SECTION SLUICE GATES

Transcription

1 SECTION SLUICE GATES PART 1--GENERAL Fill in the blank with a short description of sluice gate usage, i.e., for isolation of wastewater, or for tank drainage, or for control of water surface DESCRIPTION A. SCOPE: This section specifies sluice gates of cast iron construction for. The Contractor shall assign unit responsibility as specified in paragraph C to the sluice gate manufacturer for the combined equipment consisting of sluice gate and operator. Type A sluice gate is the standard model that meets the AWWA C501 specification. This gate is used when leakage is not critical. AWWA C501 permits a maximum leakage rate of 0.1 gpm per foot of seating perimeter with a seating head. Type B sluice gate is a PROPRIETARY gate manufactured only by Rodney Hunt, and it is distinguished by having resilient seals around the entire opening. This gate is used when leakage is critical. Manufacturer claims leakage is 1 percent of AWWA requirements. Type B gates cannot be used for seating or unseating heads greater than 25 feet. B. TYPE: Sluice gate types specified are: 1. TYPE A: Sluice gates shall be of cast iron construction with full metal wedges, flat frames, and wall thimbles. 2. TYPE B: Sluice gates shall be of cast iron construction with sliding resilient seals, flat frames, and wall thimbles. Flush bottom gates are used where solids are present in the liquid stream. They reduce the collection of solids by the gate. Develop the table to match the project design operating requirements. 4/22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common [Contract Name]

2 C. OPERATING REQUIREMENTS: Equipment No. Size, inch Gate type Opening a direction Bottom a seating Frame a Design head, feet type Seating Unseating Operator type a Abbreviations: U = upward opening; D = downward opening; FB = flush bottom; S = standard; SC = self-contained (yoke type); C = conventional D. COMPONENT SIZING: Operating forces used for determining the strength of gate components comprising of yokes, frames, discs, stems, disc nut pockets, and other load-bearing members shall be based on the sum of the guide friction force (computed using an opening breakway friction factor of 0.70) and the weight of disc and stem. When the gate is in motion, the operating forces shall be based on the sum of the frictional force (using a guide friction factor of 0.35) and the weight of disc and stem REFERENCES This section contains references to the following documents. They are a part of this section as specified and modified. Where a referenced document contains references to other standards, those documents are included as references under this section as if referenced directly. In the event of conflict between the requirements of this section and those of the listed documents, the requirements of this section shall prevail. Unless otherwise specified, references to documents shall mean the documents in effect at the time of Advertisement for Bids or Invitation to Bid (or on the effective date of the Agreement if there were no Bids). If referenced documents have been discontinued by the issuing organization, references to those documents shall mean the replacement documents issued or otherwise identified by that organization or, if there are no replacement documents, the last version of the document before it was discontinued. Where document dates are given in the following listing, references to those documents shall mean the specific document version associated with that date, regardless of whether the document has been superseded by a version with a later date, discontinued or replaced. Reference ASTM A126 ASTM A276 ASTM B98 ASTM B103 [Contract Name] Title Gray Iron Casting for Valves, Flanges and Pipe Fittings Stainless and Heat-Resisting Steel Bars and Shapes Copper-Silicon Alloy Rod, Bar and Shapes Phosphor Bronze Plate, Sheet, Strip and Roller Bar /22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common

3 Reference ASTM B139 ASTM B584 ASTM F593 ASTM F594 AWWA C501 Title Phosphor Bronze Rod, Bar and Shapes Copper Alloy Sand Castings for General Applications Stainless Steel Bolts, Hex Cap Screws, and Studs Stainless Steel Nuts Cast Iron Sluice Gates 1.03 SUBMITTALS The following information shall be provided in accordance with Section 01300: 1. A copy of this specification section, with addendum updates included, and all referenced and applicable sections, with addendum updates included, with each paragraph check-marked to indicate specification compliance or marked to indicate requested deviations from specification requirements. Check marks ( ) shall denote full compliance with a paragraph as a whole. If deviations from the specifications are indicated, and therefore requested by the Contractor, each deviation shall be underlined and denoted by a number in the margin to the right of the identified paragraph, referenced to a detailed written explanation of the reasons for requesting the deviation. The Construction Manager shall be the final authority for determining acceptability of requested deviations. The remaining portions of the paragraph not underlined will signify compliance on the part of the Contractor with the specifications. Failure to include a copy of the markedup specification sections, along with justification(s) for any requested deviations to the specification requirements, with the submittal shall be sufficient cause for rejection of the entire submittal with no further consideration. 2. Certificate of Unit Responsibility attesting that the Contractor has assigned, and that the manufacturer accepts, unit responsibility in accordance with the requirements of this Section and paragraph C. No other submittal material will be reviewed until the certificate has been received and found to be in conformance with these requirements. 3. Plan, cross section, and details showing proposed mounting for each size and typical application of gate. PART 2--PRODUCTS If Type B sluice gates are specified, add the following: "Type B sluice gates shall be Glidaseal sluice gates as manufactured by Rodney Hunt, modified to meet specified requirements. The Owner knows of no equal." 4/22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common [Contract Name]

4 2.01 ACCEPTABLE PRODUCTS Type A cast iron sluice gates shall be Rodney Hunt, Waterman, or equal, modified to meet specified requirements EQUIPMENT A. SLUICE GATES: Sluice gates shall meet the requirements of AWWA C501 except as otherwise specified. Sluice gates shall be of the heavy-duty type. Frames shall be flat back. Sluice gates shall be provided, unless otherwise specified, with one-piece F-section cast iron wall thimbles. The vertical centerline shall be shown by permanent marks at the top and bottom of the machined face with the word "top" marked near the top center of the thimble opening. Stems and stem guides shall be provided in accordance with AWWA C501, Sections 3.11 and Unless otherwise specified, gates shall have single rising stems. Stems shall have 29- degree acme threads and be turned straight and true and honed to a smooth 63 micro-inch or better finish. Stem couplings, where required, shall be of the stem material. Stem guides shall be of the split, bronze bushed, adjustable type. B. TYPE A SLUICE GATE MATERIALS: Component Gate, guide and frame Seating faces Wall thimbles Material ASTM A126, Class B, cast iron ASTM B103 or B139, bronze ASTM A126, Class B, cast iron Stems ASTM A276, stainless steel, Type 304 Wedges, thrust nut, stem couplings Fasteners and adjusting hardware Yoke Flush bottom seal Flush bottom retainer ASTM B584, bronze, CA872 ASTM A276, stainless steel, Type 304, or ASTM F593 and F594, stainless steel, group 1 or group 2 ASTM A126, Class B, cast iron Neoprene ASTM A276, stainless steel, Type 304 bar C. TYPE B SLUICE GATE: 1. MATERIALS: Same as for Type A, except as follows: [Contract Name] /22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common

5 Component Guide bar Gate disc seal Frame seat Material ASTM B98A, CA655, bronze Neoprene PVC 2. SEATING: The seating surface shall be PVC strips, permanently attached to the iron frame. The seating face on the disc shall be a special shaped neoprene seal, bonded into a groove in the cast iron. The sealing pressure between the neoprene seal and the PVC strip shall be increased or decreased by means of an adjustable bronze guide bar attached to the cast iron frame. Adjustment shall be by means of adjusting screws with locking nuts to secure the bronze bar in place once it has been set. Sealing surfaces shall be at an angle to the vertical to create wedging action under full closure OPERATORS A. GENERAL: Operators specified include hand-crank, handwheel, and T-wrench. Operators shall meet AWWA C501 specifications, except as otherwise specified, and shall be designed to meet the operating requirements specified in paragraph C. Plastic stem covers shall be provided as specified in AWWA C501, Section On both crank and handwheel manual operators, gears and bearings shall be enclosed in a weatherproof cast iron housing, and pressure type fittings shall be provided for grease lubrication of the bearings and gears. A maximum effort of 40 pounds pull on the crank or handwheel shall operate the gate under the specified operating conditions. B. TYPE I: Operator shall be the manual, geared, crank type. The operator shall be either pedestal or bench mounted as specified. Pedestal type floor stands shall be the offset type or the standard type with wall mounting bracket. The crank shall be 15 inches long. The geared floor or bench stand shall have a weatherproof, cast iron housing, with a bronze operating nut, mounted on a high- strength cast iron pedestal baseplate. The operating nut shall be internally threaded with 29-degree acme threads corresponding to stem threading. Tapered roller bearings or ball bearings shall be located above and below the bronze operating nut to support the output thrust of the floor stand. The pinion shaft shall be mounted on tapered roller or needle bearings to resist axial and radial thrusts. Mechanical seals shall be provided around the operating nut and the pinion shaft to prevent lubrication from leaving the unit and moisture from entering the sealed housing. The reduction gear case shall be precision machined and equipped with tapered roller or needle bearings and sealed about the reduction shafts. Operators shall be self-locking at any position of stem travel. The input shaft shall be fitted with an AWWA nut. 4/22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common [Contract Name]

6 C. TYPE II: Operator shall be the manual handwheel type. The operator shall be either pedestal or bench mounted as specified. Pedestal type floor standards shall be the offset type or the standard type with wall mounting bracket. Pedestal or bench stands shall be cast iron. The head of the pedestal or bench stand operator shall have a solid bronze internally threaded operating nut. The operator shall be mounted on antifriction roller bearings. Handwheels shall be removable from the operator. Special floor box type operators are not a standard item with the manufacturer and are fabricated when specified. Because of the limited space in the box for the gate stem to rise, these are only specified for smaller gates. Consider specifying a limited number of T-wrenches since often one wrench can be used to operate different gates in the same area. D. TYPE III: Operator shall be the T-wrench type, including floor box, thrust bearings, and lift nut. Floor box shall be of fabricated steel, with galvanized steel hinged cover and embedded in the floor or mounted on a wall bracket as specified on the drawings. Floor box depth shall be such that the gate stem and operating nut does not protrude above the floor under any condition. Wall brackets shall be cast iron or fabricated steel. Thrust bearings shall be roller or ball bearing type, replaceable and protected by seals. Accessible pressure type grease fittings shall be provided for bearing lubrication. Operating nuts shall be AWWA standard 2-inch square head nuts. T- wrenches shall be 4 feet long, aluminum, with socket to match the operating nut. E. PORTABLE ELECTRIC MOTOR OPERATOR: A portable powered operator can be provided as an accessory to crank-operated units. F. POWER OPERATORS: If power operators are required, then Section needs to be provided within the project manual. Because of the complexity of the mechanical sealing system used on sluice gates, we require the sluice gates to be coated in the factory (shop). Any nicks, scratches, or defects in the factory applied coating system are to be repaired in the field COATING SYSTEM Sluice gates shall be shop coated with coating system EP as specified in Section PRODUCT DATA The following information shall be provided in accordance with Section 01300: 1. Product information, calculations, charts, or graphs to verify that the product provided meets the requirements set forth in this specification. [Contract Name] /22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common

7 2. Affidavits of compliance in accordance with AWWA C Applicable operation and maintenance information as specified in Section PART 3--EXECUTION 3.01 INSTALLATION Unless otherwise specified, sluice gates shall be installed in accordance with manufacturer's instructions TESTING Shop seat clearance and operating tests shall be performed as per Section 4.2 of the AWWA Specification C501, and field operating and leakage tests shall be conducted as specified in Section 6.3 of the AWWA Specification C501. **END OF SECTION** 4/22/2004 1:00 PM p:\21058\200\207\final Draft\Specs\Common [Contract Name]