CEMP-E
TI 800-03
1 July 1998
Direct-buried systems shall only be provided where aesthetics or functional requirements
preclude the use of aboveground or shallow concrete trench systems. Require direct-buried
systems to use fixed-end seals only. Do not allow gland-type end seals. Direct-buried
systems, when used, shall be in accordance with CEGS 02695 and the following criteria.
Definitions for site classification are included in CEGS 02695.
Buried Class A Sites:
Where a direct-buried system is required, only allow prefabricated, drainable, dryable, air
pressure testable (DDT) systems with steel casings.
Buried Class B Sites:
Where a direct-buried system is to be provided, only allow prefabricated DDT systems with
steel casings or water spread limiting systems.
Buried Class C and D sites:
Where a direct-buried system is to be provided, only allow prefabricated DDT systems with
steel casings, prefabricated water spread limiting systems, or field-fabricated, insulating,
powder systems.
10-2. LESSONS LEARNED. The following subparagraphs contain recommended information
that should be considered in RFP's in order to avoid past problems, define engineering
requirements, define design submittal requirements, and ensure a level of quality. These
lessons learned should be reviewed and incorporated as appropriate in each new project.
a. Fixture Selection. Fixture descriptions shall be as described by the American Society
of Mechanical Engineers, ASME A112.19, or other equivalent commercial item descriptions.
b. Compressed Air. If capacity requirements are known or can best be determined by
the Government, they will be included in the RFP. This may include size and capacity of the
air compressor and accessories. Also, pipe sizes, air outlet locations and similar features may
be included, as appropriate. If the air compressor design is dependent upon the equipment,
layout, or other facility options or alternatives selected by offerors, the criteria for designing the
compressed air system must be included in the RFP, and the final, detailed, design must be
provided by the successful Design-Build contractor. When appropriate, the compressed air
system design or features will be included as part of each proposal and used in the
evaluations.
c. Gas Piping and Gas Distribution Systems, Fuel Piping, and Heat Distribution
Systems. If we want the Design-Build contractor to submit record copies of procedures or
reports they should be required in the RFP specifications.
d. Natural Gas Distribution Systems. Require the design and installation of natural gas
distribution systems and equipment to be in conformance with the manufacturer's
recommendations and applicable sections of ASME B31.8, AGA-01 and CFR 49 Part 192.
10-2
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