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Hannemann & Pruss GmbH Landwehrstrasse 36 ; D-42699 Solingen ( Germany) Tel.: +49 (0) 212-38351-0 Fax : +49 (0) 212-38351-10

Mr. Drehmel / Dept Service Tel.: -22 [email protected]. Bexa / Dept Hydraulic Tel.: -32 [email protected]. Nosko / Dept Sales Tel.: -25 [email protected]

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certificates

company

DGRL / PED

Elecrr.- hydraulic and pneumatic operated satety function of

control valves

Production and sales of valves

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certificates 1

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certificates 2

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certificates 3

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service

products

inspection, maintenance, repair or modification works on Hannemann products and foreign products world wide

consulting and training

key turn solutions form planning to commissioning

service on all kinds of actuators, incl. adaptationof new actuators on existing valves

modernization of control loops, incl. control cabinets, wiring, testing and commissioning

connection of existing control loops with modern DCS-systems

service hotline

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bypass steam conversion station

example

hydraulic operated

incl. safety function acc. TRD 421

seat mesh 3 mm

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Valvesactuators

hydraulical

cylinders

motor/pump unit

control cabinet

piston actuators

pneumatical

customer request

electrical

for hydraulic actuators

for pneumatic actuators

steam pressure test device

safety equipment acc. TRD421

measurements and controls

products

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hydraulic control cylinders with safety function

open / close

actuators

control cylinder

central Hydraulik unit

cylinders

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cylinders


model

control algorithm

actuators

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TRD scheme

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hydraulic control cylinder with safety function

1) cylinder2) control block with control valve3) spring housing4) plate spring column5) position feedback transmitter6) safety equipment acc. to TRD 421


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Type example HP / LP Steam Conditioning Stationscontrol algorithmSteam-pressure-reducing CV will be controlled by DCS-Systemand is additionally equipped with a safety function acc. to TRD421safety function of TRD421 has priority and is operated bysteam test device ("Dampfprüfstock")safety parameter is:- downstream pressure >= set pressurevalve will be closed by spring (control signal cannot open the valve)

- during turbine operation (Station in stand-by), the steam pressurereducing valve and the spray water CV are closed by spring.The steam flow [kg/s] through the turbine should be measured to preadjust a valve stroke, according to the valve characteristic curvesIn the case of turbine trip, the valve opening will then follow the actual flow parameter.

- during continous operation, the steam pressure reducing valvescontrol parameters are deviations from:

- upstream pressure p1, and/or- downstream pressure p2

Spray water CV will be controlled by DCS-Systemduring stand-by operation, the valves has to be locked in its closed positions. (no spray water flow without steam flow through the station!)

control parameters are deviations from:- stroke of the steam pressure reducing CV, and- downstrem temperature t2 (behind desuperheater)

during continous operation, the control parameters are deviations from:- Downstrem temperature t2 (behind desuperheater)

the characteristic of both water and steam CV can be programmed in DCS-system.

hydraulic control cylinders with safety function algorithm

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Steam test device TRD421

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cylinders

model

Control cylinder

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control cylinder schem

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control cylinder model

control cylinder

1) cylinder2) control block with control valve3) spring housing4) plate spring column5) position feedback transmitter

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control cylinder quick open- close with spring

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control cylinder quick open- close with spring

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control cylinder quick open- close without spring

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motor pump unit

actuators

pictures

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motor pump unit scheme

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motor pump unit scheme

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motor pump unit drawing

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motor pump unit pictures

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motor pump unit pictures

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control cabinet

actuators

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control cabinet

actuators

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cylinders

functions

actuator open close

model

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actuator open close scheme

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Actuator with open close functions

Pos.hydraulic cylinder

HZ03

solenoid valveWV21

to drive the spray water isolation valvesingle acting, spring to close the valve

hand operated throttling valve DV44

to adjust the actuating time of the cylinder from 0% to 100% stroke

adjustable check valueDV45

to adjust the actuating time of the cylinder from 100% to 0% stroke

limit switchesES05

to give signal about the open/close position ES06of the valve to DCS-system

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open/close actuator

1) hydraulic cylinder2) control block with solenoid valve3) spring housing4) plate spring column

open/close actuator

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pruss valve

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