INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Easco Boiler Corp 1175 Leggett Ave Bronx, NY 1047 T: 718.378.3000 F: 718.378.4560 info@easco.com easco.com
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Equipment will be issued a copy of MDR upon EASCO Credit Departments’ determination
of satisfactory account status. Boilers, which are assigned an NB Number, when required
by the Local Jurisdiction having authority, will have an original MDR filed with The NBBPVI,
Columbus, Ohio 43229. A copy of the MDR, along with Installation, Operation and
Maintenance Manual for the Equipment, should always be maintained for inspection and/
or review by Local Jurisdiction, or Authorized Repair Contractor, as necessary.
3.4 Configurations
EASCO offers three types of 3-pass steel horizontal firetube boiler configurations, i.e.,
Scotch Marine (Series FST, ESP, and SM4), Modified Scotch Marine (Series SM5) and
Firebox (Series PLW), and a 4-pass Scotch Marine (Series FPS) configuration, too.
The 3-pass Scotch Marine configuration comprises a cylindrical furnace or combustion
chamber and a reversing chamber of a segmental cross-section, completely submerged
within water contained in the vessel shell, whereby flue gases are reversed into the
second-pass fire tubes towards the front of the boiler. The flue gases are once again
reversed from the front flue gas reversing assembly into the third-pass fire tubes
and accommodated through to the rear flue gas exit assembly whereby Contractor
provided breeching connection is accommodated to safely discharge the products of
combustion. The firetubes used are 2-1/2-in boiler tubes.
The 3-pass Modified Scotch Marine configuration has a small-diameter cylindrical
furnace or combustion chamber and a narrow-width reversing chamber, also completely
submerged within water contained in the vessel shell, a therefore narrow-width firetube
layout pattern, an relatively extended vessel length to compensate the small-diameter
furnace, and similar flue gas passes, in order to fit through a standard 36-in wide doorway
without knocking down wall. The firetubes used are 2-in boiler tubes.
The Firebox Boilers’ basis in design is much like that of the Scotch Marine. However,
in lieu of a completely submerged furnace, or combustion chamber, the combustion
chamber walls and that of the outside shell are flat, thus requiring considerable ‘stays’
to resist the exertion of internal pressure upon the combustion chamber and shell walls.
Furthermore, the firebox floor, being non- water cooled, is refractory lined thus no heat
transfer mechanism is provided for. Both the front combustion chamber and rear-
reversing chamber are water backed. The firetubes used are 3-in boiler tubes.
The 4-pass Scotch Marine configuration, differing from the 3-pass, comprises a furnace
or combustion chamber and a reversing chamber, both fully cylindrical and completely
submerged within the water contained in the vessel shell, whereby flue gases are
reversed into the second-pass fire tubes towards the front of the boiler. The flue
gases are then reversed from the lower chamber of the divided front flue gas reversing
assembly into the third-pass fire tubes towards the rear of the boiler. The flue gases are
then, once again, reversed at rear flue gas reversing assembly into the fourth-pass fire
tubes towards the front of the boiler and, this time, into the upper chamber of the divided
front flue gas reversing assembly, and finally accommodated through gas exit assembly
whereby Contractor provided breeching connection is accommodated to safely discharge
the products of combustion. The firetubes used are 2-1/2-in boiler tubes.
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