Indirect Water Bath Heaters

Indirect Water Bath Heaters

                    

   Indirect Water Bath Heater

( W.B.H. )

APPLICATION

When regulating of pressure events the gas temperature will cool approximately 7º F per 100 psig drop in pressure (or 1º F per 15 psig drop in

pressure). So we must prepare, adequate heating facilities to prevent regulator

freezing. It means that we must use a heat exchanger device are named        Water Bath Heater.

THECO delivery program includes Indirect Water Bath Heaters for many

different applications and duties using Water and Water-Glycol as heat transfer

media. THECO Bath Heaters are specifically designed to meet the precise

requirements of any process application and customer or regulatory

specifications such as API 12K and/or other national/international codes.

 

Principles of Operation

Bath Heaters consist of three basic components:

  • Fire Tube
  • Shell
  • Process/Flow Coil

The “U” Shaped fire tube is located in the lower half of the shell fully immersed in the water bath. Fuel gas is burned within the fire tube releasing heat through the wall of the fire tube to the water bath maintaining temperature up to 1900F (880C). The heated water bath then transfers heat through the tube wall to the fluid flowing through the process/flow coil or a series of tubes which are located in the upper half of the vessel. Typical fluids to be heated are well streams, oil, natural gas etc. The fire tube gas supply is controlled by a temperature controller in order to maintain the required bath temperature for the actual inlet and/or outlet conditions.

Heater Components


  • Shell
  • Fire Tube
  • Process Coil
  • Fuel Line & Instruments
  • Flame Arrestor
  • Skid & Ladder
  • Expansion Tank
  • Insulation

TECHNICAL SPECIFICATIONS

PI:UP TO 1400 psig INLET PRESSURE
600# CLASS RANGE
2500-100000 SCMH GAS FLOW RATE
-20 °C    TO   + 60 °C OPERATING TEMPERATURE
NATURAL GAS ACCEPTABLE GASES
70% OVERALL THERMAL EFFICIENCY
UP TO 25 PSI PRESSURE DROP
WATER+ETHYLENE GLYCOLE HEAT MEDIA
ASME SEC VIII-DIV.1-API 12K – IGS-PM-104 DESIGN CODE
88°C    MAX. BETH TEMPERATURE
+10°C    /+38°C    MIN.INLET/OUTLET TEMPERATURE
20  M/S MAX. GAS VELOCITY

  TYPE DESIGNATION

       THHHI  2500 -C- 420  –  6

Family

Min. Pressure
In/Out Size(inches)

 

 

Flow Rate (SCMH)    Pressure Class

DIMENSIONS AND WEIGHT

Weight(Kg) Overall Dimension(mm) Number Of

Burner/Type

In/Out

Size

Min. Heat Duty        ( Kcal/h) Gas Flow Rate (SCMH) Basic Model
L H D B A
880 2400 2500 750 4200 1285 1/TR6 2″ 42500 2500 THHHI-2C
1267 2750 3000 920 4585 1320 1/TR6 3″ 84000 5000 THHHI-3C
3175 3900 5200 1220 6000 1600 1/TR8 4″ 169000 10000 THHHI-4C
6466 4500 5500 1600 7000 2200 1/TR10 6″ 337000 20000 THHHI-6C
10446 5500 5500 1900 8100 2450 1/TR12 6″ 507000 30000 THHHI-6C
14310 6000 6400 2382 8570 3240 2/TR12 8″ 844000 50000 THHHI-8C
14800 6000 6400 2382 8580 3240 2/TR12 10″ 1010000 60000 THHHI-10C
21000 9370 5500 2820 11810 3580 2/TR16 10″ 1353000 80000 THHHI-10C
26000 12000 5500 2800 14730 3800 2/TR16 10″ 1691000 100000 THHHI-10C

MATERIALS

Material Part Name
ASTM A283-C SHELL
ASTM A106-Gr.B OR API5L-Gr.B SEAMLESS COIL
ASTM A53 FIRE TUBE
ASTM A283-C OR ASTM A53 EXPANSION TANK
ASTM A53 STACK
ALUMINUM + ALUMINUM CLADDING FLAME ARRESTOR
CAST IRON BURNER
FIBER GLASS INSULLATION
St37 WITH PAINT COATED CONTROL BOX
ASTM A283-C SADDLE
IPE-St 44 SKID
St. St. NAME PLATE

FEATURES:

DESIGN AND CONSTRUCTION ADVANTAGES

Standard Features 

  • Removable fire tube
  • Natural draft burner

Optional Features 

• Skid mounting
  • Spark arrestors
  • Thermostat
  • High efficiency burner system
  • Flame arrestors
  • Pilot guard safety shut down
  • Fuel shut down valve
  • Insulation
  • Primer (1 Coat) + Enamel Paint (2 Coats)
  • Removable flow coil
  • Fuel gas preheat coil
  • Fuel gas system c/w piping, filter, valves &

  Instruments

  • Fire tube stack
  • Alarm systems
  • Dual temperature control

Applications

  • Heating high pressure gas and/or oil in oilfield production
  • main gas distribution stations prior to pressure reduction to prevent hydrate formation
  • Heating highly viscous oils to reduce pumping pressures and to boost efficiency
  • Heat oil producing well streams

HEAT MEDIA

Freezing of water bath is a potential problem. If the heater is insulated, a continuous pilot suffices. Glycols are generally accepted as the safest and most trouble-free additives. THECO Glycol content table available on page 8 for several ambient temperatures.

Hydrate formation

Whenever natural gas is decompressed, its temperature goes down. This temperature change is called the “joule-Thompson effect”.

Figure below used for first approximations of hydrate formation conditions and for estimating permissible expansion of natural gas without the formation of hydrates.

         Professional in systems analysis         

                                                         P.O.Box : 91895-139

Tel/Fax :(+98 51) 36232501-4  

Web : www.theco.co.ir

E-mail : info@theco.co.ir

 

TH.E.CO

 

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