OFD oil wiper ring. A technological leap in oil wiper rings brings increased oil savings and reliability

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1 OFD oil wiper ring A technological leap in oil wiper rings brings increased oil savings and reliability

2 New problems with increasing demands: It is time for a new oil wiper The OFD ring (Oil Film Dynamic) addresses previously unknown weaknesses of conventional oil wipers and ensures optimal wiping performance and reliability on high-speed compressors. Application However, conventional designs have To date, the lack of efficiency of decisive disadvantages: oil wiper rings on reciprocating Massive oil losses due to poor wiping compressors has not received a lot of performance attention. However the trend towards Wear of the piston rod and wiper rings compression at high speeds is forcing Short service life, low level of operators to give greater importance to reliability oil wiper ring performance. Oil wiper rings stop lubricating oil from leaking out of the crankcase by wiping oil off the piston rod, thereby preventing oil leaks. They are used in all common processes involving reciprocating compressors and are generally made of metal. These rings are not flexible and typically have a sharp edge that scrapes the oil off the piston rod (see Figure). Piston rod Sharp scraper edges Oil In terms of design and materials, the problems of conventional oil wiper rings can be attributed to the following factors: Inflexible wiper rings do not enclose the piston rod precisely Rigid design with sharp scraper edges Crankcase side Excessive oil flow into the wiper packing Oil pumping action into the distance piece due to missing axial spring loading Drainage

3 A revolutionary solution: Users confirm performance "There was "zero' leakage on the installed OFD wiper packings. They were installed two months ago and the OFD's have worked fantastic." Satisfied customer, natural gas industry "The best invention since sliced bread." Satisfied customer, oil industry "We are very happy with the spare parts and achieved 40 percent less oil consumption." Satisfied customer, chemical industry Application in a gas storage plant: Four installations with reciprocating compressors are operated unmanned by remote control. Initially, the OFD ring was installed on one compressor. After successful operation the remaining three systems have now also been fitted with OFD rings. Past problems: High oil leakage into the distance piece when using conventional wiper rings (piston rod diameter = 105 mm) Frequent unscheduled interventions by service personnel required to top up the oil Results obtained with the OFD oil wiper rings: Immediate reduction of oil losses The customer calculated a saving of around 1,000 liters of oil per year Cost savings through elimination of unscheduled servicing

4 New working principle, optimal oil wiping action HOERBIGER resolves the problems found in industry-standard solutions with a technological leap in oil wiper rings. The new solution Oil Film Dynamics The leap in technology achieved by the OFD wiper ring arises from a working principle that has not been used before in this field. This is achieved by using a special sealing ring shape and the use of polymers. Unlike current solutions, the OFD wiper ring makes the most of the benefits of the elasto-hydrodynamic effect: this refers to how the pressure in the lubrication gap between the elastic sealing ring and piston rod brings about the deformation of the ring; the deformation of the seal simultaneously changes the shape of the gap and thus the pressure distribution. (see Figure) The utilization of this elasto-hydrodynamic effect in conjunction with the associated wiper geometry has decisive advantages with regard to increasingly stringent requirements: Pressure and deformation of the lubrication gap Pressure TDC to BDC Ring deformation TDC to BDC Ring deformation BDC to TDC Pressure BDC to TDC Lubrication gap length There is no oil loss Wear is minimal, since the lubrication gap is retained during the entire work cycle Use of non-metallic material possible, since there is no sharp scraper edge required Between the top (TDC) and bottom dead center (BDC), (movement of the piston rod towards the crankcase side), the OFD ring floats on the oil film without wearing out the piston rod and/or generating an unwanted pumping action. At the bottom dead center, the ring is lowered onto the piston rod. The oil is gently wiped off the piston rod as it moves towards the head end side and is efficiently returned to the crankcase. Experience the revolutionary working principle! For more details:

5 The design of the OFD wiper ring enables outstanding performance The OFD oil wiping solution consists of a straight-cut insert ring (1) which is enclosed by a straight-cut L-shaped cover ring (2). An axially mounted spring plate (3) prevents lateral movement of the rings. They are compressed onto the piston rod by a garter spring (4). Gentle wiping action Rings made of extremely durable and flexible non-metallic material No damage to the piston rod Hydraulic edge works like a small oil pump 2 Simple retrofitting For piston rods up to 130 mm in diameter No restrictions with regard to manufacturer, packing design or piston rod finish 1 3 Highest reliability Two-piece design Gaps are covered and allow no leakage No unwanted pumping action into the distance piece thanks to axial spring loading Garter spring ensures perfect fit of the OFD ring on the piston rod 4

6 The advantages of the OFD oil wiper ring at a glance The design of the OFD ring incorporates HOERBIGER's expert knowledge on reciprocating compressors and is the result of substantial research work. Take advantage of our experience! REE Environmentally sound Reliable Efficient In-house testing and field experience demonstrate the advantages of the new OFD wiper ring: Optimal conformity between ring and rod and impressive wiping performance No oil leakage thanks to superior sealing efficiency and use of elasto-hydrodynamic effects Long service life of wiper rings and piston rod High reliability Did you know that all our new products are extensively tested on our own on-site test compressor? rpm Different compression ratios (e.g bar) Pressures up to 400 bar Fully controlled and monitored compression cycles Issue HOERBIGER Compression Technology is a business unit of HOERBIGER Holding AG, Zug, Switzerland. HOERBIGER is active throughout the world as a leading player in the fields of compression technology, automation technology and drive technology. In 2012, its 6,700 employees achieved sales of 1.06 billion Euro. The focal points of its business activities include key components and services for compressors, gas engines and turbomachinery, hydraulic systems and piezo technology for vehicles and machine tools, as well as components and systems for shift and clutch operations in vehicle drive trains of all kinds. Through innovations in attractive technological niche markets, the HOERBIGER Group sets standards and delivers cutting-edge solutions for the benefit of its customers. This product brochure contains product specifications based on research and development on the one hand and on manufacturing on the other. Dependent on place of installation, operating conditions and specifications, several parameters of the described product may change. Thus, HOERBIGER assumes no liability or warranty for the accuracy and completeness of the information covered in this brochure.

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