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Description

Product recirculation from seal chamber to pump suction via a flow control orifice.

Features

1. Provides continuous vent for vertical pumps.

Use

1. Wherever Plan 11 is not usable due to low-pressure margin between discharge and seal chamber pressure.

2. Used in vertical pumps.

Caution

1. Check margin between seal chamber pressure and suction pressure.

2. Orifice size should be at least 1/8” (3.2mm).

 
  • Read Our Water Savings Industry Guide

    This paper explains the problems associated with packing, how double mechanical seals with seal support systems solve these problems.

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  • API Piping Plan Booklet

    API Plans are standardized flushing piping arrangements that are widely used in industry. This downloadable pdf booklet describes both configurational parameters and application criteria

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Want an expert piping plan explanation?

Our API expert Richard Smith walks through some of the 4th Edition API Plans, providing expert analysis and explanation of each plan.

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