Valves may be rotated as far as the horizontal position with no great decrease in maintenance convenience. But should not be installed with the stem downward since the bonnet acts as a trap for acrasive sediment and water wich may freeze under extreme climatic conditions.
Safety (operation & maintenance ) requires that valves be placed over platforms, rather than adjacent to them. Valves can be placed over access area if they comply with horizontal stem limitations and area bove 2100 min head clearance.
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| Valve operating clearance |
Ergonomical requirements for minimum clearance of passage ways are illustrated in the following picture.
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| Passage ways - Minimum Clearance |
PERSONNEL CLEARANCE WORKING SPACE:
Ergonomical Requirements for the personnel clearance for working space is illustrated in the following figure.
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| Personnel Clearance work space |
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| Valve Installation Guide |
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