Furnace manufacturers will typically assemble their safety shut off valves, pressure switches, and all the manual components required by FM or whoever is dectating the burner safety system requirements into a "gas rack" that is mounted near or on the furnace. It can be a complicated maze of...
HiLevel (Electrical)
22 Aug 13 11:04
I posted this in the codes and standards forum and I'm "reposting" it here. I apologize if this is bad practice; however, it seemed that most discussions around natural gas are in this forum.
I have a gas rack located a distance away from an enclosed duct...
Well, I hate to follow up on my own post; however, I just blew $400 on AGA XF0277 "publication".
Based upon this publication it looks to me like we need to shut down every gas fired steam heating system in the country without explosionproof equipment and wiring. How can companies like Honeywell...
I posted this in the codes and standards forum and I'm "reposting" it here. I apologize if this is bad practice; however, it seemed that most discussions around electrical area classification are in this forum.
I have a gas rack located a distance away from an enclosed duct burner. It's a...
Thanks Stookeyfpe,
I found the following reference to NFPA 54 in an ancient thread on the EE forum. I don't know that you can call a burner a gas mixing machine.. maybe.
7.12.5.2 Electrical Requirements. Where gas-mixing machines are installed in well-ventilated areas, the type of electrical...
Stookeyfpe,
I was a little worried about where you were headed with that flammable gas in the bathroom analogy.
I agree with all you said, and I've poured over NFPA 497 Chapter 5. However, I have never found a standard specific to natural gas piping typical of low pressure burner gas racks...
Thanks for the reference to the similar issue; however, it was for a pipe passing through another building. I'm talking about a burner gas rack that has your typical valving and screwed connections. And, by the way, the NG pressure is only 5psig; I see no allowance mentioned for gas pressure...
I have a gas rack located a distance away from an enclosed duct burner. It's a typical gas rack with <5 psig natural gas. The design engineer has classified the area around the gas rack as Class I Group D Division 2. And, the result is a big change order and delay from the gas rack manufacturer...
Ref: thread242-135230
I rountinely encounter the situation in chemical plants, where we are installing an instrument on a vessel that will contain a Class I Div.1 environment and the surrounding environment is Class I Div.2. The assumption is that the vessel contains the Div 1 environment...
I'm not a very good source of detailed info on corrosion I'm afraid. I know we're using just carbon steel piping and storage tanks. I did talk to some turbine flow meter guys about some things I'd heard about corrosion or build up on the turbines. Looks like the Daniels folks recommend teflon...
JMW,
This is very interesting. I'm mostly specialty chemical background; so, this is all new to me.
Our product is 99+% dry ethanol. So, the density is constant and the thermal expansion is well established at .00063/F. I expect that the buyer of the ethanol will have a dryness spec that the...
BigInch,
I've learned more about the custody transfer, and in Trinidad, they apparently use manual readings via tape on the storage tank before and after transfers for custody transfer purposes. They use flow meters for loading trucks; however for tankers, they use manual tank measurements. They...
I've gotten a lot of good input and gathered a lot of additional information over the internet and from various gauging and flow meter vendors. I believe I'll propose a "belt and suspenders" approach. I'll put a gauge well and a basic float level transmitter on this floating roof tank. Intent...
