Vertical In-line Pumps

What is an vertical in-line pump?

A type of centrifugal pump that has a vertically oriented shaft, with the suction and discharge connections in the casing in line with each other, rather than requiring a change of direction like end suction pumps. They are commonly used as circulator pumps in situations where water flowing through a piping system needs to be pressurized. Some are designed to be easy to fit into a residential or commercial piping system, and they are commonly used for chilled water and hot water circulation in commercial buildings.

The main advantage of this pump configuration is the floor space savings that this creates, as compared to a horizontal end suction pump. A secondary advantage is that the piping is simplified, since the piping does not have to change direction as it does with an end suction pump. In many commercial building applications, in-line circulators are simply suspended in the piping, just like a valve.

One disadvantage is the weight of the pump and motor is directed to a small concentrated point below the casing, as opposed to horizontal pumps, which have the load of the pump and motor spread across a wider area on the bedplate. Another disadvantage is that any leakage out of the pump seal tends to collect around the top of the casing, where can cause corrosion of the casing, rather than readily draining off as is the case with horizontal end suction pumps.

Different types of vertical inline pumps

Practically any type of pump may serve as an in-line pump, and they can serve all kinds of uses. For example, they may be used as irrigation pumps to help boost water from the well pump or water source to the crops. They may also be used as booster pumps in municipal water supply systems, where they are used to boost the pressure of water from the treatment plant to homes located far from the municipal water supply.

In-line pumps are widely used in homes and commercial building hydronic heating systems, domestic hot water circulating systems, and HVAC chilled water systems. Larger, frame mounted versions of in-line pumps are built to API 610 standards and are commonly found in refineries and other hydrocarbon processing plants.

Vertical In-line Pump Manufacturers
Patterson Pump Company (Pump Manufacturer)

Industrial applications – The Patterson vertical in-line pump (V.I.P) is an economical and an efficient alternative to end suction and horizontal split case pumps. They are ideal in flows less than 2,500 gpm in water resources, industrial and HVAC applications. This pump’s high-efficiency design minimizes energy consumption.

HVAC applications – Patterson’s EnviroFlo™ VIL series pumps are built with annular-pressure-reducing clearance and impeller balance holes to reduce axial thrust. Flow capacities to 10,000 gpm with total head to 400 ft. Case working pressure is 175 psi with 250 psi available on select models. The split coupling design is available in 5 hp or larger, with a double suction impeller on the largest sizes (12 in. and 14 in.).

Fire Suppression applications – Patterson Sentinel™ vertical in-line fire pumps are ideal when you need lower flow ranges. They minimize energy consumption while lengthening service life. These pumps are easy to install with simple mounting requirements. Pressure ratings from 40 to 150 psi (3 to 10 bar) deliver flow ranges of 50 to 1,250 gpm (189 to 4,731 liters/min). Every pump has standard packing and a two-piece gland for durability.

Water applications – The Patterson H2O Works™ vertical in-line pump offers a simple, economical and efficient alternative to end suction and horizontal split case pumps in flows up to 11,000 gpm. The pump is available with either packing or a mechanical seal.

Ruhrpumpen (Pump Manufacturer)

Ruhrpumpen offers several vertical inline pump designs for the process, water, fire service industry and more.

- IIL ANSI vertical inline process pump – The pump has flow capacity to 1,200 GPM, head to 390 ft., and press ranges to 350 psi. The pump meets the ANSI B73.2 requirements and is built for a wide range of process industries, including: chemical, food & beverage, metal, pharmaceutical and more.

- IVP in-line pump – Ruhrpumpen’s IVP pump incorporates a split coupled design and can connect directly to a pipeline to reduce installation and maintenance costs. Capacities to 15,000 gpm and 400 feet of head. The IVP pump is made for several water applications including: fire service, ocean water, ice water, air conditioning and more.

- SPI process pump – The SPI vertical inline process pump is used in several heavy duty process functions in the chemical process, petrochemical, and petrol refining markets. The pump conforms with the API 610 standards and allows for flow ranges from 11 – 2,700 gpm and total head from 52 – 950 ft.

- SPN heavy close coupled – Ruhrpumpen’s SPN vertical inline pump is a single stage, single suction centrifugal pump with close coupled design. The pump has flow capacity to 2,420 gpm and head range to 920 ft.

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