MIL-DTL-15606J
4.7 Toxicity. The brick and tile shall be evaluated by the Navy and Marine Corps Public Health Center
(NMCPHC) using the administrative Health Hazard Assessment (HHA). Sufficient data to permit an HHA of the
product shall be provided by the manufacturer/distributor to the NMCPHC. To obtain current technical information
requirements specified by the NMCPHC, see 6.9.
4.8 Spalling. Although there are no test requirements for resistance to spalling, the same level of spalling
resistance is required as for previously supplied products. Where previously supplied products have historically
proven acceptable with regard to spalling resistance, similar grain size, apparent porosity, density, additives, and
formulations of the brick, shall be supplied, provided the brick otherwise conforms to current specification
requirements.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Refractory bricks and burner tile covered by this specification are intended for use in
industrial and naval main propulsion boilers. Brickwork in naval main propulsion boilers is subjected to rapid
change in temperature during frequent light-off and securing cycles that will cause thermal spalling. The purpose of
the refractory bricks and burner tile is to provide structural stability and protection of back-up insulation from
maximum temperatures, flame erosion, slag attack, and rapid temperature changes. Grade A firebrick is more heat
resistant than Grade B. However, Grade A will not be superior to Grade B in all applications. Factors adversely
affecting Grade A are slightly greater thermal expansion and thermal conductivity, and less spall resistance. The
major advantage of Grade B is that under slag attack a gradual wearing away results, as opposed to significant
sudden losses of up to ½ inch that can occur using Grade A or AA brick. The use of distillate fuels has eliminated
this advantage of Grade B. Grade AA is intended as an upgrade for Grade A when high furnace temperatures
require better refractory (heat resistant) properties than Grade A. NAVSEA approved refractory arrangement
drawings should be used to determine firebrick grades for various boiler locations. The physical properties of the
brick grades covered by this specification are shown in table V.
TABLE V. Physical properties of brick grades.
Density (lb/ft3)
Grades
Apparent porosity (%)
Grade AA
18 to 26
152 to 190
Grade A
15 to 29
149 to 181
Grade B
14.5 to 19
134 to 167
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Grade, as applicable to be furnished (see 1.2).
c. When a sample should be subjected to first article inspection (see 3.1). First article testing can be waived if
previously performed by the manufacturer within a 3-year period when there has been no change in manufacturing
location, fabrication procedures, or source of basic fire brick raw materials since the earlier test.
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