Installation

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
9
SECTION B - TEES, ELBOWS, INCREASERS
90° TEE (T90)
1. Generally used to connect the horizontal length from the appliance to the
vertical length when clean-outs access or drain is required.
2. 90° should not be used for changing flow direction in diesel or turbine
exhaust.
3. For supporting the tee, the preferred location is above the tee (see figure
9).
4. If it is not possible to suspend the tee, it may be supported from the
base (see figure 10). When this is necessary, a short length should be
installed between the tee and the tee cap or Drain-Tee Cap for a good
clean-out or inspection access.
IMPORTANT NOTE:
If more than 1/4” of thermal expansion is expected between a stationary
point and the tee, the use of an expansion length and a two axis support
is recommended to minimize bending moments on the tee (see figure 11
and table 9).
Gas Temperature Rise Maximum Length Expansion
200°F 12’0” 0.25”
300°F 8’0” 0.25”
400°F 6’0” 0.25”
500°F 5’0” 0.25”
600°F 4’0” 0.25”
700°F 3’6” 0.25”
800°F 3’0” 0.25”
900°F 2’6” 0.25”
1000°F 2’0” 0.25”
Note: 60°F - 70°F ambient T°
Table 9 - Maximum allowable length between two fixed points
without expansion length
Figure 10 - Base Supported Tee
45° TEE (T45)
1. For systems where flow resistance must be minimized like engine or
turbine exhaust. The use of a 45° tee is suggested. It can be combined
with a 45° elbow to make a smooth 90° turn (see figure 12). To support
this tee, use similar method as a 90° tee.
2. When using 45° tee to connect multiple appliances together, thermal
expansion must be considered. Thus prepared to prevent bending mo-
ments on the tee, an expansion length must be installed between the tees
(see figure 13).
45° TEE Y (TY)
1. This kind of tee is useful where the stack is located between two applica-
tion or with a double exhaust system. Use the same support method and
thermal expansion considerations from the other tees (see figure 14).
Figure 9 - Suspended Tee
Wall
Support
Tee
Tee Cap or
Drain-Tee Cap
Wall Support
Tee
Tee Cap or
Drain-Tee Cap
Short Length
Lengths
Stationary
Support
Suspension
Band
Expansion
Length
Stationary
Support
More than 1/4” of expected thermal
expansion between two stationary points
Figure 11 - Two Axis Support
Figure 12 - Smooth 90° Turn
Appliance
Expansion
Length
45° Elbow
45° Tee Y
Increaser
Figure 14 - 45° Tee Y
Stationary / Fix
Support
Increaser
Expansion
Length
45° Tee
Appliance Appliance
Appliance
Figure 13 - Multiple appliance connection with 45° tees