How do you inspect a heat exchanger tube?

How do you inspect a heat exchanger tube?

There are 3 methods used to inspect heat exchanger tubes—eddy current testing, internal rotary inspection, and visual inspection with a videoscope—and each have their own advantages.

Which double pipe exchanger is more efficient and why?

They can also be used in parallel flow where both fluids move in the same direction, but counterflow is often the most thermally efficient regime. Double pipe exchangers can handle high pressures and high temperatures because they are able to freely expand and have solid, simple construction.

What is tube inspection?

These systems are used for detecting and sizing metal discontinuities in a wide range of equipment such as boilers, feedwater heaters, air coolers and heat exchangers. …

How do you calculate pressure drop in a double pipe heat exchanger?

Background on Pressure Drop Calculation for Pipe Flow

1. hL = frictional head loss, ft-lb/lb.
2. L = pipe length, ft.
3. D = pipe diameter, ft.
4. V = average flow velocity of fluid (= Q/A), ft/sec.
5. g = acceleration due to gravity = 32.2 ft/sec2.

What are the stages of inspection for tube sheet?

Examination of tube bundle assembled in tube plate(s). Witnessing pressure tests and leak tests where applicable. Final examination and checking of exchanger dimensionally against the drawing. Checking marking and stamping of the exchanger and examination of final documentation.

What is double pipe?

A double pipe exchanger consists of one or more pipes or tubes inside a pipe shell. Basically two straight pipe lengths are connected at one end to form a U or “hair-pin.” Longitudinal fins may be used on the outside of the inner tube.

What are the disadvantages of double pipe heat exchanger?

Disadvantages of Double Pipe Heat Exchangers It does not mean that they cannot be used in parallel flow. They have limitations in heat transfer rather than complicated designs and should be used in low heat duties. Leaking is more often in this type (paired with more units)

What is pressure drop in heat exchanger?

Pressure drop refers to loss of pressure throughout the journey a fluid takes within the heat exchanger.

How do you know if heat exchanger is bad?

Six Signs Your Furnace Heat Exchanger May be Cracked

1. Strange smells. A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde.
2. Soot Build-up.
3. Corrosion & Cracks.
4. Change in the flame appearance.
5. Audible Sounds.
6. Presence of Carbon Monoxide.

How do I know if my secondary heat exchanger is bad?

What are the Signs of a Plugged Secondary Heat Exchanger?

1. The condensate in your condensate drain pan is brown or black. The dirty drain pan is a sign that the condensate is carrying unwanted debris to the drain pain.
2. Your carbon monoxide alarm goes off.
3. A Pungent Odor.
4. Water Leaking from the Furnace.

When do you need a double pipe exchanger?

Double-pipe exchangers are useful when not more than 100 to 150 ft 2 of heat exchange surface area are required. Beyond this range, it becomes more economical to bundle many tubes in a single shell and avoid the weight of metal required by adding larger pipes or additional passes in a series or parallel arrangement.

What are double pipe heat exchangers and their working principles?

What are Double Pipe Heat Exchangers and Their Working Principles? Double Pipe Heat Exchangers- Heat exchangers are devices that transfer or exchange heat between two fluids without mixing and include various types depending on the design, application, required space, and the fluid flows in the system.

What kind of heat exchanger has no chance of leaking?

This is possible by constant monitoring of pressure differentials and by visual observation for the actual leaks as in the double-tubesheet heat exchanger. The double-concentric-tube type, because of its construction, has little or no chance for leakage to occur. There are many types of heat exchangers.

How are the tubes in a heat exchanger supported?

The bundle of tubes in a shell-and-tube heat exchanger must be supported in some fashion within the shell so as to maintain the proper spacing for uniform and efficient heat transfer between the fluids. This is done by fastening the tubes to holes in a flat disc called a tubesheet.