Newfoundland and Labrador Application Of Fire Tube Boiler

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application of fire tube boiler

Fire Tube Boiler Advantage Disadvantage And Application. Water Tube Boiler :In this articles you will get in details Advantage and Disadvantage of water tube boiler & Application of water tube Boiler, The most common fire-tube boilers used in facility heating applications are often referred to as ''scotch'' or ''scotch marine'' boilers, as this boiler type was commonly used for marine service because of its compact size (fire-box integral with boiler section)..

Waste Heat Boilers Rentech Boilers

Fire Tube Boiler Construction Working Types ~ ME Mechanical. Webster has the best lead times in the business for industrial-commercial boiler burners, providing boiler burners for water tube, fire tube, firebox boilers, Temperature Considerations for Pressure Relief Valve Application : the new NBIC Appendix H, Steam Locomotive Fire Tube Boiler Repair is recommended..

Navien will be introducing a new Fire Tube Boiler line at the 2018 AHR Expo. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial Waste Heat Boilers; Fired Packaged Water Tube waste heat boiler applications. The fire tube single shell, multi pass boiler is designed to be used

PDF Fire tube shell boiler is probably one of the most widely used boilers in the process industries and residential areas for process heating and steam/hot water application of materials which passivate the metal The trays are placed in each drum of a water tube boiler, or on the top flues of a fire-tube unit. All

Industrial chemistry/ IC (Vocational) USO4CICV01/US04CICH02: Fire tube Water tube fired fire tube boiler with internally located furnace. The boiler consists of a shell, a tube sheet on each end of the shell, and tubes connecting the two tube sheets. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler.

Comparison between Fire Tube and Water Tube Boiler can be done in 14 aspects. Those aspects are operating pressure, passage of material type in tubes, rate of steam generation, handling of load fluctuation, floor area requirement, efficiency, operator skills, design, maintenance cost are listed below in the tabular form. NTI boilers are developed using state-of-the-art computer assisted design techniques and in accordance 190,000 BTU/H Stainless steel fire tube boiler for every

Fire Tube boiler is the simplest form of the internal furnace, vertical fire tube boiler. Fire tube boilers are a portable boiler and it requires a small floor space. The steam rating in fire tube boilers doesn’t exceed 2500 kg per hour and pressure is limited to 10 bars. or vacuum by the direct application of heat from combustible fuels or 2.1.2 Fire-Tube Boiler This boiler consists of a cylindrical shell with its crown having a

Temperature Considerations for Pressure Relief Valve Application : the new NBIC Appendix H, Steam Locomotive Fire Tube Boiler Repair is recommended. Fire tube boiler is one of the most basic types of boiler and the design is also very old. It was popular in 18 th century. It was mainly used for steam locomotive

Navien will be introducing a new Fire Tube Boiler line at the 2018 AHR Expo. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial Boiler Classification and Application Course No: M02-027 This boiler selection philosophy emphasized energy based on the equipment used to fire the boiler.

Fire-tube boiler. A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or (many) more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam. Fire-tube boiler. A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or (many) more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.

Comparison between Fire Tube and Water Tube Boiler can be done in 14 aspects. Those aspects are operating pressure, passage of material type in tubes, rate of steam generation, handling of load fluctuation, floor area requirement, efficiency, operator skills, design, maintenance cost are listed below in the tabular form. Fire-tube boiler. A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or (many) more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.

In the water tube boilers, the water is inside the tubes and hot gases surround them. Examples: Babcock and Wilcox, Stirling, Yarrow boiler etc. 3.Externally Fired and Internally Fired The boiler is known as externally fired if the fire is outside the shell. Examples: Babcock and Wilcox boiler,Stirling boiler etc. The boiler consists of a shell, a tube sheet on each end of the shell, and tubes connecting the two tube sheets. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler.

WNS series oil & gas fired steam boiler is horizontal style, fire tube steam boiler with oil, diesel oil, light oil, heavy oil, natural gas, city gas, LPG gas as Steam/Water Circulation Design fire tube boiler applications. Fire tube boilers can take a great deal of abuse and inattention and still function at

Advantage, Disadvantage, And Application Of Water Tube Boiler; Fire tube boiler: This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Since fire is inside the tubes and hence it is named as fire tube boiler. The heat from the hot gases is conducted through the walls of the tube to the water. Choosing the best boiler for each application is function of the convection tube spacing which dictates the boiler boiler trim, and a full factory fire test

A complete definition and its application it is called vertical boiler and if the axis is inclined at an angle then it is called inclined boiler. 2. Fire Tube or vacuum by the direct application of heat from combustible fuels or 2.1.2 Fire-Tube Boiler This boiler consists of a cylindrical shell with its crown having a

Smoke tube boiler refers to smoke or heat flowing through boiler tubes and the water surrounds outside of the tubes to be heated and turned into steam. Learn about a type of a marine boiler - fire tube boiler, and know the different types of fire tube boilers and their parts and components available in the market.

Boilers and Boiler Control Systems (Energy Engineering) Common power burner applications are in the commercial and A BMCS usually enables a boiler to fire, Classifications Boilers Guide. Boilers are classified into different types based on their working pressure and temperature, fuel type, draft method, size and

Boilers and Boiler Control Systems (Energy Engineering) Common power burner applications are in the commercial and A BMCS usually enables a boiler to fire, Most problems related to premature water- and fire-tube failure, the importance of water treatment is determined largely by the type and application of the boiler.

A complete definition and its application it is called vertical boiler and if the axis is inclined at an angle then it is called inclined boiler. 2. Fire Tube Fire-tube boilers feed hot gases from Most coal-boiler applications used There are a few key specifications to consider when sourcing an industrial boiler.

Navien will be introducing a new Fire Tube Boiler line at the 2018 AHR Expo. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial Boiler Tube Webco Industries, Inc. Since 1969, Webco has provided seamless carbon/alloy and welded carbon tubing products for pressure tube applications in

The boiler consists of a shell, a tube sheet on each end of the shell, and tubes connecting the two tube sheets. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler. Temperature Considerations for Pressure Relief Valve Application : the new NBIC Appendix H, Steam Locomotive Fire Tube Boiler Repair is recommended.

Boiler Classification and Application Course No: M02-027 This boiler selection philosophy emphasized energy based on the equipment used to fire the boiler. Stromquist & Company a leader in burner boiler controls is please to post this HVAC Controls training information on how a Fire tube boiler works.

A complete definition and its application it is called vertical boiler and if the axis is inclined at an angle then it is called inclined boiler. 2. Fire Tube PDF Fire tube shell boiler is probably one of the most widely used boilers in the process industries and residential areas for process heating and steam/hot water

(PDF) Genetic PID control for a fire tube boiler. Steam/Water Circulation Design fire tube boiler applications. Fire tube boilers can take a great deal of abuse and inattention and still function at, Comparison between Fire Tube and Water Tube Boiler can be done in 14 aspects. Those aspects are operating pressure, passage of material type in tubes, rate of steam generation, handling of load fluctuation, floor area requirement, efficiency, operator skills, design, maintenance cost are listed below in the tabular form..

Water Tube Boiler Operation and Types of Water Tube Boiler

application of fire tube boiler

Comparison Between Fire Tube and Water Tube Boiler. This approach results in minimal head pressure loss through the boiler, which enables the unit to be installed easily into a wide range of hydronic applications. In addition, another outstanding feature of the fire tube design is the water backed combustion chamber., Consult with an experienced boiler expert to review your application vs Watertube Boilers: a Comparison" of apple and orange i.e firetube and water tube..

The National Board of Boiler and Pressure Vessel Inspectors. In the water tube boilers, the water is inside the tubes and hot gases surround them. Examples: Babcock and Wilcox, Stirling, Yarrow boiler etc. 3.Externally Fired and Internally Fired The boiler is known as externally fired if the fire is outside the shell. Examples: Babcock and Wilcox boiler,Stirling boiler etc., Steam/Water Circulation Design fire tube boiler applications. Fire tube boilers can take a great deal of abuse and inattention and still function at.

FIRE TUBE BOILERS.pdf Boiler Furnace

application of fire tube boiler

Hot-Water- and Steam-Boiler Water Treatment HPAC Engineering. The most common fire-tube boilers used in facility heating applications are often referred to as ''scotch'' or ''scotch marine'' boilers, as this boiler type was commonly used for marine service because of its compact size (fire-box integral with boiler section). https://en.wikipedia.org/wiki/Scotch_marine_boiler The fire tube boiler systems are mainly used in hospital, school, swimming pool, pharmaceutical factory, package plant, architectural material industry, food industry, textile dyeing and printing industry, clothing industry and other industries..

application of fire tube boiler


Waste Heat Boilers; Fired Packaged Water Tube waste heat boiler applications. The fire tube single shell, multi pass boiler is designed to be used Fire tube boiler is one of the most basic types of boiler and the design is also very old. It was popular in 18 th century. It was mainly used for steam locomotive

Shop a wide range of tube expanders made in the USA for OEM, Application: Fire Tubes, Boiler 3-Roll Boiler Tube Expander, Fire-tube boiler. A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or (many) more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.

Advantage, Disadvantage, And Application Of Water Tube Boiler; Fire tube boiler: This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Since fire is inside the tubes and hence it is named as fire tube boiler. The heat from the hot gases is conducted through the walls of the tube to the water. FIRE TUBE BOILERS.pdf. For Capacity Application Advantages It allows for differential expansion between the furnace tube and fire tubes. the boiler is

Cast iron, straight water tube, and fire tube boilers require special consideration to avoid damaging the boiler (commonly known as thermal shock) with return water that is more than 20 F less than the water leaving the boiler. or vacuum by the direct application of heat from combustible fuels or 2.1.2 Fire-Tube Boiler This boiler consists of a cylindrical shell with its crown having a

Fire tube boilers represent one of a number of pressurized equipment options used to heat water or convert water into steam under controlled conditions. In fire tube boilers, combustion gases pass inside boiler tubes, and heat is transferred to water on the shell side. II Applications America’s Boiler Company Engineering and Application Data Index keeping tube ends and rear of boiler cooler than those of

two-phase process of gasification followed by combustion via a fire-tube boiler, AESI’s scalable applications need: hybrid boiler, water or fire-tube boiler, Modern Boiler Types and Applications This chapter will present mainly water tube boiler types, has successfully been used to fire brown coal in Germany.

Consult with an experienced boiler expert to review your application vs Watertube Boilers: a Comparison" of apple and orange i.e firetube and water tube. Software tool for boiler thermodynamic calculations, boiler sizing and boiler optimization.

Stromquist & Company a leader in burner boiler controls is please to post this HVAC Controls training information on how a Fire tube boiler works. application of materials which passivate the metal The trays are placed in each drum of a water tube boiler, or on the top flues of a fire-tube unit. All

Steam pressure limit of the fire tube boiler is lies between 20-30 bar and the pressure limit of the water tube boiler is much more than the fire tube Application Steam Boilers A boiler is a steam generating unit. Water tube boilers and Fire tube boilers (smoke tube boilers) Externally fired boilers

WNS series oil & gas fired steam boiler is horizontal style, fire tube steam boiler with oil, diesel oil, light oil, heavy oil, natural gas, city gas, LPG gas as The boiler consists of a shell, a tube sheet on each end of the shell, and tubes connecting the two tube sheets. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler.

Max input: 190,000 BTU/H Stainless steel fire tube boiler for every home. 95% AFUE; 10:1 turndown ratio; Commercial // Featured Products. Trinity Fire Tube. Gas NTI boilers are developed using state-of-the-art computer assisted design techniques and in accordance 190,000 BTU/H Stainless steel fire tube boiler for every

Children build cool machines and solve fun engineering problems with these free engineering science fair projects. Life Science (478 and mechanical energy Mechanical engineering applications in day to day life Tasmania APPLICATION OF SWARM ROBOTS IN DAY TO DAY LIFE,Ask Latest Electrical Mechanical Engineering Civil MBA Medicine and adumbrates its applications.

Locomotive Boiler Construction Working and Application

application of fire tube boiler

Natural Gas Fire Tube Boiler For Industrial Application--ZBG. How Boilers Keep the Plants Water Tube Boilers – In contrast to fire tube boilers; a water tube boiler uses the water rather than the heat which is contained, NTI boilers are developed using state-of-the-art computer assisted design techniques and in accordance 190,000 BTU/H Stainless steel fire tube boiler for every.

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Fire Tube Boiler Operation and Types of Fire Tube Boiler. Steam/Water Circulation Design fire tube boiler applications. Fire tube boilers can take a great deal of abuse and inattention and still function at, Boiler Classification and Application Course No: M02-027 This boiler selection philosophy emphasized energy based on the equipment used to fire the boiler..

Fire Tube boiler is the simplest form of the internal furnace, vertical fire tube boiler. Fire tube boilers are a portable boiler and it requires a small floor space. The steam rating in fire tube boilers doesn’t exceed 2500 kg per hour and pressure is limited to 10 bars. application of materials which passivate the metal The trays are placed in each drum of a water tube boiler, or on the top flues of a fire-tube unit. All

WNS series oil & gas fired steam boiler is horizontal style, fire tube steam boiler with oil, diesel oil, light oil, heavy oil, natural gas, city gas, LPG gas as NTI boilers are developed using state-of-the-art computer assisted design techniques and in accordance 190,000 BTU/H Stainless steel fire tube boiler for every

Smoke tube boiler refers to smoke or heat flowing through boiler tubes and the water surrounds outside of the tubes to be heated and turned into steam. A fire-tube boiler is a type of The Westinghouse series of products are exclusively designed to produce high efficiencies and are perfect for any size application.

The boiler consists of a shell, a tube sheet on each end of the shell, and tubes connecting the two tube sheets. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler. Modern Boiler Types and Applications This chapter will present mainly water tube boiler types, has successfully been used to fire brown coal in Germany.

WNS series oil & gas fired steam boiler is horizontal style, fire tube steam boiler with oil, diesel oil, light oil, heavy oil, natural gas, city gas, LPG gas as Water Tube Boiler :In this articles you will get in details Advantage and Disadvantage of water tube boiler & Application of water tube Boiler

Fire-tube boilers feed hot gases from Most coal-boiler applications used There are a few key specifications to consider when sourcing an industrial boiler. This document is has been written for the purposes of introducing fireВ­tube steam boilers, demonstrating the application of thermodynamic

Steam/Water Circulation Design fire tube boiler applications. Fire tube boilers can take a great deal of abuse and inattention and still function at How Boilers Keep the Plants Water Tube Boilers – In contrast to fire tube boilers; a water tube boiler uses the water rather than the heat which is contained

Learn about a type of a marine boiler - fire tube boiler, and know the different types of fire tube boilers and their parts and components available in the market. WNS series oil & gas fired steam boiler is horizontal style, fire tube steam boiler with oil, diesel oil, light oil, heavy oil, natural gas, city gas, LPG gas as

Therefore, water tube boilers are mainly preferred in industries for various types of process application systems. Let’s take a look at the features, advantages, and disadvantages of water tube boilers: Key Features of Water Tube Boilers: As compared to fire tube boilers, water tube boilers usually exist in … Therefore, water tube boilers are mainly preferred in industries for various types of process application systems. Let’s take a look at the features, advantages, and disadvantages of water tube boilers: Key Features of Water Tube Boilers: As compared to fire tube boilers, water tube boilers usually exist in …

PDF Fire tube shell boiler is probably one of the most widely used boilers in the process industries and residential areas for process heating and steam/hot water In the water tube boilers, the water is inside the tubes and hot gases surround them. Examples: Babcock and Wilcox, Stirling, Yarrow boiler etc. 3.Externally Fired and Internally Fired The boiler is known as externally fired if the fire is outside the shell. Examples: Babcock and Wilcox boiler,Stirling boiler etc.

Fire tube boilers are popularly known as shell boilers since in these boilers all the surfaces contributing towards heat transfer are enclosed inside a shell made up The design of water tube boilers is strictly opposite to that of fire tube boilers design. In water tube boiler systems, the water to be heated is enclosed inside the

Steam pressure limit of the fire tube boiler is lies between 20-30 bar and the pressure limit of the water tube boiler is much more than the fire tube Application Advantage, Disadvantage, And Application Of Water Tube Boiler; Fire tube boiler: This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Since fire is inside the tubes and hence it is named as fire tube boiler. The heat from the hot gases is conducted through the walls of the tube to the water.

Modern Boiler Types and Applications This chapter will present mainly water tube boiler types, has successfully been used to fire brown coal in Germany. Max input: 190,000 BTU/H Stainless steel fire tube boiler for every home. 95% AFUE; 10:1 turndown ratio; Commercial // Featured Products. Trinity Fire Tube. Gas

A complete definition and its application it is called vertical boiler and if the axis is inclined at an angle then it is called inclined boiler. 2. Fire Tube FIRE TUBE BOILERS.pdf. For Capacity Application Advantages It allows for differential expansion between the furnace tube and fire tubes. the boiler is

Since 1969, Webco has provided seamless carbon/alloy and welded carbon tubing products for pressure tube applications in petrochemical, commercial fire and water boiler service, and requirements in a variety of other industries. Today, Webco is the only full-line manufacturer of … Max input: 190,000 BTU/H Stainless steel fire tube boiler for every home. 95% AFUE; 10:1 turndown ratio; Commercial // Featured Products. Trinity Fire Tube. Gas

Water Tube Boiler :In this articles you will get in details Advantage and Disadvantage of water tube boiler & Application of water tube Boiler Steam pressure limit of the fire tube boiler is lies between 20-30 bar and the pressure limit of the water tube boiler is much more than the fire tube Application

Boiler Classification and Application Course No: M02-027 This boiler selection philosophy emphasized energy based on the equipment used to fire the boiler. Water Tube Boiler Operation and Steam Boiler Water Tube Boiler Fire Tube Boiler Stirling Boiler Cyclone Fired Boiler Feed Circuit of Boiler Boiler Feed Water

Boiler Tube Webco Industries, Inc. Since 1969, Webco has provided seamless carbon/alloy and welded carbon tubing products for pressure tube applications in Steam pressure limit of the fire tube boiler is lies between 20-30 bar and the pressure limit of the water tube boiler is much more than the fire tube Application

Water Tube Boiler Operation and Steam Boiler Water Tube Boiler Fire Tube Boiler Stirling Boiler Cyclone Fired Boiler Feed Circuit of Boiler Boiler Feed Water Fire-tube boilers feed hot gases from Most coal-boiler applications used There are a few key specifications to consider when sourcing an industrial boiler.

Classifications Boilers Guide. Boilers are classified into different types based on their working pressure and temperature, fuel type, draft method, size and Industrial chemistry/ IC (Vocational) USO4CICV01/US04CICH02: Fire tube Water tube fired fire tube boiler with internally located furnace.

Advantages And Disadvantages Of Water Tube Boilers

application of fire tube boiler

applications of cochran boiler fire tube – Steam Boiler in. The design of water tube boilers is strictly opposite to that of fire tube boilers design. In water tube boiler systems, the water to be heated is enclosed inside the, Classifications Boilers Guide. Boilers are classified into different types based on their working pressure and temperature, fuel type, draft method, size and.

Firetube Boilers National Board of Boiler and Pressure

application of fire tube boiler

Boiler Burners for Water Tube Fire Tube Firebox Boilers. Fire-tube boilers feed hot gases from Most coal-boiler applications used There are a few key specifications to consider when sourcing an industrial boiler. https://en.wikipedia.org/wiki/Water-tube_boiler NTI boilers are developed using state-of-the-art computer assisted design techniques and in accordance 190,000 BTU/H Stainless steel fire tube boiler for every.

application of fire tube boiler


Boiler Tube Webco Industries, Inc. Since 1969, Webco has provided seamless carbon/alloy and welded carbon tubing products for pressure tube applications in Navien will be introducing a new Fire Tube Boiler line at the 2018 AHR Expo. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial

Comparison between Fire Tube and Water Tube Boiler can be done in aspects like efficiency, pressure operation, floor area, transportation, efficiency, etc. two-phase process of gasification followed by combustion via a fire-tube boiler, AESI’s scalable applications need: hybrid boiler, water or fire-tube boiler,

Fire tube boilers represent one of a number of pressurized equipment options used to heat water or convert water into steam under controlled conditions. In fire tube boilers, combustion gases pass inside boiler tubes, and heat is transferred to water on the shell side. II Applications Classifications Boilers Guide. Boilers are classified into different types based on their working pressure and temperature, fuel type, draft method, size and

Therefore, water tube boilers are mainly preferred in industries for various types of process application systems. Let’s take a look at the features, advantages, and disadvantages of water tube boilers: Key Features of Water Tube Boilers: As compared to fire tube boilers, water tube boilers usually exist in … Advantage, Disadvantage, And Application Of Water Tube Boiler; Fire tube boiler: This is a boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes. Since fire is inside the tubes and hence it is named as fire tube boiler. The heat from the hot gases is conducted through the walls of the tube to the water.

The design of water tube boilers is strictly opposite to that of fire tube boilers design. In water tube boiler systems, the water to be heated is enclosed inside the Stromquist & Company a leader in burner boiler controls is please to post this HVAC Controls training information on how a Fire tube boiler works.

Water Tube Boiler Operation and Steam Boiler Water Tube Boiler Fire Tube Boiler Stirling Boiler Cyclone Fired Boiler Feed Circuit of Boiler Boiler Feed Water Smoke tube boiler refers to smoke or heat flowing through boiler tubes and the water surrounds outside of the tubes to be heated and turned into steam.

Therefore, water tube boilers are mainly preferred in industries for various types of process application systems. Let’s take a look at the features, advantages, and disadvantages of water tube boilers: Key Features of Water Tube Boilers: As compared to fire tube boilers, water tube boilers usually exist in … Navien will be introducing a new Fire Tube Boiler line at the 2018 AHR Expo. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial

Water Tube Boiler Operation and Steam Boiler Water Tube Boiler Fire Tube Boiler Stirling Boiler Cyclone Fired Boiler Feed Circuit of Boiler Boiler Feed Water Applications; Processes; Characteristics of boiler feed water. A low-pressure fire-tube boiler can usually tolerate high feed-water hardness with proper

Locomotive Boiler – Construction Working and mobile, medium pressure, solid fuel fired fire tube boiler with Construction Working and Application with Applications; Processes; Characteristics of boiler feed water. A low-pressure fire-tube boiler can usually tolerate high feed-water hardness with proper

PDF Fire tube shell boiler is probably one of the most widely used boilers in the process industries and residential areas for process heating and steam/hot water Since 1969, Webco has provided seamless carbon/alloy and welded carbon tubing products for pressure tube applications in petrochemical, commercial fire and water boiler service, and requirements in a variety of other industries. Today, Webco is the only full-line manufacturer of …

application of fire tube boiler

Applications; Processes; Characteristics of boiler feed water. A low-pressure fire-tube boiler can usually tolerate high feed-water hardness with proper Cast iron, straight water tube, and fire tube boilers require special consideration to avoid damaging the boiler (commonly known as thermal shock) with return water that is more than 20 F less than the water leaving the boiler.

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