Carbon Steel Pipe Low Temeprature Rating

Noritz Debuts Eco-Friendly NRC98 Tankless Water Heater, Featuring Higher ...

FOUNTAIN VALLEY, CA -- The ENERGY STAR-rated NRC98, the newest addition to the Noritz ecoTOUGH™ Series of gas-fired residential condensing tankless water heaters, has an Energy Factor of 0.93, a rating that is nearly 10 points higher than that of a comparably sized, conventional tankless unit. The 0.93 EF is also approximately 30 points higher than a standard, tank-type gas-fired water heater.

With a maximum flow rate of 9.8 gallons per minute (gpm) and temperature settings from 100F to 140F, the new NRC98 protects the environment by heating water strictly on demand, while offering a longer product life cycle than storage tank-type models. In addition, it promises lower emissions, reduced electrical consumption, smaller amounts of potentially hazardous construction materials, and easier recyclability of those materials and components once the product is removed from service.

Featuring a standard Btu input range of 16,000 to 180,000, the NRC98 Tankless Water Heater is engineered to fully meet the domestic hot water needs of northern residences with two bathrooms and southern homes with three baths. A two-pipe direct vent model for indoor installation, the NRC98-DV, will be available for shipment August 1. An outdoor model, the NRC98-OD, will be available during the fourth quarter of this year.

Installation flexibility: Condensing technology permits venting with installer-friendly PVC or CPVC piping, instead of Category III Stainless Steel. The less costly, zero clearance plastic piping enables longer vent runs - up to 62 linear feet with 3-inch PVC - and therefore greater installation flexibility. A PVC adapter built into the flue of the NRC98-DV speeds the vent connection, and a factory-supplied increaser fitting facilitates the creation of a 4-inch run, if required.

Both of the new NRC98 models also offer the following key features and components:

LOWER EMISSIONS: The high-efficiency, low-NOx Eco-Burner has a nitrogen-oxide emissions level of 20 parts per million (ppm), which will comply with the new South Coast Air Quality Management District (SCAQMD) regulations that go into effect on January 1, 2012. The new regulations apply to any boiler or water heater rated from 75,000 to 400,000 Btu per hour.

TRUE TANKLESS EFFICIENCY: The advanced technology of the fully modulating Eco-Burner also delivers superior temperature control, eliminating the need for a buffer tank to stabilize the temperature. This, in turn, removes another potential source of standby heat loss, thus maintaining system efficiency.

Properties and Applications of Ferritic Grade 404 Stainless Steel ...

Applications of Ferritic Stainless Steel

Benchwork, cold-water tanks, whitegoods, refrigeration cabinets, chemical and food processing, water treatment plant, street furniture, electrical cabinets. 404 can be substituted for 304 in most applications except structures and pressure vessels.

Toughness of Ferritic Stainless Steel 404

Toughness 404 has the same ferritic microstructure as carbon steel, so undergoes a ductile-to-brittle fracture mode transition at low temperatures.  404 is tough in the welded condition down to 0°C, and can be used for non-structural purposes at lower temperatures .

Heat Treatment of Ferritic Stainless Steel 404

Heat Treatment 404 is not hardenable by heat treatment. Heat treatment is rarely required in sheet metal applications, but  404 can be annealed at 820 – 900°C, rapid air cool.

Corrosion Resistance of Ferritic Stainless Steel 404

Corrosion Resistance The chemical composition of 404 gives it a higher Pitting Resistance equivalent (PRe) than 304, which indicates at least equivalent pitting corrosion resistance. Pitting is the form of corrosion stainless steels are often least resistant to. laboratory tests and service experience have not identified circumstances in which the corrosion resistance of 404 is inferior to 304, except pitting propagation rates, which are 3 – 4 times faster. unfortunately, once initiated, pitting corrosion propagation is rapid for both grades, and practical selection of stainless steel aims to avoid pitting corrosion rather than achieve low propagation rates.

Figure 1. Resistance to the initiation of pitting corrosion in artificial seawater at 30°C. Shows equivalent resistance to pitting corrosion initiation for the general purpose grades 304 and AWM 404GP

Atmospheric Corrosion of Ferritic Stainless Steel 404

As a ferritic grade, 404 does not stress corrosion crack in drinking water, unlike 304 which may stress corrosion crack above about 50°C. The titanium in 404 prevents sensitization to intergranular corrosion by welding.

1991 Annual Book of ASTM Standards: 04. Plastic pipe and building products

Handbook of Valves and Actuators

Encyclopedia of Chemical Processing and Design, Volume 41 - Polymers: Rubber Modified to Pressure-Relieving Devices: Rupture Disks: Low Burst Pressures

Heat treating, proceedings of the 18th conference : including the Liu Dai Memorial Symposium, 12-15 October, 1998

Steel pipe, a guide for design and installation