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Home Up Safety Regulatory Affairs Ammonia Library Contents Page Affiliations Information Request RMT Home Page

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NH3 Detectors
NH3 Storage Tanks
Aqua Storage Tanks
Urea Storage Tanks
Controls
Skid Packages
Vapor Recovery
Cylinder Manifolds
Valves & Assemblies
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VALVES & ASSEMBLIES

 

Safety Relief Valves

 

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They relieve pressures, liquid or vapor, that exceed the design pressure of a tank or piping system.

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They have a finite life span due to the rubber seat; expiration noted on valve.

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They are fitted with plastic caps to prevent contamination and as an indication that a valve has opened.

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They are mounted on a three-way valve manifold allowing one valve to be open and the other isolated.

 

Hydrostats

 

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They are installed on a piping system wherever liquid can get trapped in the line to release the liquid and prevent a hydrostatic eruption.

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If a hydrostat leaks, a second hydrostat can be threaded into the first one making it unnecessary to drain the line for replacement.

 

Tank Filling Valves

 

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They are the valves the vapor and liquid hoses are connected to when filling a storage tank.

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They are fitted with protective caps to prevent contamination and to identify ammonia liquid and vapor connections.  The liquid cap is orange and the vapor cap is yellow.  

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Vapor Connection:  Controls the delivery pressure differentials by transferring vapor from one tank to another.

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Liquid Connection:  Controls liquid withdrawal.

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A vent valve should be installed between the fill valve and the protective cap to relieve pressure before protective cap is removed.

 

Vent Valves

 

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They are installed to relieve pressure before a valve is opened.  

 

Excess Flow Valves

 

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They are connected to all piping and hose connections to prevent a massive release in the event of a catastrophic line break; NH3 only.

 

Pressure Gauges

 

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They measure the pressure inside a tank, usually a range of 0 - 400 psi. 

 

85% Outage Gauge

 

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They indicate when a tank reaches the 85% liquid level.  Trace vapors are released when liquid level is below 85%; A puff of white smoke is released when liquid level is at or above 85%.

 

Liquid Level Gauge

 

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Liquid level gauge reads the percent (%) of total tank capacity.  Capacity of tank (gallons) times the percent reading equals gallons.

 

Rotogauges

 

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They measure the liquid level of a tank.  You take the average of clockwise and counterclockwise readings.

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When the dip tube reaches below the liquid level a puff of white smoke appears.

 

Pressure Transmitter

 

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It transmits the pressure readings to the PLC to display on the screen for operators.

 

Level Transmitter

 

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It transmits the level readings to the PLC to display on screen for operators.

 

Temperature Transmitter

 

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It transmits the temperature readings to the PLC to display on screen for operators.

 

 

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