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Hi, why don't you check: IEC534-2-1 incompressible fluids IEC534-2-1 compressible fluids IEC534-2-3 flow capacity test procedures IEC534-2-4 flow capacities - inherent flow characteristics and range-ability cheers

Hello all, A double bloc and bleed valve as security to enter would not be acceptable. Complete isolation, of the concerning recipient, with blinds is the only secure and foolproof working practise. this is a safety standard and should be implemented in your procedures. cheers

Thank you davefitz, your advise and data will keep me occupied for a while ;-) I suppose now one has a handy spreadsheet on the subject?

Whit regards to superheater coil design I have two questions 1- What is the linear velocity of the steam through the tubes of a superheater coil and its relation to the linear velocity of the same steam through the in and outlet collectors. 2- What are the ratio limits wherein both velocities...

Epilogue Sorry guy's, embitterment should read embrittlement. raymond

Epilogue 505/04/2004 we received the report of the metallurgical examination which was carried out on our request on the dead end flange of the damaged SH outlet collector of the boiler. The conclusion of the report inputs the damage mainly to thermal fatigue and some intergranulare...

Thanks Quark, I must have overlooked that one. raymond

Steam inlet to the SH 195°C outlet 229°C Velocity at 3 ton/hour 4,4 m/sec; at 30 ton/hour 41,5 m/sec. Pressure differential at 3 ton/hour: 0,000 bar; at 30 ton/hour 0,035 bar Fleugas inlet 333 °C, outlet 248 °C raymond

Thank you Fzob, I will take this in consideration. I ‘m not aware of a contractor having the necessary tools to supply the service of pulling a vacuum. But I’ ve never asked.

take a look at http://www.convert-me.com/en/; http://www.ex.ac.uk/cimt/dictunit/dictunit.htm

Dear specialists A steam super heater consists of two identical collectors for in and outlet. Between both headers are a number of identical series of pipes. The inlet on the inlet collector is diagonal to the outlet on the outlet collector assuring the same distance between in and out for all...

I keep you guys posted tanks again! raymond

Thank you guys for all your professional advice. I think we all agree that the way of operation, low loads, many trips, with the consequence of temperature changes and maybe the effect of water treatment could lead to thermal or corrosion fatigue. Also that we have to wait for the metallurgical...

Unclesyd, I agree with you completely concerning the metallurgical examination. We are in the process of cutting the welding neck flange (opposite the outlet) for examination by one of our universities. This is the weld where the crack was in the weld, not on a border thick/thin; weld/pipe...

Onclesyd The outlet flange has the maximum mass flow while on the other hand the flange with the blind has the minimum mass flow, in fact zero. In operation the wall temperature of the outlet header will be different along its length maximum on the outlet flange, minimum on the blind flange. On...

Thank you Unclesyd The super heater starts to fill after every trip (maybe a 100 since august 2003). Even when the stop valve remains open due to the pressure dropping in the boiler consequently closure of the checkvelve. The water quality therefore is steam condensate. The boiler has a...

Thanks a lot metengr The SH tubes are welded to the surface of the collector ¦ The previous connection to the former collector was with a sockolet. These welds had the same problem in the same area (I don't understand wy this is explicitly in that area). But I agree the cause of both failures...

Same boiler other problem. After the problem with the nuisance trips due to high frequency radio signals and the vibration problem witch is still not really solved, our two pas, fire tube, 11barg, 30tons/hour, 235°C super heated HDS/Saacke steam boiler, for the a second time, has cracks in the...

Same boiler other problem. After the problem with the nuisance trips due to high frequency radio signals and the vibration problem witch is still not really solved, our two pas, fire tube, 11barg, 30tons/hour, super heated HDS/Saacke steam boiler, for the a second time, has cracks in the welds...

The vibrations starting point is near the jump over from negative to positive combustion chamber pressure. Still being slightly negative.