Page 501 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Applied Process Design 467

Spec, DwQ, No.
Job No, A·
Po ge of
8/M Na, _ Unit Priee
No. Unih
c= SAFETY VALVE SPECIFICATIONS Item No.
DESCRIPTION
�
�
r::--==============·=========-M_o_d_o= I -= --------=====_= =T=y=p- • ·"!'t- , ." P-,:i_ - . -==S=t=a=n=d=a==rd================---
��� � ••
Sise (Inlet• Odflco No, • Outlet) x x Phose Llguid
i 157 ( PSIG ) 100 0
Set Pres, ( xxx )@ OF Full Flow Back Pren, PSIG
0.0951 0.110
Req'd Orlflco Area Sq, In,; Salec1ed Orifice Area So, In
2
AcC'•••orles No ii ft gear,No finned bonnet, Mo test gag
2
Inlet Nozzle: Pren, Clau 1 "' • 150# F aclnq Raised
2" , 150# Raised
Outlet Nozzle1 Pieu, Closs Facln9
Miii''•• Rating 230 PSIG (Max)@ 100 OF: 160 PSIG (Min)@ !!50 .,
1 2
Refers to lnl�al Veasel reliaf pressure, Ref•rs to cop type, lifting gear, gag, etc,
MATERIALS
Body and Bonnet Ca�t csirbQD 2t!il�l Trim Stainless Steel
orged stainless steel None
Nozzle ond Disc Befl ew s
Spring r;i,-hnn <: �001
REMARKS
U•• th, ... way �Ive (Yesj (No) tfo
..eJ..ant stacdacds dc_nat accept ]" flanged ccaaecticas, tberefore use ]!"

PROCESS RATING DATA
I Loco ti on 95% Aqua Ammonia Flow I Ube fa1 lure ana Set prossure
Shel! sjde Qf heater
Fluid
0
z Sy1t.m o.,.,. Prou. 30 ( she I I) PSIG@ 275 Based On ptll7 eapaeit, Ba sod On ...M,a}( \Jack 1 og Pr.c
°掩ȈF: MW·
. I Req'd Cap. 40 gpm Lba/Hr,@ 100 25 • F* %: Bade Prd>ss. Corr. Factor None 36 L i»/Cu. Ft
Liquid
liquid
Phu,e:
Oen•.•
• .
0.05 cp
overpressure
•
a. )- Liq. Vf•C'O•ity• 1� Al:c�tllln
• Rofer1 to propertio• at Set Pressure
..
0
.
u CAL CULA Tl ONS
c
0
� . Max �lork i ng Pressure (Shell Side) = 210 psig
... * For 25% accumulation, set pressure= (0.75)(210) = 157 psi g
c ·"Re 1 i ev i ng pressure@ 10% overpressure =[157 + 10%]+(14;1) = 187.4 psi a
0
•
0 For Liquid Relief: per ASME Code
"" u 0 I A = GPM ( � SpGr )/ 38,o Kd�AP (Ku) -
iii
I • z Kd = o.64 ; K = 1.0@ normal viscosity; GPM = 40
�
AP ='157 + 100(157) - 0 = 172.7 psig
I Sp Gr = 36/62,3 = 0.578
• • I A = (40) ( \/ 0.578) I 38 (0.62) ( yT-iG ) =0.0981 Sq. In. in.
o.864 sq.
)- Select 1" std. pipe size with cross-sectional area =
l
Sy I Chk'd JApp, I Rev, J Rev, J Rev,
Date I I I I I
Figure 7-34. Safety relief valve specification for liquid overpressure example.