Page 62 - impiantistica_3_2015

string tested at the Termomeccanica Pompe m³/h, but with a head of 106 m at a speed of 1483

facilities in La Spezia (Italy). rpm. In turn, the BP is driven by a motor with a

capacity of 500 kW, a voltage of 6000 V at a fixed

The industrial implementation of this valuable speed of 1483 rpm.

technology is outlined below, together with Nidec Considering the importance of the equipment

ASI’s background in the oil & gas market and and of the uninterrupted operation of the plant,

capabilities in the oil field projects. each pumping unit is also equipped with a Local

Thanks to over forty-years’ experience in the oil & Equipment Room (LER) ensuring the control of

gas industry, Nidec ASI can supply the most important parameters,

equipment of vital importance for i.e. temperature, pressure

the oil & gas value chain, from and vibration levels. All these

extraction to finished product. Nidec ASI has been widely parameters allow the monitoring
Nidec ASI has been chosen for proven to be an extremely of the correct operation of the
this project, for the inner ability valuable partner, able to pumping units, even by remote
to engineer customized solutions control, thus minimizing any
to apply in the wide variety of the meet the technological risk of default and extending
oil & gas market. Components challenges that new maintenance intervals.
are custom-designed and fields and new processes In order to have compact VFD
manufactured for life-cycle and LER, the cooling of the VFD
performance, thus reducing total present, especially on is provided by external chillers,
operating costs. This kind of best-fit solutions tailored to in order to bring the secondary
approach helps optimize Capital specific requirements coolant temperature well below the
Investment Costs (Capex) and life- max 55 °C ambient temperature of

cycle costs (Opex) maximizing the the desert climate (1).

reliability and safe operation of the Each PDS includes the following

equipment. main components:

Nidec ASI has been widely proven to be an • 1 input step-down isolation power transformer,

extremely valuable partner, able to meet the rated power 10,400 kVA at +55 °C ambient

technological challenges that new fields and new temperature, 33 kV / 4 × 1.8 kV, Onan, mineral

processes present, especially on best-fit solutions oil type, outdoor installation, suitable for NPC

tailored to specific requirements. Finally service, (Neutral Point Clamped) voltage source power

which guarantees maximum reliability, has been converter supply in 24 pulses configuration;

offered also to this project, providing as usual • 1 medium voltage VFD, type SVTN 10K8 W33-

a complete life cycle service for all the products, 24P, IP41 cabinet for indoor installation, water-

solutions and system delivered. to-water cooling system, VSI (Voltage Source

Inverter), PWM (Pulse Width Modulation),

The power drive system IGBT (Insulated Gate Bipolar Transistor)
inverter bridge, NPC, 3 levels, 3.3 kV output

Each Termomeccanica Pompe pumping unit motor voltage, 24 pulses reaction line side and

includes a Main Injection Pump (MIP), API 610 6 pulses reaction motor side;

BB5-type, centrifugal, with a total flow of 1100 • 1 medium voltage adjustable-speed induction

m³/h and a head of 2000 m at a speed of 5600 motor for MIP, type CT 900 Y4, rated 8700

rpm. The MIP is driven by an electric motor with a kW, 1493 rpm, 3.3 kV, speed range 70÷100%,

power capacity of 8700 kW, a voltage of 3300 V suitable for a VFD supply;

and a speed of 1493 rpm. • 1 medium voltage fixed-speed induction

A gearbox is inserted between the pump and the motor for BP, type CT 400 Y4, rated 500 kW,

motor, so as to increase the speed from 1493 rpm 1483 rpm, 6.0 kV, suitable for Direct-On-Line

(at motor shaft) to 5625 rpm (at pump shaft). (DOL) supply.

The pumping unit, including the MIP, gearbox and

electric motor, is lubricated by a lube oil system The VFD is complemented by 1 LER to be installed

with a capacity of 5000 l and a flow of 300 l/min. in and 1 external cooling system for the VFD’s

The motors driving the MIPs are equipped with a secondary water coolant (chiller).

Variable Frequency Drive (VFD) in order to optimize Each main component is designed for its specific

production and consumption depending on the conditions:

different requirements during operating time. • environment / climate: industrial / desert;

Each pumping unit is equipped with a 10 MW • area: non-hazardous, safe;

power transformer, reducing the 32 kV plant line • ambient temperature: -5÷55 °C outdoor /

voltage to the 4 × 1.8 kV input voltage of the VFD +5÷45 °C indoor;

connected to the motor. • cooling water inlet temperature: +25 °C (VFD

The MIP is also connected to a Booster Pump (BP), chiller outlet);

API 610 BB-type, with the same capacity of 1100 • relative humidity: max 95% non-condensing,

60 Impiantistica Italiana - Maggio-Giugno 2015