HEATPAC® EHS-71 Electric Heating System Designed for installation in oil systems, Alfa Laval HEATPAC® EHS-71 is an automatic electric heating system (EHS) that heats all types of mineral oils. ompact and lightweight, C it features specially designed heating lements that provide e high-efficiency heat transfer and gentle treatment. It also f eatures instant-response electronic emperature control with t an accuracy of ±1°C. This safeguards oil quality, thereby p reventing quality degradation. Application HEATPAC EHS-71 automatically heats all types of mineral oils, particularly high-density, high-viscosity fuel oils, sensitive lubricating oils and turbine oils, prior to centrifugal separation . It can, for instance, be used to heat oil before separation when steam production is low due to slow steaming. It can also be used for tank heating when tank design and operation requires storing fuels in tanks that do not have the possibility to be heated. Since the EHS-71 does not feature viscosity reading, it can neither be used as additional heater in booster systems, nor for separate viscosity control. Benefits • Compact and lightweight • Easy to install • Gentle treatment • No deterioration of heated oil • Automatic start-and-forget operation Standard configuration • HEATPAC EHM Heater, standard design The heater comprises rectangular die-cast aluminium h eating elements mounted on a flange to form a compact heating block, which is inserted in a pressure vessel made of mild steel. A baffle plate inside the pressure vessel divides the flow into two passes. The oil inlet a

o pposite each other on the same level, enabling i nstallation in a series. The terminal box housing at the top of the heater is s eparated from the hot pressure vessel to maintain a low temperature in the box. The hot side of the p ressure vessel is adequately insulated with 25-mm mineral wool wrapped in aluminium sheet. • HEATPAC power unit Housed in a robust cabinet, the unit feeds electric power to the heater. It is regulated by an external EHS-71 controller. • EHS-71 control unit The control unit is equipped with a HMI panel and a programmable logic conroller (PLC). The system is t operated...

Working principle The fuel or lubricating oil is continuously fed to the HEATPAC heater. A signal from the PT-100 temperature sensor at the oil outlet is transmitted to the EHS-71 controller, which regulates the amount of electric power to the heating elements. Heat is transferred to the oil through the corrugated aluminium surface (shown right). The EHS-71 control unit and power unit are specially designed to supply power incrementally and to prevent any interference with other shipboard electric and electronic equipment. A unique characteristic of the cast aluminium heating elements is the...

* Not approved for use with lubricating oil. Alfa Laval reserves the right to change specifications without prior notification. How to contact Alfa Laval Up-to-date Alfa Laval contact details for all countries are always available on our website at www.alfalaval.com Alfa Laval is a trademark registered and owned by Alfa Laval Corporate AB. HEATPAC is a trademark owned by Alfa Laval Corporate AB. MDD00271EN 1604