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§ 1593.56
<br />DWELLING HOUSE CODE
<br />which the valve is set to relieve. Pressure
<br />relief valves may be installed in either the
<br />cold or hot water line adjacent to the tank
<br />or heater and shall be set to open at a pres-
<br />sure not in excess of the rated working
<br />pressure of the tank or heater. Combination
<br />pressure and temperature relief valves shall
<br />be installed as provided in .subsection
<br />1593.55 (b) .
<br />(b) Temperature relief. On all equipment
<br />in which water for domestic use is heated
<br />or stored under pressure and in which the
<br />temperature can be raised above 212 F, an
<br />approved temperature relief valve or device
<br />shall be installed. Such device shall conform
<br />to the requirements of the American Stand-
<br />ard Listing Requirements for Relief and
<br />Automatic Gas Shut-off Valves for Use on
<br />Water-Heating Systems (ASA 221.22) or be
<br />approved by other accredited agency. Such
<br />devices shall be installed in the hot water
<br />line within 5 inches of tank outlet or directly
<br />in a separate tapping provided in the hot
<br />water storage tank and within 6 inches of the
<br />top. The temperature relief valve shall be
<br />set to prevent the storage of hot water at a
<br />temperature higher than 210 F. The tem-
<br />perature relieving capacity of a temperature
<br />relief valve, or temperature element of a
<br />combined valve, or the combined capacities
<br />of a multiple valve installation shall be not
<br />less than the gross input of all connected
<br />heaters and shall be rated in terms of the
<br />maximum permissible hourly Btu heater in-
<br />put which the device can relieve.
<br />(c) Vacuum relief valves. All copper
<br />storage tanks and direct-fired domestic
<br />water-heaters must be protected against col-
<br />lapse or the siphoning of water therefrom un-
<br />der conditions of negative pressure. A vacu-
<br />umrelief valve shall open with a vacuum not
<br />exceeding 3" water column, and shall have
<br />a capacity to pass a minimum of 15 cubic
<br />feet of air per minute with a vacuum of 36"
<br />water column. Vacuum relief valves shall be
<br />installed in the cold water supply line on a
<br />level with or above the top of the tank or
<br />heater. .
<br />(d) Check valves. Check valves shall not
<br />be installed anywhere in the cold water
<br />supply pipe leading to an existing water
<br />heating system unless suitable pressure re-
<br />lief valves and temperature relief devices
<br />are also installed and where relief valves are
<br />installed at or adjacent to a copper tank.
<br />(e) Identification and marking o f sa f ety
<br />devices. All relief valves and other safety
<br />devices installed as required by Section
<br />1593.55 shall be identified with maker's
<br />name, address, type or model number, pres-
<br />108
<br />sure and temperature setting and tempera-
<br />ture relieving capacity, clearly marked on
<br />the valve. Identification may be cast,
<br />stamped, or etched on the valve or on a
<br />marking place or tag securely attached to
<br />the valve.
<br />(f) Approval o f safety devices. Relief
<br />valves and other safety devices which meet
<br />the requirements of this Dwelling House
<br />Code and have been tested and approved by
<br />The American Gas Association or an ac-
<br />credited testing laboratory may be approved
<br />by the Building Official without additional
<br />tests provided that the label of the testing
<br />authority be placed on the approved device,
<br />(g) Intermediate shut-o f j` for hot water
<br />storage tanks prohibited. No stop-cock,
<br />valve, or check valve shall be installed be-
<br />tween ahot water storage tank and a pres-
<br />sure relief valve or temperature relief de-
<br />vice. No shut-off valve or stop-cock shall be
<br />installed in circulator lines between water
<br />heaters and hot water storage tanks.
<br />(h) Hot water storage tank relie f outlet
<br />connections. All relief outlets of pressure
<br />and temperature relief valves shall be piped
<br />to a position which will protect persons and
<br />property. Where such outlets are connected
<br />to discharge into the drainage system, such
<br />piping shall be connected as in indirect
<br />waste. Piping from relief outlets shall be
<br />equal to or greater than the cross-sectional
<br />area of the discharge outlet on the relief
<br />valve or device.
<br />1593.56 Soul and waste piping.
<br />Soil and waste piping for drainage sys-
<br />tems within a building other than under-
<br />ground building drain shall be of cast-iron,
<br />galvanized wrought iron, galvanized open-
<br />hearth iron, galvanized steel, brass, capper,
<br />lead or other approved material. In houses
<br />with basements or cellars where the area of
<br />the basement or cellar is less than the total
<br />area of the first floor, soil and waste piping
<br />running through a crawl space or unexca-
<br />vated portion shall be of said metal piping
<br />continued to the basement level of the build-
<br />ing drain or to the building sewer. Such pip-
<br />ing in contact with the ground shall be, of
<br />cast iron. The pipe and the fittings for each
<br />type of pipe shall conform to the applicable
<br />specifications listed in TeaLE 93A.
<br />1593.57 Building drain, building storm
<br />drain.
<br />Except as provided in Section 1593.56,
<br />underground drain pipe, within a building
<br />and to a point 5 feet outside the inner face
<br />of the building wall, shall be of cast-iron,
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<br />Definitions and Abbreviations
<br />otherwise separate water-supply systems,
<br />one of which contains potable water and
<br />the other water of unknown or question-
<br />able safety, whereby water may flow from
<br />one system to the other, the direction of
<br />flow depending on the pressure differen-
<br />tial between the two systems.
<br />Curb connection. The sewer extending from
<br />the main sewer to the curb line,
<br />1517.05 Letter "D "
<br />Dead end. A branch leading from a soil,
<br />waste, vent, building drain, or building
<br />sewer, which is terminated at a developed
<br />length of 2 feet or more by means of a
<br />cap, plug, . or other closed fitting.
<br />Design. When used in this Dwelling House
<br />Code, shall include "sketches and/or com-
<br />putations pertaining to structural, heating,
<br />plumbing, electrical and other mechanical
<br />work, and shall not include the general
<br />planning, layout or aesthetic treatment of
<br />a dwelling house or site.
<br />Developed length. The length of a line of
<br />pipe, between any two designated points,
<br />measured along the center line of the pipe
<br />and fittings.
<br />Diameter. Unless otherwise specifically
<br />stated, the term "diameter" is the nominal
<br />inside diameter of a pipe or fitting.
<br />Dinette. See Room; dinette.
<br />Direct-fired unit heater. Aself-contained
<br />heat appliance of the fan type which uses
<br />liquid or gas fuel far heating of the heat
<br />emitting element.
<br />Direct flush valve. See Flushometer valve.
<br />Downspout. The water conductor from the
<br />roof to the building storm drain or other
<br />piping serving as a storm drain.
<br />Dra f t hood. A device, built into an appliance
<br />or made a part of the smokepipe, flue or
<br />gas vent connector from an appliance,
<br />which is designed to;
<br />1. Provide the escape of the products of
<br />combustion in the event of no draft, back
<br />draft or stoppage beyond the draft hood,
<br />and
<br />2. Prevent a back draft from entering the
<br />appliance, and
<br />3. Neutralize the effect of stack action of
<br />the chimney, flue or gas vent upon the
<br />operation of the heat appliance.
<br />Draft regulator, automatic. See Barometric
<br />damper.
<br />Drawn or drain pipe. Any pipe which carries
<br />waste water or water-borne wastes in a
<br />building drainage system.
<br />Drainage system, or drainage piping. All the
<br />§ 1517.05
<br />piping within public or private premises
<br />which conveys sewage, storm water or
<br />other liquid wastes to a point of disposal
<br />permitted by this Dwelling House Code,
<br />and shall include the building drain and
<br />building sewer but does not uiclude the
<br />curb connection, a public se~mer system,
<br />or a private or public sewage-treatment
<br />or disposal plant.
<br />Dry vent. Any vent that does not carry
<br />water or waterborne wastes,
<br />Dry wall finish. An interior wall or ceiling
<br />finish of wallboard or similar material,
<br />other than applied plaster.
<br />Dual vent. See Common vent,
<br />Duct. A tube, pipe or continuous enclosed
<br />passageway used for the conveying of air,
<br />gases or vapors.
<br />Durable. As applied to a material, means
<br />that quality of resisting the elements or
<br />other deteriorating factors during the nor-
<br />mal required usage over a period of time
<br />acceptable to the Board of Building Code
<br />Appeals.
<br />Dwelling: A building designed or occupied
<br />as the living quarters for not more than
<br />two families or households; equipped with
<br />heating and separate cooking, living, sleep-
<br />ing, bathing and toilet facilities for each
<br />family.
<br />Detached-. A dwelling which is com-
<br />pletely surrounded by open spaces.
<br />Double-. A two-family dwelling in
<br />which the living units are side by side,
<br />each unit having open spaces on at least
<br />three sides.
<br />Flat. A dwelling, or any floor of a dwelling,
<br />not more than two stories high, each floor
<br />of which constitutes a living unit,
<br />One- f amily -. A building designed and
<br />equipped with living, cooking, sleeping,
<br />bathing, toilet and heating facilities for
<br />one family.
<br />One-story -, A building having its main
<br />roof-eaves line at or below the ceiling con-
<br />struction of the first floor, its finished liv-
<br />ing space on one floor level, provided the
<br />usable floor area in the attic space, which
<br />has a clear headroom of 5 feet or more,
<br />does not exceed 50 per cent of the area
<br />of the floor beneath such attic space. See
<br />Story; half -.
<br />Two-family-. A dwelling having sepa-
<br />rate living, cooking, sleeping, bathing,
<br />toilet and heating facilities for two fam-
<br />ilies.
<br />-unit. See Living unit.
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