Marcin: /* Tue Dec 24, 2019 */

2019-12-26T02:04:00Z

Tue Dec 24, 2019

← Older revision		Revision as of 02:04, 26 December 2019
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	=Tue Dec 24, 2019=		=Tue Dec 24, 2019=
	*1" PEX pipe ~~blew~~ right at the stove outlet a year ago from running the stove without the circulating pump. The pressure relief did not activate, as the pressure relief was after the PEX pipe, and temperature did not rise much at the pressure relief.		*1" PEX pipe ruptured right at the stove outlet a year ago from running the stove without the circulating pump in a cleaning operation. The pressure relief did not activate, as the pressure relief was after the PEX pipe, and temperature did not rise much at the pressure relief.
	*This is a failure mode that needs to be eliminated by design, such as by using metal pipe and a hot water storage tank on the outlet - though this does not address the inlet side. Another buffer tank would need to added at the inlet side. Or, a warning light could be added to notify that the circulating pump is not running.		*This is a failure mode that needs to be eliminated by design, such as by using metal pipe and a hot water storage tank on the outlet - though this does not address the inlet side. Another buffer tank would need to added at the inlet side.
			*To address the condition where the stove is running without the circulator pump, defusing the heat safely - would be adding a large hot water storage buffer tank. Such a storage buffer would have to be sized so that the heat from any full, hot-burning load could be trapped solely in the volume of the buffer tank. This assumes one load only - as the operator would notice that no house heating is occurring in this fault condition, and the operator would likely not put in another load without correcting the situation.
			*Or, a warning light could be added to notify that the circulating pump is not running.
	*Automation controls should have a lockout for running the stove without the circulator pump.		*Automation controls should have a lockout for running the stove without the circulator pump.
	*Most redundant control would be a pressure relief valve added to the entrance side and the exit side.		*Most redundant control would be a pressure relief valve added to the entrance side and the exit side.
	*Current design has the pressure relief after the PEX. The pressure relief should be right on the stove on a metal pipe connection, before any PEX.		*Current design has the pressure relief after the PEX. The pressure relief should be right on the stove on a metal pipe connection, before any PEX.
			*Using PEX is a good safety feature, as any extreme overpressure condition that is not caught by the T/pressure relief valve - ruptures the PEX without causing a life-threatening overpressure condition.
			*'''Outstanding question: is a thermostatic mixing valve desirable on a tankless hydronic stove system? What are the advantages for using such in a house heating application with a wood burning stove?'''

Marcin: Created page with "=Tue Dec 24, 2019= *1" PEX pipe blew right at the stove outlet a year ago from running the stove without the circulating pump. The pressure relief did not activate, as the pre..."

2019-12-26T01:54:44Z

Created page with "=Tue Dec 24, 2019= *1" PEX pipe blew right at the stove outlet a year ago from running the stove without the circulating pump. The pressure relief did not activate, as the pre..."

New page

=Tue Dec 24, 2019=
*1" PEX pipe blew right at the stove outlet a year ago from running the stove without the circulating pump. The pressure relief did not activate, as the pressure relief was after the PEX pipe, and temperature did not rise much at the pressure relief.
*This is a failure mode that needs to be eliminated by design, such as by using metal pipe and a hot water storage tank on the outlet - though this does not address the inlet side. Another buffer tank would need to added at the inlet side. Or, a warning light could be added to notify that the circulating pump is not running.
*Automation controls should have a lockout for running the stove without the circulator pump.
*Most redundant control would be a pressure relief valve added to the entrance side and the exit side.
*Current design has the pressure relief after the PEX. The pressure relief should be right on the stove on a metal pipe connection, before any PEX.

Hydronic Stove Log - Revision history

Marcin: /* Tue Dec 24, 2019 */

Marcin: Created page with "=Tue Dec 24, 2019= *1" PEX pipe blew right at the stove outlet a year ago from running the stove without the circulating pump. The pressure relief did not activate, as the pre..."