Specification for Inlet Flow Conditioning Spool
1. General Requirements
1.1. Flow Conditioner Design
The pump manufacturer shall provide a flow conditioner for each pump. The conditioner will consist of a flanged spool piece with an internal flow conditioning grid, as indicated and specified, for all double-suction split case pumps with suctions of 8 inches (200 mm) and larger.
1.2. Certified Drawings
- Submit a certified drawing for review with the pump submittal.
- Include the following details:
- Dimensions
- Weight
- Welding requirements
- Material designations
- Material thicknesses
- Flange details
2. Design Approval
2.1. Hydraulics Laboratory Approval
- The flow conditioning grid design must be approved by a nationally recognized hydraulics testing laboratory.
2.2. Physical Hydraulic Modeling (for sizes larger than 18 inches [450 mm]):
- Provide a design based on physical hydraulic modeling conducted by a nationally recognized hydraulics laboratory.
3. Design Criteria
3.1. Spool Dimensions
- Minimum Length: 1 x pipe diameter
- Ends: Flanged per ANSI 150-lb specifications
- Type: Van Stone flat face rings and back-up flanges
3.2. Grid Dimensions
- Minimum Length: 1 x pipe diameter
- Thickness: 0.125 inches (3 mm)
- Grid Spacing: 4 inches (100 mm) nominal
- Velocity: Maximum 7 ft/s (2.13 m/s)
4. Materials
4.1. Spool
- Type 316L A778 welded stainless steel pipe, Schedule 10S
4.2. Van Stone Flat Face Rings and Back-Up Flanges
- Type 316L stainless steel
4.3. Hardware
- Type 316 stainless steel
5. Finish Requirements
5.1. Pickling and Passivation
- Completely immerse the spool in a solution for a minimum of 15 minutes as follows:
- 10% nitric acid
- 3% hydrofluoric acid
- Temperature: 125°F
- Follow with a neutralizing rinse.
6. Approved Manufacturers
6.1. The following manufacturers are approved for the flow conditioning spool:
- Flow Optimizers, LLC
- Or Engineer-Approved Equal