chlorine tank car shutoff systems 01012004-2 - brine...
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Chlorine Tank Car Shutoff Systems
www.brinechlor.comwww.powellfab.com
Click to edit Master title styleP 57 Guidelines
• Fail-safe valve closure to isolate the flexible transfer hoses in the event of the following:– Any chlorine leakage detected– Excessive railcar motion– Loss of utilities– Manual activation
Click to edit Master title stylePamphlet 57 Basics
Click to edit Master title stylePotential Minor Leak Points
OPTIONAL PAD / RECOMPRESSED GAS LINE
PRODUCT OUTLET / INLET
3.4.2.
1.
2. Threaded fittings at railcar dome, angle valve outlet, stub pipe, elbows, and unions
3. Transfer hose “pin-hole” leaks
4. Instrumentation connections, process valve packing, gaskets and o-rings
1. Railcar angle valve packing
Click to edit Master title stylePotential Major Leak Points
PRODUCT OUTLET / INLET
OPTIONAL PAD / RECOMPRESSED GAS LINE
5.6.
5. Stub pipe failure / breakage
6. Transfer hose failure
Click to edit Master title styleExternal Railcar Valve Layout
PRODUCT OUTLET / INLET
OPTIONAL PAD GAS LINE
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
Consisting of fail-closed automatic valves in the piping, adjacent to the railcar angle valves
Click to edit Master title styleExternal Valve Installation
The use of a single liquid valve limits the chlorine flow to 15,000 pounds/hour
Click to edit Master title styleAngle Valve Pneumatic Actuator Layout
UniPro™ HoseReel
UniPro™ Air Receiver
UniPro™
UniPro™ Air Control Unit
-40Dew Point Air (at operating pressure)Or Nitrogen Inlet
PRODUCT INLET / OUTLET LINE
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
OPTIONAL PAD / RECOMPRESSED GAS LINE
Physically closes the railcar angle valve to protect against all leak points.
Click to edit Master title styleAngle Valve Pneumatic Actuator Installation
Click to edit Master title styleChlorine Flow Limitations
Excess Flow Valves– Typically rated for
15,000 pounds / hour– Seat diameter of ½”
equivalent to Cv 13– Designed to reduce
flow during valve shearing (rollover)
1” Angle Valves– Various approved
manufacturers– Low flow coefficients.
Ranging from 14.3 Cv to 23 Cv.
– Outlet pressure decreases as flow increases
Click to edit Master title styleFlow Comparison
1” Chlorine Transfer Hose Two 1/2” Excess Flow Valves
0.988” 0.5”
Area = 0.766 In2
Area = 0.19625 In2
0.5”
Total Area = 0.3925 In2
Click to edit Master title styleIncreased Chlorine Flow
• Many industrial consumers must make use of the second liquid valve to increase chlorine flow capacity
• Adding a second liquid line increases hardware and control system cost and complexity
• Potential leak paths are increased• Maintenance costs are increased
Click to edit Master title styleDual Liquid Valves, Dual Liquid Hoses
PRODUCT INLET / OUTLET
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
OPTIONAL PAD / RECOMPRESSED GAS LINE
Layout prior to current P-57 guidelines
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OPTIONAL PAD / RECOMPRESSED GAS LINE
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
PRODUCT OUTLET / INLET
Angle Valve Actuators Not Shown
Dual Liquid Angle Valves with Dual Liquid Transfer Lines
Click to edit Master title styleDual Liquid Valves, Single Hose Layout
PRODUCT INLET / OUTLET
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
OPTIONAL PAD / RECOMPRESSED GAS LINE
Angle Valve Actuators Not Shown
Click to edit Master title styleDual Liquid Valve Installation
Liquid Valve & Actuator
Liquid Valve & Actuator
Liquid Lines Tie Point
Liquid Transfer Hose
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PRODUCT OUTLET / INLET
OPTIONAL PAD / RECOMPRESSED GAS LINE
SCRUBBER /DEPRESSURIZE /RECOMPRESSOR
Angle Valve Actuators Not Shown
Dual Liquid Valve With External Valve and Expansion Tank
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Expansion Tank Assembly with Rupture Disk and
Pressure Gauge
Fail Closed Automatic Valve
Dual Liquid Valves & External Valve with Expansion Tank
Click to edit Master title styleRailcar Enclosure Side View
Access Platform
Chlorine Scrubber
Click to edit Master title styleRailcar Enclosure Top View
Enclosure Gate
Open Top