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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

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