Attachment Heater Specifications

SPECIFICATIONS FOR PORTABLE LIQUID NITROGEN HEATER

1. GENERAL REQUIREMENTS:

1.1. Purpose: The purpose of this solicitation is to provide specifications for the fabrication of each 30 Standard Cubic Feet per Minute (SCFM) Portable Liquid Nitrogen Circulation Heater. The heaters shall be delivered complete and ready for operation.

2. TECHNICAL REQUIREMENTS:

2.1. Fabrication Criteria:

2.1.1 All material shall be provided by the contractor and detailed in the submitted construction drawings.

2.2. Equipment

2.2.1 Circulation Heater:

Must have 30 SCFM of nitrogen at 200 PSIG from -10°F to 70°F (max change temp.) Gas must leave heater between 50°F and 70°F at conditions listed above. Heater shall provide between 8 W/in2 and 12 W/in2. Heater size shall be minimum 1 KW, maximum 2 KW. Sheath material shall be stainless steel and vessel material shall be steel. Heater shall have minimum 3/8”-16 x 1-1/4” deep mounting lugs (2 each, one set (2) on each end of outer jacket), maximum ¾”-10 x 1-3/4” deep lugs, holes to be on minimum 1”, maximum 2” centers. Heater shall come with weatherproof insulation jacket mounted on it for outdoor installation. Material of jacket shall be steel with aluminized surface and shall be welded to outer jacket of heater. Size of heater shall be as follows:
Maximum length = 40 Inches
Maximum width = 18 inches (including controls and control cover) Size of outlets shall be ½” MNPT.
Heater and controls shall operate with 208V.
The heating unit and controls shall be on a portable cart with wheels and a pull handle.

2.2.2. Controls:

Controls shall be covered with a weatherproof fiberglass enclosure with a glass front access. Controls shall be as follows:
1) J-type Thermocouple – one in the outlet pipe (tapped into tee of outlet pipe) and one welded to the heating element. 2) Process Controller – Digital, Range 0-999o F, on/off control, selectable from front panel, set point accuracy of +/- .1% span, dead band of 2.5 oF changeable to 10oF, to be used with thermocouple tapped into tee. 3) High Temp controller – digital, range 0-1000, on/off control, selectable from front panel, set point accuracy of +/- .1% span, dead band of 2.5 oF changeable to 10 oF, to be used with thermocouple welded to heating element.

3. DELIVERABLES:

In addition to the heaters meeting the specifications of Sections 1 and 2 above, the following deliverables are to be included as part of this contract.

3.1 Drawings:

3.1.1. Within 30 working days after contract award, the successful bidder will submit a complete set of drawings (including all structural, mechanical, and electrical) and complete list of materials with material specifications to NNSY for review and approval. No material procurement or manufacture of the heating units is to commence until after the plans and associated bill of materials are approved in writing by NNSY. NNSY will review and approve or disapprove the drawings and list of material within 20 working days after receipt at NNSY.