Well point installation equipment

The wellpoint and riser are metal and therefore are rigid, with the wellpoints connected to the bottom of the riser pipe. The wellpoint and riser are installed using high-pressure water supplied to the top of the riser pipe from a clean water jetting pump. Near the lower end of the shoe a horizontal pin is located; above the pin is a lightweight, loose fitting ball.

When the water pressure is applied to install the wellpoint, the ball is displaced downwards to allow the passage of the high-pressure water flow, but the pin retains the ball within the jetting shoe.

When the pumping starts, the applied vacuum sucks the ball up onto a shaped spherical stating and thereby seals the lower end of the wellpoint.

The unperforated riser should extend to near the lower end of the wellpoint screen to minimize the potential for air intake at maximum draw down. While the self-jetting wellpoint can be subsequently extracted for reuse, it is not uncommon for the riser pipes to be damaged during extraction and so need straightening or even replacement before reuse.

They are installed by means of a placing tube or hole puncher using similar high-pressure water jetting techniques for installation as for the self-jetting wellpoint. The latter forms a good filter and in conjunction with the normal sanding-in is very effective, even in difficult silty soils. As with the self-jetting wellpoint, the riser typically made of uPVC ducting should extend to near the bottom of the screened length.

The disposable wellpoints are not recoverable, but some of the plastic riser pipes can sometimes be recovered for future reuse. Self-jetting wellpoints and placing tubes used with disposable wellpoints are installed using high pressure jetting pumps.

Sharp gravel is nearly impossible to drive a well point through since it will tear the screens. The chart on the right shows the difference between the size of coarse sand and fine sand. A wash down valve may have to be used for certain particles. For more on wash down valves, check out our blog Well Points: What are They?

When trying to find a location to drive the well point, it is important to keep in mind any other sources of contamination that could be located near by. The well should also be on a higher part of ground. Steer clear of a location near any marshy areas or septic tanks that could cause contamination to the water. If there is a sewer line close by, it is important to stay at least 50 feet away.

You should also check with your utility company to ensure that you don't start the well on top of underground service lines. Check with your local building department before you start construction, many areas require a permit or some authorities have laws that prohibit wells. Wellpoint Mop Part Mops are used for removing stubborn surface water from a dewatering site.

The 20 ft. Mop head can be moved to the lowest point to remove surface water down to within one inch of the mop base. Includes ball valve to fine tune system depending on water level. Heavy duty steel to withstand most construction site abuse. Wellpoint Strainer Part Strainers can be used at the lowest point in an excavation to create a sump pit and remove unwanted water.

Dig a hole approx. Strainers are made of durable steel to withstand most construction site abuse. Header Support Part Designed simply to make the header line self-supporting by utilizing the strength of the riser pipes, a safety precaution in sheer cut area and valleys.

Wellpoint Clay. Seals small leaks in the wellpoint system, header pipe, swings, pumps, etc. Jet Rod. Jet Rods makes jetting in a point simple. The rod and fittings are aluminum to cut down on weight and make handling easier. Jet Rod is 2-pieces to allow breakdown for easy transport and storage. Steel turbo tip blasts material out of the way for fast jetting and less wear.

Part — Sand Casing. Then jetting bend with hose is removed, and the filter is inserted into the jetting pipe. Finally jetting pipe is removed from the ground and filter remains here, ready to be connecte to the suction header pipe.

Some accessoies for jetting : [1] jetting pipe D51, [2] jetting pipe D , [3] jetting hose, 4] bend for jetting hose. Dependig on the ground type, jetting pipe diameter, and wellpoint type, for the jetting can be used the pumps with ability of producing water pressure between bars.

Particularly in Poland, most of our jobs, are done with 5 bar pumps.