(LA Steam Engineer License Exam) Study Guide Questions
38 views 0 purchase
Course
LA Steam Engineer License
Institution
LA Steam Engineer License
What are the precautions to be observed when starting any boiler that has been closed dow overnight? Are there any special precautions required starting a gas burning boiler? - Answer- Make a physical observation of the boiler and its systems, walk around the boilerto check for any abnormal conditi...
(LA Steam Engineer License Exam) Study Guide Questions
What are the precautions to be observed when starting any boiler that has been closed dow overnight? Are there any special precautions required starting a gas burning boiler? - Answer- Make a physical observation of the boiler and its systems, walk around the boilerto check for any abnormal conditions such as flammable material at the dampers, fuel leaks,damaged electrical conduits, etc. Check all boiler systems (feedwater, fuel, etc). Very important issue in starting a gas firing boiler is a furnace prepurge. It is never has to be altered or bypassed.
How do you determine whether feedwater check valve for the boiler is not closing? - Answer- Check the temperature differential at the check valve when feedwater pump is not in operation.
What causes foaming in the boiler? How would you know when a boiler is foaming? How do you stop foaming in a boiler? - Answer- High TDS, organic matter and oil in the boiler cases foaming. If the water level in the gage glass fluctuates, the most probable cause of thisis foaming. We reduce amount of TDS by continuous and bottom blowdowns;we use anti-foaming chemicals to prevent foaming.
What is boiler priming? What causes priming? How can priming in a boiler damage an engine or pump? - Answer- When the liquid water from the boiler drum gets to the steam lines it called priming. Priming can be caused by boiler drum level excessively high, by foaming, sudden pressure drop,and firing ratebeing to high. Priming causes water hammer that could destroy or shorten the life expectancy of a load (mechanical damage)
What would you do if the pressure gauge on the boiler registers 150 psi and you knew that the safety valve was set to open at 100 psi? - Answer- Most likely pressure gage failed. In order to get such excessive pressure both operating and high pressure limit controls have to fail also, plus the safety valve. Also, if the boiler was over pressurized to such extent, it would give some indications such as excessive vibration and abnormal
sounds.Pressure gage can be quickly isolated and changed.
How do you test a safety valve to see if it operates at the proper set pressure? What is the difference between a safety valve and a relief valve? How often do you test these valves? How is leaking safety valve repaired? - Answer- Pressure valves can be tested hydrostatically (boiler filled up with water pressure).Safety valves open instantaneously and relief valves do not open fully with a set pressure.Safety valves are tested manually
once a month and pressure tested once a year.Safety valves can be only repaired by a manufacturer or an authorized company.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Greaterheights. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.79. You're not tied to anything after your purchase.
