Allen Steam Turbines

ExcellentPower & Industrial Solutions

Allen Steam Turbines

Power Generation Solutions

Allen Steam Turbines The Trusted Name In Power Generation

Weir Power & Industrial’s Allen Steam Turbines was originally part of the world renowned W H Allen Sons & Co. Ltd, which was established at the Queen’s Engineering Works, Bedford in 1894.

The company has a long and illustrious history as manufacturers of steam turbines, pumps and diesel engines.

In 1999, during ownership by Rolls-Royce plc, the decision was taken to focus on turbine refurbishment, support and maintenance rather than commercial manufacture, and in 2001 Allen Steam Turbines became part of Weir Power & Industrial.

For over 100 years, Allen Steam Turbines has continued to support its installed turbine base throughout Europe and the world. The company is situated in modern premises located in Bedford, and from this site they provide Site Engineering Support, Design and Analysis, Technical Support and Spares Supply to customers in varying industries including Sugar, Waste to Energy, Paper and Pulp and Naval Marine.

To complement these support services, Allen Steam Turbines now offers a competitive range of turbines manufactured by their partner NG Metalúrgica of Brazil, which has evolved directly from the Allen turbine design.

Allen Steam Turbines are accredited to the following international standards: ISO9001:2000, ISO14001:2004 and OHSAS18001:2007.

An original Allen turbine

Allen Steam Turbines Bedford workshop

Weir Power & Industrial Power Generation Solutions 2


Allen Steam Turbines and NG MetalúrgicaPartners in Power

Working Together

For over 30 years, Allen Steam Turbines has been working closely with Brazilian company NG Metalúrgica. Throughout this time NG and Allen have constantly enhanced the design, efficiency and performance of the Allen design of turbines, culminating in a proven, reliable machine capable of meeting the most exacting demands required in today’s applications. As a result of this collaboration, the machines produced by NG have established a significant presence in the South American market. Working in partnership, Allen Steam Turbines and NG now offer the NG Allen range of steam turbines to customers throughout the rest of the world.

The turbines are manufactured by NG, with project management, installation, commissioning, technical support and ongoing after-sales support provided by Allen Steam Turbines.

NG Metalúrgica – an Introduction

NG Metalúrgica is a family owned Brazilian company established in 1920. It has advanced manufacturing facilities operating from custom-built sites in Piracicaba, São Paulo state.

The modern designs of the NG Allen range demand sophisticated manufacturing techniques and a high degree of precision. The constantly updated manufacturing facilities, producing more than 60 turbine designs, are fully equipped to meet these demands. The facilities also contain research and

development centres and a large team of engineering specialists, afforded the most advanced software and equipment to allow continuous improvement and new product development.

Along with national approvals from Petrobras and Brazilian Navy certification, NG meets major international standards such as ISO9001:2000.

NG Capim Fino workshop

NG manufacturing complex - Capim Fino

NG head office

The NG Allen Range A Steam Turbine for Every Application

NG Allen single and multi-stage steam turbines are configured in six distinct series:

L Series, a condensing model only, designed for low inlet steam conditions up to 12 bara/350°C.

M Series, available in back pressure or condensing types, designed for medium inlet steam conditions up to 45 bara/450°C.

H Series, also available in back pressure or condensing types, designed for high inlet steam conditions up to 86 bara/520°C.

Each L, M and H model’s specification is defined by a sequence of letters and numbers - the first letter indicates the turbine type: B for “Back Pressure” and C for “Condensing”. The numbers indicate the approximate mean diameter of the wheels. Finally, the suffix E indicates the provision of controlled extraction, available only on the H Series of machines.

DSE Series, available for back-pressure or atmospheric exhaust. Power range from 5 kW to 1200 kW. Suited to small mechanical drive and fully API compliant.

Ce Series, available for back-pressure or atmospheric exhaust. Robust single stage machine fully API compliant.

DME Series, Multi-stage turbine ideally suited to mechanical drives with up to 35% saving on steam consumption over the DSE series. Fully API compliant.


HC 1000 E – Extraction Condensing – 33,300 kW

H Series - Back Pressure – 21,000 kW

Ce series

DSE/DME series


L Series

Type Condensing

Model LC 500 LC 650 LC 800 LC 1000 LC 1250

Maximum Power 6,000 kW 11,000 kW 20,000 kW 25,000 kW 32,000 kW

Rated Speed 10,250 rpm 8,500 rpm 6,500 rpm 5,400 rpm 4,750 rpm

Max. Inlet Pressure 12 bara 12 bara 12 bara 12 bara 12 bara

Max. Inlet Temperature 350ºC 350ºC 350ºC 350ºC 350ºC

Max. Exhaust Pressure Vacuum Vacuum Vacuum Vacuum Vacuum

Inlet Flange 2 x 200 mm 2 x 250 mm 2 x 300 mm 2 x 350 mm 2 x 350 mm

Exhaust Flange 800 mm 1020 mm 1370 mm 1680 mm 1930 mm

Type Condensing with double flow exhaust

Model LC 500/500 LC 650/650 LC 800/800 LC 1000/1000 LC 1250/1250







Exhaust Flange 2 x 800 mm 2 x 1020 mm 2 x 1370 mm 2 x 1680 mm 2 x 1930 mm


M Series

Type Back pressure

Model MB 350 MB 420 MB 510 MB 630 MB 750 MB 900

Maximum Power 7,000 kW 10,000 kW 15,000 kW 22,000 kW 35,000 kW 42,000 kW

Rated Speed 11,500 rpm 9,250 rpm 8,000 rpm 6,500 rpm 5,800 rpm 4,750 rpm

Max. Inlet Pressure 45 bara 45 bara 45 bara 45 bara 45 bara 45 bara

Max. Inlet Temperature 450ºC 450ºC 450ºC 450ºC 450ºC 450ºC

Max. Exhaust Pressure 22 bara 22 bara 22 bara 22 bara 22 bara 22 bara

Inlet Flange 2 x 150 mm 2 x 200 mm 2 x 200 mm 2 x 250 mm 2 x 300 mm 2 x 350 mm

Exhaust Flange 400 mm 500 mm 600 mm 760 mm 900 mm 1070 mm


Model MC 500/500 MC 650/650 MC 800/800 MC 1000/1000 MC 1250/1250








Type Condensing

Model MC 500 MC 650 MC 800 MC 1000 MC 1250









H Series

Type Back pressure

Model HB 350 HB 420 HB 510 HB 630 HB 750 HB 900

Maximum Power 10,000 kW 15,000 kW 22,000 kW 32,000 kW 50,000 kW 60,000 kW

Rated Speed 11,500 rpm 9,250 rpm 8,000 rpm 6,500 rpm 5,800 rpm 4,750 rpm

Max. Inlet Pressure 86 bara 86 bara 86 bara 86 bara 86 bara 86 bara

Max. Inlet Temperature 520ºC 520ºC 520ºC 520ºC 520ºC 520ºC

Max. Exhaust Pressure 22 bara 22 bara 22 bara 22 bara 22 bara 22 bara

Inlet Flange 2 x 100 mm 2 x 150 mm 2 x 200 mm 2 x 250 mm 2 x 250 mm 2 x 300 mm

Exhaust Flange 400 mm 500 mm 600 mm 760 mm 900 mm 1070 mm


Model HC 500/500 HC 650/650 HC 800/800 HC 1000/1000 HC 1250/1250








Type Condensing

Model HC 500 HC 650 HC 800 HC 1000 HC 1250









DSE 180 DSE 400 DSE 550 DSE 700

Power 50 kW 220 kW 800 kW 1,200 kW

Inlet P 22 bara 43 bara 43 bara 43 bara

Inlet T 300ºC 400ºC 400ºC 400ºC

Exhaust P 8 bara 8 bara 8 bara 8 bara

Ce Series

Series 300 Series 600 Series 1100

Power 3,000 kW 3,000 kW 1,800 kW

Inlet P 32 bara 43 bara 65 bara

Inlet T 350ºC 400ºC 450ºC

Exhaust P 8 bara 13 bara 13 bara

DSE Series

Single Stage Turbine Ratings

DME 450 DME 500 DME 560 DME 700

Power 6,000 kW 1,800 kW 15,000 kW 3,200 kW

Inlet P 45 bara 43 bara 45 bara 43 bara

Inlet T 450ºC 400ºC 450ºC 400ºC

Exhaust P 5 bara 5 bara 5 bara 5 bara

Multi-Stage Turbine Ratings

DME Series


Turbine Casing

The turbine HP casing is made in cast steel, split on the horizontal and axial centre lines. The top half has an integrated steam chest, with vertical control valves within the casing. This is a compact arrangement and has the advantage of minimising the thermal stresses experienced during rapid machine start-up. The casing halves are secured with high alloy fasteners, thermally tensioned to provide a perfect seal.

Two axial arms on the front of the cylinder provide support via radial keyways on the bearing housing, with alignment controlled by an axial key on the machine centre line. Thermal expansion is controlled by radial keys at the exhaust end of the machine and axial expansion via the bearing housing slideways at the front of the machine.

The fixed point of the rotor in relation to the turbine casing is the thrust bearing at the HP end of the rotor, therefore minimising the relative movement between stationary and rotating parts.

The L,M and H Series Construction Features

The L, M and H Series multi stage steam turbines are NG Allen’s answer to safe, economical and efficient power generation.

The main characteristics of these machines are cost effective investment and high performance in the range 5 to 65 MW.

The series offers flexible operation for power and heat generation in co-generation systems, particularly in those using biomass or waste product fuels.

Modular Design Concept

The combination of standardised modules - front, intermediate and rear - results in machines that precisely meet the specific operating conditions, minimise costs and produce the most efficient machine for the particular application.


Cross section of emergency valve

Multiple Control Valves

Control at all loads is assured by an electrohydraulic actuator, positioned by a digital electronic governor. There are four vertically positioned control valves on the top casing which are operated against individual compression springs to provide failsafe shut down.

Each valve controls the steam admission to a first stage nozzle group and can maintain a set pressure at the steam inlet or exhaust. During turbine automatic start, the control valves are partially opened to ensure uniform heating of the casing. This minimises thermal stresses and deformation, to prevent mechanical contact between the rotor and the shaft sealing.

Combined stop and emergency valve

This valve is of the hydraulically actuated, quick shut off type, with the facility for on line free movement checks in accordance with API 612 requirements.

It is mounted in a valve body made from material identical to the main casing and can be removed without disconnecting the steam admission piping.

The valve body is fitted internally with a stainless steel steam strainer upstream of the valve to provide protection against foreign particle ingress from the admission steam piping. The opening of the valve is controlled automatically to obtain a speed ramp according to the start-up curve for the machine. The speed ramp is configured in the speed governor so that the start is independent of operators’ actions.

In an emergency situation the valve closes automatically to stop the steam admission and protect the machine.

Rotor

The rotor is monobloc type with integrally forged discs manufactured from high alloy steel, ultrasonically tested and dynamically balanced. The rotor is balanced at each stage of the blading assembly to achieve smooth operation and extended service life of the machine.

Tip Seals and Advanced Blade Technology

The blade profiles are developed through the most modern technology using three dimensional finite element analysis. This ensures the development of machines mechanically optimised for the most efficient thermodynamic energy conversion.




Shaft Steam Sealing System

The system consists of metallic labyrinth rings made in stainless steel and fitted with a steam leakage extraction system. The sealing between stages is by floating type labyrinths assembled on the diaphragms which provide effective sealing while being easily replaced. The external sealing is by floating type labyrinths.

Controlled Extraction Valve

The H Series turbines can be fitted with controlled extraction valves for up to 95% of the total admission steam flow.

Two types of controlled extraction valves are possible:

■ vertically mounted balanced valves for high and medium pressures

■ a gate-type rotary valve for low extraction pressures (as shown).

Turbine Bearings

Both thrust and journal bearings are of the white metal lined, tilting pad type, thus guaranteeing high dynamic stability of the turbine rotor. The thrust bearings are constructed to withstand the maximum axial thrust loads in both directions.

Oil System

The oil system is pressure fed type, consisting of a centralised unit supplying common lubrication to the turbine, gearbox and driven unit, and including a supply for the control oil circuit.

The system comprises:

■ Oil reservoir with level gauge, vent and drain

■ Twin oil cooler with change over valve

■ Duplex oil filter for the lubricating oil system

■ Duplex oil filter for the control oil system

■ Gearbox low speed shaft driven main lubrication and control oil pump

■ AC electric motor driven auxiliary lubricating and control oil pump

■ DC electric motor driven or auxiliary steam turbine driven run down emergency oil pump

■ AC electric motor driven barring and lifting device oil pump (if fitted)

■ Oil mist extraction fan

■ Pressure relief control, check and block valves, orifice plates and flow gauges at bearing housing drain piping

■ Oil piping


Control Systems

The Control Panel provides complete management of the turbine, gearbox and generator via a comprehensive suite of functions:

■ Monitoring of axial displacement and relative vibration adjacent to the rotor shaft bearing

■ Programmable Logic Controller - PLC

■ Digital speed governor

■ Digital overspeed trip system

■ Human-Machine Interface (HMI), including alarm and shutdown functions for the control and protection of the turbine and gearbox unit

■ An independent shutdown circuit for total turbine and gearbox protection, even in the event of PLC logic failure

■ Automation of lubricating oil pumps

■ Control switches for oil pumps

■ The ability to test the shutdown circuit during normal turbine operation

■ Admission steam pressure control

■ Extraction steam pressure control

■ Exhaust steam pressure control

■ Control of the generated power

■ Frequency control

■ Interconnection with digital control systems


DSE, Ce and DME Series Construction Features

The DSE Series turbines are designed with lubrication by rings for fast start in emergency or stand-by operation, and for working intermittently. They can also have forced lubrication. They comply with NEMA standards and API 611 and API 612.

The Ce Series turbines are some of the most robust single stage machines on the market. Suited to extreme operational conditions and services, they respond efficiently to power variations. They comply with NEMA standards and API 611 and API 612.

Item DSE Ce DME

Housing Cast Steel, Horizontally split at the centre line

Rotor Twin Supports with shaft and disc made of forged alloy steel

Bearings Horizontally split bush type

Speed Regulator (Governor) NG or Woodward hydraulic, Woodward or Dawson electronic

Number of Control Valves Three

Steam Sealing Graphite mechanical seal with metal labyrinth Steam Ejector

Oil Seal Mechanical seal with metal labyrinth Metal Labyrinth

Electrical and Instrument Panel Explosion proof

Test at Factory Optional

The DME Series is a more efficient multi stage steam turbine based on the DSE Series.


Allen Steam Turbines’ team of technicians and engineers have experience in the installation of new turbines and auxiliary systems worldwide. These services include:

■ Full installation package or supervision only

■ Checking and preparing the base, prior to installation

■ Correct location and installation on the base

■ Levelling and alignment

■ Supervision of steam pipe blowing

■ Full commissioning of oil, steam, water, electrical, regulation and safety systems

■ Start up testing including governor response, load rejections, etc.

■ Performance testing evaluation

■ Training of maintenance and operation personnel

Support and service

A team of customer-support experts deliver an after-sale service designed to cover every eventuality and need, including:

■ Technical assistance

■ Fast-response breakdown

■ Problem-solving and repair

■ Replacement parts

■ Equipment monitoring

■ Performance evaluation

■ Retrofit appraisal and delivery

■ Routine and planned maintenance

■ Long-term maintenance and support packages

Parts

As a key function of this service, Allen Steam Turbines provide original turbine spare parts. Parts are supplied worldwide, from labyrinth seals through to complete rotors and diaphragms. Every component is manufactured to the same exacting standards as the original, ensuring that operational integrity is protected.

Other products

Incorporated in the Allen Steam Turbines business are Allen Gwynnes Pumps (<12”), Vickers, Vacseal and Nimbus Pumps, which continue to be manufactured and supported.

Installation and start up

Re-Blade of 20 MWe Condensing set

30 MWe Twin Cylinder Condensing Set

ExcellentPower & Industrial Solutions

Allen Steam Turbines

Highfield Parc Highfield Road Oakley Bedfordshire MK43 7TA England

Tel: +44 (0)1234 826691 Fax: +44 (0)1234 826649 E-mail: [email protected]: www.weirpowerindustrial.com

Please visit our website for further information on services and locations near you

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5143

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10

Calgary

MontréalToronto Boston

Cardiff

Washington

Fort St. John

Salt Lake City Beijing, China

Suzhou, China New Delhi, India

Bangalore, India

Kuala Lumpur, Malaysia

Sharjah, UAE

Vendin Le Vieil, France

Chateaunneuf les Martigues, France

AlloaEast Kilbride

Teesside

Northwich

Huddersfield Barton on Humber

Warwick

Elland

Gyonggi-Do, South Korea

Bedford

Johannesburg, S. Africa

Allen Steam Turbines

Documents

weir power

inlet temperature

series construction

allen steam

inlet pressure

ng allen range

controlled

fully api