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...
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...
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...
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...
My background is with operation and maintenance of utility systems in the chemmical processing industry, primarily oil and Nat Gas fired with some waste fuels, mostly positive pressure boilers. I've recently changed jobs acting as a contractor managing the operation of a wood fired boiler...
We are in the initial stages of converting from #6 oil to #2 as a backup to NG in a 165 MMBTU process heater. To answer those of you that wonder why we are giving up our "#6 grandfather". Suffice it to say we tired of fighting the fouling from junk that's in today's #6 oil to the point where...
I have a hot oil heater currently running at my max permitted heat input of 165 MMBTU/HR. The production process has fully opened opened all of their users due to fouling issues. Yes, we're aware that they need to clean thier heat exchangers but, we're trying to make it to a scheduled shutdown...
I recently started at a large chemical company after 20 years at smaller chemical plants as a utility engineer.
Several years ago, this plant retrofitted a boiler with a low NOx burner using only Natural gas as a fuel. During the modification, the manufacturer recommended a boiler shutdown at...
