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Paul McElrath - Water Heater 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). Alarm Check Valve ~ A check valve located in the riser of a wet pipe fire sprinkler system that sounds an alarm when water begins to pass through it. Galvanic series ~ A list of metals with those on the top of the list being attacked by those lower down in the list. The father apart on the list, the faster the attack. Paul McElrath - Heating Tips Barlow's Formula ~ An equation which shows the relationship of internal pressure to allowable...See more » Paul McElrath - Water Heater 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). Alarm Check Valve ~ A check valve located in the riser of a wet pipe fire sprinkler system that sounds an alarm when water begins to pass through it. Galvanic series ~ A list of metals with those on the top of the list being attacked by those lower down in the list. The father apart on the list, the faster the attack. Paul McElrath - Heating Tips Barlow's Formula ~ An equation which shows the relationship of internal pressure to allowable stress, nominal thickness and diameter. Elbow ~ A fitting with two openings that changes the direction of the line. Also known as an ell. It comes in various angles from 22 ½ degrees to 90 degrees; often referred to by their angles (i.e. 45, 90) Uniformity Coefficient ~ A measure of the variation in particle sizes of ion exchange resins and filter media. It is defined as the ratio of the size of particle that has 60 percent of the material finer than itself, to the size of the particle that has 10 percent finer than itself. Paul McElrath - About Pipes : Balloon Bag ~ Device that attaches to a garden hose & used to loosen a blockage in a clogged drain More related websites: Paul McElrath - Install Black Iron Pipe Paul McElrath - Faucet Repairs Paul McElrath - About Pipes Paul McElrath - Plumbing Repair Paul McElrath - About Plumbing Tools Paul McElrath - Water Heater Paul McElrath - Steel Piping Paul McElrath - Install PVC PipeSee less »