Steam Driven Pumps

The pumps of the TITANO series are designed and manufactured according to API 674 and ASME standards and cover the range of medium power up to 600 kW.
These pumps are studied to guarantee a highly reliable service and to minimize the maintenance operations and the operating costs.
The TITANO series consists of 4 pump sizes in triplex execution. The largest pump of the series (model 31.40) is manufactured also in quintuplex (model 31.40/Q) and septuplex (model 31.40/S) execution, where the same components of the triplex model are used.

Steam End

The steam end is substantially an integral two cylinders reciprocating steam engine.

Each cylinder houses a steam piston which is connected to a slide valve by a rod and levers. The inlet and the outlet of the steam end are controlled by the slide valve. The steam enters at one side of the steam cylinder through the slide valve and pushes the piston towards the opposite side.

As the piston reaches the end of the stroke, the slide valve reverses the steam flow, which reverses the piston movement. The speed and consequently the number of cycles are strictly proportional to the amount and to the pressure of steam admitted. This speed is regulated by controlling the steam inlet valve.

The steam piston is sturdily connected with the hydraulic piston or plunger that acts on the fluid in the liquid end.

Liquid end

Steam driven pumps use as displacer either a piston that is sealed to the hydraulic cylinder by piston rings, or in case of high discharge pressures, a plunger with packing.

Double-acting means that during pump operation, the fluid at one end of the piston is in the suction phase while the other end of the piston is in the discharge phase.

Therefore, a double – acting pump makes two suction and two discharge strokes for each complete reciprocating cycle and has two suction and two discharge valves.

The valves installed on the liquid end are either wing type for clean fluids with low viscosity, or ball valves for fluids having high viscosity and/or containing solids. The piston rod packing prevents liquid from leaking out of the hydraulic cylinder.

All models can be supplied with a stuffing box cooling jacket on the hydraulic side.

Operating Features

The direct-acting steam pumps are very flexible machines. They can operate at any point of pressure and flow within the range of characteristics of the particular pump design.

The speed of the pump, and therefore the capacity of the pump, can be controlled from zero to maximum by a manually or automatically operated throttling valve on the steam supply.

The maximum speed is mainly limited by the frequency with which the valves will open and close smoothly.

The pump can operate against any system counter pressure, from zero to its maximum allowable working pressure.

In a specific application, however, the hydraulic end maximum pressure may be limited by the available steam pressure and by the ratio of the steam piston and liquid piston areas.

A common characteristic of both Vesuvio and Vulcano steam driven pumps is the very low value of the NPSHr.

In fact, the liquid end of these pumps is designed to maximize all the passages of the fluid flow, specifically in the valves area. Additionally, the pumps are always selected to operate at a very low speed.

For this reason, one of the main applications of the steam driven pumps is the pump-out service in the Refineries, where the NPSH available is often low and the fluids handled are miscellaneous hydrocarbons often with high viscosity and high temperature.


The range of Peroni Steam Driven Pumps includes three Series of pumps designed and manufactured according to API 674 Standard.

Vesuvio 42.00 Series
Piston pump
Delivery Pressure: up to 21 bar (305 psi)
Capacity: up to 41 m3/h (182 GPM)
Steam pressure: 18 bar (261 psi)

Vesuvio 46.00 Series
Piston pump
Delivery Pressure: up to 45 bar (650 psi)
Capacity: up to 293 m3/h (1290 GPM)
Steam pressure: 16 bar (230 psi)

Vulcano 47.00 Series
Opposite plungers pump
Delivery Pressure: up to 130 bar (1885 psi)
Capacity: up to 39 m3/h (174 GPM)
Steam pressure: 16 bar (230 psi)

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