is a step-by-step description of all the component parts
of a tube bundle that are required for duplication.
Please note the corresponding component numbers on the
drawing on page five of the .pdf file below.
1. "D" BUNDLE DIAMETER
- This is the overall diameter required to fit the bundle
in an existing shell or tank. This dimension includes
any baffles or tube supports. A good way to get an accurate
"D" diameter to measure the circumference
and divide by 3.14. This gives you the diameter of the
2. "OAL" - OVERALL LENGTH
- Measured from the face of the tubesheet over the entire
length to include the last bend.
3. "T" - TUBESHEET THICKNESS
- Tubesheet thickness varies from 5/8" to 3"
4. "TSD" - TUBESHEET DIAMETER
- The tubesheet diameter is always larger than the "D"
dimension or bundle diameter.
5.-6.-7. BOLT HOLES - Some tubesheets
have bolt holes and some do not. Often the bolts that
go through the head and shell bypass the tubesheet -
that is the bolts go around the tubesheet and not through
it. In this case there is no bolt hole pattern and 5-6-7
are not applicable. The tubesheet is boltless.
8. NUMBER BAFFLES - Please see
not on page five.
9. BAFFLE SPACING - Distance between
baffles or tube supports if there are tube supports
in lieu of baffles.
10. TUBE DIAMETER - Typical tube
diameters are 3/8", 1/2", 5/8", 3/4",
1 1/4" O.D.. Most steam converters and water/water
exchangers are 3/4" O.D.. Please note that 3/4"
O.D. tubes have approximately 5/8" I.D.s . Some
tank heater bundles have 1 1/4" O.D. tubes.
11. TUBE MATERIALS - Most HVAC
exchangers have copper tubes and these are easy to identify.
There are alternate tube materials available if you
need them. Some examples are: 90/10 or 70/30 cupro-nickle,
carbon steel, stainless steel, carpenter 20 or exotic
materials like titanium.
12. TUBE THICKNESS - Most 3/4"
O.D. copper tubes are 18 GA and most 1 1/4" O.D.
copper tubes are 16 GA. USA recommends and uses 16 GA
for both O.D.s. Heavier walls are available if required.
13. STRAIGHT TUBES - Some bundles
have tubesheets at both ends and there are straight
tubes between. Count the number of Straight tubes.
14. "U" TUBES - Most
replacement bundles are "U" tube type. Count
the number of complete "U"s.
15. SHELL or SLEEVE DIAMETER -
Specify the O.D. or I.D. of the unit that the bundle
will slide into. What we are really interested in identifying
is the space available to slide the bundle into.
16. TUBE PASSES - Look at the
tubesheet to identify the number of passes the liquid
or steam makes through the tubes. Most bundles are 2
pass, but can be 4 or 6 pass also.
17. TUBESHEET MATERIAL - Most
tubesheets are carbon steel, because this is the most
economical material available. Alternate materials are:
stainless steel, carpenter 20, titanium, copper faced
steel or brass.
Tube Bundle - Dimensions | "U"
Tube Bundle - How to Measure | Replacement
Tube Bundles & Heat Exchangers
1. Print Instructions on "How to
Measure" clicking on #1 - "U Tube Bundle -
How to Measure."
2. Print "U Tube Bundle - Dimensions"
by clicking #2.
3. Forward filled out "U Tube Bundle
- Dimensions" to Multitherm for pricing or technical