CERTIFLOW®0 pages

CERTIFLOW
ASME
COM PLIA NT
RU PT URE
DISCS

Continental Disc &
LaMOT Brand
Rupture Discs

®

The ASME Boiler and Pressure Vessel Code, Section
VIII, Division 1, specifies that rupture disc devices, like all other
pressure relief products, should be tested and certified as to
their flow characteristics, and that these certified values should
be used in flow and sizing calculations.
Rupture disc products manufactured in accordance with all applicable
rules of ASME Code Section VIII, Division 1 must carry the
Code Symbol
Stamp on the tag, as well as the certified flow resistance (KR) and minimum
net flow area (MNFA) values. The “NB” stamp acknowledges The National
Board of Boiler and Pressure Vessel Inspectors as the organization that
certified the flow tests.
Continental Disc Corporation is accredited and authorized by the ASME to utilize
the
Code Symbol Stamp for product built in accordance with the requirements
of the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1.
The complete line of CERTIFLOW® rupture discs meets all ASME Code requirements,
including KR and MNFA values. With the extensive line of CERTIFLOW rupture
discs, there is one available to meet most applications and operating conditions.
Certified KR values represent tested flow resistance values. Relief systems can
be designed or evaluated more precisely and safely if certified flow resistance
values are used, rather than industry practiced estimates. These estimates may
not accurately reflect the flow resistance of the rupture disc. Using the certified
flow resistance value, along with proper engineering practices, allows precise,
efficient and safe design of relief systems.
“K” values are pressure loss expressed as the number of velocity heads and they
are available for nearly all piping system devices and components, including
rupture discs.
Rupture disc devices should be included in the flow equation in the same manner as
all other system components to determine the relieving capacity of the entire relief
system. Design engineers are provided with certified KR values:
twhich enable the designer to meet ASME Code Section VIII, Division 1 for
relief system design
twhich may permit a reduction in pipe size and associated piping costs when
utilized during a relief system design
tfor use when evaluating relief systems where two-phase flow may occur
tfor use when re-evaluating existing relief systems to comply with design
documentation requirements of OSHA CFR 1910.119. ”Process Safety
Management of Highly Hazardous Chemicals”

PERFO RMANC E

U ND ER

PRESS U RE

®