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ANSI Pumps are regulated centrifugal pumps. Centrifugal pumps are simple in construction and concept. ANSI Stands for American National Standards Institute, and ANSI Pumps are dimensionally regulated pumps. They are supposed to be horizontal, centreline discharge, and end single-stage suction. ANSI centrifugal pumps convert a motor's mechanical energy into kinetic energy. This kinetic energy then turns into potential energy in the format of pumped fluid's pressure which runs on a system curve with varying flow and head.

ANSI pumps vary in dimension and size, regardless of the pump manufacturer. So, ANSI Process Pumps should meet the ANSI / ASME B73.1 standard of the American Society of Mechanical Engineers (ASME). These standards define the recommended practices and guidelines associated with the maintenance of these process pumps. The key focus area of this standard is that the equipment manufactured by all ANSI pump manufacturers should be interchangeable in regards to mounting dimensions, input shafts, discharge nozzles size and location of suction, input shafts, foundation bolt holes, and baseplates. The standard also considers alternate designs should they meet the standard's intent and cover performance and construction-related specifications.

Applications of ANSI Pumps

Oil & Gas refineries, petrochemical, and chemical industries use ANSI chemical pumps. The other areas of application include paper stock, pharmaceutical, ethanol production, food processing, and many other process plants. 

ANSI pumps most frequently get used for pumping thin fluids like alcohol, water, and other less aggressive fluids. ANSI pumps can pump fluids with solids based on the type of impeller. Furthermore, with proper material selection, ANSI pumps can transfer aggressive liquids that are highly corrosive.

Benefits of ANSI pumps

ANSI Pumps are flexible and readily available. They provide a reliable service for numerous applications, but these pumps are the most preferable for chemical processing. They introduce a great degree of ease and flexibility to the operations. 

ANSI pumps are cost-effective and reliable. Plant operators can easily change these pumps without redesigning or changing motor attachment, baseplate dimensions, coupling, or piping. 

• Dimensional interchangeability across brands and manufacturers
• High availability of ANSI parts and pumps
• Higher affordability when compared to API pumps
• With the right sort of impeller, ANSI pumps can pump fluids with solids in suspension

ANSI Pumps from Rotech

Rotech has been an ANSI centrifugal pump manufacturer since . Rotech offers ANSI Frame-Mounted pumps, as well as an innovative close-coupled ANSI pump. We design close coupled process / industrial pumps that meet ANSI ASME B73.1. Our pumps are highly effective and thoroughly tested and is stocked worldwide.

ANSI Frame Mounted Pumps 

1. Series ANSI Pumps are end suction frame mounted centrifugal pumps designed for pumping corrosive fluid handling applications. The pumps have a semi-open impeller, and we have manufactured them for heavy-duty applications.
   
2. LF Series ANSI Pumpsare for Low Flow and High Head applications. They are end suction frame mounted centrifugal pumps designed for pumping corrosive fluid handling applications.
   
3. Series ANSI Self Priming Pumpsare designed with semi-open impellers and used in various heavy-duty industrial applications.
   

ANSI Close Coupled Process/Industrial Pumps 

1. Series ANSI Close Coupled Pumps provides an option for ANSI Frame-mounted pumps. This series uses the same Hydraulic pump casing, impeller, and stuffing box cover of the regular ANSI pump series.
   
2. LF Series Low Flow ANSI Close Coupled Pumps ' coupled with NEMA C Face Electric Motors. This series uses the same Hydraulic pump casing, impeller, and stuffing box cover of the regular ANSI Low flow pump series.
   
3. Series Self Priming ANSI Close Coupled Pumps provide an option for ANSI Self Priming Frame-mounted pumps. This series uses the same Hydraulic pump casing, impeller, and stuffing box cover as the regular ANSI Self-priming pump series.
   

Goto SUNBO PUMP to know more.

Industries such as water, water waste management, oil & gas, petrochemical, and chemical require premium ANSI centrifugal pump manufacturers who come up with equipment that lasts and delivers a high-efficiency service throughout its lifetime. Rotech Pumps & Systems Inc. offers reliable ANSI Process Pumps. The best part of Rotech Pumps & Systems Inc. is that they have an elaborate range of quality pumps in minimum lead times at competitive pricing.

Rotech designs, builds, and tests each ANSI Process Pump according to the International Quality Standard. Their top features include high-strength carbon steel frame adapter material and steel liquid end, upgraded bearing lubrication, and additional casing thickness for a longer bearing life. Moreover, Rotech designs and innovates on all products, and with its factories can beat delivery of other manufacturers.

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Horisontal vs vertical in-line ANSI Pump

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Horisontal vs vertical in-line ANSI Pump

Horisontal vs vertical in-line ANSI Pump

Finego Steel

(visitor)

(OP)

29 Jan 02 23:19

Please advise for the following:
1. what subject I must consider before I make a decision to choose horisontal type or vertical in-line centrifugal ANSI pump for certain application.
2. Is it true that vertical pump is best for low flow and high head application?

Thank you.

RE: Horisontal vs vertical in-line ANSI Pump

tstead

(Nuclear)

30 Jan 02 08:20

Space constraints are more the issue when dealing with horizontal vs. vertical.  Both types of pumps use an impeller inside a casing and work on the same principle of physics - therefore, one will not give you any inherent flow benefits over the other.  While it is true that many multistage pumps are vertical (good low flow/high head conditions) there are also many horizontal multistage pumps.

Clear as mud now?

Tim

RE: Horisontal vs vertical in-line ANSI Pump

butelja

(Mechanical)

30 Jan 02 09:42

For a single stage ANSI B73.1 pump, the hydraulics will be identical as Tim has stated.  Vertical pumps will have a lower installed cost because of the lesser foundation requirements, and they take up a lot less space.  However, from a reliability standpoint, the vertical pumps tend to have higher vibration levels and more seal problems (unless using an expensive double mechanical seal).  Beware that vertical pumps are available either with a rigid coupling and no bearings, so that the impeller is cantilevered off the motor shaft, or with a normal power frame and flexible coupling between motor and pump.  The bearingless type with rigid coupling is cheaper, but far inferior in vibration levels and seal life.  Either type of vertical is hard on seals because of the tendancy for the seal to run in a vapor pocket rather than liquid flooded.

If its not already obvious, I don't like vertical pumps.  From a reliability standpoint, assuming all 3 are installed properly, my preferences would be, in descending order:
1.) Horizontal ANSI
2.) Vertical ANSI w/bearings and flex. coupling
3.) Vertical ANSI w/o bearings and rigid coupling - NOT RECOMMENDED

RE: Horisontal vs vertical in-line ANSI Pump

MJCronin

(Mechanical)

30 Jan 02 12:44

To all,

Butelija is right..... because of maintenance preferences and thepreference for a "good robust installation" the horizontal ANSI B73.1 pumps outsell the vertical by at least 5 to 1.

Don't forget, if the vertical ANSI pump is not properly supported (and many are not) it turns into a maintenance headache. Vibration problems can be transmitted through the attched piping. I have seen vertical ANSI pumps supported only by the conneected piping. Horizontal, baseplate mounteded pumps win hands down.

I have only seen ANSI verticals used where there is a space problem or where the fluid has a high vapor pressure. I have also seen themapplied where a small "booster" pump is needed for more head. Because of the competitive price and the availabilty of parts, many process chemical companies have a policy that says "use ANSI B73.1 hrizontal pumps, unless there is a verified, solid reason not to..."

Anyone else out there in cyberspace have musings or opinions on this ??

DEAN pump is one vendor that I can think of

Cheers....


MJC
 

RE: Horisontal vs vertical in-line ANSI Pump

gunnarhole

(Mechanical)

1 Feb 02 12:35

Hery,

I think the posts above cover your first question pretty well.  As to your question regarding high head/low flow pumps I imagine that someone familiar with Sundyne pumps has started that rumour.  They are excellent pumps in their place but they don't have much in common with an ANSI B73.2 pump.

Regards,

Gunnar

RE: Horisontal vs vertical in-line ANSI Pump

BillBirch

(Mechanical)

4 Feb 02 22:32

Another concern about vertical pumps when hot fluids are being pumped.  The warm air rising from the pump casing detracts from the cooling to the electric motor.

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