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Pressure Vessels

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Pressure Vessels

Enersys has acquired thorough knowledge and experience in design and manufacturing of pressure vessels as per ASME Sec-VIII, Div-1 and all the related standards for materials and inspection. Our design engineers have prolonged experience to design various parts as per the rules of relevant standard. Enersys has own quality management system with standard procedures, sample forms and records formats in QC system and QC manuals besides the ones provided by ASME, which are only for WPS (Welding procedure specification) and PQR (Procedure qualification record), but not for other manufacturing activities.



Pressure vessels are used in a variety of applications for Oil & Gas, Petrochemicals, Refineries, Water Treatment Plants, Refrigeration Plants and other Chemical Industries. They appear in these sectors as industrial compressed air receivers, domestic hot water storage tanks, distillation towers, pressure reactors, autoclaves, pneumatic reservoirs, hydraulic reservoirs under pressure, storage vessels for liquefied gases, shells of heat exchangers, etc.

Enersys vessels are engineered with adequate safety factor, corrosion allowance, conservative design temperature and pressure. Necessary nondestructive testing, such as ultrasonic testing, radiography, and pressure tests (hydro or pneumatic) is carried out by experienced engineers.


Deaerators

A Deareators is used for the removal of air and other dissolved gases from the feed water to steam generating boilers. The dissolved oxygen in boiler feed water causes serious corrosion damage in steam systems by attaching to the walls of equipment and forming oxides (rust). It also combines with any dissolved carbon dioxide to form carbonic acid that causes further corrosion. Most Deareators are designed to remove oxygen down to levels of 7 ppb by weight (0.0005 cm³/L) or less.

Spray & Tray Type Deaerating Heaters

Spring-loaded nozzles located in the top of the unit spray the water into a steam atmosphere where the steam heats water and at the elevated temperature the solubility of oxygen is extremely low and most of the dissolved gases are removed from the system by venting. The spray will reduce the dissolved oxygen content to 20-50 ppb, while the scrubber or trays further reduce the oxygen content to approximately 7 ppb or less.

For optimum oxygen removal, the water in the storage section must be heated to within 3 º C of the temperature of the steam at saturation conditions. From inlet to outlet, the water is deaerated in less than 10 seconds.

A typical Deareators is shown in the figure. The spray head and trays made of stainless steel, but the upper pressure vessel it is made of epoxy-coated carbon steel. The storage vessel does not require such protection. Careful design of the nozzles minimize the vibration arising from the introduction of sparge steam during start-up and from the steam that flashes off from hot return condensate.

Design Features

  • Self-adjusting spring-loaded spray valves provide a uniform spray pattern over varying loads.
  • Increased spray distance ensures maximum heating and deaeration in the first stage.
  • Upward flow of steam counter to the downward flow of water provides final contact of the deaerated water with the purest and hottest steam.
  • Liberally sized equalizers pass flashing steam between heater and storage vessels under upset conditions.
  • Optimum space below the tray stack provides reduced steam velocities for even distribution.
  • All of these special design features combine to produce a deaerated feed water having a guaranteed oxygen content of 0.005 mL/L or less.

    Accessories

    Enersys furnishes nozzles / complete accessories for deaerating heaters, including:

  • Inlet and Overflow Control Valves
  • Level Controllers and Switches
  • Pressure Relief Valve
  • Vacuum Breakers
  • Pressure and Temperature Indicators
  • Gauge Glass Assemblies
  • Deaerator Support Stand
  • Platforms, Ladders and Supports
  • Special Instrumentation
  • Insulation Support