SWA

S30/31 Resilient Seated Valves

• Nylon 11 Coated Disc -

Excellent for Seawater

Applications

• Special Seat Geometry and Compounding

• Internal Drive Connection Provides Smooth Surface for Coating

• ISO Top Ensures Easy

Automation

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What makes seawater aggressive toward AWWA

valves, or specifically, toward metallic wetted

parts of any valve?

SWA

Chloride Levels

• 80% of Dissolved Solids in Seawater are Sodium Chloride - 1/3 Sodium Ions, and 2/3 Chloride Ions

• Chloride Ions Present in Seawater Range from 18,000 to 19,200 ppm

• Bray Controls Currently Handles Chloride Levels in Excess of 70,000 ppm

SWA

Chloride (ppm)

Body Seat Disc Stem

< 20,000 (ASTM 126 Class B)EPDM/

BUNA-NNylon 11 Coated

(ASTM 536 Gr 65-45-12)(ASTM A479 Type 316N)

< 30,000 (ASTM 126 Class B)EPDM/

BUNA-N Nylon 11 Coated

(ASTM 536 Gr 65-45-12)(ASTM A479 Type 316N)

< 40,000 (ASTM 126 Class B)EPDM/

BUNA-N(ASTM A351 CK3MCuN) (ASTM A479 Type 316N)

< 55,000 (ASTM 126 Class B)EPDM/

BUNA-N(ASTM A351 CK3MCuN) (ASTM A479 Type 316N)

< 100,000 (ASTM 126 Class B)EPDM/

BUNA-N(ASTM A494 CW2M) (ASTM A479 Type 316N)

Resilient Seated Butterfly Valves Material Selection for Seawater Systems

SWA

Nylon 11Nylon 11CoatingCoating

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Nylon 11 Coating Advantages

• Less Expensive Alternative to Nickel Aluminum Bronze and Duplex Stainless Steel

• Excellent Corrosion Resistance

• Excellent Impact and Abrasion Resistance

• Proven in Seawater Service No Corrosion After 20 Years Exposure

• Excellent in Salt Spray Environments No Corrosion After 2000 Hours Exposure

SWA

Nylon 11 Coating Advantages

• Thermoplastic Produced from Vegetable Base

• Low Coefficient of Friction Resulting in Lower Seating and Unseating Torques

• Not Subject to Ultraviolet Deterioration

• FDA / NSF-61 Approved for Sanitary Applications

SWA

Nylon 11 vs. Rubber Covered DiscsNylon 11 — Applied Uniformly and Continuously

Over the Entire Disc Surface.vs.

Rubber — (a) Lapped on Disc Surface and Edge, then Machined.

or(b) Bonded to Disc Substrate and Disc Edge is a Corrosion Resistant Metal.

Both Resulting in a Lack of Continuous Integrity of the Coating on the Disc and Exposure of Areas to Seawater Attack.

SWA

Nylon 11 vs. Rubber Covered Discs

• Nylon 11 Disc Edges have Lower Coefficient of Friction than Rubber Covered and Metal Disc Edges Resulting in Lower Seating and Unseating Torques.

• Nylon 11 Discs and Rubber Seats Form Better Seal at Higher Pressures than Rubber Discs and Seats.

SWA

Nylon 11 vs. Rubber Covered Discs

• Nylon 11 Discs do NOT Allow Barnacle Growth.Rubber Covered Discs Allow Barnacle Growth which Results in Cutting of the Seat Upon Opening and Closing.

• Nylon 11 is Thermoplastic and will NOT Age with Temperatures below 200 oF. Sulfur Cured EPDM will Age.

• Nylon 11 is Inert.

SWA

Bray Series 31 Valve with Nylon 11 Coated Ductile Iron (NDI) Disc5 years Seawater Exposure

AWWA C504 Compliant Valve with Rubber Coated Disc

19 month Seawater Exposure

Nylon 11 vs. Rubber Covered Disc

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Rubber Covered Valve & Disc(19 Month Seawater Service)

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Nylon 11 Application Process

• Final Dimensions Carefully Checked to Ensure Coating Thickness

• Disc is Subjected to Holiday Spark Test to Ensure Integrity of Coating

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Nylon 11 vs. Other Coatings

• Nylon 11 Coated Ductile Iron Samples Subjected to Salt Water Emersion for 18 Months

• Nylon 11 Showed No Deterioration or Corrosion

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Nylon 11 vs. Other Coatings(18 Month Salt Water Emersion)

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Nylon 11 Showed No Deterioration

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Nylon 11Physical / Chemical Properties

Melting Point 363 oF – 367 oF

Rockwell Hardness 106

Surface Hardness (68 oF / 10 sec) 11,600 PSI

Scratch Resistance 13.3 lbf

SWA

High PerformanceHigh PerformanceButterfly ValvesButterfly Valves

SWA

ANSI Class 150/300/600 High Performance Butterfly Valves

• API 607 4th Edition Certified

• 2 ½ ”- 60”

• Special Alloys

• Duplex and Austenitic Stainless Steels

• Hastelloy®

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ANSI Class 150/300/600 High Performance Butterfly Valves

• Bi-directional Design

• Blow-out Proof Stem

• Easy Automation

• Foolproof Installation

• Unique Pressure Assisted Seat Design

SWA

High Performance Butterfly Valves Material Selection for Seawater Systems

Chlorides(ppm)

Body & Disc Stem & Taper Pin

< 20,000 (ASTM A995 / A995M Gr.5A) (ASTM 479 / Type 316N)

< 30,000 (ASTM A995 / A995M Gr.5A) (ASTM 479 / Type 316N)

< 40,000 (ASTM A351-CK3MCuN) (ASTM A479 / AL-6XN)

< 55,000 (ASTM A351-CK3MCuN) (ASTM A479 / AL-6XN)

< 100,000 (ASTM A494-CW2M) (ASTM C276 / UNS N10276)

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One of Many Seawater Applications

• Chile’s Escondida Mine, the Largest Privately-

Owned Copper Mine in the World

• 60” Series 41 ANSI 150 High Performance Butterfly Valve

• 254 - SMO Duplex SS

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Selected Users of Bray Valves in Seawater

• Tampa Desalination Plant

• Fluor

• CFE Power

• Sea World

• Escondida Mine (Chile)

• Albwardy Marine (Dubai)

• Dubai Drydocks

• British Petroleum

• Israel Dead Sea Desalination Plant

• Corpus Christi Energy Center

• Newington Energy Project

• Mitsubishi

• Mhi Po

• Black & Veatch

• General Electric / Ionics

• Desalcot Trinidad

• Koch Membrane

• Degremont

• Siemens / US Filter / Power

• Veolia