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By-Pass Type Odorizer

   

 By-pass Odorizer

Introduction

The By-Pass odorization of a gas flow (Evaporation Absorption) involve establishing a small side flow of gas, saturating the small stream with odorant vapor and returning it to the main stream.

Consideration must be given to the flow control of the small stream, the temperature of the saturating vessel, and the type of odorant used.  

Typical Application

This type of Odorizer used for Distributing Systems such as Pressure reducing gas stations with maximum capacity of   ۱۰,۰۰۰ SCMH                    

    Fig.1: By-Pass Odorizer

Principles of Operation

The evaporation-absorption     (By-pass) Odorizer consists of a tank equipped with one or more wicks located on a   by-pass gas line. The control for bypassing the gas through the tank is obtained by manually throttling a valve located on the main line.


          Fig.2: By-Pass Odorizer Operation

 Adjustment of the By-pass

 

 The By-pass flow adjustment depends on solubility of the odorizing agent in gas, on the gas pressure and temperature. Below

diagram shows the solubility of mercaptan in methane vs. operating pressure & temperature .                    

     Fig.3: Solubility Diagram

TYPE DESIGNATION

THBO ۲۵۰۰ – B- 60

Family    Flow Rate (SCMH)    Rating(Class)      Min.Press.

MATERIALS

Part  Name Material
Shell ASTM A516 GR.70
Heads ASTM A516 GR.70/ASTM A105
Legs ASTM A283 GR.C/St.37
Flanges ASTM A105
Pipes ASTM A106 GR.B
Wick ASTM A240-316L(KNITTED)
Stud Bolt& Nuts ASTM A193-B7/ASTM A194 2H
Name plate S.S.

TECHNICAL SPECIFICATIONS

Inlet pressure Pi: up to 300 Psig
Rating ۳۰۰#~۱۵۰#
Main Gas flow rate up to 10,000 SCMH
Operating temperature -۲۰ °c    to   + ۶۰ °c
Acceptable gases Natural Gas
Odorant Spec. MERCAPTAN(Sulfide Comp.)
Throttling device Orifice  R      ButterflyR
Design code ASME Sec VIIII-Div.1
Min. inlet/outlet gas temperature -۲۰°c /+50°c   

 

By-Pass Odorizer Installation and Maintenance Problems 

In By-Pass odorant selection consideration must be given to the type of odorant. If a mixture of compounds with different boiling points is used rather than a single compound, the odorant will fractionate in the saturating vessel and allow the higher boiling compounds to accumulate. For that reason the odorant selected for By-Pass type odorizer should have a narrow boiling range. Install odorizer on a flat surface. if possible, take care that in event of leakage the odorant agent cannot penetrate into the earth (through or similar device).The fixing holes in the feet should be anchor bolted. Due to the fact that odorizing rate depends on parameters like temperature, the unit should be protected locally against extreme temperature variations and outside corrosion.

 

 Install the unit as near the main gas line as possible; the shorter the piping, the less losses by internal resistance of piping and the more exact the proportional by-pass flow. Make sure that all valves keep closed Open butterfly valve in main gas line. Open valve in by-pass outlet , Open slowly valve in by-pass line inlet. wait a few seconds, until the Odorizer tank pressure is in equilibrium with the pressure in the main gas line. Open slowly valve “INLET”. Adjust now the throttle valve in the main gas line so that the desired amount of odorant flows through the by-pass.

 

 

 

Fig.4: By-Pass Odorizer Installation

 

Odorization Effectiveness

  The application of chromatographic equipment for analysis of minute concentrations of odoriferous sulfur-bearing compounds in combustible ducted at the American Institute of Gas Technology (I.G.T). It is the only method that allows individual chemical identification by instruments. 

 

Fig.5: Odorization Effectiveness

TOOS HENGAM ENGINEERING COMPANY

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