Page 436 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

402 Applied Process Design for Chemical and Petrochemical Plants

gas, vapor, and liquid systems. See Figures 7-7B, 7-8A An explosion rupture disc is a special disc (or disk
through R, and 7-9A through F. There are at least four designed to rupture at high rates of pressure rise, such ,
basic types of styles of disks, and each requires specific run-away reactions. It requires special attention from th
design selection attention. manufacturer [35].

Other rupture devices suitable for certain applicatior
are [35]:

a. breaking pin device
b. shear pin device
c. fusible plug device

Pressure-Vacuum Valves: See page 458

Bill of Materials-Conventional

ITEM PART NAME MATERIAL
28( )A10 SA-218 GR. Ytt8.
thru 26( )A26 C1r110n Steel
1 Body
26( )A32 SA-217 GR. WC6, Allor SI.
thru 26( )A36 (1'4 CR-Y, Moly)
26( )A10 SA-216 GR. WCB,
thru 26( )A26 Carbon Steel
2 Bonnel
26( )A32 SA-217 GR. WC6, Ala/ St
thru 26( )A36 (1'4 CR-Y, Mott)
3 Cap. Plain Screwed Cal1>on Steel
4 Disc Stainless Sl!el
5 Nozzle 316 St. St.
6 Disc Holder 300 Series St. St.
7 Blow Down Ring 300 Series St. SI.
8 Sleew Guide 300 Serias St. SI.
9 Stem Stainless Steel
10 Spring AdjusUng Screw Stainless Steel
11 Jam Nut (Spr. Adj. Ser.) Stainless Steel
12 Lock Screw (B.D.R) Stainl11$1 Steel
13 Lock Screw Stud Statnleu Steel
14 Stem Retainer Stainless St?et
Clrl>On Sllel
15 Spring Button Rust Proofed
ASTMA193
16 Body Stud
Gt 87. Alloy St.
ASTMA194
17 Hex Nut (Body)
Gt 2H, Alloy St.
26( )A10 Calbon Steel
thru 26( )A16 Rust Proofed
18 Spring
26( )A20 High 11"". Al/af
thru 28( )A36 Rust Proofed
19 Cap Gasket Son lrvn or Steel
20 Body Gasket Soft Iron or Sllel
21 BometGasklll Soft Iron or 51111
22 Lock Screw Gasllat Soft Iron or SINI
23 Hex Nut (B.D.R.L.S.) S1llnllll 511111
24 Lock ScllJW (D.H.) Stalnless SINI
25 Pipe Plug (Bonnel) SINI
26 Pipe Plug (Body) SINI
Also suitable for liquid service where ASME Code
certification is not required.
Figure 7-3. Conventional or unbalanced nozzle safety relief valve. By permission, Teledyne Farris Engineering Co.