The stack temperature of a 4-pass boiler will be lower than the stack temperature of a similar size 2- or 3-pass boiler operating under similar conditions. The 4-pass will have higher efficiencies and lower fuel costs. This is not an opinion. It is basic heat exchanger physics. The 4-pass design yields higher heat-transfer coefficients.

Two-Pass Boiler. Radiant pendant surfaces are located above the furnace, and convective surfaces are arranged horizontally in the second pass. The two-pass heat exchanger configuration results in an efficient furnace height and a lower cost of construction.

The 4 pass Wet-Back boiler ratings for the steam boiler are on Table A2-2 and the 4 pass Wet-Back hot water boilers ratings are on Table A2-4. Dimensions and weights for the 4 pass Wet-Back steam boiler is on Table A2-3. The 4 pass Wet-Back hot water boiler dimension and weights are on Table A2-5.

Industrial Boiler & Mechanical proudly sells new 4 pass firetube boilers manufactured by Johnston Boiler Company. We are also authorized to serivce and repair 4 pass boilers from other manufacturers as well, both on-site and in-house at our facility in Chattanooga, TN.

Author: Bosch Commercial & Industrial It is possible for a 3-pass boiler with a tube design (such as XID boiler tubes) that allows more heat transfer time to deliver the same or higher efficiency rating than a 4-pass boiler with standard tubes. 3 pass firetube boilers offer: maximized heat transfer; minimal refractory; high steam/water storage; effective handling of wide load demands

In 1978, Johnston introduced the first single furnace waterback 4-pass Scotch Marine boiler. Water backed reliability with 4-pass design efficiency? A dream come true. Every Johnston 4-pass maximizes effective heat transfer using a full five square feet of heating surface per BHP, while at the same time eliminating tube sheet stresses and costly maintenance repairs…

EASCO Four pass scotch marine design has higher thermal efficiency, up to 3% more efficient than a 3-pass boiler design. EASCO FPS model is wet back fire tube is designed to increase longevity and enhanced durability, has larger steam space and disengaging area.

Series 4S 4-Pass The Series 4S uses the very latest design techniques and standards. This means it is designed for low volumetric release rates and produces a higher efficiency due to the larger furnace and higher heat transfer design. The 4S is also a great option …

Mohican4-Pass Wetback Firetube Boiler. The Mohican 4-pass wetback boiler is designed for maximum efficiency, reliability and durability in today’s most demanding environments. Mohican 4-Pass Wetback Firetube Boiler can burn: Natural Gas, Propane, #2 Oil, Hydrogen

The Cleaver-Brooks firetube boiler Model 4WI is a 4 pass wetback design including five square feet of heating surface per boiler horsepower, and maximum guaranteed efficiencies. The Model 4WI includes a complete package; pressure vessel, integral burner and controls including

May 16, 2016· On today's episode of The Boiling Point, Gerald and Ritchie address a topic that WARE gets a lot of questions about—the difference between wetback and …