S06 23 42 00 Dust Collector.pdf

VA 813-028 Indiantown Gap National Cemetery

AEW Project No. CFM0-004 Phase 5 Development

Addendum 1

DUST COLLECTOR

23 42 00 - 1

SECTION 23 42 00

PART 1 - GENERAL

1.2 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including

General and Supplementary Conditions and Division 1 Specification

Sections, apply to this Section.

1.3 SECTION INCLUDES

A. Dust collector.

B. Collector system ductwork.

C. Intake nozzles for equipment and floor sweeps.

1.4 QUALITY ASSURANCE

A. Select filter media that is UL listed, Class II.

1.5 SUBMITTALS

A. Shop Drawings, Product Data, Samples: Submit under provisions of division 1.

B. Submit shop drawings of factory fabricated assemblies.

C. Manufacturer's installation instructions.

1.6 REFERENCE STANDARDS

A. National Fire Protection Association (NFPA):

1. NFPA 90 AND NFPA 90B

2. NFPA 64 and 664

2 - PRODUCTS

2.2 ACCEPTABLE MANUFACTURERS

A. Stern Vent Company, Union, NJ. Bill

B. Approved equal by engineer.

2.3 COLLECTOR SYSTEM DUCTWORK

A. Furnish and install a system of dust collection and removal, consisting of all ductwork, floor sweeps, connections, fittings, equipment hoods, collector, shown on the drawings and required for a complete operating system. System shall be designed and sized as a high velocity installation with air leakage not to

23 42 00 - 2 exceed ½ of 1%.

B. Ductwork shall be installed as high as possible and shall be coordinated with the location of lighting fixtures, Buss Duct, other ductwork, heating equipment, piping and shop equipment.

Ductwork shall be constructed of galvanized sheet steel and shall be rigidly supported.

Diameter of Straight Duct U.S. Gauge for Steel Duct to 12" 22

13" to 18" 20

18" to 30" 18 over 30" 16

C. Elbows and fittings shall be a minimum of two gauges heavier than straight length of equal diameter.

D. Duct shall be furnished in spiral locking seam construction.

Fittings shall be all welded construction.

E. Ductwork seams shall be installed with leading edge facing direction of air flow to prevent dust particles from collecting and clogging at the seams.

F. Elbows should have an inside or throat radius of two pipe diameters whenever possible, but radius shall never be less than

1 1/2 the pipe diameter. Construction of elbows 8” diameter or less shall be die formed, over 8” diameter of five sections, welded.

G. Metal intake connections shall be free of sharp edges or burrs and reinforced to provide necessary stiffness. Connections shall be furnished, constructed and installed by this Contractor, and shall be shaped, attached and located to most efficiently pick-up dust and debris from each machine hood and item of equipment shown on the drawings.

H. Provide dead end caps within 6” from last branch of all main or submains. Provide cleanouts every 10’ and near each elbow, or duct junction in horizontal sections.

I. Transitions in mains and submains shall be tapered. Taper 5” long for each 1” change in diameter.

J. Blast gates shall be installed for adjustment of system near connection of each piece of equipment or connection. Provide means of locking gates after adjustments have been made.

K. Provide PVC flexible ducts with transitions to connect to equipment duct collector nozzles. Where nozzles are omitted, the contractor shall construct sheet metal ductwork to form over the equipment to collect the dust.

23 42 00 - 3

2.4 PREMANUFACTURED DUST COLLECTOR DUCTWORK

A. Contractors may use this product in lieu of the shop fabricated ductwork in item 2.3.

B. Product Description: The system is a full line of duct and components. All parts are of standard sheet metal construction with a rolled lip applied to the each end of the component. An all stainless over-center locking clamp is used to encompass the rolled lips, pull them together and then securely join them.

Adapters enable connection to virtually any machine or existing duct.

C. Clamp: The lifetime guaranteed clamp is fitted with a ‘winged-

O-ring’ gasket made of N-butyl rubber. The gasket is designed to fully encompass the entirety of the rolled lips including the area formed by the ‘v’ between the rolled lips. Other gasket material is available. *

D. Duct and Adjustability: The duct is a nominal 5’ length.

Adjustable sleeves and adjustable components enable the installer to quickly make odd lengths and to adjust for a proper fit. To utilize this feature, a cut piece of pipe is slid into the sleeve or fitting and secured with an O-ring and standard clamp.

E. Materials: Material Duct and Components are to be galvanized duct.

F. Gauges:

1. Duct Standard Gauges for the duct are 26 ga for 3”, 24 ga for 4-6”, 22 ga for 7-12” and 20 ga for sizes 13-22”.

2. Elbows are typically one gauge heavier than standard duct gauge.

3. All components (branches, reducers etc) are of 18 ga material.

G. Gasket Material:

1. Viton, Gore-Tex, Red Silicone Rubber, Asbestos gaskets and

O-ring material are also available.

H. Pressure Rating.

1. The rolled lip on the duct and fittings act as a stiffing ring and therefore allow the product to withstand much higher pressures than normally associated with spiral or other rolled duct. The duct is typically installed with confidence in pressure applications up to 40” negative water column pressure. Higher pressures guarantees are available.

I. Provide PVC flexible ducts with transitions to connect to equipment duct collector nozzles. Where nozzles are omitted, the contractor shall construct sheet metal ductwork to form over the equipment to collect the dust.

23 42 00 - 4

2.5 DUST COLLECTOR

A. Outdoor wood dust collector with automatic filter shaker. Unit shall be Sternvent Vibraclean Model DKPD 36005-2 or approved equal.

B. Furnish and install, where shown on the plans, a high efficiency filter type dust collector with integral blower sized for design air flow of 2185 CFM @ 7.8" WG Ext. SP.

C. Dust collector shall be self-cleaning fabric type complete with cotton filters, backward inclined blower, motorized shaker, support stand, controller and external discharge silencer.

Manufacturer’s literature shall state that dust collector and selected filter spacing is designed for the collection of wood dust.

Dust collector shall be airtight, all steel construction with sealed seams and gasketed quick opening doors with 1/4 turn knobs. Housing shall be a minimum of 14-ga. mild steel. Unit shall consist of a filter section, with sloped roof to shed rain and a funnel bottom section without slide gates or doors to allow downflow of dust directly into (2) 55-gallon drum assemblies furnished by manufacturer. Inlet, with baffle, shall be centered on rear for even distribution of dust to the drums. Designs with inlet on narrow side shall not be accepted. Include an explosion relief vent, in the dirty section of the filter housing, per NFPA

#664.

D. Unit to include a multi-pocket filter modules, which is sewn from

8-ounce cotton sateen fabric designed to deliver in excess of

99.5% efficiency by weight on industrial dusts. The filter module shall have rigid insert separators to prevent collapse of filters and loss of the effective filter area. Flat shaker fingers located at the bottom of the filter module shall prevent adjoining pockets from touching one another and blanking off.

The filter pocket spacing shall be of the wide spacing type (1-

1/2") to permit the collected dust to be shaken off the filters freely and recommended by the manufacturer for the collection of wood dust. Fabric media with narrow spacing, open bottom pockets with dust collected inside the pockets or pleated cartridges will not be accepted. Total airflow to filter fabric area (air to cloth ratio) shall not exceed 7 CFM per square foot.

E. Each filter module shall be secured in place by two lever, operated over-center, locking mechanisms to assure a positive seal and allow for easy removal of filters from outside of unit, without tools. Designs which require entry into unit (confined space), for filter maintenance, are not acceptable.

F. Filters will be cleaned automatically after a fifteen second delay following the shutdown of the blower, by the oscillating action delivered by the motorized eccentric driven shaker assembly, which imparts a vibratory force throughout the entire surface of each individual filter pocket to dislodge the dust.

23 42 00 - 5

Shaker motor shall be 1/3 HP. Operation of the automatic shaker shall be controlled by a solid state, dual mode timer with adjustable shaker cycle range from 1.8 - 180 seconds. Magnetic starters with overload relays for the blower and shaker motor and control transformer shall be factory wired in a NEMA 4 control panel mounted on the unit for single point wiring. Outdoor NEMA

3R safety disconnect switch shipped loose for field mounting and wiring by contractor. Also included shall be a push button station for remote mounting.

G. Control panel shall be either UL or ETL labeled for compliance with 508A. UL labeled components only is not a substitute. The entire circuit must be listed & labeled. Control panels not labeled by dust collector manufacturer shall be labeled, in field, by a certified UL or ETL representative, prior to placing equipment in operation.

H. The integral non-sparking AMCA Type C direct drive blower shall be located on the clean air side of the filters, top mounted at the factory and be of the backward inclined design with a dynamically balanced impeller. It shall be driven by a

5 HP 3450 RPM, TEFC motor. The blower shall be tested in accordance with AMCA Standard 210. A factory-supplied cover shall protect the motor cooling fan from ice.

I. Discharge noise from the blower shall be attenuated by an external field supported duct silencer fabricated with 4.75 lb.

density inorganic mineral or glass fiber. This media shall be protected from erosion by the airflow through the use of galvanized perforated metal with aerodynamic leading and trailing edges to insure maximum acoustical insertion loss at minimum static pressure drop. Internal integral silencer is not a substitute for the external silencer.

J. Interior and exterior carbon steel surfaces shall be coated with two part epoxy primer and exterior painted with gray two part urethane enamel.

K. Spark Detection / Extinguishment System

1. Programmable Control Panel with built-in automatic and manual sensitivity checking of detectors. The system shall provide supervision on all input and output circuits and shall include Shutdown and Abort Damper relays as well as

Alarm and Trouble relays for notification to Fire Alarm or

PLC panels. It shall be fitted with an LCD display to annunciate alarm and trouble conditions and shall maintain at least 2000 events in a time-stamped, displayable memory.

The control panel shall also have the capability of monitoring a baghouse heat detector and controlling a baghouse deluge.

2. Addressable infrared direct optics spark detectors with built-in calibrated through the lens sensitivity checking and quick release stainless steel flange mounts.

3. Spray assembly c/w self closing, spring-loaded, stainless

23 42 00 - 6 steel nozzle, 24VDC solenoid, water strainer and stainless steel flange mount. Flow rate shall be a minimum of 19

USGPM at 50 PSI. The number and location of nozzles will be in accordance with manufacturers design guide. Contractor shall install the spray assembly and connect to domestic water line. Refer to plumbing drawings for nearest water supply line.

4. A pressure booster pump system shall be supplied to provide sufficient pressure and flow requirements for the spark detection system. The pump shall turn on when the system water pressure drops to 70 PSI and turn off when the water tank pressure reaches 90 PSI thereby maintaining adequate water pressure for the extinguishment nozzles. The following equipment will be furnished complete and mounted on a stand:

a. Multi stage stainless steel pump with 1 phase 115V

AC, 1 HP motor. Motor control contactor with thermal overload protection.

b. 20 gallon controlled action diaphragm water reservoir tank. (Expandable with larger or additional tanks.)

c. Pressure switch with pressure and dead band adjustments.

d. Pressure gauge with PSI and kPa scales.

e. 1” inlet with check valve and 1” discharge.

f. 110V power to pump to be by electrician.

5. Ball Valve and Supervisory switch.

6. Water Flow Monitoring Switch.

7. 24VDC alarm horn with strobe.

8. Set of (2) Backup Batteries.

9. System must be installed in accordance with all of the manufacturer installation requirements, tested and commissioned by a factory-trained technician before placing the system in operation.

3 - EXECUTION

3.2 INSTALLATION

A. Do not operate system until installation is complete.

B. Unit to be installed on concrete equipment pad.

C. Make all final duct connections to each hood and item of dust producing equipment shown and indicated on the drawings.

D. Unit shall be started and checked over by the unit manufacturers recommended factory trained start up technician.

END OF SECTION