4bE3.5 U3 C1 Obj 2 Matching
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Match the following reasons with their effects on the relief valve:

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

Match the following issues with their causes:

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

Match the following conditions with their results:

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

Match the following problems with their solutions:

<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

Match the following effects with their causes:

<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

Match the following ASME BPVC, Section IV rules with their corresponding descriptions:

<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

Match the following ASME BPVC, Section IV rules with their corresponding descriptions:

<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

Match the following ASME BPVC, Section IV rules with their corresponding descriptions:

<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

Match the following installation requirements with their corresponding descriptions:

<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

Match the following installation requirements with their corresponding descriptions:

<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

Match the following installation requirements with their corresponding descriptions:

<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

Match the following installation requirements with their corresponding descriptions:

<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

Match the following installation requirements with their corresponding descriptions:

<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

Match the following safety valve features with their descriptions:

<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

Match the following safety valve requirements with their corresponding ASME codes:

<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

Match the following safety valve characteristics with their types:

<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

Match the following safety valve operation characteristics with their types:

<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

Match the following safety valve features with their purposes:

<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

Match the following safety valve installation requirements with their descriptions:

<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

Match the following safety valve limitations with their types:

<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

Match the following safety valve components with their descriptions:

<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

Match the following safety valve problems with their causes:

<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

Match the following safety valve requirements with their purposes:

<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

Study Notes

ASME Code Requirements for Safety Valves and Relief Valves

  • ASME BPVC, Section IV Rules for Construction of Heating Boilers contain rules for safety valves and safety relief valves installed on heating boilers.

Safety Valve Requirements

  • Each steam boiler shall have one or more officially rated safety valves of the spring pop type adjusted and sealed to discharge at a pressure not to exceed 15 psi (100 kPa).
  • No safety valve for a steam boiler shall be smaller than NPS ½ (DN 15) or larger than NPS 4 (DN 100).
  • The safety valve capacity for each steam boiler shall be such that with the fuel burning equipment installed, and operated at maximum capacity, the pressure cannot rise more than 5 psi (35 kPa) above the maximum allowable working pressure.
  • A body drain below seat level shall be provided by the Manufacturer for all safety valves and safety relief valves to prevent the collection of condensate around the valve and seat.

Mounting Safety and Safety Relief Valves on Heating Boilers

  • Safety valves and safety relief valves must be installed with their spindles vertical.
  • Safety valves must be connected directly to one of the following:
    • A tapped or flanged opening in the boiler
    • A fitting connected to the boiler by a short nipple
    • A y‐base
    • A valveless header connecting steam or water outlets on the same boiler
  • Safety valves and safety relief valves must be located in the highest practicable part of the boiler proper.
  • 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.
  • No shut-off valve of any description shall be placed between the safety or safety relief valve and the boiler, or on discharge pipes between these valves and the atmosphere.
  • Discharge pipes must be used and must be:
    • As short and straight as possible, and arranged so as to avoid undue stress on the valve
    • Properly drained to prevent collection of water
    • Arranged so that there will be no danger of scalding the operator
  • The internal cross-sectional area of the discharge pipe must not be less than the full area of the valve outlet

Specific to Safety Valves (Steam Service)

  • The safety valve must never be located below the normal operating water level, or below the lowest permissible water level.
  • Low-pressure steam heating boilers are designed to operate at no higher than 100 kPa.
  • A safety valve especially designed for low-pressure steam heating boilers is described in the text, with a valve body connected to the boiler and a bonnet with an outlet opening to atmosphere.

Safety Relief Valves for Hot Water Heating Boilers

  • Each hot water heating or supply boiler shall have at least one officially rated safety relief valve, of the automatic reseating type, and set to relieve at or below the maximum allowable working pressure of the boiler.
  • Safety relief valves shall have pop action when tested by steam.
  • The design of the safety relief valve is similar to that of the safety valve used for steam boilers, but with some differences.
  • Safety relief valves should not open frequently, or leak water, during normal plant operation. Common causes of frequent safety relief valve operation include:
    • Waterlogged heating system
    • Scale, corrosion products, or chemical residue accumulations on the valve seat
    • Installed safety relief valve designed for the wrong pressure range
    • Damaged seating surfaces or weakened compression springs from erosion, corrosion, and lengthy service duration

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Description

This quiz covers the rules for safety valves and safety relief valves installed on heating boilers, specifically Part HG-400.1 and Part HG-401 of the ASME BPVC Section IV. Topics include steam boiler safety valve requirements and pressure discharge limits.

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