Bedienungsanleitung Sogo SS-1287 (Seite 27 von 88) (Deutsch, Englisch, Französisch, Italienisch, Portugiesisch, Spanisch)

798726

Zoom out

Zoom in

Vorherige Seite

1/88

Nächste Seite

español english français portuguese deutsch italiano

CABLING

REPAIRS TO SEALED COMPONENTS

DETECTION OF FLAMMABLE

REFRIGERANTS

LEAK DETECTION METHODS

REMOVAL AND EVACUATION

REPAIR TO INTRINSICALLY SAFE

COMPONENTS

1) During repairs to sealed components, all

electrical supplies shall be disconnected from

the equipment being worked upon prior to any

removal of sealed covers, etc. If it isabsolutely

necessary to have an electrical supply to

equipment during servicing, then a permanently

operating form of leak detection shall be located at

the most critical point to warn of a

potentially hazardous situation.

2) Particular attention shall be paid to the following

to ensure that by working on electrical

components, the casing is not altered in such a

way that the level of protection is affected

This shall include damage to cables, excessive

number of connections, terminals not made to

original specification, damage to seals, incorrect

fitting of glands, etc

Ensure that apparatus is mounted securely.

Ensure that seals or sealing materials have not

degraded such that they no longer serve the

purpose of preventing the ingress of flammabl

atmospheres. Replacement parts shall be in

accordance with the manufacturer’s specifications

NOTE: The use of silicon sealant may inhibit the

effectiveness of some types of lea

detection equipment. Intrinsically safe components

do not have to be isolated prior to working

on them.

Do not apply any permanent inductive or

capacitance loads to the circuit without ensuring

that this will not exceed the permissible voltage

and current permitted for the equipment

in use.

Intrinsically safe components are the only types

that can be worked on while live in the

presence of a flammable atmosphere. The test

apparatus shall be at the correct rating.

Replace components only with parts specified by

the manufacturer. Other parts may

result in the ignition of refrigerant in the atmosphere

from a leak.

Check that cabling will not be subject to wear,

corrosion, excessive pressure, vibration,

sharp edges or any other adverse environmental

effects. The check shall also take into

account the effects of aging or continual vibration

from sources such as compressors or fans.

Under no circumstances shall potential sources of

ignition be used in the searching for or

detection of refrigerant leaks. A halide torch (or any

other detector using a naked flame

shall not be used.

The following leak detection methods are deemed

acceptable for systems containing

flammable refrigerants

Electronic leak detectors shall be used to detect

flammable refrigerants, but the sensitivity may

not be adequate, or may need re-calibration.

(Detection equipment shall be calibrated in a

refrigerant-free area.) Ensure that the detector is

not a potential source of ignition and is suitable

for the refrigerant used. Leak detection equipment

shall be set at a percentage of the LFL of the

refrigerant and shall be calibrated to the refrigerant

employed and the appropriate percentage of gas

(25 % maximum) is confirmed

Leak detection fluids are suitable for use with

most refrigerants but the use of detergents

containing chlorine shall be avoided as the

chlorine may react with the refrigerant and corrode

the copper pipe-work.

If a leak is suspected, all naked flames shall be

removed/ extinguished.

If a leakage of refrigerant is found which requires

brazing, all of the refrigerant shall be recovered

from the system, or isolated (by means of shut

off valves) in a part of the system remote from the

leak. Oxygen free nitrogen (OFN) shall then be

purged through the system both before and during

the brazing process.

When breaking into the refrigerant circuit to make

repairs – or for any other purpose – conventional

procedures shall be used. However, it is important

that best practice is followed since flammability is

a consideration. The following procedure shall be

adhered to:

• Remove refrigerant;

• Purge the circuit with inert gas;

• Evacuate;

• Purge again with inert gas;

• Open the circuit by cutting or brazing.

The refrigerant charge shall be recovered into the

correct recovery cylinders. The system shall be

“flushed” with OFN to render the unit safe. This

process may need to be repeated several times.

Compressed air or oxygen shall not be used for

this task.

Flushing shall be achieved by breaking the vacuum

in the system with OFN and continuing to fill until

the working pressure is achieved, then venting to

atmosphere, and finally pulling down to a vacuum.

This process shall be repeated until no refrigerant

is within the system. When the final OFN charge

is used, the system shall be vented down to

atmospheric pressure to enable work to take

place. This operation is absolutely vital if brazing

operations on the pipe-work are to take place.

Ensure that the outlet for the vacuum pump is not

close to any ignition sources and there

is ventilation available.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Sogo SS-1287 Seite 27

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info