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Alpha Plumbing Home Page Water Heaters, Slab Leaks, Trenchless Sewer Replacement, Faucets Repaired and Installed, Toilets Repaired and Installed, Gas Leaks, Food Disposers Water Heaters/Boilers, Water Tempering, Backflow Devices, Service Agreements & PM’s, Trenchless Pipe Replacement, Faucets & Fixtures, Drain Stoppages, Water & Sewer Lines, Gas Lines, Grease & Other Interceptor Installation, Pump Repair & Installation Water Heaters/Boilers, Water Tempering, Backflow Devices, Service Agreements & PM’s, Trenchless Pipe Replacement, Faucets & Fixtures, Drain Stoppages, Water & Sewer Lines, Gas Lines, Grease & Other Interceptor Installation, Pump Repair & Installation Underground Utilities Repair and Installation Testing, Repair and Installation Water Leaks, Sewer Leaks, Gas Leaks, Video Inspections, Line Tracing, Pin Point Leak Locations, Sewer Odors Hydro-Jetting, Cabling, Maintenance Underground pipe replacement without digging a trench Jobsites of interest Contact Alpha Plumbing All about Alpha Plumbing Our site map for your convenience.




Glossary of Plumbing Terms









HBA Home Builders Association
HD Head
HP Horsepower
HT Hose Threads. Note: Garden hose threads are different from standard pipe threads.
HVAC Heating, Ventilation, and Air Conditioning.
Hand-shower A showerhead designed with a handle that's connected to a water supply and a flexible hose.
Hanger A device used to support pipes.
Hard Water Natural water containing impurities in various proportions. Traditional hardness is a measure of calcium or dissolved solids in a solution, measured in parts per million. Hard water generally ranges from 100 to 250 ppm.
Hardness The amount of dissolved minerals in water measured in grains per gallon (GPG). The most common minerals are calcium and magnesium.
Hardness Leakage The presence of a consistent concentration of hardness in the effluent from an ion exchange water softener, often due to high concentrations of hardness or sodium in the water being treated (see Leakage).
Head The pressure of water (or steam) in a closed system (see Pressure Head). It represents the differential in the gravitational force exerted by a liquid at two different depths.
Head Loss The pressure of water as measured at a stated point, either in feet or in pounds per square inch (PSI).
Heat Exchanger A heat transfer system.
Heat Sensors Heat-triggered devices on sprinkler systems that release the flow of water.
Heat Trap Restriction of heat loss through water connections to a tank.
Hermetic Completely sealed, especially against the escape or entry of air.
Hold Down A type of pipe anchor consisting of a U-strap bolted at either end onto a horizontal plate.
Hollow-jet Valve A valve having a closing member that moves upstream to shut off the flow. The hollow-jet valve discharges a hollow or annular jet dispersed over a wide area.
Horizontal Branch Lateral drain pipes that run from plumbing fixtures to the waste stack in a building or in the soil.
Horizontal Run The horizontal distance between the point where fluid enters a pipe and the point at which it leaves.
Hose Bibb An outdoor faucet, also used to supply washing machines.
House Trap U-shaped fitting with two adjacent cleanout plugs visible at floor level if main drain runs under floor.
Hub & Spigot Piping Gravity rated DWV or pressure pipe that has a bell-shaped section at one end and a straight section at the other. As lengths are assembled, the straight end of one fits into the bell of the next.
Hydration The chemical absorption of water into a substance.
Hydraulic Pressure Pressure that exists in a system containing non-compressible liquid.
Hydrolysis The reaction of a salt with water to form an acid and a base.
Hydronic System of forced hot water.
Hydrojet Cold inlet tube designed to reduce sediment build-up and increase efficiency in a water heater.
Hydro Jetting (Service) The process of clearing blocked pipes using high pressure water as a boring and flushing mechanism. More on Hydro Jetting Service
Hydrostatic Pressure Pressure exerted by or existing within a liquid at rest with respect to adjacent bodies
Hydrostatic Test Test using non-compressible liquid under pressure at a level equal to or greater than the maximum pressure that will be utilized when in use, such as in steam boilers.
Hypochlorite The OCL anion; calcium and sodium hypochlorite are commonly used as bleaches and disinfecting agents.
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