4bE3.5 U3 C1 Obj 2 Matching

Scale accumulation on valve seat = Relief valve weeps Expansion tank filled with water = Heating system pressure increases dramatically Wrong pressure range of safety relief valve = Safety relief valve may not function properly Damaged seating surfaces or weakened compression springs = Safety relief valve may not close tightly

Heating system pressure increases dramatically = Expansion tank filled with water Safety relief valve weeps = Scale accumulation on valve seat Make-up water enters the system = Burner shuts off and water cools Safety relief valve may not function properly = Wrong pressure range of safety relief valve

Water cools = Make-up water enters the system Safety relief valve weeps = Waterlog in the system Scale accumulation on valve seat = Relief valve does not close tightly Expansion tank filled with water = Heating system pressure increases dramatically

<p>Expansion tank filled with water = Isolate, drain, and return to service Scale accumulation on valve seat = Clean or replace the valve seat Wrong pressure range of safety relief valve = Install a new valve with correct pressure range Damaged seating surfaces or weakened compression springs = Repair or replace the safety relief valve</p> Signup and view all the answers

<p>Waterlog in the system = Make-up water enters the system Heating system pressure increases dramatically = Expansion tank filled with water Relief valve does not close tightly = Scale accumulation on valve seat Safety relief valve weeps = Damaged seating surfaces or weakened compression springs</p> Signup and view all the answers

<p>HG-400.1 (a) = Size of safety valve for steam boiler HG-400.1 (b) = Size of safety valve for steam boiler shall not be smaller than NPS ½ (DN 15) HG-400.1 (e) = Safety valve capacity for steam boiler</p> Signup and view all the answers

<p>HG-400.1 (e) = Safety valve capacity for steam boiler shall not rise more than 5 psi (35 kPa) HG-400.1 (b) = Safety valve capacity for steam boiler shall not exceed 15 psi (100 kPa) HG-400.1 (a) = Safety valve capacity for steam boiler shall not rise more than 5 psi (35 kPa)</p> Signup and view all the answers

<p>HG-401.1 (h) = Body drain below seat level for all safety valves and safety relief valves HG-400.1 (a) = Each steam boiler shall have one or more officially rated safety valves HG-400.1 (b) = Size of safety valve for steam boiler shall not be smaller than NPS ½ (DN 15) HG-400.1 (e) = Safety valve capacity for steam boiler shall not rise more than 5 psi (35 kPa)</p> Signup and view all the answers

<p>Part HG-700 = Mounting requirements for safety and safety relief valves on heating boilers Part HG-400 = Installation of safety and safety relief valves on heating boilers Part HG-401 = Mounting requirements for safety and safety relief valves on heating boilers</p> Signup and view all the answers

<p>Part HG-700 = All safety and safety relief valves must be located in the highest part of the boiler Part HG-400 = Safety valves and safety relief valves must be connected directly to the boiler Part HG-401 = A body drain below seat level shall be provided by the Manufacturer</p> Signup and view all the answers

<p>Part HG-700 = A body drain below seat level shall be provided by the Manufacturer Part HG-400 = Safety valves and safety relief valves must be located in the highest part of the boiler Part HG-401 = Safety valves must be installed with their spindles vertical</p> Signup and view all the answers

<p>Part HG-700 = Each steam boiler shall have one or more officially rated safety valves Part HG-400 = A body drain below seat level shall be provided by the Manufacturer Part HG-401 = Safety valve capacity for steam boiler shall not rise more than 5 psi (35 kPa)</p> Signup and view all the answers

<p>Part HG-700 = Size of safety valve for steam boiler shall not be smaller than NPS ½ (DN 15) Part HG-400 = Safety valves and safety relief valves must be located in the highest part of the boiler Part HG-401 = Safety valves and safety relief valves must be installed with their spindles vertical</p> Signup and view all the answers

<p>Valve body = Directly connected to the boiler Bonnet = Threaded and locked onto the valve body Valve disc = Closes the opening in the upper part of the valve body Adjusting cap = Compresses the spring</p> Signup and view all the answers

<p>Low-pressure steam safety valves do not have adjustable blowdown = ASME BPVC IV, Part HG-401 Each hot water heating or supply boiler shall have at least one officially rated safety relief valve = ASME BPVC IV, Part HG-400.2 Safety relief valves shall have pop action when tested by steam = ASME BPVC IV, Part HG-401.1 No shut-off valve of any description shall be placed between the safety or safety relief valve and the boiler = ASME BPVC IV</p> Signup and view all the answers

<p>Shorter and wider than high-pressure safety valves = Low-pressure safety valves Spring loaded, has body drain openings, and has a lifting device = Safety relief valves Especially designed for low-pressure steam heating boilers = Low-pressure steam safety valves Has adjustable blowdown ring = Safety valves for power boilers</p> Signup and view all the answers

<p>Opens partially when boiler pressure slightly exceeds the valve setting = Safety relief valves Pops wide open on further pressure rise = Safety relief valves Has immediate popping action = Safety valves for steam boilers Leaks water during normal plant operation = Faulty safety relief valves</p> Signup and view all the answers

<p>Heavy spring = Holds the disc down upon its seat Adjusting cap = Compresses the spring Locking screw = Holds the cap in position Valve outlet = Allows discharge to atmosphere</p> Signup and view all the answers

<p>Discharge pipes must be used = To prevent backflow to the boiler Discharge pipes must be as short and straight as possible = To avoid undue stress on the valve Discharge pipes must be properly drained = To prevent collection of water Discharge pipes must have a flexible joint = To allow for pipe expansion</p> Signup and view all the answers

<p>Should not be located below the normal operating water level = Safety valves for steam boilers Should not be located below the lowest permissible water level = Safety valves for steam boilers Are designed to operate at no higher than 100 kPa = Low-pressure steam heating boilers Should not open frequently during normal plant operation = Safety relief valves</p> Signup and view all the answers

<p>Valve body = The main part directly connected to the boiler Bonnet = The main part with an outlet opening to atmosphere Valve disc = The part that closes the opening in the upper part of the valve body Try lever = The lifting device on the safety relief valve</p> Signup and view all the answers

<p>Frequent safety relief valve operation = Waterlogged heating system Leaking water during normal plant operation = Faulty safety relief valve Improper valve installation = Undue stress on the valve Valve malfunction = Incorrect valve setting</p> Signup and view all the answers

<p>No shut-off valve of any description shall be placed between the safety or safety relief valve and the boiler = To ensure safe operation The internal cross-sectional area of the discharge pipe must not be less than the full area of the valve outlet = To prevent backflow to the boiler Discharge pipes must be used = To allow for safe discharge of excess steam The opening or connection between the boiler and any safety valve or safety relief valve must have at least the same cross-sectional flow area of the valve inlet = To ensure proper valve operation</p> Signup and view all the answers