NO. The pressure vessel explodes. Every article ever written describes the pressure vessel explosion.
NO. The SPR protects the pressure vessel.
The code was based on the assumption that a plain end could only be modified by a qualified contractor who could solder a copper plug on the end. It was assumed a qualified contractor would NOT do such a thing, and therefore, the system was protected from such tampering.
However, the reality of today is that a plain end does NOT prevent tampering by the common man. With the invention of push-on fittings (Sharkbite, etc), available at any hardware store, it is now EXTREMELY
easy for the common man to plug the system and create an unsafe environment for occupants and property.
Zero. The drain line presents no protection against tampering, plugging, and incorrect piping. The 1993 ASME standard, and most codes, are now woefully inadequate. Whether it’s plain end or NPT threads, both invite tampering by the common man.
Yes, but the alternative is the tank exploding. Much like an air bag deploying, there is potential for damage, but you live to tell about it.
The SPR is NOT a valve, nor does it violate any code language. The SPR is a full bore (>3/4”) device that simply connects the relief valve and the drain line. The SPR is very similar to a Hose Bib Vacuum Breaker. The HBVB is a unique device that protects a water system from hose threads tampering, just like an SPR protects a pressure
vessel system from tampering with the NPT threads.
The SPR has a lifetime warranty. It will outlast the T&P valve and the water heater. However, when the T&P valve is changed, or the water heater is replaced, a new SPR will be needed. |
