Safety Valves, Steam Traps & Soot-blowers Flashcards
What is the most important valve(s) on a boiler?
The safety valve(s) is the most important valve(s) on a boiler.
What is the safety valve test lever used for?
The safety valve test lever is used to manually operate (lift) the safety valve.
What type of valve is used between the boiler and the safety valve?
No intervening valves are permitted between the boiler and the safety valve(s).
How often should safety valve(s) be tested?
Safety valves should be tested every month (30 days).
Who can make adjustment / repairs to a safety valve?
The manufacturer or authorized representative are permitted to make repairs/adjustments to safety valves.
What is the lowest set safety valve on a boiler?
The superheater safety valves(s) are the lowest sets safety valve(s) on a boiler in order to assure steam flow thru the superheater.
What is a safety valve gag used for?
A safety valve gag is used to prevent the safety valves from lifting during a hydrostatic test.
What is blind flange?
A blind flange is a cover is attached once the safety valve is removed.
How does a relief valve work?
A relief valve opens gradually as the pressure increase, it does not “pop” wide ope like a safety valve.
What pressure should safety valve be manually opened?
75% of working pressure surface on the boiler is considered the best time to manually operate the safety valves.
Ash deposits on boiler surfaces has what effect on efficiency?
Ash/soot build-up on boiler surfaces reduce boiler efficiency.
When can an operator adjust safety valve?
Operator are not permitted to make any adjustments to safety valves.
What does a steam trap do?
A steam trap automatically removes air and water from steam lines with out the loss of steam.
How would you know a steam trap wasn’t working?
NO heat to process, water hammer, high temperature condensate returns, no condensate returns, low/no delta T across trap, etc.
Name four (4) types of steam traps.
Inverted bucket, float and thermostatic, thermodynamic are thermostatic are 4 types of steam traps.
