Page 90 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

74 Applied Process Design for Chemical and Petrochemical Plants

(table 2-2 continued from previous page)

GATE VALVES SWING CHECK VALVES
Wedge Disc, Double Disc, or Plug Type

K- 100/r K - 50/r
If: {j - I • 8 - 0 . . . . . . . . . . . . .. K1 - 8 fr Minimum pipe velocity Minimum pipe velocity
{j < 1 and 8 � 45° K2 - Formula 5 (fps) for full disc lift (fps) for full disc lift
{j < 1 and 8 > 45° � 180° K2 - Formula 6 -35 VV -48-VV
-------------------+-----------------�--�--

LIFT CHECK VALVES
GLOBE AND ANGLE VALVES

c If: {j < 1 K1-6oo/r
{j-1
K2 - Formula 7
Minimum pipe velocity (fps) for full disc lift
If: {j - 1. .. K1 - 340 fr -40 tp'VV

If: {j - I K1 - 55 fr
{j < 1 K2 - Formula 7
Minimum pipe velocity (fps) for full disc lift
- 140 ,, vv
-----·-·-

TILTING DISC CHECK VALVES

-. - 50 .l - 150
If: {j-1 ... K1-15ofr If: {j-1 ... K1-55fr Sizes 2 to 8' K - 120/r
Sizes 10 to 14' K - qofr
All globe and angle valves, Sizes 16 to 48' K = 6ofr
whether reduced seat or throttled, Minimum pipe velocity 8o 'VV
If: {J < 1 ... Kt - Formula 7 (fps) for full disc lift - 30-VV