disconnected and removed from the channel. Lamp connection shall
be above the waterline or shall be waterproof. Safety interlock
switch shall turn off power to the lamps when module enclosure
covers are opened. A Class B, ground fault circuit interrupter
shall be provided for each enclosure to turn off power if water
enters the enclosure. Lamps shall be arranged so that they can be
replaced without disassembling or removing lamp module.
d.
System shall allow for complete system shutdown or by-pass.
System shall allow continuous disinfection while replacing lamps,
sleeves, and ballasts; and while cleaning the lamp sleeves.
e.
Individual lamp modules weighing 25 kg 55 pounds or less shall be
removable without requiring mechanical lifting devices. Systems
with individual lamp modules weighing over 25 kg 55 pounds shall
be provided with a mechanical lifting device as [specified]
[shown].
2.2.4.2
UV Lamps
a.
Lamp shall be low-pressure mercury vapor type of the hot-cathode,
instant-start design in which the coiled filamentary cathodes are
heated by the arc current. The filament shall be a clamped
design, and shall withstand shock and vibration.
b.
Lamp shall have the following characteristics:
(1) 90 percent of UV radiation shall be within the wavelengths of
233.7 to 273.7 nm.
(2) Produce a minimum UV intensity of 190 microwatts per square
cm at a distance of 1 meter.
(3) Maximum power input of 65 watts (not including ballast
losses).
(4)
Have a minimum arc length of 1475 mm 58 inches.
(5)
Rated to produce zero levels of ozone.
(6)
Have a minimum UV output of 26.7 watts at 100 hours.
c.
Lamp base shall be metal and ceramic, resistant to UV light and
ozone. Lamp tube shall be capable of transmitting 90 percent of
d.
Changing lamps shall not require removal of the sleeve from the
lamp module frame. Lamp ballast shall be capable of being
replaced by plant operating personnel.
e.
System shall use lamps available from at least 2 currently active
lamp manufacturers without modifications to the system.
2.2.4.3
UV Lamp Sleeve
a.
Sleeve shall be clear fused quartz circular tubing. Sleeve shall
be rated for transmittance of 89 percent or more and sleeve shall
not be subject to solarization over its life. The nominal wall
thickness shall be between 0.8 and 2.09 mm 20 and 53 inches.
SECTION 11376
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