- Email: [email protected]
New UV-curable compound introduced by Master Bond
NEWS
Readers respond to Editor’s comment Courses & Events on loose-fill packing news item Seminar on fastening technology In our September issue a news item appeared on page 1 describing a new injectable packing from Burgmann Industries GmbH. I commented that my admittedly rather out-of-date experience of such packing was not entirely positive. Burgmann has provided the following response, which includes some further clarification on methods of application: Stefan Obser, Burgmann’s Director of International Sales & Operation in Wolfratshausen, Germany says: ‘The Editor has obviously unhappy memories of earlier injectable packing systems. The latest generation are all based on PTFE fiber materials, and as such have much less susceptibility to stick to the stuffing box or spindle surface. Additionally, we recommend that a top and bottom header ring of braided packing is used in conjunction with the injectable packing. This provides a retaining support, and also allows extraction of the packing to be easier by screwing the extractor into the bottom ring and withdrawing the injectable packing along with it. It should also be remembered that the extraction of the packing is a rare occurrence, since this packing system uses a ‘top-up’ process with the injector gun whenever maintenance is required.’
Another reader, whose experience is also some years old, commented: ‘A previous company that I worked for was promoting loose fill unsuccessfully for two years, when they hired me for the promotion of that ‘wonderful’ product. I could only state that I considered that there was something wrong with it. In fact there is some contradiction, as one of the problems with seals is extrusion. How can you avoid extrusion with loose product? Alternatively it hardens out, or you use a back-up ring. I had, like you, a negative experience with loose packing. The positive point is that I had the opportunity to have a quite good understanding of the functioning of a stuffing box, including the building of a test rig for the purpose. That experience is about 15 years old, and it is possible that solutions have now been developed.’ Thank you both for your contributions. I think that combining the comments summarizes the situation quite well. There is still some issue with removal, but this is overcome by using a ring of braided packing. However, modern materials do make removal much easier. The issue of extrusion is also addressed by use of conventional packing rings. The system still offers a benefit of topping up the packing without intervention, which is a considerable ‘plus’ in many applications. Bob Flitney, Editor
New UV-curable compound introduced by Master Bond Master Bond UV15-7TK1A is a new one-component, highviscosity, optically clear, UVcurable system developed by US-based Master Bond Inc for bonding, sealing and coating applications. Curing is achieved by exposure to UV light of an appropriate wavelength and with adequate intensity, with typical cure times ranging from 5 or 10 seconds up to 1 or 2 minutes at ambient temperatures.
Sealing Technology January 2005
The material is designed to be non-yellowing and chemically resistant, with good electrical insulation properties and low shrinkage on curing. It is fully reactive, and does not contain any solvents or other volatiles. Contact: Master Bond Inc, 154 Hobart Street, Hackensack, NJ 07601-3922, USA. Tel: +1 201 343 8983, Fax: +1 201 343 2132, Email: [email protected], Web: www.masterbond.com
& bolted joint design This two-day seminar, to be held in New York on 20–21 January, was developed to give engineers and other technical personnel up-to-date specifications and a better understanding of the complexity of mechanical joining with fasteners. The topics to be covered include: • Understanding the bolted/screwed joint, elastic interactions and the need for preload stress. • Selecting proper tightening methods. • Calculating safety factors and limitations. • Selecting the optimal fasteners for the design. • Evaluating dissimilar materials for thermal expansion and galvanic properties.
Continued demand for fluid sealing course Continuing high demand for specialized training in fluid sealing technology meant that the latest training course at BHRSolutions was significantly oversubscribed. Another course will be run on 15–16 March. Previous participants from fluid power, aerospace, automotive, oil & gas, valve and pump manufacturers, white goods, medical device and chemical process companies as well as suppliers of sealing systems have all benefited from the ‘hands-on design’ format of the course. The next course, specifically on elastomer and plastic seals, will be held at Cranfield on 15 March, followed by an optional half-day on gaskets on 16 March.
Series of seminars to be held on pipeline integrity A series of one-day seminars are to be held in the UK during 2005 covering the subject of pipeline integrity, organized by ABB Engineering Services in association with the Health and Safety Executive. Presenters will include ABB pipeline specialists, HSE inspectors, bolted joint specialists as well as pipeline reliability and integrity engineers from major oil and gas companies. Seminars are planned for: • • • •
1 February in Leeds. 13 April in Manchester. 22 June in Cardiff. 27 September in Aberdeen.
Pump users symposium includes range of seal topics The Texas A&M International Pump Users’ Symposium and short course, from 28 February to 3 March, contains a familiar range of activities concerning seals for pumps. The main technical lectures include one on water injection pump seals and another on bearing seals. There is a tutorial on mechanical seal material selection and, in addition to the regular mechanical seal discussion group, there is also one on seal user/manufacturer alliances. A course on mechanical seal design, operation and trouble-shooting will be held twice during the event. Contact details for all of these meetings are given in the Events Calendar, on page 15.
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Readers respond to Editor’s comment Courses & Events on loose-fill packing news item Seminar on fastening technology In our September issue a news item appeared on page 1 describing a new injectable packing from Burgmann Industries GmbH. I commented that my admittedly rather out-of-date experience of such packing was not entirely positive. Burgmann has provided the following response, which includes some further clarification on methods of application: Stefan Obser, Burgmann’s Director of International Sales & Operation in Wolfratshausen, Germany says: ‘The Editor has obviously unhappy memories of earlier injectable packing systems. The latest generation are all based on PTFE fiber materials, and as such have much less susceptibility to stick to the stuffing box or spindle surface. Additionally, we recommend that a top and bottom header ring of braided packing is used in conjunction with the injectable packing. This provides a retaining support, and also allows extraction of the packing to be easier by screwing the extractor into the bottom ring and withdrawing the injectable packing along with it. It should also be remembered that the extraction of the packing is a rare occurrence, since this packing system uses a ‘top-up’ process with the injector gun whenever maintenance is required.’
Another reader, whose experience is also some years old, commented: ‘A previous company that I worked for was promoting loose fill unsuccessfully for two years, when they hired me for the promotion of that ‘wonderful’ product. I could only state that I considered that there was something wrong with it. In fact there is some contradiction, as one of the problems with seals is extrusion. How can you avoid extrusion with loose product? Alternatively it hardens out, or you use a back-up ring. I had, like you, a negative experience with loose packing. The positive point is that I had the opportunity to have a quite good understanding of the functioning of a stuffing box, including the building of a test rig for the purpose. That experience is about 15 years old, and it is possible that solutions have now been developed.’ Thank you both for your contributions. I think that combining the comments summarizes the situation quite well. There is still some issue with removal, but this is overcome by using a ring of braided packing. However, modern materials do make removal much easier. The issue of extrusion is also addressed by use of conventional packing rings. The system still offers a benefit of topping up the packing without intervention, which is a considerable ‘plus’ in many applications. Bob Flitney, Editor
New UV-curable compound introduced by Master Bond Master Bond UV15-7TK1A is a new one-component, highviscosity, optically clear, UVcurable system developed by US-based Master Bond Inc for bonding, sealing and coating applications. Curing is achieved by exposure to UV light of an appropriate wavelength and with adequate intensity, with typical cure times ranging from 5 or 10 seconds up to 1 or 2 minutes at ambient temperatures.
Sealing Technology January 2005
The material is designed to be non-yellowing and chemically resistant, with good electrical insulation properties and low shrinkage on curing. It is fully reactive, and does not contain any solvents or other volatiles. Contact: Master Bond Inc, 154 Hobart Street, Hackensack, NJ 07601-3922, USA. Tel: +1 201 343 8983, Fax: +1 201 343 2132, Email: [email protected], Web: www.masterbond.com
& bolted joint design This two-day seminar, to be held in New York on 20–21 January, was developed to give engineers and other technical personnel up-to-date specifications and a better understanding of the complexity of mechanical joining with fasteners. The topics to be covered include: • Understanding the bolted/screwed joint, elastic interactions and the need for preload stress. • Selecting proper tightening methods. • Calculating safety factors and limitations. • Selecting the optimal fasteners for the design. • Evaluating dissimilar materials for thermal expansion and galvanic properties.
Continued demand for fluid sealing course Continuing high demand for specialized training in fluid sealing technology meant that the latest training course at BHRSolutions was significantly oversubscribed. Another course will be run on 15–16 March. Previous participants from fluid power, aerospace, automotive, oil & gas, valve and pump manufacturers, white goods, medical device and chemical process companies as well as suppliers of sealing systems have all benefited from the ‘hands-on design’ format of the course. The next course, specifically on elastomer and plastic seals, will be held at Cranfield on 15 March, followed by an optional half-day on gaskets on 16 March.
Series of seminars to be held on pipeline integrity A series of one-day seminars are to be held in the UK during 2005 covering the subject of pipeline integrity, organized by ABB Engineering Services in association with the Health and Safety Executive. Presenters will include ABB pipeline specialists, HSE inspectors, bolted joint specialists as well as pipeline reliability and integrity engineers from major oil and gas companies. Seminars are planned for: • • • •
1 February in Leeds. 13 April in Manchester. 22 June in Cardiff. 27 September in Aberdeen.
Pump users symposium includes range of seal topics The Texas A&M International Pump Users’ Symposium and short course, from 28 February to 3 March, contains a familiar range of activities concerning seals for pumps. The main technical lectures include one on water injection pump seals and another on bearing seals. There is a tutorial on mechanical seal material selection and, in addition to the regular mechanical seal discussion group, there is also one on seal user/manufacturer alliances. A course on mechanical seal design, operation and trouble-shooting will be held twice during the event. Contact details for all of these meetings are given in the Events Calendar, on page 15.
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