the front panel operator adjustable trip point.
5.
Calibration adjustment.
6.
Timer for adjustment of intervals between sampling periods.
c.
One prepiped blowdown piping assembly installed in each boiler
surface blowdown line shall be provided. Assembly shall consist
of:
1. Shut-off valve 20 mm 3/4 inch rated for system operating
pressure and temperature.
2.
Conductivity probe.
3. Normally closed motorized flow control valve [[20 mm 3/4 inch]
rated for system operating pressure of [1150 kPa 150 psig] and
temperature up to [200 degrees C 400 degrees F]] [_____].
4. Throttling valve [20 mm 3/4 inch] [_____] rated for system
operating pressure and temperature.
5.
Temperature compensation probe.
2.11
CHEMICAL FEED SYSTEM
Chemical feed system shall be provided for steam and condensate chemical
treatment consisting of introduction of chemical solutions into deaerator,
boiler and boiler feedwater lines. Chemical feed system shall be automatic
proportioning pump type for single or multiple boiler installation and
shall consist of pumps, tank, piping, control and accessories. Chemical
feed system shall be completely preassembled package, factory tested,
hydraulically and electrically, and shall be furnished with required
special tools, lubricants, and installation instructions. Chemical feeding
and control equipment shall be provided for the following:
a.
For each boiler:
(1)
Boiler scale inhibitor and antifoaming chemical treatment.
(2)
Alkalinity supplement.
(3)
Neutralizing amines.
b.
For deaerator feedwater condensate return systems: chemical
treatment consisting of oxygen scavenger such as sodium sulfite.
Chemical treatment manufacturer shall provide a 1 year supply of chemicals.
Chemical products shall be compatible with system materials of construction
and operating conditions and shall comply with all applicable regulatory
agencies. The chemical feeder shall be interlocked with boiler and
deaerator operation.
2.11.1
Chemical Feed Pump and Tank
Chemical feed pump and tank shall be provided as indicated. Chemical feed
pump and tank shall be a package with pump mounted and piping connected to
the tank. Chemical feed pump capacity shall be as indicated. Chemical
feed pump shall be positive displacement metering type. Chemical feed pump
SECTION 15561A
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