

i am interested in receiving copy of summary comparing API610,B73.1 and iso 5199.

 

hopefully,you can share with me too.

 

hfz_mike@yahoo.com

 

Thank You

Hi, I am interested in receiving copy of technical summary comparing API610,B73.1 and ISO 5199.

Please share with me to email  dina.ismurzina@gmail.com  

 

Thank You 

Dear Jet1749

 

I would like to receive a copy of your comparion.

Would you please mail it to jurabeku@gmail.com?

Thanks in advance!

Hi, I am interested in receiving copy of technical summary comparing API610,B73.1 and ISO 5199.

Please share with me to email tomasmacleod@gmail.com  

 

Thank You 

Dear Everyone,

I am very interested in receiving copy of technical summary comparing API610,B73.1 and ISO 5199.

 

Please share with me to email tamkomering@gmail.com  

 

Thank You Very Much..

i am interested. Kindly share at ayush842001@gmail.com and ayushmittalstudy@gmail.com

Hi,

I appreciate if anyone has the file, please send me a copy.

Email: yaghoubi.hr@gmail.com

thanks

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LooKianSing
Sep 08 2017 04:00 AM

Dear All,

Appreciate if anyone could send me the copy of technical summary comparing API 610, B 73.1 and ISO 5199.

My email address is  kiansing_921126@hotmail.com

Thank you.

Photo
ishu_mech86
Dec 07 2017 11:56 PM

I am interested in receiving a copy of your summary. Will you please send to me at 

 

ishu.mech86@gmail.com

Photo
nitinkavade
Feb 12 2018 01:28 AM

For anyone interested, I have a copy of a technical summary comparing API610, ANSI B73.1M and ISO 5199 pumps. Also, API 610 8th Edition gave guidelines for the selection of non API 610 compliant pumps (Section 1 - General, paragraph 1.1.4). No doubt the selection of API 610 pumps for all duties in refinery service would likely give an extremely robust pump, but in circumstances where a more lightly constructed pump, in relatively non-hazardous service would suffice, there are massive savings in cost and much reduced lead times for appropriate ANSI/ISO standard pumps

Hello Sir, Could you please email me a copy of this comparison at nitin.kavade@ril.com. Thanks in advance.

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