In API6D(the 22th edition, 2002) only have the definition
of DBB,not have the the definition of DIB, DBB which is the abbreviation
of bleed and Double. The meaning is double truncated and emissions
In APD6D(the 23th edition, 2008),not only have the definition
of DBB,but also have the the definition of DIB. DIB which is the
abbreviation of Double isolation and bleed.the meaning is double
isolation and emissions.
What have the difference about the two type valve when in the
using ? the valve that general requirements for double sealing
, used in high-pressure gas pipe, Whether to use DIB valve? Currently
DBB valve is still required in the technology specification of
cercuit stop valve used by second line equipment purchasing of
West-East natural gas transmission
Adopt DBB more ,and adopt DIB less.
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