6.3 Attaching a Pump (Bladder or Double Valve)

Tools and accessories required: tubing cutter, Oetiker pliers, Oetiker clamps, sand paper, 4" (10 cm) of 1/2"OD x 3/8"ID tubing, black electrical tape, rod/broom handle.


Figure 6-10 Tools and Accessories Required


There are two stems on each pump. The shorter stem is the sample stem, which the sample line (white/natural) will be connected to. The longer stem is the drive gas stem, which the drive line will be connected to. Depending on whether you use LDPE or Teflon-lined, the drive line may be red colored or white/natural, respectively.


Figure 6-11 5/8"x6" Double Valve Pump


Beginning with the deepest Port (Port 1), stand at the borehole holding the spool of tubing. A broom handle or equivalent pole works well to hold the spool.

Identify/label the end of this tubing by wrapping a 1" (25 mm) piece of black electrical tape around the tubing to form a 'black band'. Let each band represent the Port number. Here, one band of the tape on the tubing end will represent that this tubing will be connected to Port 1. If using Teflon tubing, use a different colour tape to represent the drive line tubing.

A second person will 'walk' the end of the labelled tubing to the measured reference mark. Once the tubing end is pulled to this reference mark. Cut the tubing at the spool.

At the next Port, roll off the tubing to the end of the previous cut tubing length, and cut at this reference mark. Use this reference for the remaining Ports, so as more Ports are added, the tubing and cable ends will meet at the same point. Remember to label each length of tubing as you progress.



Use the black tape to wrap the number of bands corresponding to the Port number around the tubing end (i.e. 1 band of black tape represents Port 1).


Make a clean fresh cut to both tubing ends at the borehole. Place one small double ear Oetiker clamp over each pump stem. Wrap a small piece of sandpaper around the tubing for 'traction' and push the sample tubing over the shorter pump stem. Use the sandpaper to help push the drive tubing over the longer pump stem. If you are using Teflon-lined tubing, be sure to check that the Teflon lining has not become separated from the tubing while pushing it onto the pump stem. If you see a 'bubble' through the tubing, pull it off the stem, make a fresh cut, and restart this step.



If you are using Teflon-lined tubing, be careful not to allow the Teflon lining to become separated and cause a visible 'bubble' at the Port Stem.


Figure 6-12 Using Sand Paper to Push Tubing onto Pump Stem


Using the Oetiker pliers, incrementally crimp both ears on each clamp. Alternate from one ear to the other, slowly pinching the ears closed. Repeat this cycle 2 or 3 times to achieve a proper crimp. Once the clamp is closed properly you should not be able to see light through the ears of the clamp.

Cut a piece of 1/2"OD x 3/8"ID tubing about 4" (100 mm) long. Push this onto the Port Stem by about 2" (50 mm). Using the Oetiker pliers, crimp a #14 Oetiker clamp over the tubing, attaching it to the Port Stem.


Figure 6-13 Tubing Attached to Port Stem


Place another #14 Oetiker clamp over the open 1/2"OD x 3/8"ID tubing end. Push the pump intake into the tubing end. You will notice that the pump intake is recessed to receive the Oetiker clamp. Crimp the clamp to the pump.


Figure 6-14 Pump Connected to Port Stem