Solinst - Model 407 -Groundwater Sampling Bladder Pump

The Solinst Bladder Pump features a new design providing 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 guarantees that drive air or gas does not contact the sample, thus avoiding degassing or contamination. Solinst Bladder Pumps are rugged and long-lasting. Santoprene® bladders are ideal for dedication, however, the new easy-to-replace bladder cartridges are excellent for those who prefer to change bladders after each use. The bladder and intake filters are simply replaced in the field in just a few minutes—no special tools are 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. The new PVC Bladder Pump operates up to 100 ft (30 m) below grade.

Low flow groundwater sampling offers excellent quality samples by reducing turbulence. It also lowers purge volumes, thus reducing groundwater sampling time and disposal costs.

When using a Solinst 464 Electronic Pump Control Unit, the Solinst Bladder Pump can be adjusted to provide a continuous output of 100 ml/min or less. The use of a Flow-Through Cell System during low flow sampling allows the continuous analysis of purge water in-line as it flows, so groundwater sampling can begin as soon as the readings stabilize.

Packers are also available to further reduce groundwater purge volumes, speed up sampling times, and lower purge water disposal costs.

Santoprene Bladders: Santoprene bladders are used for their chemical resistance, inert properties, making them suitable for harsh environments as well as potable water applications.

Stainless Steel or Low Cost PVC: 1.66" Ø (42 mm) and 1" Ø (25 mm) in 316 stainless steel. 1.66" Ø (42 mm) in PVC.

Non-Vertical Applications: Bladder Pumps operate effectively at almost any angle and can be placed under landfills, tailings, storage tanks or contaminant plumes.

Leachate/Product Pumping: Pneumatic drive Bladder 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 groundwater sampling line.

Bladder: Durable Santoprene bladders are ideal for dedication, however, new bladder cartridges make them extremely easy to replace.

High Quality Samples: Consistently accurate groundwater 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 Bladder Pump is by barb fittings.

Cost and Time Savings: Reduced need for repeat sampling and shorter time required for each sampling round. Low purge volumes ensure rapid sampling. Purged water disposal costs are also decreased.

Solinst Bladder Pumps are manufactured from 316 stainless steel and have PTFE or 316 stainless steel check balls. The bladder is made from durable Santoprene with a Delrin® and acetal copolymer cartridge. The stainless steel Bladder Pump is ideal for most municipal, industrial and general environmental applications, especially where VOC analysis of the groundwater sample is important.

The new PVC Bladder Pump is more suitable for metals analysis and situations with highly corrosive liquids. It has PTFE check balls, a porous polyethylene screen, and a Santoprene bladder with a Delrin and acetal copolymer cartridge. The lower cost PVC Bladder Pump is a perfect choice for situations with a limited budget, but dedicated Bladder Pumps are preferred.

The standard pump body of the 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). Stainless Steel Bladder Pumps are also available in a 1" dia. (25 mm) for narrower applications and use in the Waterloo Multilevel System. (See Model 401 Waterloo Mulilevel System Data Sheet.)

For long-term groundwater monitoring, it is always best to dedicate Bladder Pumps. Dedication avoids cross-contamination and saves time without decontaminating between sampling events. There is also the assurance of no air/water contact during sampling and the confidence that no cross-contamination will occur from using 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 can be easily replaced as needed.

There is an access hole for water level monitoring to fit a Solinst Model 101 Water Level Meter. or Levelogger. An eyebolt is provided for a pump support cable, a Solinst Levelogger suspension line (see Model 3001 Levelogger Data Sheet), or other device.

An advantage of the Bladder Pump is the ability to also use it without a 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).

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) OD dual skip-bonded tubing for ease of operation.

Stainless Steel Bladder Pumps Pumps come complete with a 50 mesh intake filter over the sample inlet, while PVC Bladder Pumps come with a polyethylene screen. These filters are straightforward to replace. If required, Solinst also supplies Model 860 Disposable In-line Filters for use 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) diameter wells. (See Model 800 Low Pressure Packer Data Sheet)

When an Solinst Bladder Pump is lowered into a well, hydrostatic pressure allows formation water to enter the central Santoprene chamber (the bladder) through the inlet filter and fill to a 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 pushing 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 towards the surface.

The pressure/vent cycles are repeated, providing a steady flow of water up the sample line without stripping volatiles from the sample. Due to the low flow rates and gentle pumping action, turbidity is minimized.

Thus, a high-quality VOC groundwater sample is obtained.

When larger groundwater 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 the depth of the pump below the surface, depth below water level, size of the 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.