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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Proposed Rules TABLE IV.2REPRESENTATIVE TANK CHARACTERISTICS

0 to 100
101 to 250
251 to 500
501 to 1000
1001 to 2000
2001 to 5000
>5000

In response to the August 2019 RFI, BWC stated that most manufacturers use polyurethane foam to insulate UFHWSTs, although fiberglass may be used in certain areas or on certain tanks where it is difficult to apply foam.
BWC, No. 5 at p. 2 As discussed in section IV.C.1 of this document, in its energy use analysis, DOE divided the surface area of each tank, at each EL, into several zones and assigned a representative R-value to each zone depending on the expected insulation type and thickness. Although most tank surfaces can be insulated with 2 inches of polyurethane foam, it is not practical to insulate all surfaces with polyurethane foam due to the insulation application process or the need to retain
Representative dimensions
Representative volume gal.

Volume range gal.

access to certain ports. In particular, it can be difficult to insulate the areas surrounding fittings, manholes or handholes, and the tops or bottoms of tanks with polyurethane foam, so DOE
accounted for the use of other insulating materials in those areas. Similarly, certain fittings and ports will remain uninsulated due to the need to be accessible, situations for which DOE
also accounted in its analysis.
In publicly-available equipment literature, DOE observed that the typical number of ports on UFHWSTs ranged from 5 to 11. These ports can include an inlet port, an outlet port, a temperature sensor, a temperature and pressure relief valve, a drain, a recirculation valve, one or more ports for anode rods, and other custom fittings. In its energy use
Height in.

50
175
375
750
1500
3500
5000

Diameter in.
47
65
72
141
124
168
180

22
28
42
42
60
84
96

analysis, DOE selected 7 ports as a representative number of ports. DOE
further assumed that a 2-inch-wide ring of fiberglass would be placed around each port. DOE also included a small area 1.5 inches in diameter of uninsulated tank at each port to reflect losses through adjoining pipes or fittings. Wherever fiberglass was modeled as the insulation for tanks, the thickness of fiberglass was the same as the thickness of polyurethane foam on the same tank which for the analysis in this NOPD, depends on the EL because the thickness of insultation would be uniformly constrained by the outer metal jacketing on most UFHWSTs. The R-values for each insulation type and at each EL are shown in Table IV.3.

TABLE IV.3INSULATION R-VALUES
R-value per inch
Material
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Polyurethane Foam
Fiberglass
Bare Tank free convective heat transfer to air

Based on feedback from manufacturers and its own review of publicly-available materials, DOE also assumed that the tank tops would be covered with fiberglass instead of polyurethane foam, and that an extra maintenance access port a 6 inch by 4
inch hand hole for tanks with storage volumes up to 500 gallons, or a 12 inch by 16 inch manhole for tanks with storage volumes greater than 500
gallons would be partially covered with fiberglass and partially bare.
DOE requests comment on the inputs and assumptions used in its engineering analysis. In particular, DOE requests input on its choice of representative volumes, its assumptions about the typical coverage of various insulation materials, and its estimated R-values for
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3. Cost Analysis The cost analysis portion of the Engineering Analysis is typically conducted using one or a combination of cost approaches. The selection of cost approach depends on a suite of factors, including the availability and reliability of public information, characteristics of the regulated equipment, and the availability and timeliness of purchasing the equipment on the market. The cost approaches are summarized as follows:
Physical teardowns: Under this approach, DOE physically dismantles commercially-available equipment, component-by-component, to develop a detailed bill of materials for the equipment.

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EL0

6.25
3.5
N/A

each insulation material at each EL
considered.

PO 00000

Effective R-value EL1
12.5
7 0.33

15.625
8.75
0.33

EL2
18.75
10.5
0.33

Catalog teardowns: In lieu of physically deconstructing equipment, DOE identifies each component using parts diagrams available from sources such as manufacturer websites or appliance repair websites to develop the bill of materials for the equipment.
Price surveys: If a physical or catalog teardown is infeasible e.g., for tightly integrated equipment such as fluorescent lamps, which are infeasible to disassemble and for which parts diagrams are unavailable, costprohibitive, or otherwise impractical e.g. large commercial boilers, DOE
conducts price surveys using publiclyavailable pricing data published on major online retailer websites and/or by soliciting prices through distributors or other commercial channels.
As discussed in section IV.D of this document, DOE did not conduct a cost
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