Difference between revisions of "Afripump / Blue pump"

Revision as of 02:44, 2 February 2013

The Volanta pump with flywheel. Photo: RWSN.

The Volanta pump is easy to maintain. Photo: RWSN.

The Afripump requires less maintenance. Photo: Handpump.org

The Afripump, also called the Blue pump, is an upgrade from the Volanta pump. It no longer has a flywheel, is cheaper, and is said to be more reliable. The Afripump is upgradable to communities with existing Volanta pumps. Below is the story and details of how the Afripump came to be more useful.

First came the Volanta pump

The Volanta Pump, created by Jansen Venneboer B.V., is a reciprocating pump driven by a large flywheel for medium to very deep wells. It uses a retractable cylinder and a seal-less stainless steel piston. A crank and a connecting rod convert the rotary motion into a reciprocating action, which is transmitted to the plunger via stainless steel pump rods. The crankshaft and the flywheel run on ball bearings mounted on a plate that can be fixed to a steel or concrete pedestal. The cylinder is of glass fibre reinforced plastic with a close-fitting seal-less stainless steel plunger. The complete cylinder can be lifted from the well by the threaded pump rods, without removing the PVC-U rising main. The stroke is adjustable to reduce the effort needed at deep installations.

It is designed for heavy-duty use and the maximum recommended lift is 70 m.

The Volanta Pump is not in the public domain and information can be asked from the manufacturer. The Volanta Pump is fully corrosion resistant. It is rather difficult to install and it needs extensive masonry work. Maintenance is easy so that communities can care for the pumps.

The Afripump, a Volanta upgrade

Since the Volanta pump needs some spares every 5 to 10 years (due to the flywheel and the stainless steel T-piece pressure box), and because it is more expensive than other handpumps on the market, Jansen Venneboer B.V. created a the Volanta - Afripump (or in short, the "Afripump"). The major change from the Volanta pump is a handle instead of a flywheel and a simple PVC T-piece inside the blue box, otherwise all components in the borehole are basically the same. These changes greatly reduced the cost of the pump and eliminated the need for spares.

If a community would like to change any existing Volanta into an Afripump, (like when there is no regional support team to change parts of the Volanta every 5 to 10 years), it can simply change the flywheel arrangement to a blue box, since all the inner components are exchangeable. Also any existing Afripump can easily be converted to a Volanta.

The key success of the Afripump is its simple and strong construction and the fact that it needs no spare parts due to a new pumping concept.

Why the Afripump won't breakdown

When other handpumps break, it is often due to broken rods and broken pipes, leaking pipes, faulty piston rubbers seals, leaking footvalves or wrongly installed footvalves, etc. With the Afripump all this will not happen: i.e. the pump will not stop working due to wearing out or broken spare parts, simply because:

• The stainless steel rods have rolled threaded connections which don't brake,
• The heavy duty strong bearings are maintence free, lifetime 25+ years,
• The rising main is made from quality BOODE PVC pipes and don't break,
• For deep water levels the Afripump has a bottom support system,
• The piston has no rubber seal and is 100 % maintenance free.

Optional for the deep water levels is an extendable handle with a massif counter weight to compensate for the extra weight of the water and rods in the rising main. Therefore pumping remains easy, also for children, even at 80 m deep.

Suitable conditions

Distribution: Mainly in West African countries.
Some users find it difficult to start the pump. Small children have to stay away from this pump, because the area of the rotating flywheel can be a dangerous playground.

Construction, operations and maintenance

Pump stand & flywheel are made of painted Mild Steel, the rising main consists of PVC-U pipes, the cylinder is made of glass fibre reinforced epoxy resin, plunger & the pump rods are of Stainless Steel and the valves of rubber. The pump is corrosion resistant.

The Volanta Pump is a protected product and is not intended for local manufacturing. However, there are countries where pumps are assembled and installed locally.

The installation of the Volanta Pump is rather difficult but does not need any lifting equipment. However, extensive masonry work is required and skilled installation crews are important.

This pump has a good “Community Management Potential”. Simple tools are needed to pull out the pumping element, including pump rod and foot valve. The seal-less piston means that no regular replacement of worn rubber seals is required.

Afripump

The Afripump tools needed to install and maintain it. Photo: Handpump.org

Installation of the Afripump is easy and can be done by one technical person and one assistant. The Afripump comes standard with strong 70/80 m PVC rising mains and 9 mm stainless steel rods with threaded connections (Volanta technology). For the installations, no special tools or tripod is required, only keys nr 24 and 17 are needed to complete the installation. When the concrete base and drainage platform is ready, the metal stand is fixed on 4 anchor bolts and the pipes are glued and lowered into the borehole casing up to the desired depth. The handle is fitted to the base with 4 M16 bolts. The cilinder is lowered with the rods and the last rod is attached to the handle. The cover is put on and the pump is ready to use.

Based on the experience with the Volanta handpump, the maintenance of the Afripump is limited to cleaning of the pump and platform, checking and occasionally tightening of some nuts & bolts, maybe applying paint from time to time, all other parts are maintenance free.

The Afripump is also 100 % VLOM (Village Level Operated & Maintained) because the few simple activities can be done by a local caretaker with local available materials and require no special tools, equipment or training.

Costs

Studies show that families in rural communities will agree to pay 1 to 3 US$ per month for a reliable water supply, especially when there are no alternative nearby water souces availabale. One handpump can serve 25 to 50 families that need 125 to 250 buckets of 20 litres/day, which equals 3 to 6 hours of pumping. This is enough to pay 25 to 50 US$ per month for the supervisor, the remaining revenues are sufficient to pay back the loan fully in 3 to 5 years.

Manuals, videos, and links

• Jansen Venneboer: Volanta Pump (in Dutch). Jansen-venneboer.com
• The Volanta Pump. Handpump.org
• Volanta pump. Practica Foundation
• New name for the Afripump: BluePump - BluePump by Fairwater. The main distributor of the BluePump is Boode waterwell systems.

Acknowledgements

• Implementation • Handpump Technology Volanta. RWSN.
• The Afripump. Handpump.org