Saturday, March 30, 2019

Welding Fire Protection Piping 101

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Fire protection piping has an easy life compared to other piping systems. Not much flowing through it. Only occasional pressure changes. Practically no temperature changes, so stresses due to expansion or contraction are not a concern. Fluid being carried is not explosive or flammable. About all it has to do is contain water reliably and provide it to sprinkler heads when it’s needed. It’s biggest enemy is corrosion.

Like welds in all piping systems, fire protection piping welds need to be adequate for the service. NFPA 13 does not require radiographic examination or other expensive inspection of piping system welds, but it does require that the shop fabricator and installing contractor have Welding Procedure Specifications (WPSs) that provide detailed direction to the welder on how to make the weld.
Part 1 – Welding Procedures and Welder Qualification for Fire Protection Piping
Part 2 – Examination of Fire Protection Piping during Fabrication and Installation
Figure 1: Harry’s Rod Burners, Inc. Welding Procedure Specification 
Figure 2: Procedure Qualification Record 
Figure 3: Welder Performance Qualification Record 
Figure 4: Undercut and reinforcement
Figure 5: Porosity, Slag and Arc strikes
Figure 6: Root Side Penetration
Figure 7: Root Side Incomplete Penetration
Figure 8: Acceptable Root Side Conditions
Figure 9: Pipe Butt Weld Made Using a Backing Ring 
Figure 10: Recommended Joint Fit-up without a Backing Ring 
Figure 11: Outlet Connection Welds 
Author Details
"Walter J. Sperko, P.E."
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