in a fire sprinkler system, what is the maximum unsported arm over distance to a sprinkler head which has a maximum pressure of ______ at the sprinkler head is 85 psi and steel pipe is use
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windy city oil field, karamay, xinjiang, China
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Laying plastic pipes drainage to drain the water around the house of drainage system
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Concrete cube or construction brick and trowel. Construction concept and mason
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Joyful young man construction worker holding mobile phone and smiling while standing by the table with laptop
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