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The tank volume is about 750 US gal and the water is heated by 2 750 MBH input boilers.

I'm looking for sizing method for a temperature and pressure relief valve installed a domestic hot water storage tank. For normal operation, the pressure in the tank is about 80 psi and temperature is about 145F. Many thanks.

Is an eyewash station required for pot feeder which is for a simple water treatment for closed hydronic system? The chemical added to the pot feeder is toxic and could cause damage to eyes and skin but I feel the hazard is minimum.

sorry, my mistake. it's an old building and the drawings are not complete.

Sorry for the delay. I was occupied by something else. The thermostat of each fan controls a three-way mixing valve. Fan speed is controlled by the residents. This is an old system. There is no secondary pump. Circulation pump for heating and cooling is 428 GPM, 15 HP (one operation with one...

I mean the flow is relatively constant since there is temperature reset in winter. If the pump curve is flat, the flow rate will be relatively constant. In summer, when the pressure loss increases much more due to the 2-way control valves on the fan coils, the pump operating point may go left...

One of our retrofit project is an apartment. It has a 2-pipe fan coil system. There are 2-way control valve for each fan coil unit. In winter, the supply water temperature is reset depending on outdoor air temperature. In summer, the water temperature is constant and the control valve will...

Thanks, guys. The pumps are constant-speed secondary pumps. We are going to install VSD's on the pumps and want to make sure the minimum flow rate is 30% of total. The control valves are all two-way valves on each coil. The system is huge so most likely we'll have year round cooling load and...

We are going to install VSD's on some existing pumps for cooling. These pumps are all constant speed. Most of the loads have two-way control valve. To make sure there is a minimum 30% flow rate for VSD's, differential pressure control valves are needed. My question is whether we should install...