Maximum Allowable Stem Torque (MAST) - Piping

During valve operation, torque delivered by actuator (Pneumatic or electric) at any stage, should not exceed MAST value. If it happens stem may be subjected to mechanical failure. In some projects it has happened that MAST value calculated by valve vendor was higher than actual, even than it resulted in failure of stem.

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Technical information Maximum Allowable Stem Torque

2021-4-1  • For valves complying with API6D and SIL certified packages, the valve maximum torque must not exceed 50% of the MAST figures shown in Table B. • In accordance with API6DX / ISO 12490, the actuator maximum torque must not exceed the valve MAST.

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Technical information Valve torques - Habonim

2018-7-11  Before the actuator can be sized for any given valve application, the amount of torque required by the valve must be determined. The valve torque curves in this catalog show the breakout torque (BTO) requirements of Habonim ball valves as a function of valve size, seat material and differential pressure across the valve when the ball is in the closed position.

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How to solve valve mast issues Industry Update

2020-2-6  Process Duty like Shut Down and Blow Down valves will have an actuator with a torque output of at least 1.5 times the operational torque requirement of the valve (+150% or x 1.5 times)

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Actuator Selection - Flowserve

2020-1-2  The theory behind the 0.67 (or 67%) valve torque factor when sizing is based on the fact that published Flowserve valve torques are breakaway torques from the closed position, and spring ending or air ending torques. A spring-return actuator selected on this basis would probably be over-sized, since the valve torque is at maximum, and actuator torque is at minimum.

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Valve MAST: Its Relevance and Use in Valve Automation

2019-9-30  The MAST value is the maximum allowable stem torque, defined as the greatest torque to which a valve stem can be subjected to during operation without mechanical failure (Habonim 2017)....

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The importance of maximum allowable stem torque in

2019-4-9  There are six torque values associated with valves including ball valves [ 9 ]: 1. Break to open (BTO) This torque is measured when the valve is closed and the ball opens against just one seat under pressure. This torque, also called breakaway torque which is the largest torque in this case.

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VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART

2020-9-28  All value and actuator torque values published are theoretical, however where required we will torque test prior to despatch. The real valve torque value can be higher depending upon the following listed factors as these factors can drastically increase (or decrease) the torque.

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VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART

2017-2-14  Above Actuator is Complete with Bracket (ISO Mounting) and high tensile Adaptor All Torque Values are theoretical, however where required we will torque test prior to despatch. The real valve torque value can be higher depending upon the following listed factors as these factors can drastically increase (or decrease) the torque.

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The importance of maximum allowable stem torque in

The important point in the valve stem design is that the torque or force generated by the valve operator (actuator or gearbox) should not exceed the MAST at any point of

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Technical information Maximum Allowable Stem Torque

2021-4-1  • For valves complying with API6D and SIL certified packages, the valve maximum torque must not exceed 50% of the MAST figures shown in Table B. • In accordance with API6DX / ISO 12490, the actuator maximum torque must not exceed the valve MAST.

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Valve Torques And Actuator Torque Determination

Valve Torques And Actuator Torque Determination Information . EB-2001 Rev. G 6/2021 P a g e 2 of 44 It is the responsibility of the customer to determine the suitability of ASC Engineered Solutions products in their particular application. ASC Engineered Solutions shall not be liable for losses due to errors or omissions from use of this ...

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Valve Torques And Actuator Torque Determination

2021-1-18  How the valve will be operated, and how frequently also affect the actuator selection and torque. Infrequent operation will require higher torque values than for valves in modulating services, for example. O 2 cleaning may also increase the torque values for the valves. Service factors are provided at the end of this bulletin. For CRITICAL and ...

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how to calculate valve mast

2020-9-9  This is valve manufactures responsibility to calculate and provide valve MAST during engineering stage and ensure torque delivered by actuator is always less than the valve MAST. During offer stage valve MAST furnished in performance table shall be considered as basic value. During engineering stage ideally 3-4 weeks after PO, Valve manufacture ...

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Technical information Valve torques - Habonim

2018-7-11  pressure, the higher the BTO/ETC torque. Valve torques Actuator sizing Standard soft seat Metal seated (MTM) Cryogenic Trunnion. 5 Habonim valve torques Habonim valve torques Habonim pressure-torque curves Before the actuator can be sized for any given valve application, the amount of torque required by the valve must be determined.

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IMTEX corrosion and MAST (Maximum Allowable Stem

2020-6-17  This means that Camtorc Actuators, in contrast to conventional actuator solutions, do not risk damaging the valve by ‘overtorquing’ the stem. This solves a common problem experienced when sizing an actuator for a valve, particularly on MAST sensitive valves like butterfly valves and smaller bore ball valves.

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(PDF) Valve Stem Material Selection for Offshore Actuated ...

actuator size would reduce the actuator torque and solve the MAST issue. Conclusion and Recommendations The stem of the valve should have sufficient strength to withstand the loads from the

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BALON FLOATING BALL VALVE ACTUATOR TORQUE DATA

2018-12-7  Balon Floating Ball Valve Torques (inch pounds) BALON FLOATING BALL VALVE ACTUATOR TORQUE DATA Note: Values are raw torque values for new valves and standard seat materials. Values contain no service factors. Customer should determine appropriate service factors. Use the 285 psi. torque value for pressure differentials of 285 psi. below.

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how to calculate valve mast

Valve Actuator Torque Calculation Plumbing Equipment. ... Trends in pneumatic spring return valve actuator selection applications where there are valve MAST of valves actuators and ancillary... Know More. How a Forklift Works Sciencing.

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Valves and actuator torque abbreviations - Pipelines ...

2016-9-28  bto / rto / eto / btc / rtc / etc / mast Valves and actuator torque abbreviations - Pipelines, Piping and Fluid Mechanics engineering - Eng-Tips Engineering

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Technical information Maximum Allowable Stem Torque

2021-4-1  • For valves complying with API6D and SIL certified packages, the valve maximum torque must not exceed 50% of the MAST figures shown in Table B. • In accordance with API6DX / ISO 12490, the actuator maximum torque must not exceed the valve MAST.

Get Price

Technical information Valve torques - Habonim

2018-7-11  pressure, the higher the BTO/ETC torque. Valve torques Actuator sizing Standard soft seat Metal seated (MTM) Cryogenic Trunnion. 5 Habonim valve torques Habonim valve torques Habonim pressure-torque curves Before the actuator can be sized for any given valve application, the amount of torque required by the valve must be determined.

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Limitorque LPC - Flowserve

2020-1-2  actuator output torque and valve torque requirement shall be calculated at least in six points along the valve stroke. In addition, a final check is necessary to guarantee that actuator Maximum Output Torque does not exceed valve Maximum Allowable Stem Torque (MAST). The minimum set of parameters and features necessary for an

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IMTEX corrosion and MAST (Maximum Allowable Stem

2020-6-17  This means that Camtorc Actuators, in contrast to conventional actuator solutions, do not risk damaging the valve by ‘overtorquing’ the stem. This solves a common problem experienced when sizing an actuator for a valve, particularly on MAST sensitive valves like butterfly valves and smaller bore ball valves.

Get Price

Ball Valve Torques and Actuator Selection Information

2010-3-17  the valve torque is at maximum, and actuator torque is at minimum. The 0.70 factor reflects the maximum valve torque expected other than breakaway, and considers that the maximum output torque of the spring return rack and pinion actuator is at the start of the stroke. This would not apply to a scotch yoke or crank arm actuator, because the torque

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Actuator Selection Guide Technical Bulletin No. 1005

2018-10-1  establishing valve operating torque. Valve operating torque is determined by seating material, operation frequency, media type and line pressure. This guide provides a means of determining the valve operating torque based on these variables. The following steps are used to select the proper actuator

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Valves and actuator torque abbreviations - Pipelines ...

2016-9-28  bto / rto / eto / btc / rtc / etc / mast Valves and actuator torque abbreviations - Pipelines, Piping and Fluid Mechanics engineering - Eng-Tips Engineering

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how to calculate valve mast

Valve Actuator Torque Calculation Plumbing Equipment. ... Trends in pneumatic spring return valve actuator selection applications where there are valve MAST of valves actuators and ancillary... Know More. How a Forklift Works Sciencing.

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BALON FLOATING BALL VALVE ACTUATOR TORQUE DATA

2018-12-7  Balon Floating Ball Valve Torques (inch pounds) BALON FLOATING BALL VALVE ACTUATOR TORQUE DATA Note: Values are raw torque values for new valves and standard seat materials. Values contain no service factors. Customer should determine appropriate service factors. Use the 285 psi. torque value for pressure differentials of 285 psi. below.

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Actuators Actuation Valve Control LTD

Air Torque Pneumatic Actuator Aluminium Body SIL Atex Rack And Pinion. £119.00. (0 reviews) Hytork XL Pneumatic Actuator Yellow Aluminium Body Rack And Pinion. £370.00. (0 reviews) Koei Unic Electric Actuators Manual Override Enamel Coated Lightweight. £438.00. (0 reviews)

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