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...
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?
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...
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...
Hi all. Appreciate your help to check whether my assumption is correct.
I have a water-tube gas-fired boiler, producing 40tons/hour of steam at 40 barg, 385 degC. During boiler startup, I noticed that there is water that is drained from the economizer. Sometimes the amount looks a lot until I...
Dear all,
Appreciate your advice. My HRSG boiler has drum baffle plates made of SS400. The HRSG is designed according to ASME Sec I. When I refer to ASME Sec I, under PG-6 Plate, SS400 is not listed as one of the materials. My question is, am I violating the code when I use that material as my...
Dear all,
Need your opinion. I'm in a project of constructing a new HRSG, 35tph @ 385 deg C and 40 barg. Our boiler vendor recommended the steam drum level controller not to be compensated with pressure. As far as I know, all my other boilers' steam drum have their level controllers...
Hi guys.
I'm doing a superheater assembly replacement for my gas-fired power boiler. When the superheater assembly arrived at site, I found that there are traces of rust all over the superheater header. I've been advised to apply high-temp painting on the superheater header. Is it a normal...
Hi everyone. I'm working on evaporator tubes replacement for my package boiler. During removal of a tube stub from the steam drum, we accidentally damaged the tubesheet while grinding off the tube stub. We used a small grinder to grind off the tube stub because we don't have a tube cutter, and...
