1. General Description:
The Oxygen Generator shall produce a minimum of Standard Cubic Feet per Hour (SCFH) of Oxygen Gas from a source of clean, dry, compressed air*.
*The specification for the feed air quality us the ISO Specification 8573.1, Class 4. It states: Maximum Dust Particle size is 15µm; Maximum Oil content, including vapor, is 5 ppm; and Maximum dewpoint at 100 psig is 37°F or 940 ppm.
*The specification for the feed air volume is Standard Cubic Feet per Minute (SCFM) on average, and requires that it be available from an Air Storage Tank, located immediately before the Oxygen Generator, with a storage capacity of at least gallons.
The Oxygen Gas produced by the Oxygen Generator shall meet the United States Pharmacopoeia (USP) Specification for Oxygen 93 Percent, 17th Edition, 1997. It states that the Oxygen have a concentration of 93.0%. +/- 3.0%.
The Oxygen Gas produced by the Oxygen Generator shall be available from an Oxygen Storage Tank with a storage capacity of at least gallons at a minimum pressure of 45 psig (3 Bar), and typically be in the range of (50 psig to 60 psig, 3.4 Bar to 4.0 Bar).
The Oxygen Gas produced by the Oxygen Generator shall have a Maximum dewpoint of -76°F(-60°C) and typically be in the range of -100°F(-73°C).
The Oxygen Generator shall be painted green, which normally identifies equipment, transmission lines and hoses as containing Oxygen.
The Oxygen Generator shall be made in the USA.
2. Design Requirements:
The Air Separation Technology used shall be Pressure Swing Adsorption (PSA) utilizing a two bed system with both Pressure Equalization and Gas Purging to enhance system efficiency.
The Sieve beds of the Oxygen Generator shall be designed, built, tested, inspected and stamped ('U'- stamp only, not 'UM' stamped) in accordance with the American Society of Mechanical Engineers' (ASME) Boiler Code, Section 8, Division 1.
The electrical and pneumatic controls for the Oxygen Generator shall be located inside an electrical enclosure box. This box shall conform with the National Electrical Manufacturers Association (NEMA) Standard for Type 12 boxes (rated by the International Electrical Commission, IEC as IP 55). Which are general industrial enclosures and provide a degree of protection against dust, falling dirt and non-corrosive liquids.
An electrical enclosure box rated as NEMA 4X (IEC rated IP 66) shall be optionally available. Which will provide a degree of protection against corrosion, windblown dust and rain, and splashing or hose-directed water.
The operation of the Oxygen Generator shall be controlled by a Programmable Logic Controller (PLC) which meets Conformite European (CE) guidelines for Noise Immunity and Radio Frequency Interference (RFI).
The PLC shall have at least one RS-232 data communication port.
The wiring connections inside the enclosure box shall be made to valves, switches and power distribution terminals through DIN- rated electrical connectors.The entire system shall be rated 'Touch-Safe' and Compliant with CE Machinery Safety Regulations.
The DIN electrical connectors to the process control valves shall have internal lights to indicate when each valve is energized.
The wiring color shall conform to the International Standards Organization (ISO) Standard for Wiring Color Code (Brown-Hot, Blue-Neutral, Green/Yellow-Earth).
The electrical power consumption of the Oxygen Generator shall be less than 0.5 KW. The power supply shall be from a single phase source of 115 VAC at 50/60 Hz. An optional power supply configuration from a single phase source of 230 VAC at 50/60 Hz shall be available.
The process control valves shall be mounted in a horizontal and upright orientation to minimize valve wear and facilitate easy maintenance.
The Oxygen Generator shall have both lifting lugs, to move it via connection to an overhead crane and forklift slots, for carriage by forklift.
3. Instrumentation and Controls:
The Oxygen Generator shall have a single, internally-lighted, three position control switch. The three positions of the switch shall allow the operator to select the mode of operation (Off, Continuous Cycling, or Automatic Operation).
The Oxygen Generator shall have a non-adjustable Digital Hours meter that records running hours.
The Oxygen Generator shall have an internal pressure switch which will turn the Generator on and off based on the Oxygen Storage Tank pressure. This switch will only be affective while the 'Automatic' mode of operation is selected on the Control Switch. The pressure switch set points shall be factory set, but be adjustable for modification.
The Oxygen Generator shall have a dial gauge to indicate the Regulated Feed Air Pressure as feed air enters the Oxygen Generator.
The Oxygen Generator shall have a dial gauge to indicate the Oxygen Discharge Pressure as it departs the Oxygen Generator.
The Oxygen Generator shall have a manual push button to vent accumulated condensate in the filter bowl housings.
The PLC controlling the Oxygen Generator shall have indicating lights which indicate the point in the separation process the Generator is at while it cycles.
4. Testing, Certification, and Warranty:
The unit shall be tested at the OGSI facility for a minimum of 4 hours at the rated output, monitoring Oxygen Flow Rate, Oxygen Delivery pressure and Oxygen Concentration.
The Buyer may witness the testing during the test period and inspect the unit at that time or at any time prior to crating for shipment from the manufacturer's facility.
A Certificate of Conformance to the Test Parameters shall be available to the Buyer Upon Request.
A Certificate of Origin indicating the unit to be 'Made in the USA' shall be available to the Buyer Upon Request.
The manufacturer shall provide the Buyer up to one-half day of training on the operation and maintenance of the Oxygen Generator, Free of Charge, at the Manufacturer's facility.
The manufacturer shall provide a Warranty on the unit, that it is free of defects in parts or workmanship (in accordance with manufacturer's Standard Warranty policy), for a period of 12 months from date of shipment. This period will be extended to 18 months from shipment in cases where startup does not occur within the first six months from the date of shipment, but in no case shall be longer than that.-
