What is tube expansion in heat exchanger?
Tube Expanding is the process of reducing a tube wall by compressing the outer diameter (OD) of the tube against a fixed container, such as rolling into tube sheets, drums, ferrules, or flanges. To assure a proper tube joint, the tube wall must be reduced by a predetermined percentage.
Is standard for heat exchanger?
1.1 This specification covers the design, consstruction, inspection and testing of cylindrical shell and plain tube heat exchangers for application in the petroleum and general chemical industry.
How do I choose a tube expander?
Tube expanders come in two different roll lengths: short and long roll. In order to determine the correct roll length, you will need to know the tube sheet thickness. Choose the roll length that will expand the tube sheet area in the least amount of expansions.
What is a tube expander used for?
Tube Expanders are rolling tube type expansion tools used for fixing and molding tubes to tube sheets in the manufacturing processes of heat exchangers such as boilers and condensers.
What is api660?
API 660, Shell-and-Tube Heat Exchangers, is a standard developed and released by the American Petroleum Institute (API) that covers specific requirements for the mechanical design, material selection, fabrication, inspection, testing, and shipping of shell-and-tube heat exchangers for the petroleum and petrochemical …
What is tube rolling for amps?
Tube rolling is the process of trying out a number of tubes in the same spot in an amplifier and selecting the one that sounds best to you. This can be very helpful in optimizing the tone of the amplifier. CAUTION: Tube amplifiers run on dangerous high-voltages and the tubes get very hot during operation.
What is Hei standard?
The primary purpose of HEI is to develop and publish standards which advance the technology, increase the efficiency, and promote the use of heat exchange and vacuum apparatus.
What is boiler tube rolling?
don’t have a boiler. You just have a vessel of water that isn’t going to produce any steam. This is when a special roll tool is used to “roll” the boiler tube into a secure fit within the tube sheet. In plain English, this means forcefully pressing the tube out against the tube sheet to seal it.
How do I keep my tubes from rolling?
This can be done by using one of the following methods:
- Staking Tubes. Tubes can be staked or clamped on the tube’s opposite end so the tube cannot rotate.
- Holding Expander Collar. Holding the tube expander’s thrust collar from rotating typically will keep the tube from spinning.
- Knurling Expander Collar.
What are the types of heat exchanger?
Let’s take a look at the 4 types of heat exchangers and their applications below:
- Double Tube Heat Exchangers: Double tube heat exchangers use what is known as a tube within a tube structure.
- Shell and Tube Heat Exchangers:
- Tube in Tube Heat Exchangers:
- Plate Heat Exchangers:
Which American Standard is used for design of heat exchangers?
Why is it called tube rolling?
What Is Tube Rolling? Simply put, tube rolling is the process of trying out a variety of different tubes in the same socket in an amplifier in order to find the one that sounds best to you. The name comes from the circular rolling motion used to slide the tube’s connection pins out from their sockets in the amp.
What kind of expander does a heat exchanger use?
If no tube projection is specified, the tube expander will come with a flush collar to expand the tube flush to the tube sheet. Tube expanders come in two different roll lengths: short and long roll.
When to use a long reach heat exchanger?
Long reach expanders are used in heat exchangers with thick tube sheets or when reaching through water boxes, found in air coolers. Heat exchangers with channel boxes or division plates where the tubes are positioned too close to a wall for the expander’s collar to access perimeter tubes will require a friction collar.
What are the channels in a shell and tube heat exchanger?
Channels (Heads) Channels or heads are required for shell-and-tube heat exchangers to contain the tube side fluid and to provide the desired flow path. Many types of channels are available. The three (3) letters TEMA designation is the standard method for identifying the type of channels and the type of shell of shell-and-tube heat exchangers.
When to roll a tube in a heat exchanger?
In situations where the tube sheet is thicker than the length of the rolls, step rolling may be necessary. It is recommended to roll from the back of the tube sheet to the front of the tube sheet to allow tube growth to flow towards the operator or outside of the tube sheet.