5.4 Double-Sleeve Thimbles

If the exhaust pipe should need to pass through a wall or roof, an exhaust thimble must be used to prevent exhaust pipe heat from being transmitted to the combustible material. Construction details for a typical double-sleeve thimble to be used where exhaust piping passes through a combustible roof or wall are shown in Figure 5-4. They are usually fabricated at a local sheet metal shop to the specifications furnished by the installation engineer.

The thimbles should be constructed so that they extend at least 10 inches (25.40 cm) both ways from the surface of the wall or roof. Holes are provided at both ends to allow cooling air to circulate through the thimble. If screening is used on the outer end to keep birds, rodents, etc., from entering the thimble, make sure that the mesh is large enough so that it doesn’t impair air circulation through the thimble. If the exhaust pipe must exit through a roof, a rain shield must be included above the thimble as shown in Figure 5-4. The rain cap as shown on the end of the exhaust pipe is recommended only in areas not subject to freezing temperatures. In an area where freezing is common, extend the exhaust

1

7

10

15

2

6

3

9

8

4

65

11

12

piping well beyond the roof and use a gradual “U” bend at the end to direct the exhaust outlet downward which will keep rain, snow, etc., out of the pipe. The outlet of the pipe should be far enough from the roof to prevent ignition of the roof material from hot exhaust.

14

13

TP-5700-5

1.Rain cap (or gradual U bend)

2.Rain shield

3.10 in. (254 mm) minimum

4.1 in. (25 mm) minimum

5.Exhaust pipe

6.Ventilation holes at both ends

7.10 in. (254 mm) minimum

8.1 in. (25 mm) minimum

9.Flashing

10.Inner sleeve

11.Outer sleeve

12.Thimble outer diameter

13.10 in. (254 mm) minimum outside

14.10 in. (254 mm) minimum inside

15.Exhaust pipe diameter

Figure 5-4 Double-Sleeved Thimbles and Rain Cap

TP-5700 7/93

Section 5 Exhaust System 23

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Kohler 20--2800 kW manual Double-Sleeve Thimbles, Double-Sleeved Thimbles and Rain Cap
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20--2800 kW specifications

The Kohler 20-2800 kW generator series is renowned for its exceptional performance and reliability, making it a prime choice for various industrial and commercial applications. Designed for continuous and backup power generation, these generators are capable of providing robust energy solutions for facilities that demand high capacity and efficiency.

One of the standout features of the Kohler 20-2800 kW series is its advanced technology integration. Kohler utilizes the latest in digital control systems, ensuring precise monitoring and management of generator functions. The generator's control panel provides real-time data on power output, fuel consumption, and operating conditions, allowing operators to make informed decisions quickly.

In terms of fuel efficiency, the Kohler generators are engineered to minimize operational costs while maximizing performance. The series includes options for both diesel and natural gas, offering flexibility depending on user requirements and availability. The efficient fuel consumption not only supports cost savings but also aligns with environmental standards, reducing emissions during operation.

Durability and reliability are key characteristics of this generator series. Kohler buildings are constructed using high-quality materials and components that withstand harsh environmental conditions. System redundancy features and robust cooling systems ensure that the generators can operate continuously without failure, making them ideal for critical power needs.

The Kohler 20-2800 kW series also includes noise-reducing technology, making them suitable for installations in noise-sensitive environments. With options for acoustic enclosures, these generators comply with local noise regulations while delivering powerful performance.

Safety features are integrated into the generator design, including automatic shutdown systems for over-speed, low oil pressure, and high water temperature, ensuring that the equipment operates safely during emergencies.

The modular design of the Kohler 20-2800 kW allows for easy installation and maintenance. Access points for service and diagnostics are strategically placed for convenience, reducing downtime and improving efficiency in upkeep.

Overall, the Kohler 20-2800 kW generator series stands out as a dependable powerhouse, combining advanced technology, fuel efficiency, durability, and safety features to meet the demands of various industries. Whether for data centers, manufacturing facilities, or large commercial buildings, Kohler's commitment to quality and innovation makes these generators an exemplary choice for reliable power generation.
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