"Just recently, three of our biogas plants in Riedlingen and Laupheim were equipped with Lewa OD7 and OD60 type odorization systems," explains Karl-Heinz Brunner from the service team at Erdgas Südwest-Munderkingen. In this project quantity-proportional, gas flow controlled odorization systems were equipped with a diaphragm pump type MAH with solenoid actuator. A solenoid valve was built into the pressure line to prevent a backflow of odorant, which is often the consequence of very small stroke frequencies of less than ten pulses per minute.
Furthermore, the system is extremely precise: At a gas pressure at the injection point of six to twelve bar, at most 20 milligrams of odorant per rated cubic meter are added per hour. "The micro-flow meter KMM 1 also measures small volume flows at an error range of ± 1 percent, so the odorant is metered safely, proportionally, and economically," assures Walter Richter, odorization product manager at LEWA.