Page 439 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Process Safety and Pressure-Relieving Devices 405

Burst Pressure: the inlet static pressure at which a rup- plate) (see Par. UG-A22) but exclusive of any corrosion
ture disk pressure-relieving device functions or opens to allowance or other thickness allowances for loadings (see
release internal pressure. ASME Par.-UG-22) on vessels other than pressure (for
example, extreme wind loadings for tall vessels). The
Design Pressure: the pressure used in the vessel design to
establish the minimum code permissible thickness for
containing the pressure.

Maximum Allotuable Working Pressure (MAWP): the maxi-
mum pressure pounds per square inch gauge permissible
at the top of a completed vessel in its operating position
for a specific designated temperature corresponding to
the MAWP pressure. This pressure is calculated in accor-
dance with the ASME code (Par. UG-98) [I] for all parts
or elements of the vessel using closest next larger to cal-
culated value nominal thickness ( closest standard for steel

em of Materials-BalanSeal
rrBI MllT MAME lllmlllAL
26( )910 s.\-218 GR. �6.
!IIIIJ 26( )826 Cart>on S!ffl
1 Bod';
26( )832 sP..217 GR. WC6, Alloy SL
lllru 26( )836 (1V, ca-w Moly)
26( )810 SA-21& GR. wca.
mru 26( )B26 Carlloo Steel
2 Bonnet
26( )832 SA-2T7 GR. WC6. Alloy St.
Hlrll 26( )836 (1\11 CR-YI Mel\/)
3 Clp.P\aJn� Carbon S!HI
• [Jisc S!ilnlns Sb!ef
5 Nonie 316 St. SL
6 [),s,: Holdv 300 Senes SI. St.
7 Blow Down Flin� 300 Senn St. St.
! SI-Guide 300 Sertllll St. St.
9 Slllm StllnllH SIMI
10 SPllng hl11Jstino Screw Stalnless Sl!!JI
11 Jim Nu! (Spr. Adj, Ser) Stainless Stoel
12 IJJck ScrM (S.U R) Slllinlas SINI
,� LDl:kScrNSDJd Stal,i1%s S!Mt
13
Stirn Retainer
Stainless Steel
15 Bellows 316l St. SL
16 S.llows Gasqt Fll!x, ble Graplllte
Camon Steil
17 St>nnq Bultlln Aust Prooted
ASTM Al9J --
18 Sod)' Stud Gr. 87, Moy St
ASTM A194
19 Ho Nut (Bo�} Gr 2H, Alloy St.
26( )810 Carbon Steel
!liru 26( 1816 Rusi Prool!d
20 Spnnq
26( )820 Hfqn Temp. Alloy
!liru 26( )636 Au!I Proofed
21 C:i.p Gasket Soft lrcn or St•el
22 lkxfy G..sllrt SllN Iron or Steel
23 Bonnel G ul<et Solt Iron or Steel
24 Loek ScrN Gasket Soft Iron or Steel
2!i Hex Nul {B.O.RLS.) Stainlm S1eel
26 Lock Screw (0 H.) Suinleu St&el
'1T Pip, Plug U!ody) Ste&I ·-
Also suitable for liquid service where ASME Code
certification is not required.
Figure 7-4. Balanced nozzle safety relief valve, Balanseal®. By pennission, Teledyne Farris Engineering Co.