N6660417Q2331_ATTACHMENT_2_Environmental_Chamber_Requirements.docx
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- Solicitation number
- N66604-17-Q-2331
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| N6660417Q2331_ATTACHMENT_2_Environmental_Chamber_Updated_Requirements_REV_9-13-17.docx | DOCX document | |
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Title: Survivability Environmental Chamber Requirements Date: June 8 2017
1.0 General Description
This specification covers the salient design, construction, and performance requirements for a test chamber to be used for subjecting test items to precisely controlled temperature and humidity environments. Capabilities must include automatic control and recording of dry bulb temperature and % relative humidity at any set point within the ranges specified.
| 2.0 | Construction | |
| 2.1 | Size | |
| The minimum workspace inside dimensions will be 72” wide, 96” high, and 150” deep. | ||
| 2.2 | Chamber Exterior | |
| The exterior of the chamber shall be sealed to prevent vapor penetration. | ||
| 2.3 | Chamber Interior | |
| 2.3.1 | The interior liner shall be constructed of Type 304 stainless steel not less than 20 gauge thickness. | |
| 2.3.2 | All seams of the interior shall be heliarc welded and completely passivated and normalized. All seams shall be penetrant dye tested to insure that they are hermetically sealed. The liner shall be reinforced on the insulation side with ribs and the floor will be capable of supporting a minimum of 500 lbs. per square foot uniform load, maximum 8000 pounds. | |
| 2.3.3 | Accessories | |
| 2.3.3.1 | One (1) 24” x 24” heated viewing window located door. | |
| 2.3.3.2 | Six (6) internal low profile light fixtures with an external switch. | |
| 2.3.3.3 | Three (3) 6” diameter utility ports equipped with removable stopper located on both sides of the chamber. | |
| 2.3.3.4 | One (1) manual window wiper. | |
| 2.3.3.5 | One (1) manually operated internal door opening bar (or knob) to allow for exit of the chamber. |
2.3.3.6 One (1) Thermotron Environmental Test Chamber Ramp,
2.3.3.7 Sixteen (16) T-Type Thermocouple connected to the T-8800 series Data Acquisition System,
| 2.3.3.8 | All interior parts of the chamber that are in contact with conditioned air shall be fabricated of non corrosive material. |
| 2.3.3.9 | Chamber shall have a floor drain that will connect to the sanitary sewer system for the purpose of capturing the melting ice or other condensation. |
| 2.4 | Insulation | |
| 2.4.1 | The chamber shall be adequately insulated to maintain ±3 degrees Celsius (°C) temperature variation inside the workspace after stabilization. | |
| 2.5 | Door and Gaskets | |
| 2.5.1 | The chamber shall be equipped with a full front opening door of the same construction as the cabinet to provide full access to the workspace. Door shall be hinged on the left side have a replaceable elastomeric gasket to function as the primary door seal. | |
| 3.0 | Electrical | |
| 3.1 | Control Circuit | |
| 3.1.1 | The control circuit shall include the necessary switches, relays and instrumentation for control of the equipment. The control circuit shall integrate a process controller that is capable of monitoring refrigeration temperature and pressures. The control circuit shall include a programmable high-low temperature cut-out system that interrupts the profile being run and returns to ambient conditions if the temperature or humidity extremes are exceeded. | |
| 3.2 | Power Circuit | |
| 3.2.1 | The electrical equipment shall operate on 460 volt, 3 phase, 60 cycle power. The power circuit shall be controlled by heavy duty relays which have shunt trip circuit breakers. Motors shall be controlled by full voltage magnetic starters with overload elements, or by contactors with integral overload protection. | |
| 3.3 | Electrical Wiring | |
| 3.3.1 | The electrical wiring and components shall conform to the National Electrical Code. Harness wirings shall be used for all control and power circuits and connections are made at numbered terminal strips. | |
| 4.0 | Instrumentation | |
| 4.1 | Operation Location | |
| 4.1.1 | A sheet metal instrumentation panel shall be mounted on the side of the chamber that houses the access ports. All control circuit components requiring operator interface shall be accessible on or from the front of the panel. | |
| 4.2 | Channels | |
| 4.2.1 | The chamber shall have a minimum of two 0 to 10 Volt DC output channels mounted on the instrumentation panel using a Bayonet Neill-Concelman (BNC) connector. Channel one shall provide a linear temperature reading of the chamber’s control thermocouple. Channel two shall provide a linear humidity reading of the chamber’s solid state humidity control sensor. | |
| 4.2.2 | The sensor for the chamber’s control thermocouple shall be housed in a stainless steel braided protective sleeve and be capable of be placed anywhere inside the conditioned space. The sensor for the chamber’s control of humidity shall be fixed in the conditioned space at the location determined by the manufacturer. The high-low temperature cut-out system shall use a fixed mount thermocouple mounted in the conditioned space away from the workspace as determined by the chamber manufacture. | |
| 5.0 | Performance | |
| 5.1 | Temperature Range |
From -65°C to 150°C
5.2 Humidity Range
From 20% to 95% throughout the dry bulb temperature range of 2 °C to 60 °C limited by a 2 °C dew point temperature, also 15% RH to 95% RH at 72 °C.
5.3 Temperature Control Tolerance
To control the dry bulb and wet bulb temperature to within ±3°C of set point, after stabilization at any selected temperature throughout the entire operating range.
5.4 Temperature Change Rate (Chamber Empty)
5.4.1 Pull Down Rate: From +21 °C to -65 °C within 30 minutes.
5.4.2 Heat Up Rate: From +21 °C to 150 °C within 30 minutes.
5.5 Temperature Change Rate (Chamber Loaded)
5.5.1 Pull Down Rate: From +70 °C, 95% RH to -40 °C in less than 120 minutes with a load of 3,000 pounds of aluminum in the chamber. Load will be subjected to +70 °C, 95% RH for a period of 4 hours minimum prior to pull down.
5.5.2 Heat Up Rate: From -40 °C to +70 °C, 95% RH in less than 120 minutes with a load of 3000 pounds installed in the chamber. Load will be subjected to -40 °C for a period of 4 hours minimum prior to heat up.
5.6 Cooling Capacity
The chamber shall have sufficient reserve cooling capacity for absorbing the equivalent of 400 watts at -65 °C after temperature stabilization.
| 6.0 | Miscellaneous |
| 6.1 | Handbook or Manuals |
When the chamber is ready for shipment, the contractor shall furnish one (1) copy of the documentation consisting of one (1) Operation Manual, Drawings, Wiring Diagram, and Parts List.
6.2 Chamber Test
The chamber shall be tested and checked for proper operation and conformance to purchase specifications prior to shipment. Results of the Factory Acceptance Tests shall be reported via CDRL A001
6.3 Installation and Onsite Chamber Test
The supplier shall install the equipment at the Naval Undersea Warfare Center Division Newport RI., Building 114 and provide a field engineer to supervise the installation and startup the equipment, and run all necessary acceptance tests. A report on the results of the Factory Acceptance Tests performed after installation shall be delivered in accordance with CDRL A002. Final inspection and acceptance by Government Personnel shall be at the Naval Undersea Warfare Center Division Newport, RI upon the successful completion and documentation of all Contractor performed tests.
6.4 Limit Switches
It shall be equipped with high-low temperature cutout with manual reset to protect the cabinet against excessive temperatures.
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