STEAM DRIVEN PUMPS

Since the early 20th century, Peroni has specialized in the engineering and production of steam driven reciprocating pumps for use in boiler feed service, low NPSHA pump-out service, and various process applications within Petrochemical Plants and Refineries. Steam driven pumps pumps are reciprocating, horizontal duplex, double-acting units, directly transmitting power to the liquid end via the action of the motive fluid on the piston, where the primary motive fluid is steam, though air or gas can also be utilized.

The series comprises three models: two are designed for low-pressure applications with one each for low capacities (Vesuvio 42.00) and high capacities (Vesuvio 46.00), and the third model is a high-pressure horizontal duplex, double-acting reciprocating plunger pump with opposite plungers (Vulcano 47.00)

Steam End Configuration

The steam end functions essentially as a two-cylinder reciprocating steam engine. Each cylinder contains a steam piston linked to a slide valve by a connecting rod and levers, controlling steam entry and exit. Steam admission on one side of the cylinder pushes the piston to the opposite side. Upon reaching the stroke end, the slide valve shifts to reverse the steam flow and piston direction. The speed and cycle rate depend on the steam volume and pressure, regulated by the steam inlet valve.

Liquid End Design

These pumps use a piston sealed by piston rings for displacement, or a plunger with packing for higher discharge pressures. The double-acting configuration means that fluid is simultaneously drawn in (suction) and expelled (discharge) at opposing ends of the piston during each cycle, with two suction and two discharge valves facilitating this process. Valve selection—wing type for clean, low-viscosity fluids or ball valves for high-viscosity fluids or slurries—depends on fluid properties. Models are equipped with a stuffing box cooling jacket on the hydraulic side to prevent leakage.

Operational Features

Peroni steam driven pumps are noted for their operational flexibility, capable of functioning across a spectrum of pressure and flow rates within the design parameters of each pump. The output rate can be adjusted from minimum to maximum through manual or automatic throttling of the steam supply. The operating limits are generally defined by valve operation frequency.

Applications and Performances

Highlighted by their low NPSHr values, the Vesuvio and Vulcano series are designed to enhance fluid flow, especially through the valve areas, and are selected to operate at reduced speeds. This design consideration makes them particularly suitable for refinery pump-out services where available NPSH is low and the fluids processed are often high-viscosity hydrocarbons at elevated temperatures.

Series Specifications

Each steam driven pump is designed in alignment with API 674 standards, ensuring they meet specific requirements for reliability and performance in their designated applications.

Vesuvio 42.00

A piston pump with up to 21 bar (305 psi) delivery pressure and 41 m³/h (182 GPM) capacity, supported by steam pressure up to 18 bar (261 psi).

Vesuvio 46.00

Offers delivery pressure up to 45 bar (650 psi) and capacity up to 293 m³/h (1290 GPM), with steam pressure at 16 bar (230 psi).

Vulcano 47.00

An opposite plungers pump capable of 130 bar (1885 psi) delivery pressure and 39 m³/h (174 GPM) capacity, also at 16 bar (230 psi) steam pressure.