3.3.1
Hot Flushing Method
Hot flush the system for one hour using heated fresh water.
No part of the
system shall go below 43 degrees C 110 degrees F.
3.3.2
Hot Recirculating Flush Method
Perform hot recirculating flush for one hour. Heat water during flushing
so that no part of the system falls below 43 degrees C 110 degrees F.
After completing the hot recirculating flush, flush the system with cold
fresh water for 15 minutes.
3.3.3
Cold Soak Method
Cold soak the system using fresh water at not less than 15.50 degrees C 60
degrees F for 12 hours. Following the 12 hour soak, flush the system with
fresh water at not less than 15.50 degrees C 60 degrees F for 4 hours.
3.4
FIELD QUALITY CONTROL
3.4.1
Examinations
3.4.1.1
Welding Examinations
**************************************************************************
NOTE: The paragraphs will be edited and inserted if
necessary to ensure proper implementation of the
"CONTRACTOR QUALITY CONTROL PROGRAM." The
specification writer or design engineer must
indicate how much quality control of welding is
needed for each project and who is to be
responsible, i.e., primarily the Contractor or the
Government. Rarely will a project require 100
percent testing of welds by NDE methods. The
designer must determine the required methods and the
extent of inspection and testing and must indicate
the extent in this section of the project
specifications or on the project drawings by notes,
nondestructive test symbols, or other means. Table
II at the end of this section was developed from
MIL-STD MIL-STD-278, "Fabrication, Welding and
Inspection, and Casting Inspection and Repair for
Machinery, Piping, and Pressure Vessels in Ships of
the United States Navy." The referenced applicable
publications and Army Technical Manual, "WELDING
DESIGN, PROCEDURES AND INSPECTION," TM-5-805-7, may
be used for guidance in determining inspection and
testing requirements. The specifications or
drawings must clearly indicate which joints require
100 percent NDE inspection, which joints require
random NDE inspection, and which NDE methods are to
be employed for each joint. For random inspection,
the drawings must indicate the location, number of
joints, and minimum increment length of weld that
will be subject to NDE inspection without
predisclosing the exact spots to be examined.
Joints not indicated to be tested by NDE methods
shall be subject to visual inspection only. In
cases where the nature of the welding is such as to
SECTION 15212N
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