Enhanced Self-Priming Pump

Enhanced Self-Priming Pump
UPM, UPS types (PAT.)

Suction and transfer of liquid containing foam or high viscosity liquid

Patented in Japan, U.S.A., other

Bore	50-250mm
Total head	10-60m
Capacity	0.1-8m³/min

>Selection & Dimensions

The YOKOTA Enhanced Self-Priming Pump is a volute pump with an interlocked water-air separating impeller and a vacuum pump.
The mixture of water and air gathered in the center of the volute pump is centrifugally separated by rotation of the water-air separating impeller and only the air is drawn out by the vacuum pump. Therefore the volute pump always operates under the highest vacuum condition, and shows stable and supreme pumping performance without being blocked by the incoming air or cavitation.
It is probably the only horizontal shaft type volute pump in the world which is capable of continuous suction and transfer of liquids containing high viscosity sediment materials and air (i.e., gas-solid-liquid multiphase flow).

UPM type:	Vacuum pump built-in type
UPS type:	Vacuum pump mounted type
UPS type:	Vacuum pump separate type

Unique features

	Capable of continuous suction and transfer of liquids containing high viscosity sediment materials and air (gas-solid-liquid multiphase flow).
	Universal pump which is also capable of continuous suction and transfer of liquids containing solid, such as food materials, muddy water containing gravel, and sewage containing empty cans.
	Enhanced self-priming type which needs no priming even at initial operation after installation.
	The intake piping can be constructed in many ways such as with waved pipes or across embankments, and so on.
	Due to rational construction, the pump is highly reliable, maintenance is easy, and economical automatic operation is possible.
	A wide variety of materials are available, including FC, SCS and YOKOTA's corrosion and wear resistant special stainless steel casting (YST), to meet the needs of various kinds of liquid.

Principle (PAT.) ............ Try and see its excellent performance.

UPM type
		The water-air separating impeller 1 is installed between the volute pump and the vacuum pump. When operation is started, the main impeller 2 races and the vacuum pump 3 operates, eliminating the air in the suction pipe. When the air is eliminated and a vacuum level close to the suction head is reached, the pumping liquid flows into the pump casing, and is discharged by the main impeller 2. The mixture of water and air in the center is drawn by the vacuum pump 3, goes behind the main impeller and reaches the water-air separating impeller 1. The water-air separating impeller separates the water from the air by centrifugal force. The water returns to the suction mouth through the return passage 4, and only the air gathered in the center is drawn out by the vacuum pump 3. Therefore the volute pump always operates under the highest vacuum condition, and is not blocked by the incoming air at the pump suction mouth or the main impeller.

Applications

Transferring food materials:	Sauce, Soy sauce, Stock, Ketchup, Unrefined sauce, Liquor, Seaweed, Fluid of other raw materials, other
Transferring chemical liquids:	Phosphate slurry, Formalin, Ammonia, Caustic soda, Light oil, Heavy oil, Concentrated sulfuric acid, Ketone, Acrylic ester, Volatile liquids such as ethylene glycol, Gas-containing liquid, Polypropylene powder, Pellets, other
Loading and unloading for tankers:	Aniline, Nitrobenzene, Acetic acid, Nitric acid, other (cargo oil pumps for cargo transfer and stripping for tankers, ballast pumps, bilge pumps)
Sludge drainage:	Sludge, Pulp waste water, Muddy water, Human waste, Pulverized coal sludge, Sewage, other
Earth excavation:	Muddy sand, Seawater, Muddy water containing gravel, other (pumps for reverse circulation, non-clogging dredging pumps, sand pumps)
Sealed (Vacuum) tank extraction:	Pure water, Chemical liquid, other
Defoaming air-containing liquid:	Foam latex liquid, Foam starch liquid, Normal paraffin fermenter liquid, Lubricants, Hydraulic oil, Cutting oil, other
Other:	Hydropower snow transport (For details, please refer to "Current Topics: Snow Removal and Snow Melting".)

Example applications and installations

For transferring food material such as unrefined soy sauce

Overview of the transport test

Results of a comparative test on a diaphragm pump, vacuum tank pumping, and the YOKOTA Enhanced Self-Priming Pump

	The Enhanced Self-Priming Pump is the easiest to operate and is free of problems caused by particles in unrefined soy sauce. It is also trouble-free because the pump itself does not overload.
	It has been recognized that some components in unrefined soy sauce are changed during transport, and the Enhanced Self-Priming Pump and the diaphragm pump have produced the best results in composition tests.
	In soy sauce yield, the Enhanced Self-Priming Pump was the best, followed by the diaphragm pump and the vacuum tank pumping.

(Based on results of a test conducted at a Hiroshima Food Testing Facility)

For loading and unloading chemical liquids for chemical tankers

A chemical cargo pump that is used for loading and unloading chemical liquids is generally equipped on the bottom of the ship, and therefore proves troublesome when cleaning the tank or pump due to its location. With regards to safety, it is far more convenient to locate the pump on the deck of chemical tankers that handle toxic and volatile liquids.
The YOKOTA Enhanced Self-Priming Pump can be installed on the deck with no problems whatsoever. If the pump is equipped on the deck, it is safe and easy to perform the work when dealing with toxic liquids.


Layout with the pump equipped on the deck	The Enhanced Self-Priming Pump in operation

	It can be installed on the deck.
	It can substantially improve the efficiency of loading and unloading work.
	It is safe.
	The sweeping operation can be performed, and suction can be maintained until the bottom of tank is visible.
	Maintenance is easy and economical.

>"Current Topics: Tanker Cargo Handling "

For defoaming lubrication, hydraulic, cutting, and other oils

Removal of air bubbles from lubrication, hydraulic, cutting, and other oils is normally time consuming and costly. However, the YOKOTA Enhanced Self-Priming Pump can perform defoaming work quickly and easily.
The outstanding feature of the Enhanced Self-Priming Pump is a defoaming mechanism that works in unison with the normal pumping operation to provide time and cost savings.

Example of a bearing lubrication circulation pump for hydraulic power generating turbines


Pump discharge side	Comparison of pump suction and discharge sides(Suction side on the right, discharge side on the left)	Enhanced Self-Priming Pump in operation

Bearing lubrication oil for hydraulic power generating turbines is circulated for reuse. The Enhanced Self-Priming Pump provides circulation pressure while also removing air bubbles trapped in the lubrication oil (defoaming). Lubrication oil that enters the suction side of the pump has a large amount of air mixed into it, giving it a cloudy appearance. However, when it is discharged from the pump, defoaming has been performed to completely remove any air bubbles, and the oil becomes transparent as can be seen in the above photos.
This clearly demonstrates the tremendous effectiveness of the Enhanced Self-Priming Pump for maintaining lubrication oil performance.

	Besides lubrication, hydraulic, and cutting oils, the pump can be used for defoaming in a wide variety of areas such as liquid foodstuffs, beverages, chemicals, pulp, and waste liquids.
	Since this pump provides both self-priming and pressurizing capabilities, costs are greatly reduced because all processes, including suction, defoaming, and pressurized transfer of liquid, are provided by this single, compact pump, unlike conventional methods which require installation of several components.

For draining sludge from rainwater settling basins at sewage facilities


		UPS type pump at a sewage-treatment plant

	Good for environmental protection of rivers, and reducing smells emanating from settling basins, other.
	By draining stored septic water in rainwater settling basins into waste water basins, pollution at the sewage facilities can be prevented. Flooding can also be prevented by effectively using rainwater settling basins as rainwater ponds.

>"Current Topics: Sewage Treatment, Water-Purifying Plant"

For pumping out bored earth and sand in the reverse circulation construction method

During underground excavation in the reverse circulation construction method, instead of raising and lowering buckets, boring is continuously done using drill bits, earth and sand are then discharged using circulating water through the drill pipe.
The YOKOTA Enhanced Self-Priming Pump is being widely used as a suction pump to pump out the bored earth and sand.


	Bridge pier construction above river		The Enhanced Self-Priming Pump in operation

	The mud, sand and earth siphoning main pump is connected directly to the vacuum pump to discharge air mixed in the pump. Both are set up on a base plate with all the necessary equipment in a modular design that facilitates transfer to the construction site.
	As for conventional pumping devices used in the past for the reverse circulation construction method, mud, sand and earth penetrating the vacuum pump caused damage or stopped pumping. However, mud, sand and earth do not penetrate the YOKOTA Enhanced Self-Priming Pump due to its built-in water-air separating impeller. As a result, assured, continuous suction operation is possible without breakdown or pump stoppage.
	Its compact size requires half the installation area of conventional reverse circulation construction method pumping devices.

>"Current Topics: Large-Scale Foundation Construction"

Structure

UPM type

Part name		Part name		Part name
`1`	Pump casing	`8`	Bearing bracket	`15`	Discharge valve case
`2`	Partitioning plate	`9`	Gland	`16`	Discharge valve rubber ball
`3`	Rear plate	`10`	Gland packing	`17`	Shaft
`4`	Main impeller	`11`	Air suction and exhaust case	`18`	Air suction valve
`5`	Water-air separating impeller	`12`	Air suction and exhaust valve plate	`19`	Air suction pipe
`6`	Return passage	`13`	Ball bearing	`20`	Pressure pipe
`7`	Stuffing box	`14`	Vacuum pump impeller

Combination with vacuum pump

Enhanced Self-Priming Pump / Vacuum pump built-in type

Vacuum pump built-in type (UPM10-S, UPM10-N)

	The main volute pump and the vacuum pump are installed on the same axis.
	Colorless, odorless, harmless edible oil is used as circulating liquid in the vacuum pump.
	Circulating liquid should be supplemented when it is under the marked level on the level gauge.
	Install a check valve on the discharge pipe to prevent suction of air from the discharge side when the pump is first started. UPM10-0510S is equipped with a discharge ball valve (check valve) as a standard accessory, so the pump can be used by simply connecting hoses.

Enhanced Self-Priming Pump / Vacuum pump mounted/separate types

Vacuum pump mounted/separate types (UPS-N)

	The vacuum pump is separated from the main volute pump (mounted type and separate type).
	Ordinary water (city water and industrial water) can be used as circulating liquid in the vacuum pump.
	Circulating liquid should be supplemented when it is under the marked level on the level gauge.
	Fill with circulating liquid up to the level above the vacuum pump's axis when starting the pump for the first time.
	Install a check valve on the discharge pipe to prevent suction of air from the discharge side when the pump is first started.
	It is possible to change the capacity of the vacuum pump if the pumping liquid contains much air or the intake piping is long.
	Circulating liquid may discharge from the supply tank. This is not a malfunction and is caused by any of the following reasons.
	1.	Too much circulating liquid: Lower it to the level gauge position.
	2.	Circulating liquid is removed by the air: The circulating liquid discharge amount will decrease as the exhaust air amount decreases.