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PR Log - Global Press Release Distribution




              Operational Safety in Power Stations with new Molykote P37 Brush Top Tins

       Source: Project Sales Corp
       Dated: Apr. 14, 2013

       With a view towards the greatest possible operational safety, particularly high standards have to be met by
       the materials used in power stations. These also include lubricants, particularly those for bolted
       connections.

       MOLYKOTE ® P7 Thread Paste Sets New Standards

       With a view towards the greatest possible operational safety, particularly high standards have to be met by
       the materials used in power stations. These also include lubricants, particularly those for bolted
       connections.

       Bolted connections are in some cases exposed to extreme temperatures, which can reach up to 330°C in
       plants operated using nuclear power and up to 950°C in gas turbines. Such bolts must therefore be made of
       heat-resisting and high-temperature steels, for example nickel-based alloys, in order to guarantee adequate
       strength even at such high operating temperatures. The surfaces of these steels, as a rule, only develop a
       very thin oxide film. As a result, cold bonding tends to occur when the bolts are tightened or loosened, and
       so they must be protected with the help of a special lubricant to separate the surfaces. The coefficient of
       friction should be approx.0.12 to 0.14 order to permit the
       required uniform tightness of the bolted connections. This is particularly important with flanged
       connections in order to avoid leaks.

       Bolted connections have to be dismantled during regular power station inspections. This, however, is often
       not possible if an unsuitable lubricant has been used during assembly. The bolts, or studs, then have to be
       sawn off and the stubs drilled out of the blind hole. This work can take up a lot of precious
       time. Even greater problems can arise through bolt fractures, for these can lead to leaks at the connected
       components; these are notifiable accidents in nuclear power stations. Such fractures may be caused not only
       by metal fatigue but also by the thread lubricant. If, for example, a lubricant containing low melting point
       metals like lead, tin or zinc, is used the molten metal can defuse into the
       grain boundaries of the fastener alloy eventually leading to stress fracture. The suspicion exists that even
       traces of sulphur can cause corrosion on bolts in presence of water or vapour. Halogens, such as chloride or
       fluoride, can also lead to corrosion of the bolt which may cause fracture.

       For the reasons stated above SIEMENS, the power station construction company, stipulates that high
       temperature bolt lubricants for use in power stations must not contain lead, tin or zinc in their formulation.
       Any unavoidable contamination by these materials must not exceed 500 mg per kilogram
       of lubricant. In the past nickel based pastes were sometimes used in bolted connections exposed to high
       temperatures. Because of the carcinogenic effects of nickel powder, SIEMENS has removed these pastes
       from their list of approved products.

       In nuclear power stations bolted connections are in some cases exposed to radiation and as a result specific
       ingredients in the lubricant, for example antimony, can themselves be transformed into radioactive isotopes
       and begin to radiate. For this reason high temperature lubricants used for such applications should contain
       no elements, which can be activated at the reactor operation. For these reasons graphite lubricants have
       been used in the past mainly on screws exposed to water or vapour. However, due to the lubricating
       properties typical for graphite, problems occurred after extended exposure to high temperatures. Sometimes
       bolts could not be loosened and so had to be drilled out.


                                                          Page 1/3
PR Log - Global Press Release Distribution




In 1992 MOLYKOTE and SIEMENS agreed to a joint development programme to produce and approve a
high temperature thread lubricant for power stations which would overcome existing problems. Product
development would be in the hands of MOLYKOTE while SIEMENS took over the responsibility for
practical testing. The following were the bolt materials selected for testing as these alloys were considered
to be the most widely used in the industry.

• Nr. 1.7709 (21 CrMo NiV 57)
• Nr. 1.4913 (X19CrMoV Nb N III)
• Nr. 1.4986 (X8 Cr Ni Mo BNb 1616)
• Nr. 1.4952 (Ni Cr 20 Ti AI - Nimonic)

The breakaway torques were measured after high temperature exposure at 300, 600 and 850°C. Finally,
within the framework of a complete quantitative analysis, the percentage purity of the paste was
determined. After completion of
the very thorough practical tests MOLYKOTEP 37 high temperature thread paste, which had been
developed by this joint project, was approved by SIEMENS for all types of power stations, in accordance
with their TLV9600
02/02, for the lubrication of bolted connections in a dry atmosphere.
At about the same time SIEMENS discovered in the course of extensive autoclave tests that MOLYKOTE
P 37 was also suitable for threads which come into contact with water or steam. The new thread lubricant
meets fully the
requirements of power station manufacturers and operators. Its specification does not include any metals, or
sulphur, fluoride or chloride. Any contamination from raw materials is far below laid down limits. This
high degree of purity is achieved with the help of a special production plant which is solely used for this
one lubricant. As an additional safeguard, each production batch is inspected and tested for purity not only
on our own premises but also by an
independent institute. A purity certificate is enclosed with each delivery. Despite the importance attached to
purity, each batch is also checked for mechanical performance as a thread lubricant on a special bolt testing
machine before
release. To sum up, it can be said that the new MOLYKOTEP 37 thread paste makes an important
contribution to operational safety in power stations. Due to its ingredients which are non-reactive with bolt
alloys, together with its purity and
Carefully adjusted coefficient of friction, it protects against seizure of bolts and allows connections to be
dismantled easily, even after long periods at high temperature.

Technical advantages of MOLYKOTE P37
. Good lubrication properties in bolted connections
. Solid lubricants stable up to temperatures of 1400°C
. Contains no metals whatsoever
. Less than 200ppm of sulphur, chloride and fluoride
. Coefficient of friction within the range of oiled bolts
. Purity certificate enclosed

Also approved by GE, P&W, Westinghouse, BHEL, Rolls Royce, Mitsubishi Heavy Industries Ltd,
Daimler- Chrysler Aerospace, US Navy Ship Board Turbines, Nuovo Pignone, MTU, Electricity De
France, Thai
Petroleum Corporation Limited and many more power stations, refineries, and turbine and engine
manufacturers around the world.

Now available in imported brush top tins of 500 grams in India exclusively marketed by Project Sales


                                                    Page 2/3
PR Log - Global Press Release Distribution




Corporation, the importers and distributors for the complimentary product, Birkosit Turbine Sealing
Compound for turbine parting planes. The packaging of the thread paste in tins with brushes helps
to avoid contamination which could occur through brushes that have been used elsewhere.

Project Sales Corp, 28 Founta Plaza, Suryabagh, Visakhapatnam 530020, AP
Call +91-8912564393 Mob +91-98851-49412

--- End ---

Email              Click to contact author
Phone              919885149412
City/Town          Visakhapatnam
State/Province     Andhra Pradesh
Country            India
Industry           Power Generation, Oil Gas
Tags               molykote, P37
Link               http://prlog.org/12118156

                   Scan this QR Code with your SmartPhone to-
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Operational Safety in Power Stations with new Molykote P37 500g brush top tins from Project Sales Corp

  • 1. PR Log - Global Press Release Distribution Operational Safety in Power Stations with new Molykote P37 Brush Top Tins Source: Project Sales Corp Dated: Apr. 14, 2013 With a view towards the greatest possible operational safety, particularly high standards have to be met by the materials used in power stations. These also include lubricants, particularly those for bolted connections. MOLYKOTE ® P7 Thread Paste Sets New Standards With a view towards the greatest possible operational safety, particularly high standards have to be met by the materials used in power stations. These also include lubricants, particularly those for bolted connections. Bolted connections are in some cases exposed to extreme temperatures, which can reach up to 330°C in plants operated using nuclear power and up to 950°C in gas turbines. Such bolts must therefore be made of heat-resisting and high-temperature steels, for example nickel-based alloys, in order to guarantee adequate strength even at such high operating temperatures. The surfaces of these steels, as a rule, only develop a very thin oxide film. As a result, cold bonding tends to occur when the bolts are tightened or loosened, and so they must be protected with the help of a special lubricant to separate the surfaces. The coefficient of friction should be approx.0.12 to 0.14 order to permit the required uniform tightness of the bolted connections. This is particularly important with flanged connections in order to avoid leaks. Bolted connections have to be dismantled during regular power station inspections. This, however, is often not possible if an unsuitable lubricant has been used during assembly. The bolts, or studs, then have to be sawn off and the stubs drilled out of the blind hole. This work can take up a lot of precious time. Even greater problems can arise through bolt fractures, for these can lead to leaks at the connected components; these are notifiable accidents in nuclear power stations. Such fractures may be caused not only by metal fatigue but also by the thread lubricant. If, for example, a lubricant containing low melting point metals like lead, tin or zinc, is used the molten metal can defuse into the grain boundaries of the fastener alloy eventually leading to stress fracture. The suspicion exists that even traces of sulphur can cause corrosion on bolts in presence of water or vapour. Halogens, such as chloride or fluoride, can also lead to corrosion of the bolt which may cause fracture. For the reasons stated above SIEMENS, the power station construction company, stipulates that high temperature bolt lubricants for use in power stations must not contain lead, tin or zinc in their formulation. Any unavoidable contamination by these materials must not exceed 500 mg per kilogram of lubricant. In the past nickel based pastes were sometimes used in bolted connections exposed to high temperatures. Because of the carcinogenic effects of nickel powder, SIEMENS has removed these pastes from their list of approved products. In nuclear power stations bolted connections are in some cases exposed to radiation and as a result specific ingredients in the lubricant, for example antimony, can themselves be transformed into radioactive isotopes and begin to radiate. For this reason high temperature lubricants used for such applications should contain no elements, which can be activated at the reactor operation. For these reasons graphite lubricants have been used in the past mainly on screws exposed to water or vapour. However, due to the lubricating properties typical for graphite, problems occurred after extended exposure to high temperatures. Sometimes bolts could not be loosened and so had to be drilled out. Page 1/3
  • 2. PR Log - Global Press Release Distribution In 1992 MOLYKOTE and SIEMENS agreed to a joint development programme to produce and approve a high temperature thread lubricant for power stations which would overcome existing problems. Product development would be in the hands of MOLYKOTE while SIEMENS took over the responsibility for practical testing. The following were the bolt materials selected for testing as these alloys were considered to be the most widely used in the industry. • Nr. 1.7709 (21 CrMo NiV 57) • Nr. 1.4913 (X19CrMoV Nb N III) • Nr. 1.4986 (X8 Cr Ni Mo BNb 1616) • Nr. 1.4952 (Ni Cr 20 Ti AI - Nimonic) The breakaway torques were measured after high temperature exposure at 300, 600 and 850°C. Finally, within the framework of a complete quantitative analysis, the percentage purity of the paste was determined. After completion of the very thorough practical tests MOLYKOTEP 37 high temperature thread paste, which had been developed by this joint project, was approved by SIEMENS for all types of power stations, in accordance with their TLV9600 02/02, for the lubrication of bolted connections in a dry atmosphere. At about the same time SIEMENS discovered in the course of extensive autoclave tests that MOLYKOTE P 37 was also suitable for threads which come into contact with water or steam. The new thread lubricant meets fully the requirements of power station manufacturers and operators. Its specification does not include any metals, or sulphur, fluoride or chloride. Any contamination from raw materials is far below laid down limits. This high degree of purity is achieved with the help of a special production plant which is solely used for this one lubricant. As an additional safeguard, each production batch is inspected and tested for purity not only on our own premises but also by an independent institute. A purity certificate is enclosed with each delivery. Despite the importance attached to purity, each batch is also checked for mechanical performance as a thread lubricant on a special bolt testing machine before release. To sum up, it can be said that the new MOLYKOTEP 37 thread paste makes an important contribution to operational safety in power stations. Due to its ingredients which are non-reactive with bolt alloys, together with its purity and Carefully adjusted coefficient of friction, it protects against seizure of bolts and allows connections to be dismantled easily, even after long periods at high temperature. Technical advantages of MOLYKOTE P37 . Good lubrication properties in bolted connections . Solid lubricants stable up to temperatures of 1400°C . Contains no metals whatsoever . Less than 200ppm of sulphur, chloride and fluoride . Coefficient of friction within the range of oiled bolts . Purity certificate enclosed Also approved by GE, P&W, Westinghouse, BHEL, Rolls Royce, Mitsubishi Heavy Industries Ltd, Daimler- Chrysler Aerospace, US Navy Ship Board Turbines, Nuovo Pignone, MTU, Electricity De France, Thai Petroleum Corporation Limited and many more power stations, refineries, and turbine and engine manufacturers around the world. Now available in imported brush top tins of 500 grams in India exclusively marketed by Project Sales Page 2/3
  • 3. PR Log - Global Press Release Distribution Corporation, the importers and distributors for the complimentary product, Birkosit Turbine Sealing Compound for turbine parting planes. The packaging of the thread paste in tins with brushes helps to avoid contamination which could occur through brushes that have been used elsewhere. Project Sales Corp, 28 Founta Plaza, Suryabagh, Visakhapatnam 530020, AP Call +91-8912564393 Mob +91-98851-49412 --- End --- Email Click to contact author Phone 919885149412 City/Town Visakhapatnam State/Province Andhra Pradesh Country India Industry Power Generation, Oil Gas Tags molykote, P37 Link http://prlog.org/12118156 Scan this QR Code with your SmartPhone to- * Read this news online * Contact author * Bookmark or share online Page 3/3