Question

The slope of drainage in a dairy plant is usually kept

• A. 1:10
• B. 1:12.5
• C. 1:15
• D. 1:100

Hint:

Dairy Plant Civil Standards: Standard sanitary floor drainage slope = $\mathbf{1:100}$ (1 cm per 100 cm). Drain channels slope = $1:50\text{ to } 1:100$.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Sanitary dairy plant civil design and effluent drainage hydraulics: floor and drain channel gradients are standardly maintained at a slope of 1:80 to 1:100 ($1.0-1.25\%$, or $1 ext{ cm per 1 meter}$) to ensure rapid, self-cleaning runoff of wash water without pooling or creating slipping hazards.
Key Formula or Approach:
\[ \mathbf{Sanitary \text{ } Floor \text{ } Slope} = \mathbf{1:100} \quad (1\% \text{ Gradient } \equiv 10\text{ mm fall per 1000 mm run}) \]

Step 2: Detailed Explanation:
In dairy plant layout, civil engineering, and sanitary plant hygiene:
- Dairy floors are subjected to continuous washings with hot water, milk spillage, acid/alkali CIP solutions, and sanitizers:
1. Floor surfaces must slope uniformly toward drainage gullies (trapped floor drains) to prevent stagnant puddle pooling of milk effluent (which fosters microbial biofilm and odor).
2. Recommended Standard Slope (D):
- For processing halls, milk reception docks, and packaging rooms: 1:100 (1 in 100 or 1.0% slope 10 mm per meter) (or up to $1:80$ for wet rooms).
3. A steeper slope (like $1:10$ or $1:15$) would create dangerous slipping hazards for plant operators and cause mobile dairy equipment/trolleys to roll unintentionally.

Step 3: Final Answer:
Hence, the slope of drainage is usually kept 1:100, matching option (D).