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Stainless steel Model 407 Bladder Pumps provide consistent, accurate, reliable groundwater samples in all applications. Ensuring no air/water contact during operation, pumps are ideal for VOC sampling. PTFE bladders are ideal for dedication. Inexpensive polyethylene bladders are also available. Stainless steel pumps are effective at any angle, to depths of 500 ft (150 m), and are ideal for low flow sampling.
High Quality Pumps Providing Representative Samples
- Ideal for VOC groundwater sampling
- Excellent for low flow purge and sampling
- High quality stainless steel design
- Durable PTFE bladder
- Optional disposable LDPE bladders
- Portable or dedicated
The Solinst Bladder Pump
Solinst Bladder Pumps are manufactured from 316 stainless steel and have PTFE check balls. The bladder most frequently used is PTFE, however polyethylene bladders are also available. This is the ideal sampling pump for most types of municipal, industrial and general environmental applications, especially where VOC analysis of the sample is important.
The pump body of the standard Solinst Bladder Pump is a convenient 1.66″ dia. (42 mm) and comes in lengths of 2 ft and 4 ft (0.6 m and 1.2 m). 1″ dia. (25 mm) bladder pumps are also available for narrower applications and for use in the Waterloo Multilevel System. (See Model 401 Waterloo Mulilevel System Data Sheet.)
Solinst Bladder Pumps available in Stainless Steel 1″ and 1.66″ (25 mm and 42 mm).
Portable Bladder Pumps
For less frequent sampling, and to allow access to multiple monitoring wells, even in remote locations, portable bladder pump systems are available.
They are supplied on a free-standing reel. The rugged systems are very convenient and easy to transport. Tubing fittings on the reels and controller are compression fittings, allowing quick set up in the field. The Solinst Model 103 Tag Line can be used to lower and support the pump in the well (See Model 103 Tag Line Data Sheet).
1″ (25 mm) Stainless Steel Bladder Pump on Free-standing Reel
Converts Easily to Pneumatic DVP (Double Valve Pump)
The 1.66″ dia. (42 mm) by 2 ft (0.6 m) Stainless Steel Bladder Pump (42 x 610 mm) utilizes most of the same parts as the pneumatic drive Solinst 1.66” Double Valve Pump (DVP). The DVP can operate from greater depths and provide higher flow rates. Conversion from a Solinst Bladder Pump to a DVP and back again is quick and easy (approx. 2 min.) and requires no tools.
Sampling with a Dedicated Bladder Pump using Portable, Rugged, Easy-to-use, Compressor and Controller
Dedicated Systems
For long term monitoring it is always best to dedicate Bladder Pumps. This avoids cross-contamination and saves time without the need to decontaminate between sampling events. There is the assurance of no air/water contact during sampling, and the confidence that no cross-contamination will occur from the use of portable equipment.
Solinst well caps are designed for ease of use. The vented caps have a quick-connect attachment for the controller unit/air supply. Fittings are provided for both 1/4″ OD (6 mm) and 3/8″ OD (9 mm) tubing. Each cap comes with a 3 ft (0.9 m) length of discharge line, which is easily replaced, as required.
For water level monitoring there is an access hole to fit a Solinst Model 101 Water Level Meter. or Levelogger. An eyebolt is provided for a pump support cable or for suspension of a Solinst Levelogger, (see Model 3001 Data Sheet) or other device.
Dedicated Well Caps
The caps slip easily onto 2″ dia. (50 mm) wells. Adaptors to fit 4″ dia. (100 mm) wells are also available. They have quickconnect fittings for the drive and sample tubing.
Well Caps for Dedicated Pumps
Use Without the Bladder
An advantage of the Bladder Pump is the ability to also be able to use it with no bladder. This allows you to continue sampling if you are in the field with no bladder replacements. Simply operate it like a Double Valve Pump (DVP).
Pump Controllers
Model 464 Electronic Control Unit
(125 psi and 250 psi Models)
The Model 464 Electronic Pump Control Unit is available in 125 psi or 250 psi versions, and uses 4 AA alkaline batteries that last up to 100 hours of normal use. These Controllers can also be operated manually if your batteries run out in the field, using only a compressed gas source. It has automatic preset sample modes from low through high flow settings. In addition, up to 99 user-created flow rates can be saved in FRAM memory. The Controller allows faster purge rates and precise low flow control to ensure a representative sample at 100 ml/min or less when sampling for VOCs.
These convenient Controllers are rugged, dependable and suitable for all environments. Quick-connect fittings allow instant attachment to dedicated well caps, portable reel units and to an air compressor or compressed gas source.
12V Oil-Less Air Compressor
12 Volt Compressor
The Solinst 12 Volt Compressor is lightweight 21 lbs (9.5 kg), compact, and ideal for field use, especially low flow applications of less than 30 m (100 ft) depths.
The compressor operates using 12 volt DC power source, such as a car or truck vehicle battery, and comes with alligator clips. The compressor operates at up to 125 psi and is equipped with a 2 US gallon (7.6 L) air tank which is rated to 150 psi.
Easy Decon or Disposable Polyethylene
Solinst Bladder Pumps are easy to decontaminate. Everything is very accessible. The tubing may simply be flushed or it is easily replaced.
The pump is quick to disassemble and the bladders and screens are simple to replace in the field. No tools required. Inexpensive polyethylene bladders can be quickly replaced to suit regulatory requirements.
Tubing
The standard tubing is 1/4″ (6 mm) single line or 1/4″ (6 mm) OD dual skip-bonded LDPE. PTFE-lined LDPE and other tubing sizes are also available.
Solinst provides dedicated systems with individual drive and sample lines so that the cost of replacing the sample line is minimized. Portable systems are provided with 1/4″ (6 mm) dual skip-bonded tubing for ease of operation.
Filters and Packers
Stainless Steel Bladder Pumps come complete with a 50 mesh intake filter over the sample inlet. These filters are very easy to replace. If required, Solinst also supplies Model 860 Disposable In-line Filters which are used on the sample discharge tube. They are adaptable to fit many sizes of tubing. (See Model 860 Disposable In-line Filter Data Sheet)
Model 800 Low-Pressure Packers can be used with Solinst Bladder Pumps to minimize purge times by reducing purge volumes. This reduces the cost of water disposal and labour. Packers are available in single point or straddle packer designs, and in sizes to fit 2″ (50 mm) to 5″ (127 mm) dia. wells.
(See Model 800 Low Pressure Packer Data Sheet)
Model 800 Packers 3.9″ and 1.8″ (99 mm and 46 mm)
Bladder Pump Operation
When an Solinst Bladder Pump is lowered into a well, hydrostatic pressure allows formation water to enter the central PTFE chamber (the bladder) through the inlet filter, and fill to static level.
When compressed air or gas is applied to the drive line it pressurizes the space around the bladder, causing it to collapse and pushes the water up into the sample line.
Check valves ensure that no water flows back down through the pump or into the formation.
When compressed air or gas is vented (released), more formation water enters the bladder. When the pressure is reapplied, the fresh formation water is pushed up towards the surface.
The pressure/vent cycles are repeated, providing a steady flow of water up the sample line without any stripping of volatiles from the sample. Turbidity is minimized due to the low flow rates and the gentle pumping action.
Thus a high quality VOC groundwater sample is obtained.
Higher Flow Rates
When larger purge volumes are required, Solinst Bladder Pumps can deliver flow rates up to 1.5 L/min.
Alternatively, a Solinst Stainless Steel Double Valve Pump (DVP) is an option. These pneumatic drive DVPs can provide higher flow rates and sample from greater depths than most bladder pumps.
Flow rates vary with depth of pump below surface, depth below water level, size of drive and sample tubing, drive and vent cycle times, gas pressure applied and aquifer recharge.
Flow rates of the Solinst Bladder Pump and the Double Valve Pump compare favourably with published data for similar types and sizes of pumps, under similar conditions.
For example:
1.66″ x 2 ft (42 mm x 610 mm) Bladder Pump at 100 psi, with 1/4″ OD drive line and 3/8″ OD sample line; 50 ft (15 m) below grade with 25 ft (7.5 m) below water level gives 1.5 L/min.
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