Brochure

References 55

SIMATIC ET 200iSP

Norr Systems, Singapore –

cargo and ballast system

Requirements

The loading and unloading of liquids from tanks is a great

challenge. The emphasis on safety is thereby of greatest im-

portance. Especially with hazardous and flammable materials,

the proper loading and unloading procedure is an important

task of the freight master. Thus the valve control has become

the most important system within the freight distribution. The

valve control system must be constructed from reliable com-

ponents. Any error in this system can result in undesired con-

sequences for the safety of both the ship and the crew.

Solution

NORR SYSTEMS has developed an interesting control system

which uses hydraulic high-pressure and low-pressure valves

and integrates Siemens automation products. Considered

from the mechanical perspective, an intrinsically safe low-

pressure way valve increases the reliability (the purity of the

oil is less significant than with a high-pressure way valve) and

simplifies the maintenance. Seen from the electronic view-

point, the SIMATIC controls from Siemens together with the

intrinsically safe distributed I/O SIMATIC ET 200iSP and

PROFIBUS form a good solution for communication between

hazardous (Zone 1) and non-hazardous areas. The electric

control and response signals for the valve control system are

carried out via PROFIBUS.

The expense for the ship installation was minimized and in the

software specification many additional functions for error di-

agnostics of the entire system could be programmed. It was

even more important that thanks to the Siemens solution the

number of components used in the entire system could be re-

duced and the availability of the entire system could be in-

creased.

Benefits

The main benefit of this integrated hydraulic valve control sys-

tem is that it completely fulfills the special requirements of the

customer for both user friendliness and simple maintenance.

The SIMATIC ET 200iSP allows for extremely easy establish-

ment of communication between the hazardous and safe ar-

eas and the avoidance of a Zener barrier. The customer is high-

ly satisfied with this system, since it supports the ship's crew

in the loading and unloading of freight in one of the offshore

oil fields.

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