Explanation:
An air gap is believed to be superior to an air break for the protection of an indirect waste pipe from back siphonage. Due to the nature of the installation, there is more risk of a backflow occurring with an air break. Since air breaks have discharge piping entering a receptor it is feasible to have the sanitary drain become clogged and back up, which could result in contaminated waste traveling back to the indirect waste fixture. This is not possible when an air gap is used.
Explanation:
It is common for modern DWV systems to be tested with air. In the old days, water was the most common means of testing. When there is a leak that cannot be found easily, smoke can be used to expose the leak location. Smoke is not used as a primary test method. Air is the test medium of choice. The testing of a DWV system is to be conducted for a minimum of 15 minutes. The minimum test pressure is required to be 10 pounds per square inch (PSI). If only underground plumbing is being tested there must be one riser that is at least ten feet above the main plumbing system.
Explanation:
Flow controls on gas systems are installed to keep the operating pressure of the system lower than the supply pressure for the system. These devices prevent excessive pressure from the distribution system. They must be approved and suitable both the inlet and outlet gas pressure for the application. The flow controls must be readily accessible.
Explanation:
Handicapped toilets are available with heights that include 16 inches, 18 inches, and 20 inches. Eighteen inches is the most common height of a standard handicap toilet.
Explanation:
All flexible water connections are required to be accessible. This means that they can be concealed in a cabinet or behind an access panel, but they must be accessible.
Explanation:
Exhaust must be discharged outdoors in a way which will minimize the hazard of noise and contamination to the environment.
Explanation:
The maximum allowable time for the retention of gray water that will be used to flush toilets or urinals is 72 hours. Holding water for long periods of time can result in the growth of bacteria. This bacteria is not wanted in the plumbing system. For example, green water in a toilet tank is not appealing and could present health hazards. When a gray water recycling system is sized properly the water retained in a collection reservoir would be balanced to the fixtures served and the normal daily use of the fixtures will draw down from the reservoir often enough to avoid prolonged water storage.
Explanation:
Vacuum breakers are normally used to protect water heaters, sill cocks and hose bibs from backflow dangers.
Explanation:
Some pipe manufacturers list measurement in one-foot increments when rolls of pipe are 100' or over, but do not list increments on joints of 21', 20' or less. Brand names, psi rating, and nominal pipe size are required.
Explanation:
Any gray water going into a gray-water collection reservoir is required to be filtered. This is required as a means of blocking solids from entering the collection reservoir. While the fixtures allowed for the recycling of gray water should not be transporting solids there is always a possibility that some type of solid could find its way into the drainage water. The filters stop these impurities from reaching the collection of gray water that will be recycled.
Explanation:
The minimum unobstructed opening of egress for a shower door installed on a typical shower is 22 inches.
