Bryan Boilers Forced Draft Steam Boilers User Manual download pdf (Page 9)

TABLE 1.8.1C: ESTIMATING FLUE GAS EMISSIONS

Estimated Emissions (Volumetric Flow Rate Per Million Btu/hr Input)

(Multiply PPH listed times boiler input divided by 1,000,000)

BOILER

TYPE

PARTICULATES NOx CO SOx Hydrocarbons

PPH per

MMBH

PPM

PPH per

MMBH

PPM

PPH per

MMBH

PPM

PPH per

MMBH

PPM

PPH per

MMBH

PPM

Gas Fired

Oil Fired

N/A

0.020

N/A

0.049

0.068

0.194

0.018

200

N/A

0.286

N/A

290

0.010

0.004

1.8.2 CLEARANCES

The vent system and draft control devices must

be installed so as to achieve the clearances to

surfaces outlined in Table 1.2.1, Minimum

Clearances chart, in this manual. See also Table

1.8.9 for vent clearances. All clearances must

comply with the National Fuel Gas Code

(NFPA54), and with all

local and state building codes. The clearances

described in this manual are intended to be

general guidelines only, additional requirements

may occur because of local building design

regulations.

1.8.3 BOILER ROOM PRESSURIZATION

The boiler room must be supplied with adequate

air for combustion and for proper operation of

draft control devices (barometric dampers or draft

diverters) as outlined in "Combustion Air Supply",

Section 1.7 of this manual.

WARNING

THE BOILER ROOM MUST BE MAINTAINED

AT A POSITIVE OR NEUTRAL PRESSURE

(RELATIVE TO OUTDOORS) AT ALL TIMES.

EXHAUST FANS OR CONNECTIONS FROM

THE BOILER ROOM TO ZONES OF NEGATIVE

PRESSURE (AIR DUCTS, NEGATIVE

PRESSURE ROOMS, ETC.) WILL CAUSE

NEGATIVE PRESSURE IN THE BOILER

ROOM. SUCH CONDITIONS WILL CAUSE

HAZARDOUS OPERATION OF THE BOILER

AND INTRODUCTION OF COMBUSTION

PRODUCTS INTO THE BUILDING AIR.

IF THE BOILER ROOM MUST BE UNDER A

NEGATIVE PRESSURE AT ANY TIME, AN

INDUCED DRAFT FAN WILL BE REQUIRED.

FURTHER, THE BOILER MUST BE PROVIDED

WITH A BAROMETRIC DRAFT CONTROL -

NOT WITH A DRAFT DIVERTER. THE FAN

MUST BE INTERLOCKED WITH THE BOILER

AND A DRAFT PROVING SWITCH MUST BE

INSTALLED TO PREVENT OPERATION OF

THE BOILER IF THE FAN SHOULD FAIL TO

OPERATE.

IT ALSO MAY BE ADVISABLE TO INSTALL AN

AUTOMATIC VENT DAMPER IN THE VENT

SYSTEM TO PREVENT BACKFLOW

THROUGH THE VENT SYSTEM DURING

BOILER OFF CYCLES. SEE FOLLOWING

SECTION ON AUTOMATIC VENT DAMPERS.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 36 37

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Bryan Boilers Forced Draft Steam Boilers User Manual Page 9

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