Richter BVIP/F Series Ball Valves (ISO/DIN) Manuel d'utilisateur télécharger pdf (Page 7)

Series BVI/F, BVIP/F Page 7

9520-090-en Revision 10

TM 8361 Edition 10/2011

3 Safety notes for applications in potentially explosive areas

based on the Directive 94/9/ EC (ATEX)

The valves are intended for use in a potentially

explosive area and are therefore subject to the

conformity assessment procedure of the directive

94/9/EC (ATEX).

As part of this conformity assessment, an ignition

hazard analysis to EN 13463-1 to satisfy the

fundamental safety and health requirements was

conducted with the following result:

 The valves do not have any ignition source of

their own and can be operated both manually

as well as mechanically/electrically.

 The valves are not covered by the scope of

application of the ATEX directive and therefore

do not need to be identified accordingly.

 The valves may be used in a potentially

explosive area.

Supplementary notes:

 Electric/mechanical actuators must be

subjected to their own conformity assessment

to ATEX.

It is imperative to observe the individual points of

intended use for application in a potentially explosive

area.

3.1 Intended use

Improper operation, even for brief periods, may

result in serious damage to the unit.

In connection with explosion protection, potential

sources of ignition (overheating, electrostatic and

induced charges, mechanical and electric sparks)

may result from these improper operation; their

occurrence can only be prevented by adhering to

the intended use.

Furthermore, reference is made in this connection to

the Directive 95/C332/06 (ATEX 118a) which contains

the minimum regulations for improving the occupa-

tional health and safety of the workers who may be at

risk from an explosive atmosphere.

A difference is made between two cases for the use of

chargeable liquids (conductivity <10

-8

S/m):

1. Chargeable liquid and non-conductive

lining

Charges can occur on the lining surface. As a

result, this can produce discharges inside the

valve. However, these discharges cannot cause

ignitions if the valve is completely filled with me-

dium.

If the valve is not completely filled with medium,

e.g. during evacuation and filling, the formation of

an explosive atmosphere must be prevented, e.g.

by superimposing a layer of nitrogen.

It is recommended to wait 1 hour before removing

the valve from the plant in order to permit the

elimination of static peak charges.

This means that, to safely prevent ignitions, the

valve must be completely filled with medium at all

times or else a potentially explosive atmosphere

must be excluded by superimposing a layer of inert

gas.

2. Chargeable liquid and conductive lining

No hazardous charges can occur as charges are

discharged direct via the lining and shell (surface

resistance <10

Ohm, leakage resistance

<10

Ohm).

Static discharges of non-conductive linings are

only produced through the interaction with a

non-conductive medium and are therefore the

responsibility of the plant operator.

Static discharges are not sources of ignition

which stem from the valves themselves!

 The temperature of the medium must not exceed

the temperature of the corresponding temperature

class or the maximum admissible medium tem-

perature as per the operating manual.

 If the valve is heated (e.g. heating jacket), it must

be ensured that the temperature classes pre-

scribed in the Annex are observed.

 To achieve safe and reliable operation, it must be

ensured in inspections at regular intervals that the

unit is properly serviced and kept in technically

perfect order.

 Increased wear to the valve can be expected with

the conveyance of liquids containing abrasive

constituents. The inspection intervals are to be

reduced compared with the usual times.

 Actuators and electric peripherals, such as

temperature, pressure and flow sensors etc., must

comply with the valid safety requirements and

explosion protection provisions.

 The valve must be grounded.

This can be achieved in the simplest way via the

pipe screws using tooth lock washers.

Otherwise grounding must be ensured by other

action, e.g. cable bridges.

 Attachments such as actuators, position control-

lers, limit switches etc. must satisfy the relevant

safety regulations as regards explosion protection

and, if required, be designed in compliance with

ATEX.

 Special attention must be paid to the appropriate

safety and explosion protection notes in the re-

spective operating manuals.

 Plastic-lined valves must not be operated with

carbon disulphide.

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Richter BVIP/F Series Ball Valves (ISO/DIN) Manuel d'utilisateur Page 7

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