Telephone +86 411 8589 0033. Shafts are designed to be radially split and overhung. What makes it between the bearing pump is that youll have a shaft that has bearing support on both sides of the shaft and then in the middle of that shaft is the impeller. Rigid design for casing cover with strong pressure-loading capacity and reliability. Your size of pump (35 kw), can be big trouble as an overhung unless you know what you are doing and get the right pump. Radial Thrust Not sure what BB Between bearing pumps The impellers of BB pumps are suspended in between the supports. For all pumps of this type, the impeller is placed horizontally, in plane with the bearings. VS Vertically suspended pumps VS pumps are supported above the medium to be pumped. The letters are used to define the main different pump types, where OH stands for Overhung, BB stands for Between-bearings, and VS stands for Vertically Suspended. After-Sales Service +86 411 85890099-8309 +86 411 85890099-8310 Domestic Sales Hotline+86 411 8589 0033-8106. Conversely, if the thrust bearing is placed at the bottom of the machine, a compression force acts along the shaft. There are advantages and disadvantages to both types of pumps. A.Shetty. Impellers on OH pumps are usually offered in three or 4 designs, including: 1. OH pumps take up less floor space and generally cost less than comparable BB pumps. The pump and motor are flexibly coupled and supported by a mounting flange. A large, low rpm, between bearings pump would improve all three of those parameters. What comes to my mind is, Overhung type - Back pullout and monoblock etc., Bearing supported - Split casing and multistage centrifugals etc. Our API 610 type VS4 sump pumps are vertically suspended, radial split, single stage, line-shaft, volute pumps with separate discharge line. In the April issue, we discussed fundamentals of the overhung impeller centrifugal pump design. API610 Family--Overhung Pumps--Between Bearings Pumps--Vertical Pumps API685 Family ASME/ISO Family. API 610 divides centrifugal pumps into three groups: Overhung (OH), Between Bearings (BB) and Vertically Suspended (VS). Double suction 1st stage impeller permits to meet low NPSH requirements, while the closed type impeller with front Hydraulic model provides higher efficiency and anti-cavitation. However, these same principles can also be applied to between bearing style pumps and achieve many of the same benefits. Transition flow passage employs volute space warps design to minimize fluid energy lost. OH An API 610 OH pump is an Overhung pump where the impeller is mounted on the end of a shaft which is overhung from its bearing supports. The VD and VLD Gabbioneta Pumps are vertical multistage, volute type, heavy duty process pumps, available in double- casing or wet pit configuration. Axially split, single or double stages, volute, horizontal between bearing centrifugal pump. I think electricpete is pretty close to the point in his statement - but I would add, that it is usually much cheaper and easier to manufacture a " HTFLO (OH1) API 610 standard. Pump failures and the resulting unplanned downtime can lead to elevated maintenance costs as well as lost revenue from reduced production. If you only need a single stage, there's no need to go to a between bearings pump. Actually, I'm not sure if anyone even still makes between beari These are called out by a set of two letters followed by a single number. Seal chamber suitable to API 682 standard and other kinds of seal. A between bearings pump has the impeller in the center of the shaft between the bearings which are on either end. It could be single stage or multi-stage. It could be single suction or double suction. It could be aligned impellers or opposed impellers. The shaft of a horizontal centrifugal pump is placed horizontally, usually between bearings or suspended. 4. Other rotational speeds are possible with belt and gear driven pumps, etc. So, its no longer an overhung load on the shaft, its actually between the bearing load. Overhung centrifugal pump. Between bearings centrifugal pump. A between bearings centrifugal pump uses one or several impellers installed on a shaft that is suspended at both ends between two bearings. An overhung centrifugal pump uses one impeller installed on a shaft that is suspended at one end by bearings. type of centrifugal pump, the impeller is placed on the shaft, APIFLO-BB1 API 610 standard. Waste-water pump with non-clogging and non-stringing Capacity 70 to 2,000 m/h (308 to 8,820 U.S. gpm) Head 4 to 35 m (13 to 115 ft) Pump details. a shaft which is overhung from its bearing supports. For moderate applications, overhung pumps are the first economical choice. 3 High Suction Specific Speeds Nss > 9000 Based on below chart, centrifugal pumps are classified into three major groups as: Overhung (OH) Between bearings (BB) Vertically suspended (VS) Overhung (OH) It is the simplest group with minimum price and low discharge pressure. 98 posts. thanks all; in equal conditions, when a single stage pump with 35 kW hydraulic power is needed, which is preferred? Does anyone have a simple diagram for Overhung & Between bearing pumps.The API seal plan 11/52 for the overhung type shows one stuffing box and one reservoir for overhung type and two stuffing boxes and reservoirs for overhung type, im having trouble visualizing it. 2. The first thing that comes to mind with bearing assembly retrofits are overhung pumps (API OH2), which are commonplace due to the relatively low cost and ease of implementation. Pumpdesigner, not sure I agree with your thinking I do agree with your statement they have to be built right, but 35 kW isn't that bid a pump, I don't know what drives the design one way or another. In my very very limited knowledge my thought is: If it is a multi-stage pump let's say 5 st Meanwhile, the shaft of a vertical centrifugal pump is vertically oriented. By placing bearings on both sides of the impeller, a better support is achieved. In many cases, the root cause of this issue is hiding in the design of the bearing housing itself. 2 - Pump operates well off BEP for long durations. In an overhung impeller pump, the impeller is installed on the end of a shaft, which overhangs its bearings. In this pump, the impeller is suspended through a single bearing. This configuration facilitates both vertical and horizontal installation of the pump. There is no definite application for an overhung pump (OH) or a between-the-bearings (BB) pump. The common nominal pump rotational speeds for small and medium size pumps are 1,500 and 3,000 r/min at 50 Hz frequency and 1,800 and 3,600 r/min at 60 Hz frequency. ESK Horizontal Single Stage Pump. API 610 divides centrifugal pumps into three groups: Overhung (OH), Between Bearings (BB) and Vertically Suspended (VS). The number is used to differentiate more detailed configuration options within each section. 3. The following section details the various configurations within each category. There are advantages and disadvantages to both types of pumps. Posted 28 October 2008 - 03:40 AM. However, these same principles can also be applied to between bearing style pumps and achieve many of the same benefits. They may be incentivized to offer overhung options in order to be the low cost bid. Douglas Story looks at the design improvements that can be implemented in older between bearing pumps. Overhung vertical pumps supported by a thrust bearing located at the top of the machine are loaded with axial tensile force resulting from gravity loads. Rigid design of shaft ensures stable and reliable operation. OH pumps take up less floor space and generally cost less than comparable BB pumps. The main disadvantage of an overhung pump compared to a between bearings pump, is that the overhung design supports the shaft on only one side of the impeller, whereas the between bearings pump design supports the pump shaft on both sides of the impeller. The first thing that comes to mind with bearing assembly retrofits are overhung pumps (API OH2), which are commonplace due to the relatively low cost and ease of implementation. I must also add my 2 cents worth here as well - 35 kW -some mornings I wouldn't even get out of bed for anything under 100kW. I too have applied en SMI Horizontal Multi Stage Pump. The first thing that comes to mind with bearing assembly retrofits are overhung pumps (API OH2), which are commonplace due to the relatively low cost and ease of implementation. Members. API 610 provides a classification for various types of centrifugal Its advantages are a single bearing housing and a single seal or packing, but an overhung impeller load is a disadvantage. Performance: Q (m3/h) : 10 to 18000 H (m) : ~ 440 P (MPa) : ~ 2.5 The first thing that comes to mind with bearing assembly retrofits are overhung pumps (API OH2), which are commonplace due to the relatively low cost and ease of implementation. The additional mechanical support from the bearings, and the ability to more effectively balance the loads Between Bearings Pumps High hydraulic and bearing body interchangeability, reduced spare parts inventory and shorter lead times Between Bearings Pumps Catalog. However, these same principles can also be applied to between bearing style Impeller Between Bearings Type: The impeller is mounted on a Services & Support. General. The first thing that comes to mind with bearing assembly retrofits are overhung pumps (API OH2), which are commonplace due to the relatively low cost and ease of implementation. There is no definite application for an overhung pump (OH) or a between-the-bearings (BB) pump. However, these same principles can also be applied to between bearing style pumps and achieve many of the same benefits. The first and most obvious difference is the orientation of the shaft. without any doubt, a back pull-out end suction single stage over-hung impeller design is the only way to go. This design is available from hundreds I might go back and request proposals for between bearing double suction based on the NPSH margin (< 5 feet), Suction Specific Speed (>13,000) or Suction Energy (>240 x 10 6 ). However, these same principles can also be applied to between bearing style pumps and achieve many of the same benefits. The following section details the various configurations within each category. Simple Volute overhung is a bearing killer when you pile up the following additive "crimes" 1 - Specific Speed Ns >1800 - 2000 or so. OH. Example: Close Coupled pumps where the impeller is mounted directly on the motor shaft Separately coupled or frame mounted where the impeller is mounted on a separate pump shaft supported by its own bearings. Petrochemical process pump. age, shaft deflection and increased bearing loading. The VD and VLD centrifugal pump series are engineered to minimize NPSHr on high capacity vertical applications. H (m) : ~ 250. The type SMI is a heavy-duty, horizontal, axial split Capacity 50 to 3,000 m/h (220 to 13,209 gpm) Head 200 to 3,000 m (656 to 9,843 ft) Pump details. Performance: Q (m3/h) : 2 ~ 2600.

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