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New material added to asbestos-free range
ISSN 1350-4789
August 1994
An International Newsletter
Number 8
Sealing Technology
Contents Static sealing • • • • • • • • •
New material added to asbestos-free range Rubber seals for underground concrete casings Seals for large diameter pipes Clean sanitary gasket for biotechnology applications Profiled flange gasket for gas and water lines Teflon chemical process sampler improves safety Non-asbestos gasketing for high-temperature applications Material designed for high thermal-mechanical stresses O-rings for hot water and steam applications
Dynamic s~lng
4
• Sealing technology for high-cycling heat exchangers • Hydrodynamic gas seal for turbines ans compressors • Expanded graphited filaments for pumps and valve packings • Cartridge mounted seal with a quench • Lip seals outdated by new bearing guard
G e n e r a l news
7
• Packing gains Water Byelaws Scheme approval • Degussa strengthens its position in cyanuric chloride • Microflne Minerals to promote products for sealant market • Performance award for Huddersfleld Polymeric Products
T e c h n o l o g y insight
9
• Mechanical seals - fighting the failure modes Patents • Metal laminate gasket • Safety vaive, sealing ring and seal assembly
12
Viewpoint
14
New material added to a s b e s t o s - f r e e range A n e w asbestos-free gasket material (AFM), introduced by Reinz-Dichtungs GmbH, is said to feature a unique combination of physical properties. AFM 39 is so compressible that adequate sealing is assured even under low unit loads; in addition, the material provides high stress resistance coupled with good gas sealability. Another characteristic of the material is that it is physiologically neutral and does not contain any colour pigments. Potential application areas are fittings in the sanitary domain, gas units and heaters, lightweight c o m p o n e n t s and flanges, transmissions and pumps. AFM 39 has b e e n approved by DIN-DVGW and KTW. Contact: Reinz-Dictungs GmbH, Reinzstr~ 3-7, D-7910 N e u - U l m , G e r m a n y . Tel: + 49 731 70460; Fax: + 4 9 731 719089.
R u b b e r s e a l s for underground concrete casings
• Seal research and its impact o n design
Events calendar
EI~S E V I F~i?, ADVANCI-D
16
A n e w line of rubber seals for c o n c r e t e joints has been introduced by Yokohama Rubber Co Ltd. The seals are rubber plates that contractors can install on concrete casings for u n d e r g r o u n d utility lines, including electrical and telephone cables, water and gas mains, and sewage lines. Underground water leakage is a chronic problem with concrete structures, especiaUy w h e n the structures settle unevenly on soft ground or w h e n seismic tremors cause the foundations to shift.
TECI INOLOGY © 1 9 9 4 Elsevier Science Ltd., England./94/$7.00 per item
No part of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic, mechanical, photocopying,recording or otherwise, without the prior permission of the publishers. (Readers in the USA,please see special regulations listed on the back cover.)
August 1994
An International Newsletter
Number 8
Sealing Technology
Contents Static sealing • • • • • • • • •
New material added to asbestos-free range Rubber seals for underground concrete casings Seals for large diameter pipes Clean sanitary gasket for biotechnology applications Profiled flange gasket for gas and water lines Teflon chemical process sampler improves safety Non-asbestos gasketing for high-temperature applications Material designed for high thermal-mechanical stresses O-rings for hot water and steam applications
Dynamic s~lng
4
• Sealing technology for high-cycling heat exchangers • Hydrodynamic gas seal for turbines ans compressors • Expanded graphited filaments for pumps and valve packings • Cartridge mounted seal with a quench • Lip seals outdated by new bearing guard
G e n e r a l news
7
• Packing gains Water Byelaws Scheme approval • Degussa strengthens its position in cyanuric chloride • Microflne Minerals to promote products for sealant market • Performance award for Huddersfleld Polymeric Products
T e c h n o l o g y insight
9
• Mechanical seals - fighting the failure modes Patents • Metal laminate gasket • Safety vaive, sealing ring and seal assembly
12
Viewpoint
14
New material added to a s b e s t o s - f r e e range A n e w asbestos-free gasket material (AFM), introduced by Reinz-Dichtungs GmbH, is said to feature a unique combination of physical properties. AFM 39 is so compressible that adequate sealing is assured even under low unit loads; in addition, the material provides high stress resistance coupled with good gas sealability. Another characteristic of the material is that it is physiologically neutral and does not contain any colour pigments. Potential application areas are fittings in the sanitary domain, gas units and heaters, lightweight c o m p o n e n t s and flanges, transmissions and pumps. AFM 39 has b e e n approved by DIN-DVGW and KTW. Contact: Reinz-Dictungs GmbH, Reinzstr~ 3-7, D-7910 N e u - U l m , G e r m a n y . Tel: + 49 731 70460; Fax: + 4 9 731 719089.
R u b b e r s e a l s for underground concrete casings
• Seal research and its impact o n design
Events calendar
EI~S E V I F~i?, ADVANCI-D
16
A n e w line of rubber seals for c o n c r e t e joints has been introduced by Yokohama Rubber Co Ltd. The seals are rubber plates that contractors can install on concrete casings for u n d e r g r o u n d utility lines, including electrical and telephone cables, water and gas mains, and sewage lines. Underground water leakage is a chronic problem with concrete structures, especiaUy w h e n the structures settle unevenly on soft ground or w h e n seismic tremors cause the foundations to shift.
TECI INOLOGY © 1 9 9 4 Elsevier Science Ltd., England./94/$7.00 per item
No part of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic, mechanical, photocopying,recording or otherwise, without the prior permission of the publishers. (Readers in the USA,please see special regulations listed on the back cover.)