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Codip Air Operated PTFE Tubular Diaphragm Pumps
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Codip pumps are positive displacement pumps and combine an innovative pump design with a robust construction using durable materials.The result is a pump providing safe and reliable liquid transfer even when handling the most aggressive media. These tubular diaphragm pumps resist the effects of viscous, abrasive and corrosive fluids.
Codip manufacture the only range of air operated pumps with PTFE tubular diaphragms, a unique construction compared with conventional AOD pumps.
The Codip pump range consists of five models and covers nominal flow rates from 20 litres/min to 300 litres/min at discharge pressures up to 10 bar. The standard pumps can operate at temperature up to 90 deg C and, with simple modifications, can pump liquids at temperatures up to 180 deg C.
Various wetted materials of construction are available including pure PTFE, Viton, Hypalon, EPDM and Neoprene.
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- Maximum flow rates
from 20 lit/min to 300
lit/min at discharge
pressures up to 10
Bar
- Pure PTFE wetted
construction
available for ultrapure
pharmaceutical
applications or for
maximum corrosion
resistance
- Codip pumps can be
run dry, are self priming
and offer
double containment
as standard
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Codip pumps can dry suction lift from 1 m (model RP 20) to 4 m (model RP 150) with standard ball check valves.
An option of PTFE shuttle check valves ensures positive seating and achieves higher suction lifts between 3.5 m (model RP 20) and 5 m (model RP 60 Duplex) based on water at 18 deg C .
| Operational Features
The Codip pump is operated by compressed air supplied through an independent automatic air distributor to one side of a flat rubber air-diaphragm. This diaphragm is deflected and displaces the inert liquid inside the pump casing. In turn, the inert liquid transmits the pressure uniformly to the PTFE tubular diaphragm without any mechanical stress.
The rubber air-diaphragm therefore operates with air pressure on one side, and an equal and opposite fluid pressure on the other side, so this diaphragm is hydro-dynamically balanced.
Similarly, the tubular diaphragm (which is 'the heart' of the system) operates with the process medium inside, and inert liquid outside, at the same internal and external pressure so this diaphragm is also hydro-dynamically balanced. This means that the differential pressure acting on the tubular diaphragm walls is always zero, therefore eliminating any diaphragm stress and resulting in an extremely long tubular diaphragm life.
In the Codip pumps with PTFE wetted parts, all component parts that come into contact with the pumped medium are isostatically moulded from pure virgin PTFE. The pump has no mechanical seal, packing or O rings that seal the pumped liquid from the environment, and it is therefore virtually impossible for the Codip pump to leak any pumped liquid into the environment.
The fact that the pump has secondary containment is another important feature of the Codip design which addresses the growing demand for sealless pumps and ensures zero leakage even in the unlikely event a diaphragm failure.
The PTFE tubular diaphagm safely handles most corrosive liquids, both hot and cold.
Technical Features
- Pure (virgin) hydrostatically pressed PTFE wetted parts, fully guaranteed against permeation, for all corrosive chemicals and blends
- 10 bar maximum discharge pressure
- Temperature range from 20 deg C up to 180 deg C
- Material options include Viton®, Hypalon®, EPDM or Neoprene for extremely abrasive and/or corrosive liquids
- Dry self-priming, can run dry without damage
- Dead heading without damage
- Sealless double containment configuration prevents any leakage of process fluid into the atmosphere
- Optional electronic or electro-pneumatic leak detection system (IP55 or explosion proof zone 1 and zone 0)
- Unique elastomeric air membrane elminates complex hydraulic systems
- External air distributor for easy access. Lubrication-free, non-freezing
- Integrated stroke frequency controller independent of air pressure or discharge pressure
- Optional remote and/or metering control (pneumatic, electric or electro-pneumatic)
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Model Selection and Specifications
| Model |
Flow Rate(1)
(l/min) |
Flanges(2)
(mm) |
Suction Heads(3)
(bar) |
Discharge Heads
(bar) |
| RP20 |
20 |
25 |
0.35 |
10 |
| RP60 |
60 |
50 |
0.5 |
10 |
| RP 60 Duplex |
120 |
50+50 |
0.6 |
10 |
| RP150 |
150 |
80 |
0.4 |
10 |
| RP 150 Duplex |
300 |
80+80 |
0.5 |
10 |
Notes:
- The above mentioned capacities are based on 18 deg C water and a driving-air pressure of 3 bar, with 10 m.l.c. discharge head and 1 metre negative suction head. The effective flow rate of any given system depends on both the nature of the pumped fluid (viscosity-density-vapour pressure) and most important the layout of the suction piping (geometric pumped height-size-length volume and friction losses, etc.)
- Flanges are normally DIN 2532 ND 10 or ANSI 150 lbs. Other standards can be supplied.
- The above data is obtained under self-priming conditions with PTFE 'shuttle' valves for the RP 20 model and for RP 60 Simplex and Duplex models, with standard PTFE ball check valves for RP 150 Simplex and Duplex models.
- Duplex pumps are normally supplied without inlet and outlet manifolds. These manifolds can be supplied if required but normally it is more efficient to include them into the piping scope.
Special Assemblies
SD Range
- The SD design of Codip pumps are suitable for process liquids containing solids where PTFE wetted parts are required.
- The special PTFE tubular diaphragm is designed for slurries and liquids containing solids and does not incorporate any spacers hence reducing the number of flow restrictions in the pump.
- Glass filled PTFE balls and seats are used in the SD design to minimise the effects of abrasion while offering the maximum resistance to corrosion.
- Liquids with up to 50% solid concentration with particles up to 7 mm can be successfully pumped with the Codip SD Range.
SH Range
- THE SH range incorporate PTFE shuttle check valves which are more efficient than standard ball check valves.
- This allows better seating of the valves and so improves the efficiency of the pump and reduces the chance of the pump losing prime.
- By using PTFE shuttle valves, the dry lift capability of the Codip models increase to 3.5 metres for the model RP20 and 6 metres for the model RP60 Duplex.
- The check valves are designed to minimise friction losses and so wear on the PTFE balls and seats is minimised.
HC Range
- The HC range of Codip pumps incorporate an integral 316 stainless steel heat exchanger for processes where the pump medium has to be kept at a constant temperature.
- The heat exchanger is positioned inside the pump body, fully immersed in the inert liquid and surrounds the tubular diaphragm.
- The heat exchanger can be heated or cooled using oil, water, steam or any heat transfer medium.
- No form of external heating/cooling or trace heating of the pump is required.
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