MCAC-VTSM-2011-09
Installation
Duct Engineering
101
4. Drainage Pipe Engineering
4.1 Installation Highlights of Drainage Pipe
4.1.1. Installation principle of drainage pipe:
1) Slope; 2) reasonable pipe diameter; 3) nearby discharge
4.1.2. Installation highlights of drainage pipe:
1. Before installing condensate water pipeline, determine its route and elevation to avoid intersection
with other pipelines and ensure slope is smooth and straight.
2. Make sure that the two horizontal fluid pipes shall avoid encountering, and preventing flow backwards
and drainage difficulty.
a. Correct connection:
b. Incorrect connection:
Advantages of correct connection:
1. Do not cause flow backwards of one pipe.
2. The slope of two pipes can be regulated separately.
Disadvantages of incorrect connection:
1. Interfere drainage.
2. The side of branch pipe with large quantity of fluid volume will flow to the side with small quantity, thus
leading to the water backwards of branch pipe with small quantity.
3. Suspender gap:
In general, the horizontal gap is 0.8m-1m and the vertical gap is 1.5m-2.0m. Each vertical pipe shall be
equipped with not less than two suspenders. Overlarge suspender gap for horizontal pipe shall create
bending, thus leading to air resistance.
4. The highest point of drainage pipe shall be designed with air hole to ensure that condensate water
could be discharged smoothly. The outlet air hole shall face down to prevent dirt entering pipe.
5. After finishing connection, conduct water passing test and overflowing water test to pipelines to check
the smoothness of drainage and leakage of pipeline system.
6. Use specific glue to adhesive the seam of thermal insulation materials, and then bind with rubber or
