Piping and Valves Unit 8

Today’s Agenda Purpose of piping and valves Material of construction and service Pipe fittings Piping and valve connections Types of valves Hazards Maintenance Troubleshooting

Piping and Valves Piping Systems Move fluids (liquids and gases) and some solids from place to place Valves Control direction and flow rates of fluids as they move through the system Two Types of Piping Systems 1. Process lines that carry fluids & some solids 2. Service lines that carry water, gas, steam and air

Materials Metal Piping – usually for higher pressure service –Pure metals –Alloys (special service – corrosives, abrasives) Non-Metallic Pipe – usually for utility and/or corrosive service –Clay or Concrete –Plastic –Glass

Pipe Fittings Join sections of pipe or change the direction or amount of flow. Types –Coupling –Plug –Reducer –Others

Bushing Plug Coupling Reducer “T” Cross Union Bushing

Connecting Pipes and Valves Screwed Flanged Welded Glued or bonded

Valves Valves Block Gate Plug Ball Throttling/Regulating Globe Needle Butterfly Diaphragm Check Swing Lift Ball A valve is a device for controlling the flow of a material (most often gas or liquid). TYPES Safety and Relief Safety – gas service, quick opening Pressure Relief – liquid service, slower to open

Valves Valves Block Gate Plug Ball Throttling/Regulating Globe Needle Butterfly Diaphragm Check Swing Lift Ball A valve is a device for controlling the flow of a material (most often gas or liquid). TYPES Safety and Relief Safety – gas service, quick opening Pressure Relief – liquid service, slower to open

Common Valves Ball Gate Butterfly Safety

Piping and Valve Hazards Overtightening of valve –Damage to stem, internals, packing –Back strain, pinch points, off balance –May cause a release from damaged packing Inattention to surroundings –Personal injury, pinch points, stumble, off balance, damage Not tightening packing nuts –Possible contact w/ chemical –Leak to environment –Erosion of valve stem Not lubricating valve stems –Back, shoulder, muscle strain –Damage to stem (bend) Corrosion –Leaks to environment, explosive atmosphere, personnel exposure –Loss of product

Monitoring and Maintenance Scheduled & preventive maintenance Monitoring –Inspect for leaks and corrosion –Grease and lubricate –Adjust packing –Labeling/numbering –Check for loose valve parts –Listen for chattering

Symbols Piping Valves

Globe Valve

Futher Investigation Pipe Fittings Worksheet Valve Scenarios Worksheet