Steam–Heating Systems

Steam-heating systems may be classified according to any one of, or a combination of, the following heating features: (A) by the piping arrangement; (B) by the pressure or vacuum conditions obtained in operation; (C) by the method of returning condensate to the heating boiler.
A. By the Piping Arrangement:

1. A steam-heating system is known as a one-pipe heating system when a single main serves the dual purpose of supplying steam to the heating heating and conveying the condensate from it. Ordinarily there is but one connection between the main and the heating unit which must serve as both the supply and the return, although separate supply and return connection may be used.
2. A steam-heating system is known as a two-pipe heating system when steam and condensate flow to and from the heating unit in separate mains and branches.

3. The heating systems may also be described as up-flow and down-flow, depending on the direction of steam flow in the risers, and as a return heating system or a wet-return system, depending on whether the condensate mains are above the water line in the heating boiler or condensate receiver.

B. By Pressure or Vacuum Conditions:

1. Steam-heating systems may also be classified as high-pressure, low-pressure, vapor, and vacuum systems, depending on the pressure conditions under which the heating system is designed to operate.
2. A heating system is known as a high-pressure system when the operating pressures employed are above 15 psi, as a low-pressure system when pressures range from 0 to 15 psi: as a vapor heating system when the system operates under both vacuum and low-pressure conditions without the use of a heating vacuum pump: and as a vacuum system when the heating system operates under low-pressure and vacuum conditions with the use of a vacuum pump.

3. When heating automatic controls are employed to vary the pressure conditions in the system in accordance with outside weather conditions, the system may be known as a sub-atmospheric, differential, or synchronized heating system. These latter classifications are proprietary designations.
4. When heating orifices are employed on the inlets to the heating units, the heating system may be known as an orifice system.

C. By Method of Returning Condensate:

1. When condensation can be returned to the heating boiler by gravity, the system is known as a gravity-return system. All heating units in a gravity-return system must be located sufficiently above the water line of the boiler so that the condensation can flow freely to the boiler. The elevation of heating units above the water line must be sufficient to overcome pressure drop due to flow as well as pressure differences between supply and return piping due to operating conditions.
2. When conditions are such that condensation cannot be returned to the boiler the action of gravity, either traps or pumps must be employed to return the condensation to the boiler. and the system is known as a mechanical-return system. There are three general types of mechanical- return devices in common use ~kith mechanical-return systems today. These are the alternating-return trap, the condensate-return pump. and the vacuum-return pump.




3. In systems where pressure conditions in the system vary between that of a gravity-return and a forced-return system, a boiler return trap or alternating receiver is employed. and the system may be known as an alternating-return system.
4. When condensate is pumped to the boiler under atmospheric pressure or above the stem is known as a condensate-return pump system.
5. When condensate is pumped to the boiler under vacuum conditions, the system is known as a vacuum heating pump-return system. In either the condensate or vacuum pump-return systems, it is highly desirable to arrange for gravity flow to a receiver and to the pump. The pump then forces the condensate into the boiler against boiler pressure.

Best Rated Gas Cooktops - Ramblewood GC2-48N Review

If you only have one stove, and want more cooking ability in your kitchen, you can't do better than a 2 burner gas cooktop. Homes that have only one stove and lots of people in the same household can especially benefit from this 2 burner gas cooktop.That means certain family members can use the stove, while the other household members can use the cooktop. It certainly eliminates any frustrations that would arise from everyone in the house needing to use the stove. Now you have options, see?

This Ramblewood GC2-48N Gas Cooktop fits nicely on most any countertop and can be taken to any house or location that you want. As long as there's a natural gas hookup, you'll be able to use this model even without electricity.

Ramblewood high efficiency 2 burner gas cooktop(Natural Gas), GC2-48NImagine the power goes out. What options do you have to cook your food? The microwave won't work. The stove is disabled because it's an electric model. That's where this natural gas cooktop burner comes in handy. And in outdoor cooking type of scenarios, if you have a natural gas cylinder, you'll be able to cook your food just like you would at home.

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This model only comes with two burners, but how many do you really need? Most people can get by just fine with the 7,000 BTU bottom hob and the 11,000 BTU top hob without having to slow down their cooking efforts. The burners cook food quickly, and for people that are used to working with a flame, this is by far the best choice.The high efficiency performance of this natural gas cooktop means you save money on gas expenses. The burners on the Ramblewood Gas Cooktop are designed to be highly efficient and save you money over the cost of less efficient models.

You can save 20% to 30% on costs if you use it regularly, and there's nothing better than a gas cooktop that saves you money and cooks great food at the same time.

Ramblewood GC2-48N Features:

• Two Gas Burners 7,000 BTU Bottom And 11,000 BTU Top
• Highly Efficient Design Saves You 20%-30% On Natural Gas Consumption
• Ceramic Glass And Cast Iron Construction
• Manual Electric Ignition
• Auto Gas Supply Shut Off Safety Mechanism

Ramblewood GC2-48N Pros:

• Glass surface is easy to clean up
• Burns fuel very cleanly and efficiently - The savings add up the more you use it
• Compact design will fit on pretty much any countertop
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Ramblewood GC2-48N Cons:

• On/Off gas knobs are a little too close to the main burner
• Burners are a bit too close together for some peoples liking
• Comes with only manual ignition - You push the knob down and it lights - With other stoves the ignition is activated by turning the knob to maximum