Engineering FAQ 1 / 5
Engineering FAQ
Boiler specifications
A-8-01
Typical questions and answers on the boiler
specifications on tender and boiler contract documents
Burner
General:
Q.
Burner and burner safeguards shall comply with the CGA Gas
codes.
A.
Our boiler controller (flame safety and water level
control) comply with UL and c-UL.
Q.
Burner control devices and control sequence shall comply
with the requirements of Factory Mutual.
A.
Yes. Request on PO.
Q.
The turndown ratio for the burner shall be at least 4:1
A.
No, our turn down ratio is usually 2:1 for EX and depends
on model for LX. Refer to A-1 for details.
Oil burner:
Q.
Oil burners shall be:
- pressure atomizing forced draft type.
A.
yes
Q.
Oil burners shall be complete with
-Built-in blower to supply combustion air, complete with
motor, silencer and damper
A.
yes except the silencer(need details of what they need).
Silencer is optional.
Q.
-with stainless steel flame retention diffuser
A.
Yes
Q.
- Oil pump complete with integral relief valve
A.
oil pump has internal recirculation or external return to
the tank (depends on model)
Q.
-Oil filter
A.
yes, it comes as standard
Q.
- Pressure gauge
A.
yes, gauge is standard on the pressure side of the pump.
Q.
-High voltage ignition transformer
A.
yes only for EX(H)(W)-100. Other models have gas pilot
as ignition means.
Q.
- Flame observation port
A.
yes, it comes as standard.
Q.
- Easy access to nozzles and electrodes
A.
yes, we can say that.
Q.
- Fuel and air modulating controls for maximum burner
efficiency throughout operating range
A.
No, our burner is off-low-high step fire control.
Q.
-Oil atomizer utilizing air blower
A.
No, our oil atomizer uses the oil pressure itself to
spray the oil, and mixes with air supplied by the blower.
A-8-01
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May 2009
Engineering FAQ
Q.
A.
- electric oil heater to heat fuel oil from - 48°C to 0°C
No, our burner is designed for #2 fuel oil, which does
not need the heater for proper combustion. In cold
region or season, the oil supplier usually provides #2
oil arranged for use in cold conditions.
Gas burner
Q.the burner shall be complete with gas train including
-lubricated type manual shut off cock on the gas train
A.
No, our gas train has ball type manual shut off valve.
Q.
-automatic gas vent valve
A.
automatic gas vent is not standard for boilers 200BHP and
below. 250 and 300BHP boilers have that, but it is not
required by code we comply with.
Q.
-Main gas safety shutoff valves
A.
Yes, we have two safety shutoff valves (both UL listed as
safety shutoff valve)
Q.
-high and low gas pressure switches
A.
Yes, our boiler has both high and low gas pressure
switches as standard.
Q.
-Main manual gas shutoff and leakage test cocks
A.
Main manual gas shutoff valve is standard, and leakage
test cocks are optional as “CDS-1 option”.
Q.
-gas pressure regulators
A.
Standard. Except for LX50-07 which has the gas
regulating function integrated in the valve.
Q.
-Air safety switch
A.
Air pressure switch is standard
Q.
-Electronic annunciating combustion safety control with UV
sensor.
A.
Our BL combustion safety control includes display and
lamps for status and errors.
Q.
-Automatic gas valve
A.
main and pilot gas valves are automatic
Q.
-Adjustable cam gas metering valves.
A.
No, we can monitor gas flow using gas orifice
differential pressure.
Pilot burner
Q.
-gas pressure regulators
A.
Standard
Q.
-Pilot solenoid valve and shutoff cock
A.
Yes, the pilot gas train has 2 safety shutoff valves and
manual shutoff cock.
Q.
-gas pilot assembly and ignition transformer
A.
Yes, but except EX(H)(W)100-O. for 100BHP oil burner,
the burner is spark direct ignition.
A-8-01
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May 2009
Engineering FAQ
Boiler
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A-8-01
Boiler pressure vessel shall conform to ASME section .
Our boiler pressure vessel has S stamp =
ASME section
or H stamp = ASME Section IV.
ASHRAE/IESNA 90.1 Compliance: Water-tube boilers shall have
minimum efficiency according to Table 10-8.
Our boiler efficiency conform to such minimum efficiency
requirement.
Design, documentation, fabrication and testing shall comply
with ASTM, ANSI, CGA, ULC standards and TSSA requirements.
CGA / CSA = boilers are no longer labeled with these
approvals because they are equivalent to UL/c-UL, ULC =
boilers will be either labeled UL and c-UL, and not ULC.
boiler water tubes shall be made of ASME SA-106-B.
Now, main models uses SA-178-A, and some still uses SA106-B.
Boiler should include the following trim:
-NEMA 250 type 1 control box
Our boiler is a “packaged boiler” including the boiler
control panel, and the entire boiler is UL listed. In
this case, the NEMA control box is generally not required.
Our control box is following the strict rules in the UL
codes.
-Steam pressure gauge with 6” dial:
We do have one pressure gauge but 4”. And also pressure
display on the controller.
-Pressure control operator.(Modulating)
Yes, we have BL(or XJ-1) pressure control as well as the
backup pressure control switch from Honeywell as standard.
However, it is not modulating as itself.
-Pressure high limit safety control.
Yes, we have high limit safety switch as standard.
-Water gauge glass
No, our boiler type is exempt from gauge glass
requirement in the ASME code.
-Low-Water Cutoff Switch: Manual reset type. External
column mounted float type.
We have the low water cutoff as standard (code
requirement) = manual reset, external column mounted, but
electrode type (not float type)
-Auxiliary low water cutoff
Yes, we have it as standard = auto reset.
-feed pump control
Yes, we have it as standard included in the BL(or XJ-1).
-ASME safety valve(s)
Yes, we have 1 or 2 (quantity depends on ASME requirement
and design) safety valve(s) on the boiler pressure vessel
as standard.
-Auxiliary contacts for start/stop and alarm indication
we can supply some dry contacts for monitoring purpose
-Alarm Bell: Factory mounted on control panel with silence
switch.
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May 2009
Engineering FAQ
A.
Q.
A.
Q.
A.
Q.
A.
Q.
A.
Q.
A.
yes
-Provide electronic programming relay, feedwater pump and
blower motor starter control switches, control circuit
transformer and alarm bell.
all included.
-selector switch to permit only low fire.
not included for BL boilers. Low fire hold only in the
test mode.
Jacket: Sheet metal, with screw-fastened closures and
baked-enamel protective finish.
Our boiler is installed with painted sheet metal casings.
(not “baked” paint)
Mounting base to secure boiler to concrete base
Yes
Two bottom blow valves (one slow and one quick opening, or
two slow opening)
standard boiler includes one quick or slow opening valve.
One additional slow opening valve is optional.
Economizer
Q.
A.
Q.
A.
Q.
A.
Q.
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Q.
A.
A-8-01
Provide an economizer for each of the steam boilers. The
economizers shall be gas to liquid heat exchangers,
designed to utilize heat in the boiler flue gasses to
preheat boiler feedwater.
Yes.
Tube material shall be SA-178-A boiler tube
economizer water tubes are all SA-106-B boiler tube.
Tube size is 1” SCH40.
Provide economizer with safety valve.
on boilers for US market, the economizer is made under
ASME section 1 and it is part of the boiler. The safety
valve on the main pressure vessel protects the economizer
from excessive pressure.
On some boilers for Canadian market, the economizer is
made under ASME section 8, and considered as a separate
pressure vessel. In this case, the economizer is
equipped with a pressure relief valve.
Provide economizer with automatic soot blower
Our boiler is intended for fuel gas and #2 oil and the
deposit of soot is relatively small. That is why we do
not need the soot blower. In case of economizer cleaning,
we can open the box and clean the vessels easily for EX
models.
Provide additional feed water controls as required to
ensure proper economizer operation.
Economizer feed water control is combined with the boiler
water control (feed water to the boiler = feed water to
the economizer). With BL control, we have one additional
control to prevent the water to boil in the economizer.
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May 2009
Engineering FAQ
Ancillary
Q.
Boiler shall use propane as a backup fuel.
A.
Propane backup fuel is optional only for some LX models.
Q.
Barometric Damper: Galvanized-steel assembly with flue-gas
thermometer having a minimum 90 mm diameter dial.
A.
Barometric damper is not supplied by our factory.
Consult chimney installer when required.
Q.
Silencer to reduce the noise to 80dB or below
A.
Air inlet silencer is optional. It can reduce the noise
from 85dB to 80dB.
Revision Record:
Rev.
Date
00
01
A-8-01
May 2009
Apr. 2011
Content of change
Related
docs
New content
Amendments to section “Boiler”
5/5
Revised
by
T.F.
K.S.
May 2009
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