Which types of pumps are used in chilled water systems?

Generally horizontal end suction cast iron glanded pumps

inline pumps?

Any type of pumps are suitable depending on the required duty point within the flow limitations of the chillers and project speciefications.
In line pumps usually used for smaller flow or for pressure bosting in chilled water system.
Davide advise is acceptable in general but since that type of pumps are the cheepest.

It will depend on the design. You may see horizontal split case pumps on larger flows for primary/secondary pumping applications but you will also see end suction centrifugals as well. There could be vertical turbine pumps on condenser water applications but I'm seeing more horizontal splits or end suction pumps for the same. In line pumps could be used but not as common as split case or end suction due to the size limitations to in line products. Most of the time, it comes down to the budget.

In General recommendations for HVAC applications
Close-coupled end suction pumps or In-line circulating pumps or for low flow(less than 50 gpm) circulating systems.
Base-mounted end suction pumps for circulating systems with flow rates between 50 and 500 GPM.
Horizontal split case, double-suction pumps for applications with flow rates exceeding 500 GPM.
Vertical in-line pumps shall be considered for applications with limited floor space.

Thanks to all for sharing your valuable informations...:)

We have rented our high pressure end suction centrifugal pumps to contractors in the past for chilled water system. The flow requirements have typically been 7 ft/sec to get the particles moving, flow obviously based on the line sizes. Another great factor is the total length of the piping and elevation of the system to determine the pressure rating. We have had success as I mentioned with our Cornell high pressure end suction centrifugal diesel driven pumps, capable of max 175 psi and max 800 gpm.

general practise in pumping system in hvac is using either end suction pumps or horizontal split coupled pumps selected on the efficiency at the design duty points where the pumps never operates.. the best recomended pumping system irespective to variable speed application or constant speed pumping system is Vertical Inline pumps with split coupling so that as the major culprit, mechanical seal which is the cause of pump breakdown is kept out outside can b replaced within half an hour max by an unskilled labour* due to very minimal vibration level these pumps can be connected to the piping like a valve and hence pumps can brought closer to the chiller results in reduction of frictional loss of the system which ultimaty reduces the power consumption and it doesnt requires inertia base , concrete structure and hence the first investment cost is cheaper while comparing...

Please advise:
Flow Rate
Suction Pressure
Discharge Pressure
Total system water volume
Material of system tank and piping
What is duty cycle 24/7/365
What reliability do you require (life cycle in operating hours)
Water temp at pump suction