35 20 16.25 Fabricated Slide Gates.pdf

KUB KWWTP Primary Clarifier Influent Upgrades

FABRICATED SLIDE GATES

REVISED 12/05/24 35 20 16.25 - 1

SECTION 35 20 16.25

FABRICATED SLIDE GATES

1 PART 1 - GENERAL

1.01 SUMMARY

A. Section Includes: Materials, products and performance requirements for stainless steel fabricated slide gates.

1.02 REFERENCES

A. The following is a list of standards which may be referenced in this section:

1. American Water Works Association (AWWA): C561, Fabricated Stainless Steel Slide Gates.

2. ASTM International (ASTM):

a. A193/A193M, Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High

Pressure Service and Other Special Purpose Applications.

b. A240/A240M, Standard Specification for Chromium and Chromium-Nickel Stainless Steel

Plate, Sheet, and Strip for Pressure Vessels and General Applications.

c. A276, Standard Specification for Stainless Steel Bars and Shapes.

d. A380, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems.

3. National Electrical Manufacturers Association (NEMA): 250, Enclosures for Electrical Equipment

(1,000 Volts Maximum).

1.03 DEFINITIONS

A. Self-Contained: The arrangement of gate operator, supported by gate frame, such that operating thrust loads are not applied external to the assembly.

B. Non-Self-Contained: The Arrangement of the gate operator such that operating thrust loads are applied external to the assembly.

1.04 SUBMITTALS

A. Action Submittals:

1. Shop Drawings:

a. Make, model, weight, and horsepower of each equipment assembly.

b. Manufacturer’s catalog information, descriptive literature, and specifications.

c. Complete description of all materials including the material thickness of all structural components of the frame and slide

d. General assembly drawings showing all details of construction, details required for installation, dimensions, and anchor bolt locations. Include dimensions, size, and locations of connections to other work, and weights of associated equipment associated therewith. General assembly drawings must be provided in 3D format.

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e. Maximum bending stress and deflection of the slide under the maximum design head.

Calculations for maximum operating load, hoist selection, and stem design.

B. Information Submittals

1. Manufacturer’s Certificate of Compliance

2. Special shipping, storage and protection, and handling instructions.

3. Manufacturer’s written/printed installation instructions.

4. Routine maintenance requirements prior to plant startup.

5. Operation and Maintenance Data

6. Manufacturer’s Certificate of Proper Installation

7. Service records for maintenance performed during construction.

1.05 EXTRA MATERIALS

A. Furnish, tag, and box for shipment and storage the following spare parts and special tools:

1. Stem collars for all gate stems (One of each different size)

2. Bronze lift nuts (One of each different size)

3. Special tools required to maintain or dismantle (One complete set)

2 PART 2 – PRODUCTS

2.01 MATERIALS

A. Stainless Steel:

1. Frame Assembly and Retainers: Stainless Steel, ASTM A240 Type 316L

2. Slide and Stiffeners: Stainless Steel, or ASTM A240 Type 316L

3. Stem: Stainless Steel, ASTM A240 Type 316L

4. Fasteners, Nuts and Bolts: Stainless Steel, ASTM A276 Type 304 ASTM F593 and F594GR1 for type 304 and GR2 for type 316

5. Seat/Seals and Facing: Ultra-High Molecular Weight Polyethylene ASTM D4020

6. Lift Nuts: Bronze ASTM B584

7. Pedestals and Wall Brackets: Stainless Steel, ASTM A240 Type or 316L

8. Operator Housing: Cast Aluminum or Ductile Iron

2.02 PERFORMANCE REQUIREMENTS

A. The slide gates will be designed for water tightness for both seating and un-seating differential head per the actual site requirement as detailed in the Slide Gate Schedule.

B. The slide gates will be shop tested to verify the leakage performance at operating head in the un-seating direction. Where sealing configuration permits, hydrostatic testing will be conducted at 1.5 times operating head, to demonstrate structural integrity. Testing for opening load at the unseating operating head to verify actuating mechanism sizing will also be conducted.

C. Leakage shall not exceed 0.05 gallon per minute per foot of gate periphery under either maximum seating or maximum unseating head conditions.

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2.03 SLIDE GATES

A. General:

1. Unless otherwise specified, conform to AWWA C651.

2. The slide gate will be supplied complete with all accessories such as: gate assembly, gasket, studs and nuts for mounting, stem, thrust nut, stem couplings, stem guides, pedestal, operating mechanism as required, gate opening indicating arrangement and as required anchor bolts and fasteners for stem guides and pedestal.

3. All structural components of the frame and slide shall be fabricated of stainless steel having a minimum thickness of 1/4-inch and shall have adequate strength to prevent distortion during normal handling, during installation and while in service.

4. All welds shall be performed by welders with AWS certification for the material grades used in fabrication.

5. All welds shall be full and continuous performed by welders with AWS certification for the material grades used in fabrication.

B. Qualifications:

1. All of the equipment specified under this Section shall be furnished by a single manufacturer with a minimum of 20 years experience designing and manufacturing water control gates. The manufacturer shall have manufactured water control gates for a minimum of 100 projects.

2. The manufacturer’s shop welds, welding procedures, and welders shall be qualified and certified in accordance with the requirement of the latest edition of ASME, Section IX or AWS D1.6 Structural

Welding Stainless Steel.

C. Rising stem type, with the following assembly style:

1. Upward acting type for wall surface mounting on the concrete structures.

D. Seals:

1. The frames shall be equipped with seats/seals to prevent metal-to-metal contact and restrict leakage.

The guides of all gates shall incorporate ultra-high molecular weight (UHMW) polyethylene seat/seals on both the upstream and downstream sides of the slide. Each seat/seal will be shaped to act as both a bearing surface and a seal. The top seal, where required on upward opening gates, shall be mounted on the frame and be of low friction polymer construction.

2. All upward opening gates shall contain a replaceable, flush bottom neoprene invert seal, mounted on the slide, or in the frame.

3. All seals must be bolted or otherwise mechanically fastened to the frame or slide.

4. The seal system shall have been factory tested to confirm negligible wear (less than 0.01”) and proper sealing. The factory testing shall consist of an accelerated wear test comprised of a minimum of 100,000 open-close cycles using a well- agitated sand/water mixture to simulate fluidized grit.

5. “J-bulb”, “P-seals”, “d-seals”, or similar rubber seals are not acceptable.

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E. Guide Frames:

1. Stainless steel of one-piece design, with gussets provided to accommodate unseating head. Sandwich type and two-piece guide designs are not acceptable. Portion of wall-mounted frame, where anchors penetrate, shall have a minimum thickness of 1/4-inch.

2. Frame side rails/guides shall be of the channel section design, sized to receive a corresponding channel section of the gate disc.

3. Vertical Guides: Design for maximum rigidity and extend in one continuous piece from the gate invert to form posts for support of gate operators of self-contained gates. When guides extend above the operating floor, they shall be sufficiently strong so that no further reinforcements are required.

a. Weight: Not less than 13 pounds per linear foot for wall-mounted frames, and not less than 6.5 pounds per linear foot for channel-mounted guides.

b. Incorporate a replaceable, self-adjusting, UV-stabilized UHMW polyethylene bearing strip with nitrile compression cord in a retainer slot on the downstream side (unseating head side) of the gate. Seal shall be mechanically fastened in the guide slot on both the upstream and downstream sides of the disc. No wedges, pressure pads or similar wedging devices are allowed.

4. Frame Invert: For flush bottom gate, furnish an EPDM insert to function as a seating surface for the gate disc.

a. Weight: Not less than 13 pounds per linear foot for wall-mounted frames, and not less than 6.5 pounds per linear foot for channel-mounted inverts.

5. Join vertical guide frames and invert with factory welded corners.

6. Size guided slot to provide a minimum disc engagement of 1 inch on each side.

7. Replaceable UHMW guide shall be mechanically fastened to disc or, if guide is placed in frame, stainless steel spacers and retainer tabs shall be welded to frame to prevent any lateral movement of guide either parallel or perpendicular to disc.

F. Disc:

1. Disc Plate (Sliding Member): One-piece stainless steel plate. Reinforce as required so that the disc will not deflect more than 1/360 of the gate span, or 1/16 inch, whichever is less, when the upstream liquid depth (seating head side) is as shown on the schedule and the downstream liquid depth is less than 1/2 inch.

2. Reinforcing stiffeners shall be continuously welded (stitch welding will not be acceptable) to the slide and mounted horizontally. Vertical stiffeners shall be continuously welded on the outside of the horizontal stiffeners for additional reinforcement.

3. The stem connector shall be constructed of two angles or plates. The stem connector shall be continuously welded to the slide. A minimum of two bolts shall connect the stem to the stem connector.

G. Stems:

1. Rising type operating stems, 1-1/2 inch minimum diameter

2. Threads: Acme type with RMS surface roughness of 16 microinches or less on the flanks. Stub threads are not acceptable. Extend threaded portion of stem 2 inches above operator when gate is in

CLOSED position.

3. Couplings:

a. Use when stems have more than one section.

b. Manufacturer's standard stainless steel or bronze coupling.

c. Furnish with internal threads that transmit full thrust of stem.

d. Hold in place on stem with bolts or keys and keyways.

REVISED 12/05/24 35 20 16.25 - 5

e. Same size and interchangeable.

4. Slenderness (L/r) ratio shall not exceed 200.

5. Stems to withstand in compression, without damage, the thrust equal to at least 1-1/2 times the rated output of the hoisting mechanism, with a 100 pound effort applied to the handwheel or crank.

6. Adjustable stop collar for the CLOSED position.

7. The stem shall be constructed of solid stainless-steel bar for the entire length, the metal having a tensile strength of not less than 90,000 psi for stems that are 3 inches or less in diameter. Stems that are in excess of 3 inches in diameter shall have a tensile strength of 85,000 psi.

H. Stem Covers:

1. Operators shall be equipped with polycarbonate plastic stem covers.

2. The top of the stem cover shall be closed and vented. Gate opening indication will be provided on the stem cover for all non-rising stem gates. A full height scale will be mounted on the side of the stem cover and an indicator nut mounted on the rising stem to show gate position. The scale graduation will be 1”.

3. The bottom end of the stem cover shall be mounted in a housing or adapter for easy field mounting.

4. Stem covers shall be complete with indicator markings to indicate gate position.

5. The floor box shall be constructed of stainless steel or cast iron and shall be set in the concrete floor above the gate as shown.

6. Provide one aluminum or stainless-steel T-handle wrench for operation.

I. Anchor Bolts:

1. Anchor bolts shall have a minimum diameter of 1/2-inch.

2. Anchor bolts shall be provided by the gate manufacturer for mounting the gates and appurtenances.

3. Quantity and location shall be determined by the gate manufacturer.

4. If epoxy type anchor bolts are provided, the gate manufacturer shall provide the studs and nuts.

5. For attachment to existing concrete structures, the anchors shall be adhesive anchor system utilizing an injection adhesive manufactured for the installation of post-installed reinforcing steel dowels and anchors. Epoxy anchors shall be Hilti HY-200 or approved equal.

J. Manufacturers:

a. Rodney Hunt Inc.

b. Or approved substitute.

K. Slide Gate Schedule:

Slide Gate Schedule

Gate

Location

Wall Opening

(width/height inches)

Gate

Height

(inches)

Design Operating Head (feet)

Seating/Unseating Condition

Operator Type/

Control Style

Quantity

Primary

Clarifiers

Width: 60”

Height: 45”

45” 2.2 ft MOTOR

(OPEN/CLOSE)

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2.04 GATE OPERATORS

A. Gates shall be capable of being operated by an electrical actuator (not included in this specification).

B. Gate operators shall be electrical actuators as provided by Owner.

3 PART 3 - EXECUTION

3.01 INSTALLATION

A. Slide gates and actuators shall be installed by Contractor according to the following:

1. In accordance with the manufacturer’s written instructions.

2. Disassemble factory assembled gate components before installation.

3. The gate assemblies shall be installed in a true vertical plane, square and plumb.

4. Field mount operators after installing gates.

5. Brace thimbles internally during concrete placement.

6. Accurately place anchor bolts using templates furnished by the manufacturer

7. Lubricate stems before operating.

3.02 FIELD QUALITY CONTROL

A. Functional Tests: Conduct on each slide gate.

B. Performance Test:

1. Conduct on each slide gate.

2. Perform under actual or approved simulated operating conditions.

3. Test for a continuous 3-hour period without malfunction.

4. Adjust, realign, or modify units and retest if necessary.

3.03 MANUFACTURER’S SERVICES

A. Manufacturer’s Representative: Present at Site or classroom designated by Owner, for minimum person-days listed below, travel time excluded:

1. 0.5 person-days for functional and performance testing and completion of Manufacturer’s Certificate of Proper Installation.

2. 0.5 person-days for post-startup training of Owner’s personnel.

B. Provide manufacturer’s representative at Site for installation assistance, inspection and certification of proper installation, equipment testing, startup assistance, and training of Owner’s personnel for specified component, subsystem, equipment, or system.

C. Actuators shall be started up only by authorized actuator manufacture representative. All synchronous motors shall be tested with jobsite power to measure and document proper operational parameters for warranty qualification. Proof of test and affidavit of testing shall be required for final release of payment.

END OF SECTION