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陽泉市精工特種儀表廠

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INFORMATION
壓力表應如何選擇及在安裝時的注意事項
2017-06-25

壓力表應根據鍋爐或受壓容器的工作壓力來選擇壓力表的精度等級。當鍋爐或受壓容器的1.作壓力小于2.5MPa時,壓力表的精度不應低于2.5級;工作壓力大于2.5MPa時,精度不應低于1.5級。也就是說,其介質的工作壓力越高,要求壓力表的精度越高。

壓力表在選擇表盤刻度范圍值時,一般在選擇表盤刻度值宜為介質工作壓力的1.5~2倍。如鍋爐蒸汽工作壓力為1.0MPa時,選擇壓力表值范圍宜在0~1.6MPa較為合適。用于鍋爐上安裝的壓力表表盤直徑應不小于100~150.

壓力表在安裝時應注意事項:

(1)壓力表在安裝前須經勞動局有關計量校驗部門進行校驗,合格者方能安裝。對已安裝的壓力表,應定期進行復驗。不允許私自拆除鉛封進行修理或超期使用未經校驗的壓力表。

(2)壓力表需安裝在便于觀察、易于沖洗的位置,應避免振動和高溫烘烤。壓力表安裝處應有足夠的照明。

(3)壓力表應安裝在鍋筒〔汽包)、分汽缸等蒸汽空間位置上,在管道上安裝應在直管段上。

(4)壓力表不允許直接安裝在鍋筒、分汽缸或管道上,應連接存水管(表彎)并在表彎與壓力表之間裝三通旋塞閥,然后再與設備或管道連接。表彎的作用是可積存蒸汽中的冷凝水,避免蒸汽直接進人彈簧管內,使其因過熱而失靈。三通旋塞閥可便于沖洗管路和更換壓力表用。

(5)當壓力表出現表針在無壓時不能恢復零位、表盤刻度模糊不清、保護玻璃破碎、表針被卡不動等情況時,應立即更換新表,避免出現誤指示而釀成大禍。

   

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