- Email: [email protected]
Supply tanks for sealing systems
Dynamic sealing flow control valve, flow tube, metering float, pressure gauge, c h e c k valve, and necessary pipe connections. T w o versions of Seal Gard are available. Seal Gard I is intended for use with any single Dura Seal as well as packed stuffing boxes. Seal Gard II has been designed to be used with a double or tandem Dura Seal or packed, "balanced" stuffing boxes; this version is equipped with dual flowmeters and two flow control valves. A key feature of the Seal Gard is its ability to control flows at low flush rates. A specially designed triangular port, incorporated into the flow control valve of the flow-meter, resists plugging even from larger-sized particulates that would readily block conventional needle-type flow control valves. The flow control valve is also designed to resist tampering with pre-established flow control settings. Another option available is a constant-flow regulator. This device provides the constant flow necessary for the operation of a Dura Seal in systems w h e r e variations can occur in the seal flush supply pressure or in the back pressure from the seal chamber. The Seal Gard, combined with these two optional features, provides total control of the sealing environment in a convenient, easy-to-instaU package. Seal Gard products are suited to applications in the pulp and paper industry as well as general industry, the chemical process industries, power, and non-API services in the petroleum industry.
Contact: D u r a m e t a l l i c C o r p o r a t i o n , 2100 F a c t o r y S t r e e t , K a l a m a z o o , MI 49001, USA. Tel: + 1 616 345 2744; Fax: + 1 616 381 8368.
B e l l o w s seal
designed for massproduced pumps A new seal has b e e n developed specifically for high volume, low to medium duty type pumps. The dimensionally compact Type 3, from John Crane Inc. is for use on centrifugal w a t e r pumps, well-jet pumps, swimming pool, spa and shower pumps, in addition to other domestic and industrial appliances w h e r e low cost and high reliability are of prime importance to the equipment manufacturers and users alike. O t h e r than two simple stainless steel drive bands, there are no metal c o m p o n e n t s and no springs in the seal design. A durable elastomer bellows is used which is designed to provide an even loading to the mating seal faces, eliminating the need for secondary seal O-rings and springs. The bellows design was developed using advanced c o m p u t e r techniques to optimise the seal performance and stress distribution within the bellows which have b e e n verified by performance testing. Low break-out torque is another significant benefit
Sealing Technology No. 2
of the Type 3 which gives improved performance and reliability from the fractional h o r s e p o w e r motors used to drive small pumps. The Type 3 is available in a wide range of metric shaft sizes from 10mm to 55mm and is suitable for temperatures from -20°C to + 100°C (-5°F to + 212°F). The maximum operating pressure is 10 bar g (145 psig) and the seal faces can be supplied in carbon/ceramic, carbon/silicon carbide or silicon carbide/silicon carbide combinations.
Contact: Ian Mather, J o h n Crane EMA, Crossbow House, 40 Liverpool Road, Slough, Berks SL1 4QX, UK. Tel: + 4 4 753 531122; Fax: + 4 4 753 573677.
Fugitive e m i s s i o n s
control package for valves TBV, a division of Victaulic Company, has developed a high-cycle fugitive emission control package for its line of tAto 6 in corrosion-resistant valves. The patented quarter-turn bellows seal provides zero leakage for processes involving hazardous air pollutants and volatile organic compounds as identified by the USA Clean Air Act. Its design utilizes a rotary-to-linear-to-rotary action for cost-effective 90 ° operation. The bellows operator is welded to the body of the valve to eliminate a potential leak path at the b o n n e t joint. The externally pressurized bellows assembly is also w e l d e d internally and backed by a secondary chevron containment seal, virtually eliminating stem leakage. The unit's low-torque design facilitates manual operation, and a standard mounting plate allows it to be automated with linear or 90 ° electrical and pneumatic actuators. Also available are an optional leak-off port and a locking device.
Contact: David Phillips, Sales Manager, TBV, 121 Flanders Road, P O B o x 1210, Westborough, MA 01581-6210, USA. Tel: + 1 508 898 0999; Fax: + 1 508 898 3743.
Supply tanks for sealing systems The provision of buffer fluid systems to maintain the integrity and optimum performance of p u m p seals is r e c o m m e n d e d by Durametallic UIC Their type 400 supply tank systems are suitable for double and tandem seals and operate as stand-alone
7
Dynamic sealing closed loop systems. They are ideally suited for critical installations to p r o t e c t against fugitive emissions from toxic chemicals or associated volatile organic compounds. Supply tanks are particularly suited for r e m o t e pumping operations w h e r e there may not be access to a piped w a t e r supply. They also eliminate the problems associated with fluctuating water supply pressures and avoid the cost of excess w a t e r usage w h e r e m e t e r e d supplies are provided. They can be used with a wide range of buffer fluids if water is not chemically compatible with the p u m p e d liquid. The limited fluid in a closed loop system minimises the danger of contamination or dilation of the process liquids in the vent of seal failure. The need to top-up tanks is also an early indication of seal failure necessitating maintenance or overhaul of the p u m p seal. Supply tanks from Durametallic are manufactured from heavy duty stainless steel and comply with ASME certification. They are tested hydrostatically up to 600 psig (41 bar) or pneumatically at 500 psig
(35 bar). Two sizes of supply tanks are available with capacities of 2.37 or 4.1 gallons (9 or 15.5 litres). They have an operating pressure of 400 psig (28 bar) in a temperature range of -29 ° to + 204°C. This is limited to + 66°C w h e r e an alternative aluminium tubular level gauge is fitted. Standard electrical supply c o m p o n e n t s are 120 V with other voltages being available. C o n t a c t : D u r a m e t a l l i c UK, U n i t 13B, U n i t e d Tradi n g Estate, O l d T r a f f o r d , M a n c h e s t e r M16 ORJ, UK. Tel: + 4 4 61 848 7061; Fax: + 4 4 61 872 6772.
Metal-c
ed
als
bridge the gap A range of metal-cased PTFE lip rotary seals available from Seal Consultants Ltd are claimed to bridge the gap b e t w e e n current technologies for use on rotating shaft equipment covering both gas and liquid sealing applications. The e c o n o m y of conventional rubber lip seals must be weighed against their limitations for applications involving extremes of temperature, speed or pressure, particularly w h e n combined with hostile operating conditions. However, the higher technology alternative is the more expensive and bulky mechanical face seal. The compact metal-cased PTFE lip rotary seals are not only economical, but they also offer impressive operating characteristics. T h e y can run at speeds of 30 m/sec, and cope with pressures up to 35 bar and temperatures from -20°C to + 250°C. They are resistant to chemical attack, have low friction characteristics and are designed to ensure long seal life even in conditions of no lubrication or w h e n used with abrasive media.
8
A wide range of design configurations can be supplied w h i c h includes single or multi-lip varieties with optical lip loadings, some with backing springs. Precision manufactured metal c o m p o n e n t s are supplied in a range of alloys and include stainless steel versions w h e r e necessary. The seals can also be supplied for contrarotating shaft applications, even incorporating threaded lip seals to make them particularly suitable for vacuum conditions or low pressure shaft sealing. C o n t a c t : S e a l i n g Consultants Ltd, 66 IAchfleld
Road, Pelsall, Walsall, West Midlands WS3 4IEL, UK. Tel: +44 922 692447/685159; Fax: +44 922 685168. I
I
Emission
¸Seal wins Vaaler award EG&G Sealol has w o n a Vaalar Award for the development of the Emission Containment Seal. The Vaaler awards are given annually by Chemical Processing magazine and have b e e n set up to recog,'xise achievements in the chemical process industries. Each development, submitted by the manufacturer, is intended to make operations in the chemical industry more costeffective, safer and productive. Contained in a simple cartridge design, the Emission Containment Seal (ECS) is a dry running bellows seal that backs-up the primary seal and contains fugitive emissions. Because it is dry-running, no l i q ~ lubrica, tion is necessary. As a result, the seal offers the process industry an improvement over expensive, high maintenance multiple seals that require a liquid barrier system. It also requires less axial space than typical multiple seal arrangements and is easy to install. C o n t a c t : EG&G Sealol Inc., 50 S h a r p e D r i v e , C r a n s t o n , R102920, USA. Tel: + 1 401 4 6 3 8700; Fax: + 1 401 463 6198.
[ I
Nato project
Tu
"1
IIII
~
I
[~
II
in
ey
An advanced ceramics and composites project sponsored by the Nato-Science Stabili~ Programme has b e e n completed with success in the Tubitak-Marmara Research Centre of Turkey. The project was launched in 1989, with the aim of introducing advanced ceramics technology to Turkish
Sealing Technolo~F No. 2
Contact: D u r a m e t a l l i c C o r p o r a t i o n , 2100 F a c t o r y S t r e e t , K a l a m a z o o , MI 49001, USA. Tel: + 1 616 345 2744; Fax: + 1 616 381 8368.
B e l l o w s seal
designed for massproduced pumps A new seal has b e e n developed specifically for high volume, low to medium duty type pumps. The dimensionally compact Type 3, from John Crane Inc. is for use on centrifugal w a t e r pumps, well-jet pumps, swimming pool, spa and shower pumps, in addition to other domestic and industrial appliances w h e r e low cost and high reliability are of prime importance to the equipment manufacturers and users alike. O t h e r than two simple stainless steel drive bands, there are no metal c o m p o n e n t s and no springs in the seal design. A durable elastomer bellows is used which is designed to provide an even loading to the mating seal faces, eliminating the need for secondary seal O-rings and springs. The bellows design was developed using advanced c o m p u t e r techniques to optimise the seal performance and stress distribution within the bellows which have b e e n verified by performance testing. Low break-out torque is another significant benefit
Sealing Technology No. 2
of the Type 3 which gives improved performance and reliability from the fractional h o r s e p o w e r motors used to drive small pumps. The Type 3 is available in a wide range of metric shaft sizes from 10mm to 55mm and is suitable for temperatures from -20°C to + 100°C (-5°F to + 212°F). The maximum operating pressure is 10 bar g (145 psig) and the seal faces can be supplied in carbon/ceramic, carbon/silicon carbide or silicon carbide/silicon carbide combinations.
Contact: Ian Mather, J o h n Crane EMA, Crossbow House, 40 Liverpool Road, Slough, Berks SL1 4QX, UK. Tel: + 4 4 753 531122; Fax: + 4 4 753 573677.
Fugitive e m i s s i o n s
control package for valves TBV, a division of Victaulic Company, has developed a high-cycle fugitive emission control package for its line of tAto 6 in corrosion-resistant valves. The patented quarter-turn bellows seal provides zero leakage for processes involving hazardous air pollutants and volatile organic compounds as identified by the USA Clean Air Act. Its design utilizes a rotary-to-linear-to-rotary action for cost-effective 90 ° operation. The bellows operator is welded to the body of the valve to eliminate a potential leak path at the b o n n e t joint. The externally pressurized bellows assembly is also w e l d e d internally and backed by a secondary chevron containment seal, virtually eliminating stem leakage. The unit's low-torque design facilitates manual operation, and a standard mounting plate allows it to be automated with linear or 90 ° electrical and pneumatic actuators. Also available are an optional leak-off port and a locking device.
Contact: David Phillips, Sales Manager, TBV, 121 Flanders Road, P O B o x 1210, Westborough, MA 01581-6210, USA. Tel: + 1 508 898 0999; Fax: + 1 508 898 3743.
Supply tanks for sealing systems The provision of buffer fluid systems to maintain the integrity and optimum performance of p u m p seals is r e c o m m e n d e d by Durametallic UIC Their type 400 supply tank systems are suitable for double and tandem seals and operate as stand-alone
7
Dynamic sealing closed loop systems. They are ideally suited for critical installations to p r o t e c t against fugitive emissions from toxic chemicals or associated volatile organic compounds. Supply tanks are particularly suited for r e m o t e pumping operations w h e r e there may not be access to a piped w a t e r supply. They also eliminate the problems associated with fluctuating water supply pressures and avoid the cost of excess w a t e r usage w h e r e m e t e r e d supplies are provided. They can be used with a wide range of buffer fluids if water is not chemically compatible with the p u m p e d liquid. The limited fluid in a closed loop system minimises the danger of contamination or dilation of the process liquids in the vent of seal failure. The need to top-up tanks is also an early indication of seal failure necessitating maintenance or overhaul of the p u m p seal. Supply tanks from Durametallic are manufactured from heavy duty stainless steel and comply with ASME certification. They are tested hydrostatically up to 600 psig (41 bar) or pneumatically at 500 psig
(35 bar). Two sizes of supply tanks are available with capacities of 2.37 or 4.1 gallons (9 or 15.5 litres). They have an operating pressure of 400 psig (28 bar) in a temperature range of -29 ° to + 204°C. This is limited to + 66°C w h e r e an alternative aluminium tubular level gauge is fitted. Standard electrical supply c o m p o n e n t s are 120 V with other voltages being available. C o n t a c t : D u r a m e t a l l i c UK, U n i t 13B, U n i t e d Tradi n g Estate, O l d T r a f f o r d , M a n c h e s t e r M16 ORJ, UK. Tel: + 4 4 61 848 7061; Fax: + 4 4 61 872 6772.
Metal-c
ed
als
bridge the gap A range of metal-cased PTFE lip rotary seals available from Seal Consultants Ltd are claimed to bridge the gap b e t w e e n current technologies for use on rotating shaft equipment covering both gas and liquid sealing applications. The e c o n o m y of conventional rubber lip seals must be weighed against their limitations for applications involving extremes of temperature, speed or pressure, particularly w h e n combined with hostile operating conditions. However, the higher technology alternative is the more expensive and bulky mechanical face seal. The compact metal-cased PTFE lip rotary seals are not only economical, but they also offer impressive operating characteristics. T h e y can run at speeds of 30 m/sec, and cope with pressures up to 35 bar and temperatures from -20°C to + 250°C. They are resistant to chemical attack, have low friction characteristics and are designed to ensure long seal life even in conditions of no lubrication or w h e n used with abrasive media.
8
A wide range of design configurations can be supplied w h i c h includes single or multi-lip varieties with optical lip loadings, some with backing springs. Precision manufactured metal c o m p o n e n t s are supplied in a range of alloys and include stainless steel versions w h e r e necessary. The seals can also be supplied for contrarotating shaft applications, even incorporating threaded lip seals to make them particularly suitable for vacuum conditions or low pressure shaft sealing. C o n t a c t : S e a l i n g Consultants Ltd, 66 IAchfleld
Road, Pelsall, Walsall, West Midlands WS3 4IEL, UK. Tel: +44 922 692447/685159; Fax: +44 922 685168. I
I
Emission
¸Seal wins Vaaler award EG&G Sealol has w o n a Vaalar Award for the development of the Emission Containment Seal. The Vaaler awards are given annually by Chemical Processing magazine and have b e e n set up to recog,'xise achievements in the chemical process industries. Each development, submitted by the manufacturer, is intended to make operations in the chemical industry more costeffective, safer and productive. Contained in a simple cartridge design, the Emission Containment Seal (ECS) is a dry running bellows seal that backs-up the primary seal and contains fugitive emissions. Because it is dry-running, no l i q ~ lubrica, tion is necessary. As a result, the seal offers the process industry an improvement over expensive, high maintenance multiple seals that require a liquid barrier system. It also requires less axial space than typical multiple seal arrangements and is easy to install. C o n t a c t : EG&G Sealol Inc., 50 S h a r p e D r i v e , C r a n s t o n , R102920, USA. Tel: + 1 401 4 6 3 8700; Fax: + 1 401 463 6198.
[ I
Nato project
Tu
"1
IIII
~
I
[~
II
in
ey
An advanced ceramics and composites project sponsored by the Nato-Science Stabili~ Programme has b e e n completed with success in the Tubitak-Marmara Research Centre of Turkey. The project was launched in 1989, with the aim of introducing advanced ceramics technology to Turkish
Sealing Technolo~F No. 2