Torque Production Using Handwheels of Different Size During a Simulated Valve Operation Task

Schulze, Lawrence J. H.; Goldstein, David; Patel, Anupam; Stanton, E. L.; Woods, James E.

doi:10.1080/10803548.1997.11076368

Cited by 19 publications

(13 citation statements)

References 7 publications

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“…It is difficult to compare relative results from the present study with the Schulze et al (1997) Figure 5. Means of maximum torque normalized to chest height (n = 24).…”

Section: Valve Heightmentioning

confidence: 85%

“…In a study of 12 male NASA employees, Schulze et al (1997) found that the average maximum shear force exerted on a 40.6-cm (16-in.) hand wheel was 305 N, which is less than half of the 800-N force that Parks and Schulze (1998) measured in the field.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Schulze et al (1997) varied the valve hand wheel height at 81.3, 101.6, and 121.9 cm, which is approximately crotch, waist, and chest height. At crotch height (81.28 cm), participants exerted the greatest maximum torque (average of 39.7 N⋅m), greater than at waist (37.0 N⋅m) and at chest height (33.3 N⋅m).…”

Section: Valve Heightmentioning

confidence: 99%

“…• Were the sample sizes large enough (12 males in each study) and were the participants representative of industrial and utility workers? The average weight of the male participants in the Wood andSchulze (1999/2000) study was 82 kg and for the Schulze et al (1997) study was 87 kg. These average weights are less than the average weight of electricians who work in electric generating stations (102.2 kg), which is representative of many industrial workers (Sanchez & Marklin, 2008).…”

Section: Literature Reviewmentioning

confidence: 99%

“…In these situations, workers may have to assume awkward body postures to access the hand wheel and, furthermore, exert high torque to operate the valve. These awkward postures have a potential to result in musculoskeletal disorders (MSDs) to workers (Schulze, Stanton, Patel, & Maurizio, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Height of Industrial Hand Wheel Valves Affects Torque Exertion

2009

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“…It is difficult to compare relative results from the present study with the Schulze et al (1997) Figure 5. Means of maximum torque normalized to chest height (n = 24).…”

Section: Valve Heightmentioning

confidence: 85%

Section: Literature Reviewmentioning

confidence: 99%

Section: Valve Heightmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Height of Industrial Hand Wheel Valves Affects Torque Exertion

2009

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The effects of valve wheel size, operation position and in‐line pressures on required torque for gate valves

Parks¹,

Schulze

1998

Process Safety Progress

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Some of the hazards encountered by process plant operators involve the operation of in-line valves to control, start, and to stopflow. Torque required to operate valves may vary according to valve wheel size, in-line pressure, and valve flange position (open/closed). This study determined how valve wheel size, in-line pressure and valve position (open/closed) affect torque required to actuate a valve. Data were gathered with each combination of size, pressure and position for 336 valves in an operating petrochemical process facility. The results indicate that the main effects of valve wheel size, the in-line pressure, and open/closed valve position significantly affect operational torque requirements. I n addition, the interaction between position and pressure was significant for operational torque. The implication of these results is that operators are eqosed to operational torque requirements that exceed maximum acceptable capabilities that have been determined in previous studies. PROCESS OPERATOR INJURY TRENDSData searches were conducted for downstream facilities (refining and petrochemical) for Phillips Petroleum Com-

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Finger coordination during moment production on a mechanically fixed object

2004

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The moment production by several fingers on a mechanically fixed vertically oriented handle was studied under the systematic variations of task parameters such as (a) moment magnitude (1.0 Nm and 2.0 Nm) and (b) direction of moment production (into pronation and supination), as well as (c) vertical position of the handle from the moment axis, P (0, 2.0, 4.0, and 6.0 cm in both directions). The purpose of this study was twofold: to investigate the dependences between the task parameters and the performance variables and to test the mechanical advantage hypothesis. The performance variables changed symmetrically with P. In particular, magnitudes of the net horizontal and vertical forces both showed an S-shape change. The position of the point of zero free moment (PZFM) was determined. In the intermediate grasp locations (when 0< P magnitude

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Torque Production Using Handwheels of Different Size During a Simulated Valve Operation Task

Cited by 19 publications

References 7 publications

Height of Industrial Hand Wheel Valves Affects Torque Exertion

Height of Industrial Hand Wheel Valves Affects Torque Exertion

The effects of valve wheel size, operation position and in‐line pressures on required torque for gate valves

Finger coordination during moment production on a mechanically fixed object

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