Spear points are- A type of bore used in shallow generally unconfined aquifers.
Shallow installations usually reaching no more than 6 meters in depth, these installations are usually for delivering low quantities of water. They amount of water usually obtained is only for watering a garden, Holiday or a small house.
They are formed by different methods some of these are
1: Drilling a hole by machine or hand and installing casing and screen, in this method the ground conditions must support the hole opening or it will collapse.
2: By hammering your casing and screen directly into the ground using a machine or a sledge hammer. If using PVC then a drive cap must be fitted to the top and this cap is used to take the hammer blows so as not to split the casing r screen.
3: Jetting, this can be done by using an Air compressor or a high pressure water supply.
A jet of water is pushed through an orifice in the pointed spear and as the water is coming through the spear point the bore casing is pushed down as the water pushes the sand in front of the screen away, this goes on until the screen is at its desired depth.
Sand spears are often called by many different names below are some of the other names used.
Jetting Spear.
Sand spear
Drive spear. Drive point.
Wire wrap well screen.
Lowering spear.
Jet spear.
Spear Head
Standard slot sizes are 0.15mm to 0.4mm wide depending on the size of the sand.
The more sand that enters your screen and pass ‘s through your pump the quicker the pump will be destroyed.
Advantages of Stainless steel V- wire over PVC.
V-wire or wedge tapered screens are an advantage due to their design. With the taper design being wider in the inside than the outer produces a non plugging opening. This then gives sand only two points of contact to retain sand granules giving less chances of blocking.
Advantages
A PVC sand spear which uses a straight slotting pattern, does not allow sand grains to pass through as easily and may block quicker than the v-wire screen, it will also have a lower efficiency and less of an open area. This type of screen is used more regularly used due to its cost and performance of a satisfactory nature. In the 15 years plus of manufacturing this type of PVC screen we have never had or heard of a blocked screen.
In summary for a high yield and quality screen Stainless v-wire would be used and if a low yield and cost savings are wanted then a DEPS PVC sand spear would be used.
Advantages
Stainless Sand Spear
This picture shows the construction of the stainless screen and the design to stop the screen from clogging with using the wedge shape and why these types of screen are so efficient.
FAQ
A standard system can give you a minimum of 6 L/M
It also depends on the area were you place your screen, Fraser Island you could expect 600 GPH or 44.5 Liters per Hr. these screens have been delivered up to 1200 GPH ( 89 LPM)
This depends on what depth the water table is but usually the idea is to set the bottom of the spear to 2-3M from the water table.
Many people install these systems themselves by following a simple procedure and a few tools these can be installed in a quick time, but again depending on the depth and soil conditions. For a installation guide contact us on below and we will be happy to send you more information.
Every state has their own rules and regulations, even some parts in a state will have their own regional rules, places such as Fraser Island in Australia. Many states allow you to install a bore to a maximum of 3m before a bore license is needed. So before you start check your local water authority that control ground water licenses.
Prices vary depending on what type of spear you need, the length of the screen and material used. But prices would be approximately $100 to $550
There are three methods one is Jetting- washing the screen in using high pressure water or air.
The second is to drive the screen into the ground using some type of force. Third -bailing the screen in. To understand this more contact us and we will be happy to send you more information.
To remove water from the screen there can be a few different methods some of these are the following.
1: Use a small bailer.
2: use a hand pump.
3: Connect a Std. small House hold pump..
4: A 12 volt submersible pump that fits inside the spear.
Before drinking you should have the water checked by a qualified tester, but if a distance away from this, then use a small taste test and smell test. Check to make sure there is no septic or toilet systems close by that could contaminant the water, look around in the close proximity and see if there is any unusual effects on the habitat around.
Part Numbers for your Order
| SS01-********** | |
| SS01-32SASP600BS | 32MMs/s SAND SPEAR*600MM BSP F |
| SS01-50SASP600BS | 50MMs/s SAND SPEAR*600MM BSP F |
| SS01-32SASP900BS | 32MMs/s SAND SPEAR*900MM BSP F |
| SS01-50SASP900BS | 50MMs/s SAND SPEAR*900MM BSP F |
| SS03-************ | S/S SAND SPEARS WITH WASH DOWN VALVE |
| SS03-32SASP600BSWD | 32 WASH SAND SPEAR*600MM BSP F |
| SS03-50SASP600BSWD | 50 WASH SAND SPEAR*600MM BSP F |
| SS03-32SASP900BSWD | 32 WASH SAND SPEAR*900MM BSP F |
| SS03-50SASP900BSWD | 50 WASH SAND SPEAR*900MM BSP F |
| SS10-********** | PVC 50MM SAND SPEAR SCREENS |
| SS10-50MMSP1000TEE | 50MM PVC SPEAR*1000MM BSP ST |
| SS10-100MMSP1000TEE | 100MM PVC SPEAR*1000MM BSP ST |
| SS12-********** | PVC SAND SPEARS WITH WASH DOWN VALVE |
| SS12-50MMSP1000TEE | 50MM PVC SPEAR*1000MM BSP TEE |
| SS12-50MMSP1000ST | 50MM PVC SPEAR*1000MM BSP STR |
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