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
Datasheet
Bladder Pump
The Solinst Bladder Pump allows consistent, high quality samples in all types of applications. It offers excellent performance and reliability. With Solinst Bladder Pumps there is the assurance that there is no air/water contact during sampling. It meets the most rigorous US EPA standards for VOC groundwater monitoring.
The bladder ensures that drive air or gas does not contact the sample, thus avoiding degassing or contamination of the sample. Solinst Bladder Pumps are rugged and long lasting. PTFE bladders are ideal for dedication, while less expensive polyethylene bladders are available for those that prefer to change bladders after each use. Bladders and intake filters are easily replaced in the field in just a few minutes. No special tools required.
Excellent for either regular flow or low flow sampling, the stainless steel pumps can lift from depths up to 150 m (500 ft) below grade.
Low Flow Purge and Sampling
Low flow sampling offers excellent quality samples by reducing turbulence. It also reduces purge volumes, and thus sampling time and disposal costs. When using a Solinst Model 464 Electronic Pump Control Unit, the Solinst Bladder Pump can be adjusted to provide continuous output of 100 ml/min. or less.
Use of a Flow-Through Cell System during low flow sampling, allows the continuous analysis of purge water, in-line, as it flows, so that sampling can begin as soon as the readings stabilize.
Packers are also available to further reduce purge volumes and to speed sampling times.
Features
Stainless Steel: 1.66" Ø (42 mm) and 1" Ø (25 mm) with 316 stainless steel body.
Non-Vertical Applications: Pumps operate effectively at almost any angle and can be placed under landfills, tailings, storage tanks or contaminant plumes.
Leachate/Product Pumping: Pneumatic drive pumps are well suited for pumping contaminant liquids. Strong solvents and corrosive chemicals can be easily and economically pumped.
Survives Dry Pumping, Dirty Air and Sand: Solinst bladders are not damaged by operation in sediment laden water, or in dry pumping conditions.
Freeze Protection Kit: Optional accessory available to prevent freezing in the sample line.
Benefits
High Quality Samples: Consistently accurate samples with excellent VOC sample integrity.
Simplicity: The controller, air compressor and flow-through cell can be easily transported by one person to any site. Hookup to the pump is by compression fittings.
Cost Savings: Reduced need for repeat sampling and shorter time required for each sampling round. Low purge volumes ensure rapid sampling.
Bladders: Durable PFAS-free PTFE bladders are ideal for dedication. Inexpensive polyethylene is also available.
Operation
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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