Archive for January, 2011

Three Piece Booster Pumps

{0 Comments}

Three Piece Booster Pumps

The three-piece booster pump illustrated in Figures 10-11 and 10-12 is an example of the circulators used in small-to medium-size residential and light commercial hydronic heating systems since the 1930s. A typical three-piece booster pump consists of the following three sections: (1) the pump body (also called the volute, body assembly, or waterway), (2) the …

Read More…

Water Circulating Pumps

{0 Comments}

Hydronic heating systems use small compact pumps to provide the motive force to circulate the water in the pipes. They are usually referred to as circulators or water-circulating pumps. The circulator is used to move the water from the boiler to the heat-emitting units and back again. It is not used for lifting, as is …

Read More…

Vacuum Pumps

{0 Comments}

Vacuum Pumps

Vacuum heating pumps are used to maintain the vacuum in mechanical vacuum heating systems by removing air, vapor, and condensation from the lines. Many vacuum pumps are available in both single and duplex units, and are designed to automatically adjust themselves to the varying conditions of the system. The duplex units have an advantage over …

Read More…

Condensate Pumps

{0 Comments}

Condensate Pumps

The design of a conventional gravity-flow steam heating system is such that the heat-emitting units cannot be placed at a level lower than the water level in the boiler. The movement of the condensation depends on gravity and, therefore, must move from a higher to a lower level until it reaches the boiler (at the …

Read More…

Steam and Hydronic System Pumps

{0 Comments}

Heating and circulating pumps are used to maintain the desired flow rate of steam or hot water in a heating system. The two types of pumps used in steam heating systems are (1) condensate pumps and (2) vacuum heating pumps. The condensate pump is used in a gravity steam heating system to return the condensation …

Read More…

Socket-Welding Procedure

{0 Comments}

The procedure for making a socket weld is as follows: 1. Cut the pipe end square, making sure the diameter is not undersize or out of round. 2. Remove all burrs with a metal file. 3. Clean the pipe end, valve joint, and the inside of the valve socket with a degreasing agent to remove …

Read More…

Butt-Welding Procedure

{0 Comments}

The procedure for making a butt weld is as follows: 1. Machine the pipe ends for the butt-welding joint. 2. Clean the pipe ends, valve joint, and the inside of the valve socket with a degreasing agent to remove oil, grease, or other foreign materials. 3. Align by means of fixtures, and tack weld in …

Read More…

Soldering or Silver-Brazing Procedure

{0 Comments}

The basic procedure for soldering or silver-brazing pipe or tubing to valves is as follows: 1. Cut the tube or pipe end square, and make sure the diameter is not undersize or out of round. 2. Remove all burrs with a metal file. 3. Clean the pipe or tubing end (at least to the depth …

Read More…

Valve Installing Pointers

{0 Comments}

Valve Installing Pointers

Unless valves are installed properly, they will not operate efficiently and can cause problems in the system. There are certain precautions you should take when installing valves that will improve their performance and minimize the possibilities of a malfunction. These precautions may be summarized as follows: 1. Always clean out a valve before installation because …

Read More…

Damaged Valve Stems

{0 Comments}

Sometimes the threads on valve stems become worn or damaged, making the valves inoperable. When this occurs, the stems must be replaced. Before the stem can be replaced, however, all pressure must be removed. Then, with pressure removed, disconnect and remove the bonnet and upper valve assembly. The remainder of the procedure depends on the …

Read More…