SECTION 15810 DUST COLLECTION DUCTWORK AND ACCESSORIES

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 15810

DUST COLLECTION DUCTWORK AND ACCESSORIES


PART 1 GENERAL

1.1 SECTION INCLUDES:

A. Section Includes:  Ductwork materials, construction, hangers and supports, cleaning, and accessories.

1.2 REFERENCES

A. Codes and standards referred to in this Section are:
1. ASHRAE - ASHRAE Handbook - Fundamentals; Duct Design.
2. ASHRAE - ASHRAE Handbook - HVAC Systems and Equipment; Duct Construction.
3. ASTM A 36/A36M - Specification for Structural Work.
4. ASTM C 920 - Specification for Elastomeric Joint Sealants.
5. AWS D1.1 - Structural Welding Code – Steel.
6. AWS D9.1 - Sheet Metal Welding Code.
7. SMACNA - HVAC Duct Construction Standards.
8. SMACNA - Fire Damper Guide.
9. UL 181-Factory - Made Air Ducts and Connectors.

1.3 DEFINITIONS

A. Sealing Requirements Definitions: The following definitions apply for duct system sealing requirements:
1. Seams: Joining of two longitudinally in the direction of airflow oriented edges of duct surface material occurring between two joints. All other duct surface connections made on the duct perimeter are deemed to be joints.
2. Joints: Joints include girth joints; branch and subbranch intersections; so-called duct collar tap-ins; fitting subsections; louver and air terminal connections to ducts; access door and access panel frames and jambs; duct, plenum, and casing abutments to building structures.

1.4 SUBMITTALS

A. Shop Drawings:  Submit under provisions of Division 1, including the following:
1. Submit ¼ inch scale shop drawings indicating duct systems routing, sizes, fitting details, reinforcing, support, required clearances, and installed accessories and devices.

1.5 OPERATION AND MAINTENANCE DATA

A. Submit operation and maintenance data under provisions of Division 1.

B. Include manufacturer's descriptive literature, operating instructions, cleaning procedures, replacement parts list, and maintenance and repair data.

1.6 DELIVERY, STORAGE AND HANDLING

A. Deliver, store, and handle the equipment under the provisions of DIVISION 1.

1.7 QUALITY ASSURANCE

A. General: Provide materials from a company specializing in the design and manufacture of ductwork and duct fittings having a minimum of 5 years documented experience, which issues complete catalog data on these products.

B. Codes: Qualify welding processes and welding operators in accordance with AWS D1.1 for hangers and supports and AWS D9.1 Certify that each welder qualification is current.


PART 2 PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Nordfab Quick-Fit Ducting, Tomasville, NC.

B. Or Equal.

2.2 DUCTING

A. Material of Construction: 304 stainless steel finish meets ASTM A240.

B. Ducting Manufacturing Techniques:
1. Diameters 3? – 24? pipe, adjustable nipples, and collars attached to other components will have one or both ends die formed-rolled to provide a uniform edge around the circumference of the rolled end. The pipe and adjustable nipples shall have the longitudinal seam laser welded to allow for a tighter slip joint and reduce system pressure losses. All laser welded seams will undergo a light test to ensure there are no voids or imperfections in the system. Pipe lengths using laser welded seams will not exceed a nominal 60? length. The rolled edges provide structural support at 5? intervals or less and can be interpreted as a stiffener where SMACNA specifications are required. An adjustable nipple is used for adjustment during the install process. Pipe is cut to appropriate length and the adjustable nipple secures the pipe for install.
2. Pipe and other components larger than 24? shall utilize either an angle flange or flat flange attached loosely and retained in place using a 3/8? vanstone lip. The pipe shall have a compressed-interlocking lap form seam and not exceed 78? in length. The angle or flat flanges provide structural support at 6’-6” intervals or less and are considered as stiffeners where SMACNA specifi cations are required.
3. There will be times when certain components will be air direction sensitive. These components will have an arrow sticker attached showing the proper flow direction.

4. All ducting and its components shall have been tested to 80? WG using the following gauged reference
a. 3? will use 18ga material thickness
b. 4? through 12? will use 22ga material thickness
c. 13? through 29? will use 20ga material thickness
d. 30? and above will use 18ga material thickness

C. Clamping Rolled Edged Duct:
1. Clamps shall be constructed with an over-center, spring-lever action for quick connecting of two pieces of ducting. A retaining pin shall be inserted in the handle and an eyelet on the clamp as a safety feature to ensure the handle does not prematurely come undone.
2. When closing the clamp, the internal seal shall be compressed in such a manner as to cover both rolled beads for optimum sealing capacity in a full 360° pattern.

D. Sealant Materials:
1. Approved caulk is 3M Scotch Seal Metal Sealant 2084 or equivalent for system temperatures of 250°F or lower
2. Sealing Gaskets:
a. Buna-N, 70 Duro-Meter hardness with a temperature rating of 250°F maximum and is black in color, used with the adjustable nipple
b. Molded gaskets shall meet the material classification of ASTM D-2000 M2BG510 A24 B34 EO14 EO34 EF11 EF21 and used in systems where the temperature rating is 225°F or less and are black in color. This component shall be made using conductive materials for conductivity.
c. Sponge o-ring shall meet the material classification of either ASTM D- 1056-68 – SBE43 or ASTM D1056-85, 91, 98 – 2B3
3. Clamp seals:
a. Nitrile to meet or exceed ASTM D 1056 standards with a temperature rating not to exceed 158°F constant temperature (or intermittent temperature of 194°F).

E. Conductivity:
1. Metal-to-metal contact shall be obtained at all joint connections. Die-formed rolled edges are uniform in shape which provides the most consistent contact. The ears of the clamp contact with the rolled edges and provide maximum conductivity. Conductivity shall be adhered to per NFPA77 paragraph 8.4.1.1; states all parts of the continuous metal piping system should have a resistance level that does not exceed 10 ohms.

2.3 ACCESSORIES

A. Explosion Isolation Flap:
1. Provide explosion isolation for installation upstream of the dust collector.
2. Comply with NFPA standards that require a dust collection system has a means of preventing the transmission of energy form a fire or explosion to the building/work area.

B. Automatic Blast Gates (FV-12-6-2, FV-12-9-2, FV-12-12-2):

1. Automatic energy saving blast gates operated by double-acting compressed air cylinders. Cylinders are controlled by electrically connecting solenoid to machines or remote switch. Gates are constructed with a special sealing device that reduces air loss and friction in operation.
2. Power and Air Requirmenmts: 120 Volt power source and 80 psi minimum air pressure horizontally mounted.
3. Material Specifications:
a. Body: 304stainless steel finish meets ASTM A240.
b. Seal: Ultra High Molecular Weight (UHMW).
c. Gasket Spring: Poron® Cellular Urethane material.
4. Cylinders:
a. Crimped round body, 304 Stainless Steeltube only, Aluminum end caps, Non-repairable.
b. Bore size is 1-1/16".
c. Ports are 1/8" NPT Standard.
d. Piston rod diameter is 0.312".
e. Piston rod material: 304 Stainless steel only.
f. Single acting end.
g. Standard fluid: Filtered air.
h. Operating medium: Pneumatic, 250 PSI maximum (normal operating pressure is (80 psi minimum).
5. Poly tube: ¼" 0D x 0.040 wall poly tube, 120 psi, Grade E5 LIP, Type 1.
6. Solenoid:
a. 0.8Cv flow characteristics.
b. 1/8" NPT ports.
c. Solenoid is constant pressure.

2.4 HANGERS AND SUPPORTS

A. Building Attachments: Structural-steel fasteners appropriate for construction materials to which hangers are being attached.

B. Hanger Materials:  Stainless steel.
1. Strap and Rod Sizes:  Comply with SMACNA's "HVAC Duct Construction Standards--Metal and Flexible" for steel sheet width and thickness and for steel rod diameters.

C. Duct Attachments:  As recommended by the Manufacturer. Do not use sheet metal screws, blind rivets, or self-tapping metal screws.

D. Trapeze and Riser Supports:  Steel shapes complying with ASTM A 36/A 36M.
1. Supports for Stainless-Steel Ducts:  Stainless-steel support materials.


PART 3 EXECUTION

3.1 INSTALLATION

A. Install in accordance with the Drawings, shop drawings, and manufacturer's instruction.

B. Joints:  Install ducts with the fewest possible joints.

C. Fittings:  Use fabricated fittings for all changes in directions, changes in size and shape, and connections.

D. Flexible Duct:  Provide flexible duct connectors where shown.

E. Hanging and Supporting: Support ductwork as follows:
1. Make provisions for supporting all ductwork, dampers, and other ductwork accessories, where necessary.
2. Construct, reinforce, support and brace ductwork to prevent buckling, warping, sagging, flexing and vibrating and be quiet in operation under all operating conditions and airtight at the fan static pressures scheduled.
3. Securely support horizontal ducts from the building structure by means of hanger rods or angle supports as recommended in the current editions of the ASHRAE Handbook and of the SMACNA HVAC Duct Construction Standards. Size hanger rods for the weight carried, thread at both ends, and equip with nuts and washers.
4. Support horizontal ducts within 2 feet of each elbow and within 4 feet of each branch intersection.
5. Support vertical ducts as recommended in the current editions of the ASHRAE Handbook and of the SMACNA HVAC Duct Construction Standards.

3.2 CONDUCTIVITY TESTING:

A. Test ducting to ensure that conductivity adheres to NFPA77 paragraph 8.4.1.1; that states all parts of the continuous metal piping system should have a resistance level that does not exceed 10 ohms.

3.3 FIELD QUALITY CONTROL

A. Manufacturer's Field Services:  Furnish the services of a qualified representative of the manufacturer to provide instruction on proper installation of the equipment, inspect the completed installation, make any necessary adjustments, participate in the startup of the equipment, participate in the field testing of the equipment and place the equipment in trouble-free operation, as specified in Division 1.

3.4 CLEANING

A. General: Perform cleaning Work in accordance with the following:
1. Keep each duct system internally clean by installing only clean materials and by providing temporary closures during the installation.
2. Remove all loose materials and obstructions from interior of ducts.
3. Clean duct system and force air at high velocity through duct to remove accumulated dust. To obtain sufficient air, clean half the system at a time. Protect equipment which may be harmed by excessive dirt with temporary filters, or bypass during cleaning.


END OF SECTION