A Long Experience in Energy Equipment and one Goal: The Customer s satisfaction. Heating Equipment and System

A Long Experience in Energy Equipment and one Goal: The Customer s satisfaction. Heating Equipment and System

VALVITALIA SpA, Valvitalia Systems Division is a successful Company that for a hundred years has been dedicating its activity to the design and production of Natural Gas Treatment Equipment for industrial, civil and power generation applications, offering a wide range of products to give a high degree of customisation and an extremely high standard of quality and service. The company s attainment of prestigious certifications underlines a level of overall quality unmatched in the sector: not just extremely high standards of quality and service, but research and innovation in terms of technological and management expertise. A complete range of gas heater is part of Valvitalia Systems Division production: Water/ Steam Heat exchanger Gas Heater Electric Heater Oil Diathermic Heater Performance Heater Valvitalia Systems Division activities includes: developing, design, manufacturing and supplying of gas heater with vertical and horizontal configuration; design codes: ASME Sec. VIII; BS AD Mehrblatt U Stamped PED Others upon request 2

Shell and tubes Heat Exchanger Heat exchangers are designed for heating natural gas, air, propane and other non aggressive gases. They are designed to compensate the Joule-Thompson effect during a gas expansion, in order to avoid the hydrates formation potentially dangerous in gas treatment and reduction station. The working principle is based on heat exchange by conduction between the heating fluid (hot water or steam) and the gas to be expanded. Heat exchangers guarantee a wide exchange surface in order to keep high thermal efficiency. Design advantages Standard design units are available for a wide range of temperatures, pressures and flow rates Customised features upon customer request Wide range of materials Heating fluids: hot water and steam Low Pressure Loss Large surface for high thermal efficiency Low Maintenance costs No floating parts are inside the equipment, which will avoid malfunctions and maintenance costs. Features Maximum working temperature: up to 300 C Gas nozzle connection: from ANSI 150 up to ANSI 900 Water/steam nozzle connection: PN16, ANSI 150,ANSI 300 Power rating: from 7.000 kcal/h up to 5.000.000 kcal/h Low cost internal inspection: with the inspectable model it is possible to check and verify the internalsection of the vessel with a low service cost. 3

Why an indirect Heater It is to be found in an economic justification. The fluid carrying coils are operated at a maximum pressure of 3,000 psi. (depending on the customer requirements), whereas the shell of the indirect heater containing the heat transfer medium (water) is operated usually at atmospheric pressure, or at a very little pressure above it, therefore it s required a thin wall vessel for the heater shell. In addition, also the firetube needs withstand only the atmospheric pressure plus a few pounds. It would be prohibitive from several standpoints to attempt to make firetube to withstand the pressure of 3,000 psi as well as the heater shell itself; thus the creation of the indirect type heater with fluid carrying high pressure coils immersed in an atmospheric pressure water bath heated by a firetube operating close to the atmospheric pressure. Gas Heater What is an indirect Heater An indirect heater is an oilfield terminology for a vessel complete with: a firetube (which is usually fired by natural gas), a fluid around the firetube (which is usually water) and, immersed in the fluid, a coil containing the fluid to be heated. The water bath around the firetube is heated directly by having contact with the firetube and the coil containing the fluid to be heated is immersed in this hot water bath. Because there is an intermediate step of heat transfer between firetube and coil, the heater derives its oilfield terminology of indirect heater. Use of the indirect Heater Normally the natural gas is produced at high pressures ranging from 1,500 psi up to 3,000 psi and it s usually transferred to sale gas lines that operate at 1,200 psi and below. The indirect heater is often employed to supply heat to a gas stream that is being expanded from some elevated pressure (well head) to some intermediate pressure (intermediate production equipment) or to the actual sale line pressure. Heat supplied is used to compensate for the Joule-Thompson effect of the gas through expansion. 4

A most frequent application The high pressure fluid is introduced to the heating unit through a choke located at the heater inlet, and the expansion takes place immediately inside the heater in the water bath. Then, as the fluid passes through the steel coils, it s raised to the desired outlet temperature suitable to compensate the Joule-Thompson effect during the expansion. The steel coil, which is subject to the well head operating pressure, is subject further to corrosion by the fluid carried within the steel pipe as well as erosion caused by the high velocity of the fluid itself. In time the combination of corrosion and erosion takes its toll in wall thickness of steel pipe. Features Available Removable Firetube Removable Tube bundle Large firetube combustion volume per square foot of firetube area Quality fabrication X-ray and stress relieving facilities Automatic control, regulation and safety systems suitable to operate also without electric power. High Performance and High Efficiency Designed and manufactured in accordance to: API 12 K ASME VIII 5

Electric Heater In all the cases in which it's required a quick heating and eletric power is available, an electric heater is a mandatory choice. Oil Diathermic Heater The diathermic oil systems use a diathermic fluid as carrier for heat transfer. The main characteristic of a diathermic oil (mineral or synthetic) is the high boiling temperature (more than 350 C) at standard atmospheric pressure: then it is possible to reach high temperatures without using high pressure values. Performance Heater Gas Fuel Performance Heater consists of two stacked shell and tube heat exchangers in series. The heat exchangers are single pass fixed tubesheet type, and include expansion bellows on the shell. A growing number of combined-cycle power plants are incorporating performance heater as a means of improving overal efficency. The Heater improves gas turbine efficency by reducing the amount of fuel needed to achieve desired firing temperature (generally inthe range of 185 C). For fuel heating to be a viable method of performance enhancement, feedwater has to be extracted from the heat recovery steam generator at an optimum location. Boiler feedwater leaving the intermediate pressure economizer is commonly used. Using gas fired, oil-fired, or electric heaters for performance gas fuel heating will not result in a power plant thermal efficency improvement. 6

Heat exchanger on skid Gas Heater ready for shipment 3-way valve Water boilers Spare Parts TGT Quality is completed by the after sale assistance and a complete organisation which focus its own activity on care, technical support and spare part requests of the customer. For further information please contact the SERVICE DEPARTMENT: Tel. +39 049 9199653 - Fax +39 049 9125455 - E-mail: service.vsd@valvitalia.com 7

A Long Experience in Energy Equipment and one Goal: The Customer s satisfaction. Padova Plant. VALVITALIA S.p.A. - Systems Division Via Campolongo, 97-35020 Due Carrare (PD) - Italy Phone: +39.049.9199611 - Fax: +39.049.9125455 E-mail: info.systems@valvitalia.com Web site: www.valvitalia.com 05.10-300 - VSD-HEATING-EQUIP.03