Geotech Bladder Pumps Manuale utente

Rev 02/17/2015 Part # 21150035

Geotech

Bladder Pumps

Installation and Operation Manual

Table of Contents

CHAPTER 1: SYSTEM DESCRIPTION ........................................................................... 2

CHAPTER 2: SYSTEM INSTALLATION ............................................................................ 6

CHAPTER 3: SYSTEM OPERATION................................................................................ 8

CHAPTER 4: SYSTEM MAINTENANCE......................................................................... 11

CHAPTER 5: SYSTEM TROUBLESHOOTING............................................................... 17

CHAPTER 6: SYSTEM SPECIFICATIONS..................................................................... 18

CHAPTER 7: REPLACEMENT PARTS LIST.................................................................. 19

NOTES............................................................................................................................. 27

THE WARRANTY............................................................................................................. 29

NOTE

DOCUMENTATION CONVENTIONS

This document uses the following conventions to present information:

CAUTION

A note icon indicates NOTE information. Notes provide

additional or supplementary information about an activity or

concept.

An exclamation point icon indicates a WARNING of a situation

or condition that could lead to personal injury or death. You

should not proceed until you read and thoroughly understand

the WARNING message.

WARNING

A raised hand icon indicates CAUTION information that relates

to a situation or condition that could lead to equipment

malfunction or damage.You should not proceed until you read

and thoroughly understand the CAUTION message.

Chapter 1: System Description

Function and Theory

Geotech’s pneumatic Bladder Pumps operate with a unique action, ideal for both gentle

low-flow sampling and high flow rate purging. Timed on/off cycles of compressed air

alternately squeeze the flexible bladder to displace water out of the pump to the surface

and then exhaust allowing the pump to refill.

Fluid enters and fills the pump through the fluid inlet check valve at the bottom of the

pump body via hydrostatic pressure. Once fill, compressed air enters the space between

the bladder and the interior of the pump housing, squeezes the bladder, and pushes the

fluid to the surface (see figure 1). Driven by the BP Controller or Geocontrol PRO, this

cycle automatically repeats.

Compressed air does not contact the sample! The bladder prevents contact between the

pump drive air and the sample.

Figure 1 –Bladder Pump Operation

System Components

A Geotech Bladder Pump consists of three main parts (see figure 2):

- The Bladder Cartridge Assembly

- Pump Housing

- Intake Screen

*Optional: Drop Tube Intake Assembly

Bladder Cartridge Assembly

Geotech’s 1.66” (4 cm) Bladder Cartridge Assembly (for 18”/46 cm and 36”/91 cm lengths)

is factory assembled and tested, and is designed to be field replaceable.

The .850” (2 cm) and .675” (1.7 cm) Bladder Cartridge’s are easily replaceable see,

Chapter 4: System Maintenance.

Pump Housing

The bladder pump housing is constructed of electro polished 316 Stainless Steel. The

housing components consist of threaded top and bottom caps, and the housing tube.

Viton O-rings provide the high pressure seals between the end caps and the housing tube.

Intake screen

The intake filter screen is constructed of 316 Stainless Steel and is easily removable for

field maintenance. The intake filter screen is intended to protect and extend the life of the

bladder material (see warranty).

*Optional: Drop Tube Intake Assembly

An optional drop tube can be used to sample from depths below the specified maximum

sampling depth. The drop tube assembly connects a remote intake to the pump through a

tube connected to the pump inlet. The intake depth can be any custom length of tubing.

The pump assembly itself must still be submerged below the water level. This means the

depth to water cannot exceed the maximum pumping depth of the pump.

Be sure to read and understand your portable generator and/or

portable air compressor user manual for proper installation and

operation and Earth grounding instructions. If using portable

compressed gas tanks, be sure to exercise proper caution, use safety

protection devices as outlined by the supplier, and observe any

additional safety requirements mandated by local jurisdiction.

Figure 2 –Basic* Bladder Pump Assembly

*Example above is based on 1.66”/4 cm configuration

Chapter 2: System Installation

The user must determine site specific parameters such as water level, recharge rate and

adherence to low flow purging guidelines.

Pump Tubing Lines

Geotech’s Bladder Pumps are engineered for easy installation and use. Dedicated

Bladder Pumps are available with the tubing attached. Well identifications (supplied by

customer) are located on tags connected to the tubing, and on the tubing bags.

If not pre-attached, upon reaching the well head, connect the air line tubing to air line

connection at the top of the Bladder Pump (see figure 3).

For the 1.66” (4 cm) pumps, the air line is smaller than the discharge line. For the .675"

(1.7 cm) and .850" (2 cm) diameter pumps, both air and discharge lines are the same size.

The letter “A” has been stamped near the air line hose barb on the top of the pump.

Next attach the discharge line to the dischagrge line connection at the top of pump (see

figure 3).

Figure 3 –Pump Head

Failure to attach air and fluid lines to the appropriate ports could

result in damage to the bladder.

Safety Cable

Before deploying any sampling pump, secure a safety cable from an anchoring point at or

near the well head to the top of the pump.

The optional Bladder Pump Hanger is attached to the Quick Link on the safety cable.

Carefully lower the Bladder Pump into the well using the Reverse Coil Method to avoid

kinking, until the desired depth is achieved or until the well cap seats.

Reverse Coil Method

When lowering the pump into the well it is important to reverse the natural bend of the

coiled tubing so that the tubing will straighten out as it is lowered (see figure 4). As the

pump and tubing are lowered into the well, the direction of the bend should be reversed

from the direction in which it is coiled. If the tubing is allowed to uncoil naturally and the

natural bend not interrupted, the tubing will continue its coil into the well. Using the reverse

coil method will avoid hang-ups or difficulty in lowering the pump into the well, especially

when the well is not completely vertical, or has come out of alignment for any reason.

Optional Drop Tube Assembly

If a Drop Tube Intake assembly is employed, a third tubing line is necessary to connect

from the bottom of the bladder pump to the top of the Drop Tube.

For deployment of optional Drop Tube Assembly attach desired length of drop tube to the

intake hose barb and hose barb on bottom of pump. Send the drop tube intake down the

well followed by the drop tube tubing, then the pump and finally the air and fluid discharge

lines.

Figure 4 –Reverse Coil Method

Chapter 3: System Operation

Bladder Pump Operation

Fluid enters the pump through the fluid inlet check valve at the bottom of the pump body

via hydrostatic pressure. The pump MUST be submerged to operate. The bladder then

fills with fluid. Compressed air enters the space between the bladder and the interior of the

pump housing. The intake check valve closes and the discharge check valve (top) opens.

Compressed air squeezes the bladder, pushing the fluid to the surface. The discharge

check valve prevents back flow from the discharge tubing.

Selecting an Air Source

Air consumption depends on the volume of tubing and the size of deployed Bladder Pump.

Follow the general guidelines and examples below to calculate the air consumption for

specific sampling configurations.

Volume of Tubing

TUBING LENGTH

TUBE I.D.

1 ft/

0.3 m

10 ft/

3 m

50 ft/

15 m

100 ft/

30 m

250 ft/

76 m

500 ft/

152 m

0.17 in/

0.43 cm

0.3 in³/

5 cm³

3 in³/

50 cm³

15 in³/

246 cm³

30 in³/

492 cm³

75 in³/

1230 cm³

150 in³/

2460 cm³

0.25 in/

0.64 cm

0.6 in³/

10 cm³

6 in³/

100 cm³

30 in³/

492 cm³

60 in³/

984 cm³

150 in³/

2460 cm³

300 in³/

4920 cm³

Volume of Bladder Pumps

BP DIAMETER

BP LENGTH

VOLUME (in³)

1.66 in/

4 cm

36 in/

91 cm

78 in³/

1278 cm³

1.66 in/

4 cm

18 in/

46 cm

39 in³/

640 cm³

0.85 in/

4 cm

18 in/

46 cm

10 in³/

164 cm³

0.675 in/

4 cm

18 in/

46 cm

6 in³/

100 cm³

Calculation guideline: Volume of Tubing (in³/cm³)

+ Volume of Bladder Pump (in³/ cm³)

= Air Consumption per cycle (in³/ cm³)

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