How to Destroy a Boiler -- Part 2

How to Destroy a Boiler -- Part 2. Summary: The following article is a part of National Board Classic Series and it was published in the National Board BULLETIN. (4 printed pages) William L. Reeves, P.E President, ESI Inc. of Tennessee. Category: Incidents Summary: The following article is a part of the National Board Technical Series. This article was originally published in the Summer 1999

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Marine auxiliary machinery

Distillation is the production of pure water from sea water by evaporation and re-condensing. Distilled water is produced as a result of evaporating sea water either by a boiling or a flash process. This evaporation enables the reduction of the 32000 parts per million of dissolved solids in sea water down to the one or two present in distilled

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Scaling in boilers - Lenntech

Boiler scale is caused by impurities being precipitated out of the water directly on heat transfer surfaces or by suspended matter in water settling out on the metal and becoming hard and adherent. Evaporation in a boiler causes impurities to concentrate. This interferes with heat transfers and may cause hot spots. Leading to local overheating. Scaling mechanism is the exceeding of the

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Marine Engineering Knowledge by Rajan - Boiler

A modern high pressure, high temperature water tube boiler holds a small quantity of water and produces large quantities of steam. Very careful control of the drum water level is therefore necessary. The reactions of steam and water in the drum are complicated and require a control system based on a number of measured elements.

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PDF Do Seal and Condensate Pots Need to be Heat Traced?

Seal pots (sometime called condensate pots) are used to allow a liquid seal between the instrument and flow-ing gases such as steam. Their function is to keep the liquid level constant in the impulse tubes. For example, in boiler liquid level applications the high pressure (HP) side of a differential pressure transmitter is connected

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Water Handbook - Preboiler & Industrial Boiler Corrosion

The trays are placed in each drum of a water tube boiler, or on the top flues of a fire-tube unit. All manholes, handholes, vents, and connections are blanked and tightly closed. The boiler should be opened every month for inspection of the desiccant.

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PDF Technical Guidance Document: Steam Purity for Turbine

Drum boiler or HRSG (drum-type) Boiler in which steam (generated in heated evaporator tubes) is separated from water in an unheated horizontal pressure vessel (drum). The liquid phase is recirculated to the evaporator. Feedwater Water that is pumped into a boiler or HRSG to balance the steam production

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PDF Sama Diagrams for Boiler Controls Application Data

Three-Element Drum Level Control A common application in boiler control is three-element drum level control. Boiler drum level is a critical variable in the safe operation of a boiler. Low drum level risks uncovering the boiler tubes and exposing them to heat stress and damage. High drum level risks water carryover

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Learn about steam | Spirax Sarco

Water Tube Boilers. Description of water tube boilers including operation, types and benefits; also, a brief synopsis on how they are applied to combined heat and power generation. Miscellaneous Boiler Types Economisers and Superheaters. An explanation of specialist boiler types and other specialist features. Boiler Ratings

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Power plant maintenance: STEAM DRUM INTERNAL PARTS

The boiler water is evaporated continuously and the relative pure steam leaves the boiler drum. This mechanism is leads to concentration of boiler water with more dissolved solids. Since the solubility of various dissolved solids is limited based on the operating pressure, it is necessary to limit the concentration of dissolved solids in the boiler water.

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PDF Coker Furnace On-Line Spalling

number of tubes and their orientation, tube design and geometry, box design, number of tube passes and furnace cells, etc., but all require decoking the furnace tubes at some time. Coker furnaces built prior to the early 1990's were normally the single fired type. Today's coker furnaces are typically double fired furnace designs like those

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PDF ARTICLE All Volatile Treatment - AVT(O) for HRSGs

88 All Volatile Treatment - AVT(O) for HRSGs - Araucaria Power Station The goal is to maintain the pH and phosphate residual in the center of its box, taking into account the working pressure of the boiler. In cogeneration plants that use part of the steam for process, large and abrupt changes of system control

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Boiler-Tuning Basics, Part II - POWER Magazine

Feedwater enters the boiler through a series of low- and high-pressure steam heaters into the drum. The water then journeys through the water walls of the furnace and absorbs heat until steam is

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PDF Civa Modelling for Internal Ultrasonic Tube Testing

with fins or studs to increase their heat transfer capabilities. In the mid to late 1970s a simple design existed for inspecting boiler tubes in large fireboxes. The tubes were flooded from the water drum (or mud drum) up to near the steam drum and the operator pushed the 4-probe centring unit down each tube and slowly pulled it up while

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What is a Boiler Deaerator and How Does It Operate? - MPC

Regardless of the type of boiler deaerator, each functions generally in the same way. When water passes from the feed water tank into the boiler deaerator, it enters through the inlet water connection. The water flows through a heating and venting section that is filled with steam.

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Boiler Inspection

The water tube boiler is made from several components such as the HP Drum, finned Tubes, Headers, Tube Bundle, Stack, Damper, Silencer, Deaerator, etc. For more detailed information about water tube boiler shop inspection, review the following articles: Third Party Inspection for Water Tube Boiler. Inspection and Test Plan for Water Tube Boiler

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Maritime Heritage of The United States Nhl Theme Study

The boilers are aft of the engine room. They are oil-fired, sectional water-tube, single cross-drum marine boilers built by the Foster Wheeler Corporation. These are the boilers that powered the boat when she was built. They were state of the art at that time. Heat passed around water-filled tubes in the boiler, heating it and assuring circulation.

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Water tube boilers with longitudinal steam drums as in Fig

Water-tube boilers with longitudinal steam drums, as in Fig above were developed to allow increases in generated steam pressure and increased capacity. The water-tube boilers, in which water flowed through inclined tubes and the combustion product gases flowed outside the tubes, put the desired higher steam pressures in the small diameter tubes which could withstand the tensile stress of

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What are baffles in water tube boilers - Answers

Baffles in water tube boilers are generally spiral twisted pieces of metal (though other methods have been used) inserted into the flue tube to cause turbulence, in addition to back pressure for

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Boiler Components - Marine Engineering

For water tube boilers gas air heaters are only considered where the temperature at inlet to economiser is greater than 200 o C. Due to greater heat transfer efficiency between gas/water economisers are preferred to gas/air exchangers. Types of air heaters. Lungstrom gas/air heater (regenerative)

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Three Element Drum Level Control - CrossCo

This arrangement is called "Three Element Drum Level Control" (3E) because the algorithm uses level, BFW flow, and steam flow. "Single Element" or (1E) control should be used when either flow is too low or has bad quality . 1E is a simple PID loop with the level as process variable (PV), the output going to the valve, and no feed forward.

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Foaming and priming in boilers - Lenntech

Boiler water carry-over is the contamination of the steam with boiler-water solids. Bubbles or froth actually build up on the surface of the boiler water and pass out with the steam. This is called foaming and it is caused by high concentration of any solids in the boiler water. It is generally believed, however, that specific substances such as alkalis, oils, fats, greases, certain types of

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Marine Engineering: What is a Marine Boiler?

The steam generated by the boiler can also be use for cleaning, and heating of the seawater in the freshwater generator thus evaporating it to make it potable water. There are two types of boiler mainly use in the Marine Industry, The water-tube boilers and the fire-tube boilers. The most common of which is the water-tube.

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PDF Steam power plant configuration, design, and control

Steam power plant configuration, design, and control Xiao Wu,1 Jiong Shen,1 Yiguo Li1 and Kwang Y. Lee2∗ This article provides an overview of fossil-fuel power plant (FFPP) configura-tion, design and especially, the control technology, both the conventional and the advanced technologies. First, a brief introduction of FFPP fundamentals and con-

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NH3 I & Boiler I Boot Camp Competencies - ammonia training

Boiler design/application - The boiler operator should know fire tube, vertical (submerged and nonsubmerged), horizontal, water tube, and cast iron type boiler construction. The boiler operator should be able to describe the differences between package and site-erected boilers.

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Boilers (industrial) Specifications | Engineering360

Water Tube Water tube boilers have a heating surface that consists of a large number of relatively small-diameter tubes that contain the water. The heat is applied to the external side of the tubes. Other Other unlisted technology types. Search Logic:

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PDF U.S.C.G. Merchant Marine Exam Master of Unlimited Tonnage

What is NOT a function of the steam drum of a marine water-tube boiler? o (A) Holds internal fittings for separation of moisture from steam o (B) Serves as a reservoir of boiler feedwater • (C) Collects steam exhausted from the turbines o (D) Receives saturated steam from the generating tubes If choice C is selected set score to 1. 19.

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PDF Operation and maintenance schedule of a steam turbine

A steam drum is used without or in the company of a mud-drum/feed water drum which is located at a lower level. A boiler with both steam drum and mud/water drum is called a bi-drum boiler and a boiler with only a steam drum is called a mono-drum boiler. The bi-drum boiler

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Chapter 12 Boiler Deposits: Occurence And Control - SUEZ

In addition to causing material damage by insulating the heat transfer path from the boiler flame to the water (Figure 12-2), deposits restrict boiler water circulation. They roughen the tube surface and increase the drag coefficient in the boiler circuit.

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What Is A Steam Trap & How Does A Steam Trap Work?

What is a steam trap? A steam trap is a device that removes condensate from a steam system. A typical steam system will have many steam traps - they are placed at 50-150' intervals in straight pipe, after every heat exchanger (where the work gets done), and at every location where there is a change of elevation or pressure.

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PPT - boiler PowerPoint presentation | free to download

Fire Tube Boiler Locomotive Boiler Horizontal Multi-tubular Natural circulation Internally fired Fire tube Portable. 11 Water Tube Boiler A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the hot gases / flue gases. Water tube boilers are used for high-pressure boilers.

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PDF Basic Mechanical Engineering Lab Manual

Water drum 3. Fuel for heating TYPES OF BOILERS :- a. Water tube boiler The hot gases passing through the horizontal smoke tubes give their heat to the water and in The water tube boilers

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46 CFR § 52.01-3 - Definitions of terms used in this part

A tube sheet is a portion of a boiler drum, or header perforated for the insertion of tubes. (14) Ligament. The ligament is the section of metal between the holes in a tube sheet. (i) Longitudinal ligament. A longitudinal ligament is the minimum section of metal between two tube holes on a line parallel with the axis of the drum.

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Water Tube Boiler Parts and Functions - Boilersinfo

What is a water tube boiler? Water tube boilers were developed for a variety of reasons, including the need for higher steam pressures, higher steam generation rate, superheated steam. these types of boilers have quicker response to load changes. We briefly discuss about Water tube boiler parts and functions.

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US1656475A - Fire box for locomotive boilers - Google Patents

After the tube sheet, back water leg, headers, cylinder part of the boiler and fire tubes are assembled as hereinbefore set forth, the water tubes are to have their ends laced in the holes in the bottoms of the si e extensions of the upper headers and in the holes in the tops of the lower headers and said ends are then to be swedged or

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PDF A Review of the Common Causes of Boiler Failure in the

encompassed both fire-tube and water-tube boilers with a further subdivision of water tube boilers into sugar and non-sugar boilers. Although there are only a limited number of fire-tube boilers in use in the sugar industry it was felt that seriousness of the failure mechanisms warrants their inclusion in this paper. The statistics

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Plant Engineering | Understanding boiler bypass lines

A circulator on the boiler side of the bypass raises the return water temperature. A circulator on the system side of the bypass lowers the supply water temperature. Boiler manufacturers emphasize bypass lines today—and with good reason. Boilers are relatively small now. Their heat exchangers are much more efficient than are those in older

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Economizer - an overview | ScienceDirect Topics

The economizer is a bunch of horizontal water tubes usually located in the back pass or second pass (after the primary superheaters and reheaters) of the boiler through which the feed water enters the boiler to absorb the residual heat from the exhaust flue gas and transfer it to the steam production cycle. This process helps in improving

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Parts of a Bunsen Burner & Their Functions | Sciencing

A Bunsen burner is one of the most common pieces of equipment in the laboratory, and many scientists use it in their work. It is a special burner, which uses flammable natural gases such as methane, or petroleum gases such as propane, to burn and works similarly to a gas stove.

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PART 14 - New York State Department of Labor

(b) Tube ends or weld necks may be fusion welded to the drums of water-tube boilers without expanding or flaring. (c) Where pipe is used for tubes in water tube boilers, it may be screwed instead of rolled and flared. The ends of stub tubes may be closed by either forge or fusion welding.

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