50-200 EVAPORATOR FOR CHLORINE
WT.050.200.001.UA.IM.0814
9
EVOQUA
W3T98237
2.4.1
Gas Pressure Relief Valve Discharge
NOTE: The relief valve outlet may be either 1-1/2-inch or 1-inch NPT depend-
ing on valve furnished.
To provide for friction losses, use the following pipe sizes:
Discharge line less than 50 feet long:
use 1-or 1-1/2-inch, schedule 40
carbon steel pipe.
Discharge line 50 to 100 feet long:
use 1-1/2-inch, schedule 40
carbon steel pipe.
The ASME Boiler and Pressure Vessel Code, Section VIII Division 1 UA-356, ap-
pendix M, provides guidance for relief system discharge piping. The following
is an excerpt from that code:
UA-356 Discharge Lines From Safety Devices.
(a) Where it is feasible, the use of a short discharge pipe or vertical riser, con-
nected through long-radius elbows from each individual device, blowing
directly to the atmosphere, is recommended. Such discharge pipes shall
be at least of the same size as the valve outlet….
(b) When discharge lines are long … the effect of the back pressure that may
be developed therein … must be considered ….
(c) All discharge lines shall be run as direct as is practicable to the point of
final release for disposal. For the longer lines, due consideration shall
be given to the advantage of long-radius elbow, avoidance of close-up
fittings, and the minimizing of excessive line strains by expansion joints
and well-known means of support to minimize line-sway and vibration
under operating conditions.
NOTE: It is recognized that no simple rule can be applied generally to fit
the many installation requirements which vary from simple short lines that
discharge directly to the atmosphere to the extensive manifold discharge
piping systems where the quantity and rate of the product to be disposed
of requires piping to a distant safe place.
2.5
Liquid Line Pressure Relief System
If liquid is trapped in the supply pipe between two pipes, liquid expansion can
result in pipe rupture. To avoid this, a means of pressure relief is furnished.
(See the Chlorine Handling Manual.)
Summary of Contents for Wallace&Tiernan 50-200 Series
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Page 2: ...SERIES 50 200 EVAPORATOR FOR CHLORINE BOOK NO WT 050 200 001 UA IM 0814 W3T198237 ...
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Page 95: ...CHLORINE HANDLING MANUAL Cl2 BOOK NO WT 025 000 001 UA IM 0614 W3T98244 ...
