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Dear all, Really sorry for the late reply, forgot that I posted this question actually! thanks for your queries. Just to clarify my statement "I am repairing a diverter damper", it's actually my friend's repairing the diverter damper, and he was the one actually asking the question I've asked...

Deaer boilerone, Thanks for your reply. I'm interested in your statement that the reason for the staggering "is for making sure that all tubes get welded to the tie bars". Why do we need the tubes to be welded to the tie bar? You are right about the design no longer used in recent boilers. The...

Dear all, I am repairing a diverter damper for my waste heat boiler (producing 13 ton/hr of steam at 44 barg drum pressure). 3 out of 6 bolts which are holding the diverter damper shaft to the diverter damper plate are broken, and I need to replace them. However, we don't have any as-built...

Ok got it. Thanks again for your help chicopee.

Thanks Mr168 & chicopee for your replies! If that is the case, then there's nothing wrong if we weld top and bottom of the same tubes throughout the length of the tie bar, apart from welding more than necessary? I am actually doing a repair of the tie bar, but the as-found condition is that in...

Dear all, I have a gas-fired water tube D-type package boiler, manufactured by Babcock & Wilcox. My boiler is a B&W FM model boiler. On the rear of the furnace, the tubes are flat-studded tubes, with refractory on the outside with inner hot casing and channel tie bar. The channel tie bar is...

Dear all, Hope you can clear my query. I am planning to purchase two gate valves used for steam service. I am not clear of the valve packing specification. The first gate valve (Gate valve A) is for steam service with max 51.1 barg, with temperature up to 300degC. The second gate valve (Gate...

Instead of side scan sonar inspection method, is there any inspection technology available in the market that can provide information on the pipeline profile (i.e. undulation, coordinate) resting at sea bed?

So your downstream pressure is higher than upstream pressure? I don't understand. Or is this a typo?

In my plant, we inject the amines in the boiler feed water line as others have mentioned. To be exact, the amines are injected in the piping downstream of deaerator and upstream of boiler feed water pumps. We inject it by using chemical metering pump.

Thanks davefitz for the reply. I'll check with my relief valve mfr then. Anyone has any idea for question 1, i.e why is the requirement of max reseat pressure removed from ASME I? Thanks.

Hi all, In ASME I 2004 PG-72.1, it's written that "After blowing down, all valves set at pressures of 375 psi (2.7 MPa) or greater shall close at a pressure not lower than 96% of their set pressure, except that all drum valves installed on a single boiler may be set to reseat at a pressure not...

It meets the 3% above set pressure criteria with ease. But yes, we're demanding the manufacturer to replace the safety valves to replace since it doesn't meet our requirement. I just wanted to double check if there is such thing as ASME VIII PSV in an ASME I boiler, because I have not heard of...

Thanks guys for your prompt replies. Just need some clarification: EdStainless: Really sorry, I don't understand your first sentence i.e touch a Co alloy like Stellite. Do you mean to say that stellite is great for erosion resistance? metengr: May I know what Cr-Mo steel you use in your...

Dear all, Can we install ASME VIII safety valves in an ASME I constructed power boiler? I'm commissioning an ASME I power boiler and our safety valve manufacturer have difficulty in achieving re-seat 4% below set pressure. The best we achieve so far is 7% below set pressure, and now the...

Dear all, I've recently serviced two desuperheater control valves (boiler feed water service) which were found passing, and the immediate cause was erosion at plug and seat. Currently we suspect that the erosion is accelerated by continuous small opening of the control valves, due to the...

Hi all. I noticed that boiler stacks in my plant have an inverted canopy design. But I have also seen boilers in other plants have the 'normal' canopy design. What is the basis of designing the canopy to be inverted? My canopies now experience corrosion which I highly suspect because of water...

yes chicopee, only use methane as our fuel gas.

Thanks all for your opinions. Appreciate it.

But during normal boiler operating load, my total feedwater input is just 0.2 - 0.5 ton/hour higher than my steam output...that's why I didn't consider tube leak. I only observed the condition i mentioned during startup...