Boiler Fittings and Mountings

Boiler name-plate

In the latter half of the 19th century explosions of steam boilers were commonplace. As a consequence of this, a company was formed in Manchester with the objective of reducing the number of explosions by subjecting steam boilers to independent examination. This company was, in fact, the beginning of today&#;s Safety Federation (SAFed), the body whose approval is required for boiler controls and fittings in the UK.

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After a comparatively short period, only eight out of the 11 000 boilers examined exploded. This compared to 260 steam boiler explosions in boilers not examined by the scheme. This success led to the Boiler Explosions Act () which included a requirement for a boiler name-plate. An example of a boiler name-plate is shown in Figure 3.7.1.

The serial number and model number uniquely identify the boiler and are used when ordering spares from the manufacturer and in the main boiler log book.

The output figure quoted for a boiler may be expressed in several ways, as discussed in previous Modules within this Block.

Safety valves

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An important boiler fitting is the safety valve. Its function is to protect the boiler shell from over pressure and subsequent explosion. In the UK:

In Europe, matters relating to the suitability of safety valves for steam boilers are governed by the European standard EN . In the US and some other parts of the world, such matters are covered by ASME standards.

Many different types of safety valves are fitted to steam boiler plant, but generally they must all meet the following criteria:

• The total discharge capacity of the safety valve(s) must be at least equal to the &#;from and at 100°C&#; capacity of the boiler. If the &#;from and at&#; evaporation is used to size the safety valve, the safety valve capacity will always be higher than the actual maximum evaporative boiler capacity.
• The full rated discharge capacity of the safety valve(s) must be achieved within 110% of the boiler design pressure.
• The minimum inlet bore of a safety valve connected to a boiler shall be 20 mm.
• The maximum set pressure of the safety valve shall be the design (or maximum permissible working pressure) of the boiler.
• There must be an adequate margin between the normal operating pressure of the boiler and the set pressure of the safety valve.

Overall, I think that this is an excellent book... I originally purchased it to help me study for taking my Chief "A" Boilers Exam for the state of Minnesota. Just to let it be known that this is a great study guide for the "B" Boilers Exams - not the "A" Exams (for Low & High Pressure Boilers - not Turbines, but I figured that when I purchased it)... I really liked that it had "Test Quizzes" at the end of each chapter (there are 12 Chapters in the book) with one of the chapters at the end that has six practice exams. There is one thing that I didn't like about this book is that there is no "Answer Key" for the quizzes in the book so you would have to go through the chapters to find the correct answer. However, the CD-ROM provided several practice exams & it gave you the correct answers for each question (although there were a couple of questions that even with the correct answer selected, it would still mark it wrong). I took the Chief "A" Boilers Exam for the state of Minnesota in the fall of & I did very well on it:) Many of the questions on the exam I have seen in the quizzes in this book (mainly in the "Licensing Chapter" & on the CD-ROM), but this is still with the "old test" - I was told that the Minnesota Boilers Exams were going to be updated & made more difficult.

After the exam, this book makes a great reference book for boiler operations (such as changing a sightglass, starting up & shutting down a boiler, preparing a boiler for inspection, etc.). Although I really do wish that there was an "Answer Key" with it along with explanations for some of the answers, I think that it's a great book to have as a "Boiler Operator":)

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