Page 454 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

420 Applied Process Design for Chemical and Petrochemical Plants

tification of the metallurgy (if metal) or other properties
if graphite or plastic, and the disk must be guaranteed by
the manufacturer to burst within 5% (±) of the specified
bursting pressure at the rated temperature. - ANSI flange
Std
The connection nozzle holding the disk must have a
net cross-sectional area no less than that required for the
design rated conditions of the disk.
The certification of disk performance is to be based on
actual bursting tests of two or more disks from a lot of the
same material of the exact same size as the disk to be sold
by the manufacturer. The holder for the test disks must be
identical to the design, dimensions, etc., for the disk ,---,,------ Optional TFE liner blocks
being certified. (See details ASME code, Par. UG-127 [l]). water and dirt from disks
in open vents.
Pressure Settings and Design Basis

Unfired steam boilers, i.e., nominally termed waste heat
boilers or, heat exchangers, which generate steam by heat
interchange with other fluids (See ASME code [I] Par. U-

Duplex
DUPLEX Disks extend corrosion resistance
to highly oxidizing agents. halogens except
Std
free fluorine, and virtually all other cor- - ANSI flange
rosives. A sheet of PTFE is used as a bar-
rier on the service side of the disk. See page
12. Additionally. these disks are processed
to accommodate temperatures to 392F L.....H-=---Gaskets
without insulation. L--1'----- TFE liner

- ANSI flange
Std
"����-··· !J: • J
Flow arrows (2)

*Insulated
INSULATED Disks are available in MONO, g:::;:;��s
INVERTED. and DUPLEX styles to accom-
modate temperatures exceeding 338F to
700F. They are furnished as an attached -!. � ..
unit as shown because the nameplate rat- F-----1-n- s u- l a-t � i on J
ing of the disk must be established at the nameplate
cold face temperature of the insulation. 4!.....::��-- Gaskets (all included)

Std AAR vent
-

Figure 7-9E. Duplex and insulated disks. By permission, Zook Enterprises.