Cryogenic Valves
2
C47C, FC47C, FC47W
2. SIL
Under normal operating conditions the Habonim valve should be
inspected for proper functioning and signs of deterioration every
50,000 cycles or 6 months (whichever comes first). Under severe
operating conditions inspection should be more frequently; detected
defects should be repaired promptly.
Severe operating conditions can be defined as:
•
Application temperature less than -20 deg C
•
Application temperature higher than +230 deg C
•
Flow velocity higher than 5 m/sec for liquids, and 200 m/sec
for gaseous
•
Acidic media PH < 5 or alkaline media PH > 9
Habonim recommend a proof test interval of 12 months; in case of
Fail to Open ESD system, a partial stroke is acceptable to confirm
that the installation is functioning properly.
For ESD systems with a Fail-To-Close demand, it is necessary to
plan a system shut-down; de-energize the system and inspect the
valve turning to its fully closed position.
It is essential to log-in the following parameters on site QA records
as a proof for preserving SIL capabilities: date, hour, name and
signature of the responsible engineer, air pressure on site, time to
close the valve, time to open the valve.
Habonim recommend valve full maintenance operation every
500,000 cycles or 4 years, whichever comes first (refer to Para. 7 in
this IOM for maintenance instructions). The combined corrosion and
erosion allowance for the valve body wall thickness is 1 mm. When
this allowance has been eroded or corroded, mechanically removed
or otherwise, the valve should no longer be used. Inspect the valve
wall thickness every time the valve is maintained.
The estimated mean time to repair (MTTR) a valve, i.e. time net
(line draining or cooling down time excluded from the valve MTTR)
of replacing old valve with a new one is 60 minutes. Maintenance
team must read and understand the Habonim product IOM before
starting the operation. In case of a doubt please consult the Habonim
engineering team.
When a valve has been repaired or any maintenance was performed,
check the valve for proper function (proof testing). Any failures
affecting functional safety should be reported to the Habonim factory.
Client should consult the Habonim factory in order to obtain the
product assessment, FMEDA report, and other associated statistical
data to satisfy SIL level.
Special condition for safe use
When connected to an actuator the maximum rubbing speed of any
component within the valve must not exceed 1ms-1.
3. LIMITATIONS
The correct selection of materials of construction, seats and seals,
internal valve components and pressure/temperature ratings
determines the safe use of the valves and the particular performance
requirements for the application. This information can be found on
the nameplate welded to the valve body.
The combined corrosion and erosion allowance for the valve body
wall thickness is 1 mm. When this allowance has gone, the valve
should no longer be used. Inspect the valve wall thickness every
time the valve is maintained. Refer to Habonim Corrosion Data
Chart T-614 to determine the corrosion rate for your application.
As the variety of applications these valves can be used in is large,
it is impossible to cover all installation and maintenance instructions
for servicing the valves. It is the owner's responsibility to use the
valves as recommended and in accordance with the pressure and
temperature limits as stated in this manual. Where in doubt, please
consult with Habonim.
Any unstable fluid or gas should be identified by its manufacturer
and must not be used with Habonim valves.
CAUTION:
The valves should be used in a well designed, adequately protected
system to ensure that pressure and temperature limits are not
exceeded.
Valve surface temperature may become extremely cold due to
operating conditions. Prevent any type of direct contact with the
valve that may harm the workers.
The valves should be used in a well designed, adequately supported
piping system such that it will not be subjected to undue forces or
hydraulic shocks during service.
The valves are not designed to operate during or after earthquakes
or under fatigue conditions. It is the responsibility of the owner to
determine if fatigue conditions exist.
4. STORAGE
Prior to storage, inspect the valve for shipping damage. The valves
are individually packed in a hermetically sealed polyethylene bag
filled with dry nitrogen. It is recommended to keep the valves in their
bags and in a clean and protective environment until ready for use.
Keep all protective packaging, flange covers and end caps attached
to the valves during storage.
5. LONG TERM STOREAGE
5.1.
It is advisable to store the valves in waterproof conditions.
Ball valves should be protected to safeguard against
humidity, moisture, dust, dirt, sand, mud, salt spray, and sea
water.
5.2.
Manual ball valves must remain in the open position during
the period of storage.
5.3.
Actuated valves (fail to close position) remain in closed
position during this time.
5.4.
Valves may be stored as shipped, provided the above
storage location and equipment orientation instructions are
followed
5.5.
In order to prevent damage, protective covers on valve ends
should not be removed until immediately prior to installation.
5.6.
Visual inspection should be performed on a semi-annual
basis and results recorded.
5.7.
If the actuated valve (fail to close position) is planned for
long storage after dispatch it will be necessary to operate
