Description
API Plan 1 Internal Circulation in Pump – Single Seals with Internal Flush
Plan 01 is a mechanical seal flush arrangement that utilizes an internal recirculation path from the pump discharge area directly into the seal chamber. Unlike Plan 11, which uses external piping, Plan 01 is entirely internal, meaning there is no exposed piping. This design is particularly advantageous in applications where external piping is impractical or poses a risk of contamination or freezing.Plan 01 is an efficient and cost-effective flush plan for single mechanical seals in applications involving clean, low-temperature fluids. Its internal design eliminates the need for external piping, reducing the risk of contamination, freezing, and maintenance. However, it is critical to ensure the fluid is clean and free of particulates to avoid clogging the internal recirculation path. For vertical pumps or applications with dirty fluids, alternative flush plans such as Plan 11 or Plan 32 should be considered.
Key Features:
- Internal Recirculation: The flush fluid is drawn from the pump discharge and routed internally to the seal chamber, eliminating the need for external piping.
- No Product Contamination: Since the flush fluid is sourced from the pump discharge and remains within the pump, there is no risk of external contamination.
- Compact Design: The absence of external piping makes this plan ideal for applications with space constraints or where external piping is undesirable.
- Suitable for Viscous Fluids: Plan 01 is particularly effective for handling highly viscous fluids at lower temperatures, as the internal recirculation minimizes the risk of freezing that can occur with exposed piping arrangements.
Advantages:
- No External Piping: Eliminates the risk of leaks, damage, or freezing associated with external piping.
- Reduced Maintenance: Fewer components (no external piping or fittings) mean lower maintenance requirements.
- Improved Safety: The internal design reduces the risk of exposure to hazardous fluids.
- Cost-Effective: Lower installation and maintenance costs due to the simplified design.
Technical Considerations:
- Clean Fluids Only: Plan 01 is suitable only for clean, non-particulate-laden fluids. Dirty or abrasive fluids can clog the internal recirculation line, leading to seal failure.
- Not Recommended for Vertical Pumps: In vertical pump applications, the internal recirculation path may not provide adequate lubrication to the seal faces, increasing the risk of premature wear or failure.
- Temperature Limitations: While Plan 01 is advantageous for low-temperature applications, it may not be suitable for high-temperature fluids where cooling is required.
Applications:
- Clean, non-abrasive fluids such as light oils, water, or chemicals.
- Low-temperature environments where external piping could freeze.
- Compact pump designs where external piping is impractical.
Limitations:
- Unsuitable for dirty, abrasive, or particulate-laden fluids.
- Not recommended for vertical pumps due to potential lubrication issues.
