FIRE 01 10 24 - Flipbook - Page 9
AVK dry barrel fire hydrants series 27
The UL 246 standard for hydrants for fire
protection service:
Same as mentioned under series 24.
The UL 246 approval tests include a 10-day
moist ammonia air stress cracking test, testing
of rubber parts according to UL 157 and tests of
operation, leakage and head loss.
FM class number 1510:
Shell strength is tested by a pressure of four
times the working pressure lasting for five
minutes, and after the test there should be no
evidence of damage. The standard also includes
testing seat leakage at two times working
pressure for five minutes without damage or
leakage to be seen.
Furthermore, hose outlet strength, stem
strength and head loss are tested, and finally,
the breakable system is tested by a pressurized
hydrant (at maximum working pressure) being
hit with a force sufficient enough to break. After
separation, the hydrant must have a leakage
of maximum 19 dm³/min while pressure is
maintained for two minutes.
AVK post indicators series 34
UL 789 standard for indicator posts for fire
protection service:
These requirements cover indicator posts,
including wall and underground types, for use in
operating valves of the inside-screw pattern and
for indicating the position of the gates in such
valves. Indicator posts are primarily intended
for use with valves controlling water supplies
to sprinkler, deluge, water spray, foam, and
standpipe systems used in private fire service
where connections enter buildings.
The UL 789 standard includes test of rotating and
moving target mechanisms of position indicators
and performance tests involving a 1,000 cycle
operation test of polymeric parts.
FM class number 1110:
Visibility of the indicator is tested on a 12 meter
distance and by simulating a heavy rainstorm it
is waterproof tested to make sure that there is no
collection of water inside.
AVK gate valves series 45, 55 and 145
UL 262 standard for gate valves for fire
protection service:
These requirements cover gate valves intended
for installation in piping systems supplying water
for fire protection service.
The UL 262 standard includes a 10-day moist
ammonia air stress cracking test, test of rubber
parts according to UL 157, test of coating for
seating surfaces and corrosion test for stems.
FM class number 1120 and 1130:
The valve body, cover and bonnet are subjected
to a hydrostatic test of four times working
pressure (or at least 48 bar) for five minutes
and there should be no sustaining cracking or
permanent distortion.
Stem seal leakage is tested on a partially open
valve subjected to working pressure for five
minutes. No visible stem leakage must appear.
Both resilient and metal seats are also leakage
tested.
Furthermore, rubber parts are tested for water
absorption, corrosion protection coating, aging
and bonding adequacy and the strength of gate,
stem seal, indicator post and handle are tested.
AVK butterfly valves series 75 (indicating
valves)
FM class number 1112
Disc strength is tested at two times working
pressure held for five minutes and repeated for
both directions. Hydrostatic strength is tested
at a hydrostatic pressure of four times working
pressure (or at least 48 bar) for five minutes. No
visible rupture, cracking or permanent distortion
of the valve body must be seen.
Seat leakage is tested at working pressure and at
125% of working pressure for five minutes each.
If there is any leakage, this should be compared
to the allowed limits based on the seat type. The
stem seal leakage is tested at working pressure
in partially open position for five minutes, and
cycling the disc six times during this time span,
with no visible stem leakage allowed.
Furthermore, the FM standard also dictates tests
of valve assembly strength, ultimate operator
torque, durability, close quarters durability
(butterfly type), friction loss determination, water
hammer, indicator strength, water absorption,
aging, corrosion protection coating and much
more.
AVK check valves series 5190
AVK series 5190 products for fire protection meet
the UL 312 standard. The products 5190/10-001
and 5190/20-001 are furthermore approved
according to the FM 1210 standard.
UL 312 Standard for check valves for fire
protection service:
These requirements cover check valves DN25
and larger, used in piping systems supplying
water for fire protection service. The UL 312
approval tests include a cycling performance test,
testing of rubber parts, adhesion test for resilient
seat materials and leakage test.
FM class number 1210:
The valve is subject to a cycle test of 50,000
cycles, no more than six cycles per minute. The
test is carried out at atmospheric pressure and
no excessive wear, damage or failure of any valve
component must occur. Seat leakage tests are
performed on resilient seat and metal-to-metal
seats. For the resilient seat, no leakage is allowed
during test with hydrostatic pressure of 2, 6.8
and 12 bar (and working pressure if higher than
12 bar) for five minutes each.
For the metal-to-metal seat, leakage must not
exceed a value of approximately 11.8 ml/hour per
centimeter of nominal valve size when subjected
to 2, 6.8 and 12 bar (and working pressure if
higher than 12 bar) for five minutes each.
In addition, clapper strength, hydrostatic strength,
friction loss determination, bonding adequacy,
water absorption and aging are also tested
according to FM 1210 standards.
A vertical indicator post should withstand 1220
Nm in both directions (for valves up to 350mm) –
the value is 815 Nm for a wall type indicator post
(up to 250mm).
Finally, non-metallic components are tested for
resistance to temperatures as high as 427°C for
two hours. After being cooled down again, the
indicator post should be capable of full operation.
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