Hydrant Systems

MIL-HDBK-1022A

one manhole for tanks between 1,000 gallons (4000 L) and 5,000

gallons (19 000 L). Provide a minimum of two manholes for

tanks larger than 5,000 gallons (19 000 L). Provide manhole

containment sumps for all manholes.

12.4.2

Interior Coatings. Coat underground operating tanks

in accordance with Section 8 of this handbook.

12.5

HYDRANT SYSTEMS. Decisions concerning major

rehabilitation of existing direct aircraft refueling systems

will be made by Service Headquarters. This paragraph

addresses existing direct aircraft refueling systems (Type I

and Type II) which can be rehabilitated or modified to meet

fuel quality standards, safety requirements, mission

requirements, and environmental regulations. All designs

should be accomplished by an engineering firm regularly

engaged in the design of direct aircraft fueling systems. The

provisions of Section 4 of this handbook are applicable.

12.5.1

Pumps. Repair or replace existing pumps to meet

increased fuel demands. Rebuild pumps including complete

bearing replacement, additional bowls or increased impeller

size, replacement of mechanical seals, shaft lengthening or

shortening to match replacement tanks, etc. In some cases,

additional capacity can only be achieved by total pump

replacement or rearrangement of piping. Consider pump

replacement where, due to equipment age or condition, it is

more economical to replace than to rebuild. Pump and motor

replacement may also result in higher efficiency units with

lower power demands and increased spare part availability.

12.5.2

Filter/Separators. Existing filter/separators must

be capable of meeting requirements of API Publ 1581. API

filters provide superior filtration and water removal required

of high performance aircraft. A majority of existing

filter/separators can be upgraded to the API elements.

Consider vessel replacement if the existing unit cannot be

converted to API elements or if the unit (with API elements)

fails to meet quality standards. Issue filter/separators

should be given priority for upgrade on a stand-alone project.

Upgrade of all filter/separators is mandatory on any major

rehabilitation project.

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