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davefitz... The manufacturer has reviewed the setpoint change and said the internals do NOT have to be changed. His only recommendation was to change the non-return valve to a gate with a wafer check to prevent "slapping" during low loads. The downstream piping was increased to accommodate the...

We have a 50,000 #/hr boiler with MAWP of 300 psi and operated since installation @ 200 psi. Over the last 10 years, the demand has decreased to between 10-25,000 #/hr (seasonal). Mechanical modifications have been made to the system and boiler to drop the pressure to 50 psig (none to the fuel...

Thanks bimr. This is a run of the mill safety relief like a Kunkle or similar, not a Maxon. There is no standard at the facility. I was considering whether I needed bubble tight shutoff (Buna N) or integrity in the event of fire (metal seats). I was being a bit lazy not going through all the...

I need to replace a 3/4 x 1" safety valve on a natural gas main that has a missing label. The only question I have is what the seat material should be. Metal, Buna, Viton? Is there a standard dictating this?

I have a significant buildup of magnetite in a central heating system with several miles of pipe at a site in GA. As you can expect, we have HX's plugging constantly. The system supplies both heating in the winter and domestic hot water year round. Pipe size ranges from 16" leaving the...

My question is regarding alkalinity. I'm operating a boiler at 200 psig. The boiler application is for Central plant hot water heating by direct steam injection using a cascade heater (similar in operation to a dearator). As such, I have 100% condensate return using the high temp hot water as...

The problem with capillary lines is they tend to plug easily. No system is clean unless you're using glass lined pipe.

I would install an isolation manifold just before the xmtr. I do this as a general practice and have used these on boiler steam applications and 500 degF Dowtherm heat transfer fluid flow xmtrs where operators periodically blow down the impulse lines to remove trash. The manifold works well...

Is it a pit, crack or general erosion? Where is the location of the hole? middle of the tube or at the tube sheet? Can you tell the direction of corrosion, process to water or water to process? Cutting the tube in half at the hole may reveal something. Is it a helical coil in the HX...

Mister E2 Thanks for the input. Unfortunately, I have to go through the exercise to prove the exercise is pointless. I've done a little digging since and have found some articles that reduce the effort down to a "plug and chug" formula but even with that, it's not all that simple. Besides the...

The only way pressure can increase due to temperature in a closed loop is if there is no expansion tank (or expansion tank is "solid") and there are no leaks. If you have some leaks, pressure would then be determined by your makeup source. The only thing I would add to Compositepro's post is...

R-410a acts as a solvent on HT surfaces having a cleaning effect on the surfaces. Typically on a bare or finned surface, You use a zero fouling factor. Refrigerant is removed from the oil with sump heaters in a oil recovery system.

Thanks IR. It's time I give you more of the story. The intent in lowering the hot water temperature is to lower the energy consumption at federal facilities that is mandated by the government. However, I want to make sure money saved isn't spent elsewhere to compensate for the issues...

"rusty, musty file"... You can't imagine the half of it. I came from private industry and let's just say it's an eye opener how the government spends money. It's not just quantity, it's how money is budgeted and how it's delegated to be spent. Enough politics! We do have the energy audits...

The thinking is if we lower the temperature, the less heat loss we'll have. As I briefly mentioned in the initial post, the heat exchangers will be too small and will either have to be replaced or some other supplemental means of boosting the temp will be required or vary the temperature up and...

Thanks MJ. I wish it were that simple. The practicality of finding the pipe underground and getting the temperature and flow isn't there.

I've been tasked with determining the savings of reducing the temperature of an underground hot water system from 230 to 180 degF at a military base. The average temperature drop on the return through the day is about 30 degF. I know the size and cumulative lengths of pipe throughout the...

You'll probably have to go to a mechanical means of water separation if you're using saturated steam to drive the turbine. Proper line trapping and/or a knockout pot before the turbine would be helpful. I'm assuming this is a rather samll turbine vs. a power plant turbine. If not, then you...

Thanks everyone for their input. Special thanks to SceneryDriver for posting those links.... very helpful.

Hope you can help out an old gear head asking a questin that has probably been asked numerous times. I'm installing VFDs on a boiler Over Fire Air fan (60 HP) and a Forced Draft fan (125 HP). If line reactors are installed on the VFD and using VFD cable, do I still need gounding rings for the...