ATEX UNLOADER AND RELIEF VALVES
SAFETY NOTE
SN03
Rev. 00
Date 27/10/2020
Pag. 8 of 10
Ambient risks
Ambient conditions different than those specified can cause a danger source.
They can cause dangerous service conditions (with relation to the processed fluids) an abrupt movement, humidity
effects, ambient temperatures and pressure changes, chemical agents, corrosion.
The working process in the installations must be carried out in such a manner to be not determined by a dangerous
influence.
Refrain from the functioning of the valve in case of evident irregularities. The rupture of some components provokes a
non-hydrokinetic function of the valve.
3.4.5 PPE (PERSONAL PROTECTIVE EQUIPMENT) & PROCEDURES TRAINING
The choice of PPE (Personal protective equipment) is user’s responsibility according to the local safety regulation,
predicting the following residuary risks:
Hot surface temperatures
Electrostatic charges
Infiammable liquids, noxious substances, etc
Others in relation to type of use
The use of the valve must foresee a precise training formation.
It is necessary to pertain to the application of the local safety regulation.
3.5 SYSTEM PROCEDURES
3.5.1 TOOLS & MACHINERY
The safety of the system is also in function with control devices (conform with Directive 2014/34/EU) which must be
absolutely independent from the valve.
3.5.2 LOAD & UNLOAD
Adequate means are foreseen for the draining and leakage in order to consent the cleaning operations, inspection and
maintenance in absolute safety conditions.
3.5.3 START & STOP
In case of doubt and an irregular function, stop the productive process, do not make brief repairs and ask qualified
personnel.
3.6 INSPECTION, ORDINARY & EXTRAORDINARY MAINTENANCE, SERVICE & CLEANING
3.6.1 PRECAUTIONS
Before proceeding to the periodic procedures of inspection, maintenance, repairs & cleaning it is necessary to
discharge the internal pressure, through a duct converged in a safe area, to avoid damage to persons or things and
to verify the occurred discharge phase by means of control devices (pressure gauges).
