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| Seal weld
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Welding that is done to present a leak such as when a weld bead is laid where a pipe is screwed into a fitting. |
| Seal-off fitting
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Fitting which prevents gas leakage, etc. from moving from one section of conduit to another. |
| Sealant
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An elastomeric material used to fill and seal expansion and control joints. This material prevents the passage of moisture and allows the horizontal and lateral movement at the expansion and control joints. |
| Sealed combustion
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Sealing of combustion chamber to prevent spillage of combustion products. |
| Sealed combustion heating system
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A heating system that uses only outside air for combustion and vents combustion gases directly to the outdoors. These systems are less likely to backdraft and to negatively affect indoor air quality. |
| Sealer
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Coating which is used on a surface to close off pores so that penetration of liquid is prevented. There are different types of sealer for wood, masonry, asphalt, concrete, etc. |
| Seam
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A line, ridge, or groove formed from fitting, joining, or lapping two sections together. |
| Seam weld
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Welding done along the seam of joining or overlapping pieces. |
| Seamless pipe
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Pipe with no weld in the circumference. |
| Season
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To improve quality by aging, drying, etc. To cure. |
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