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Pulverized Coal Flow Measurement Testing Requiremetns

Pulverized Coal Flow Measurement Testing Requiremetns

Pulverized Coal Flow Measurement Testing Requiremetns

(OP)
I am an engineer at a fossil fired boiler power plant.  We are redesigning the coal nozzles for lower NOx.  The units in question are equipped with CE Raymond Bowl Mills (RB-533) and B&W MPS-67 Pulverizers.  We have hired a testing outfit to perform an isokinetic coal flow test on the coal piping risers after the mills.  I am not that familiar with the testing code that governs this and I don't have a vast PTC ot ASME library.  My questions:  

1. What are the upstream and downstream straight pipe requirements for the test ports?

2. Does a victaulic coupling qualify as a disturbance?

3. Is a gate valve wide open a significant disturbance?

Thanks.

RE: Pulverized Coal Flow Measurement Testing Requiremetns

refer to the following power test codes:
ASME PTC 4.2- pulverizers
PTC 38- fines measurement in gas streams

RE: Pulverized Coal Flow Measurement Testing Requiremetns

What type of gate valve?  A regular gate valve or a knife gate?

rmw

RE: Pulverized Coal Flow Measurement Testing Requiremetns

We usually use 20D or longer if it can be accomodated for the straight pipe requirements but I think the PTC might be less stringent.  We definitely wouldn't have any valves through that portion of pipe.

I2I

RE: Pulverized Coal Flow Measurement Testing Requiremetns

(OP)
A knife gate valve.  No valves are upstream of the test ports, however, some are immediately downstream.  (i.e. 2 to 3 D)  The only thing other than elbows are victaulic couplings.  Some pipes have a vic. coupling 2 to 3 D upstream from the ports.  We have anywhere from 7 to 10 diameters upstream from any elbow.

Thanks.

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