S01_Attachment A - Scope of Work.pdf

Seed Storage Cooler Dehumidifier Replacement Scope of Work

USDA-NRCS

Elsberry Plant Materials Center 2803 N. Hwy. 79

Elsberry, MO 63343 POC: Ron Cordsiemon, PMC Manager

Background/Overview:

This work will be conducted at the Elsberry Plant Materials Center (MOPMC) located at 2803 North Highway 79, Elsberry, MO. The dehumidifier unit (Una-Dyn) servicing the MOPMC climate-controlled seed storage cooler unit (6,952 ft3) is in poor condition and over 40 years old. The party awarded the contract to perform this work is responsible for the removal of the existing dehumidifier unit and the installation of a new dehumidifier unit to service the MOPMC climate-controlled seed storage cooler unit. The dimensions of the MOPMC climate-controlled seed storage cooler unit are shown in Table 1.

Table 1. Dimensions of the MOPMC climate-controlled seed storage cooler unit.

Contract Requirements:

16.5'

28.5'

12'

13.5'

28.5'

15' The climate controlled seed cooler has a ceiling approximately 11 feet tall.

Current loca�on of dehumidifier

• Disconnect/uninstall, remove, and dispose of the nonfunctional dehumidifier unit (Una-Dyn) currently installed.

• The party awarded the contract to perform this work is responsible for the purchase, delivery, and installation of a new dehumidifier unit.

• Install a new dehumidifier unit that meets minimum specifications (Munters HC‐300 desiccant dehumidifier meets our requirements).

o Dehumidifier shall be of a type proven in satisfactory operation for a minimum of 10 years. Dehumidifier shall be of the non-cycling sorption type with a single desiccant rotary structure. The casing will be fabricated as a unitized body with welded aluminum construction for maximum strength and durability. Suitable access panel shall allow access for inspection or servicing without disconnecting ducting or electrical wiring. Airflow balancing dampers to be furnished.

o The rotary structure shall be a monolithic fabricated extended surface consisting of inert silicates reinforced with uniform diameter glass fibers for maximum strength. The fabricated structure shall be smooth and continuous in the direction of airflow without interruptions or sandwich layers which restrict airflow or create a leakage path at joining surfaces. Desiccant shall not channel, cake or fracture due to repeated temperature and moisture cycling. The materials of construction shall be water washable, non-toxic and NFPA 255-ASTM E84 compliant.

o Full face contact pressure seals shall be provided to separate the process and reactivation air streams and eliminate detrimental leakage of air or moisture with static pressure differentials of up to 3" of water gauge.

o Dehumidifier shall be factory assembled; fully automatic, complete with HoneyCombe® desiccant wheel, reactivation heaters, reactivation energy control system, roughing filters, industrial drive motor, fans, non-racheting desiccant drive unit, automatic controller and all components’ auxiliaries. Reactivation energy modulation shall be stepless solid state proportioning type. Dehumidifier shall be functionally tested at the manufacturer’s factory and shipped complete with all components necessary to maintain normal operation.

• The new dehumidifier shall be installed at a minimum height of 4 feet above the floor at a predetermined location based on pictures provided and a site visit performed.

• Installation to include any mounting equipment (bracket, hardware, etc.), air vents, insulation, and electrical needed for a walk-in seed storage cooler. New dehumidifier will be contained in the seed storage cooler and will be located in the area above existing dehumidifier.

• Mount and connect new manufacturer recommended humidistat controller for new dehumidifier unit.

• Provide necessary wall penetrations for air exchange along with ducting and grilles required.

• Install new stainless-steel ductwork for process air outlet inside seed storage cooler so that process air intake/outlets are located on opposite ends of the seed storage cooler and arranged appropriately in relation to the cooling unit as per manufacturer recommendations to maximize unit efficiency.

• Utilize any wall penetrations for new ductwork where appropriate as to minimize any further holes being created in the walls.

• Properly seal all wall penetrations to prevent condensation or water leakage.

• Patch any interior and exterior wall borings from the disposed dehumidifier unit if unused for the new unit to ensure proper insulation and moisture retention.

• Any tools, equipment, or other materials necessary for the proper installation are the responsibility of the party awarded the contract to perform this work.

• Provide start up and adjustment of dehumidifier unit for proper operation (relative humidity within the seed storage cooler of less than 40% at a temperature of 45-50 °F).

• Clean up of jobsite upon completion.

Additional Items of Work:

• This work must be performed during normal working hours (Monday-Friday, 8AM-4:30PM) and not on federal holidays. No overtime labor included.

• All equipment and infrastructure modifications specified for above shall be installed and conducted according to prevailing federal, state, township/municipality codes and manufacturers’ installation guidelines.

• The party awarded the contract to perform this work is responsible for following all local building/construction ordinances and for securing any required permits.

• The party awarded the contract to perform this work is responsible to properly dispose of and remove all materials resulting from the work described.

Map of seed storage cooler / dehumidifier locations:

Figure 1. Aerial view of MOPMC grounds showing locations of seed storage cooler and dehumidifier.

Seed cooler at Elsberry Plant Materials Center

Photos:

Figure 2. Existing dehumidifier unit.

Figure 3. Current connections inside seed storage cooler unit between dehumidifier and wall.

Figure 4. Safety switch for electrical service to dehumidifier unit.

Figure 5. Outside seed cooler connections from existing dehumidifier unit.