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Grease Trap Code Issues in Virginia

Let's break down the requirements and compare them with the grease interceptor language in Virginia Plumbing Code 2021:


Grease Interceptor Language Summary

  1. Installation: Must follow manufacturer's instructions.

  2. Emergency Floor Drain: Required downstream of the interceptor connection.

  3. Specific Connections:

    1. The vertical distance from the sink outlet to the interceptor inlet is ≤ 30 inches.

    2. The total length of waste pipe from the furthest sink outlet to interceptor inlet ≤ 60 inches.

    3. Direct connection for sinks for food utensils, dishes, pots, and pans.


Section 802.1 Summary

  1. Indirect Waste Pipe Requirement: Food-handling equipment and related sinks must discharge through an indirect waste pipe.

  2. Specific Fixtures:

    1. Food Handling Equipment: Discharge through an indirect waste pipe with an air gap.

    2. Food Utensils, Dishes, Pots, and Pans Sinks: Indirect discharge through an air gap or air break.


Comparison and Contradictions

  1. Direct vs. Indirect Connection:

    1. Grease Interceptor: Requires a direct connection for sinks used for washing food utensils, dishes, and pots and pans.

    2. Section 802.1: Requires an indirect connection with an air gap or air break for the same types of sinks.

  2. Emergency Floor Drain:

    1. Grease Interceptor: Requires an emergency floor drain downstream of the interceptor.

    2. Section 802.1: Does not explicitly mention emergency floor drains.

  3. Compliance with Air Gap/Air Break:

    1. Grease Interceptor: No mention of air gaps or air breaks.

    2. Section 802.1: Specifically requires air gaps or air breaks for indirect connections to the drainage system.


Potential Conflicts

  • Direct vs. Indirect Connection: The grease interceptor language requires direct connection, which contradicts the requirement in Section 802.1.7 for sinks to discharge indirectly through an air gap or air break.

  • Air Gap/Air Break Requirement: The grease interceptor section does not address air gaps or air breaks, while Section 802.1 mandates them.


Resolution Approach

  • Consult with local code authorities.

  • Verify if there are any amendments or exceptions specific to the local jurisdiction that might resolve these conflicts.

  • Request the AHJ to give official direction for your project (and ideally publish their recommendations for compliance on their website).

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