Codes for Power Applications

What Standards Apply?

B16.34

API 6A &D

B16.34 Annex ANOMIAL

PIPE SIZE "d" FP RP STD "d" FP RP STD "d" FP RP STD "d" FP RP STD

150 150 150 150 300 300 300 300 600 600 600 600 900 900 900 9000.5 0.50 0.625 0.625 0.625 0.50 0.625 0.625 0.625 0.50 0.625 0.625 0.625 0.50 0.625 ** 0.625

0.75 0.75 0.625 0.625 0.625 0.75 0.625 0.625 0.625 0.75 0.625 0.625 0.625 0.69 0.625 ** 0.6251 1.00 1.0625 0.625 0.625 1.00 1.0625 0.625 0.625 1.00 1.0625 0.625 0.625 0.87 0.625 0.625 0.625

1.25 ** ** ** 0.625 1.25 ** ** 0.625 1.25 ** ** 0.625 1.12 1.0625 0.625 0.6251.5 1.50 1.50 1.0625 0.625 1.50 1.50 1.0625 0.625 1.50 1.50 1.0625 0.625 1.37 1.0625 0.625 0.6252 2.00 2.125 1.50 1.0625 2.00 2.125 1.50 1.0625 2.00 2.125 1.50 1.0625 1.87 1.50 1.0625 1.0625

2.5 2.50 ** ** 1.0625 2.50 ** ** 1.0625 2.50 ** ** 1.0625 2.25 2.125 1.50 1.06253 3.00 3.0625 2.125 ** 3.00 3.0625 2.125 ** 3.00 3.0625 2.125 ** 2.87 2.125 1.50 1.504 4.00 4.0625 3.0625 ** 4.00 4.0625 3.0625 ** 4.00 4.0625 3.0625 ** 3.87 3.50 2.125 1.505 5.00 5.125 ** ** 5.00 5.125 ** ** 5.00 5.125 ** ** 4.75 3.50 ** **6 6.00 6.0625 4.0625 ** 6.00 6.0625 4.0625 ** 6.00 6.0625 4.0625 ** 5.75 5.125 3.50 **8 8.00 8.0625 5.125 ** 8.00 8.0625 6.0625 ** 7.87 8.0625 6.0625 ** 7.50 7.125 5.125 **10 10.00 10.063 7.125 ** 10.00 10.063 8.0625 ** 9.75 10.063 8.0625 ** 9.37 8.0625 7.125 **12 12.00 12.063 8.0625 ** 12.00 12.063 10.063 ** 11.75 12.063 10.063 ** 11.12 10.063 8.0625 **14 13.25 12.063 10.063 ** 13.25 12.063 10.063 ** 12.87 12.063 10.063 ** 12.25 12.063 8.0625 **16 15.25 15.25 10.063 ** 15.25 15.25 12.063 ** 14.75 13.25 12.063 ** 14.00 13.25 10.063 **18 17.25 17.25 13.25 ** 17.00 15.25 13.25 ** 16.50 15.25 13.25 ** 15.75 15.25 12.063 **20 19.25 19.25 15.25 ** 19.00 17.25 15.25 ** 18.25 17.25 15.25 ** 17.50 17.25 13.25 **22 21.25 21.25 15.25 ** 21.00 19.25 15.25 ** 20.12 19.25 15.25 ** 19.25 19.25 15.25 **24 23.25 23.25 17.25 ** 23.00 21.25 17.25 ** 22.00 21.85 17.25 ** 21.00 19.25 17.25 **26 25.25 25.25 19.25 25.00 23.25 19.25 23.75 23.25 19.25 22.75 21.25 19.2528 27.25 27.25 21.25 27.00 25.25 21.25 25.50 25.25 21.25 24.50 23.25 19.2530 29.25 29.25 23.25 29.00 27.25 23.25 27.37 27.25 23.25 26.25 25.25 21.2532 31.25 29.25 29.2534 33.25 31.25 31.2536 35.25 33.25 33.25

CLASS

B16.34 Annex ANOMIAL

PIPE SIZE "d" FP RP STD "d" FP RP STD FP RP STD "d" FP RP STD

1500 1500 1500 1500 2500 2500 2500 2500 3500 3500 3500 4500 4500 4500 45000.5 0.50 0.625 ** 0.625 0.44 0.625 ** 0.625 0.625 ** 0.625 0.44 0.625 ** 0.6250.75 0.69 0.625 ** 0.625 0.56 0.625 ** 0.625 0.625 ** 0.625 0.56 0.625 ** 0.625

1 0.87 0.625 0.625 0.625 0.75 0.625 0.625 0.625 0.625 0.625 0.625 0.61 0.625 0.625 0.6251.25 1.12 1.0625 0.625 0.625 1.00 0.625 0.625 0.625 0.625 0.625 0.625 0.86 0.625 0.625 0.6251.5 1.37 1.0625 0.625 0.625 1.12 1.0625 0.625 0.625 1.0625 0.625 0.625 1.09 1.0625 0.625 0.6252 1.87 1.50 1.0625 1.0625 1.50 1.50 1.0625 1.0625 1.50 1.0625 0.625 1.28 1.50 1.0625 0.625

2.5 2.25 2.125 1.50 1.0625 1.87 2.125 1.50 1.0625 1.50 1.0625 1.0625 1.76 1.50 1.0625 1.06253 2.75 2.125 1.50 1.50 2.25 2.125 1.50 1.50 2.125 1.50 1.0625 2.03 2.125 1.50 1.06254 3.62 3.50 2.125 1.50 2.87 3.50 2.125 1.50 2.125 1.50 1.0625 2.63 2.125 1.50 1.06255 4.37 3.50 ** ** 3.62 3.50 ** ** 2.125 ** ** 2.83 2.125 ** **6 5.37 5.125 3.50 ** 4.37 3.50 2.125 ** 3.50 2.125 ** 3.88 3.50 2.125 **8 7.00 6.0625 5.125 ** 5.75 5.125 3.50 ** 5.125 3.50 ** 5.42 5.125 3.50 **

10 8.75 8.0625 7.125 ** 7.25 7.125 6.0625 ** 6.0625 5.125 ** 6.88 6.0625 5.125 **12 10.37 10.063 8.0625 ** 8.62 8.0625 7.125 ** 7.125 6.0625 ** 7.66 7.125 6.0625 **14 11.37 10.063 8.0625 ** 9.50 8.0625 7.125 ** 8.0625 7.125 ** 9.06 8.0625 7.125 **16 13.00 12.063 10.063 ** 10.87 10.063 8.0625 ** 10.063 8.0625 ** 9.87 10.063 8.0625 **18 14.62 13.25 12.063 ** 12.25 12.063 10.063 ** 10.063 8.0625 ** 11.50 10.063 8.0625 **20 16.37 15.25 12.063 ** 13.50 13.25 10.063 ** 12.063 10.063 ** 12.86 12.063 10.063 **22 18.00 17.25 13.25 ** 14.87 13.25 12.063 ** 13.25 12.063 ** 13.88 13.25 12.063 **24 19.62 19.25 15.25 ** 16.25 15.25 13.25 ** 15.25 13.25 ** 15.25 15.25 13.25 **26 21.25 19.25 17.25 17.62 17.25 13.25 15.25 13.25 16.75 15.25 13.2528 23.00 21.25 19.25 19.00 17.25 15.25 17.25 15.25 17.88 17.25 15.2530 24.62 23.25 19.25 20.37 19.25 15.25 19.25 15.25 19.50 19.25 15.25323436

CLASS

V1-1Nominal 150 300 600 900 1500 2500 4500Pipe Size Ball I.D. Ball I.D.

0.5 0.625 0.625 0.625 0.625 0.625 0.625 0.6250.75 0.625 0.625 0.625 0.625 0.625 0.625 0.625

1 0.625 0.625 0.625 0.625 0.625 0.625 0.6251.25 0.625 0.625 0.625 0.625 0.625 0.625 0.6251.5 1.0625 1.0625 1.0625 0.625 0.625 0.625 0.625

2 1.0625 1.0625 1.0625 0.625 0.625 0.625 0.6252.5 1.0625 1.0625 1.0625 1.0625 1.0625 1.0625 1.0625

3 ** ** ** 1.5 1.5 1.5 1.06254 ** ** ** 1.5 1.5 1.5 1.0625

Full Port Valves ANSI Pressure ClassNominal 150 300 400 600 900 1500 2500 4500Pipe Size Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D.

0.5 0.625 0.625 ** 0.625 0.625 0.625 0.625 0.6250.75 0.625 0.625 ** 0.625 0.625 0.625 0.625 0.625

1 1.0625 1.0625 ** 1.0625 0.625 0.625 0.625 0.6251.25 ** ** ** ** 1.0625 1.0625 0.625 0.625

1.5 1.50 1.50 ** 1.50 1.0625 1.0625 1.0625 1.06252 2.215 2.125 ** 2.125 1.50 1.50 1.50 1.50

2.5 ** ** ** ** 2.125 2.125 2.125 1.503 3.0625 3.0625 ** 3.0625 2.125 2.125 2.125 2.1254 4.0625 4.0625 ** 4.0625 3.50 3.50 3.50 2.1255 5.125 5.125 ** 5.125 3.50 3.50 3.50 2.1256 6.0625 0.0625 ** 6.0625 5.125 5.125 3.50 3.508 8.0625 8.0625 ** 8.0625 7.125 6.0625 5.125 5.125

10 10.0625 10.0625 ** 10.0625 8.0625 8.0625 7.125 6.062512 12.0625 12.0625 ** 12.0625 10.0625 10.0625 8.0625 7.12514 12.0625 12.0625 ** 12.0625 12.0625 10.0625 8.0625 8.062516 15.25 15.25 ** 13.25 13.25 12.0625 10.0625 10.062518 17.25 15.25 ** 15.25 15.25 13.25 12.0625 10.062520 19.25 17.25 ** 17.25 17.25 15.25 13.25 12.062522 21.25 19.25 ** 19.25 19.25 17.25 13.25 13.2524 23.25 21.25 ** 21.25 19.25 19.25 15.25 15.2526 25.25 23.25 ** 23.25 21.25 19.25 17.25 15.2528 27.25 25.25 ** 25.25 23.25 21.25 17.25 17.2530 29.25 27.25 ** 27.25 25.25 23.25 19.25 19.2532 31.25 29.25 ** 29.25 ** ** ** **34 33.25 31.25 ** 31.25 ** ** ** **36 35.25 33.25 ** 33.25 ** ** ** **

Reduced Port Valves ANSI Pressure ClassNominal 150 300 400 600 900 1500 2500 4500

Pipe Size Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D. Ball I.D.

0.5 ** ** ** ** ** ** ** **0.75 ** ** ** ** ** ** ** **

1 0.625 0.6525 ** 0.6525 0.6525 0.6525 0.6525 0.65251.25 ** ** ** ** 0.6525 0.6525 0.6525 0.6525

1.5 1.0625 1.0625 ** 1.0625 0.6525 0.6525 0.6525 0.65252 1.50 1.50 ** 1.50 1.0625 1.0625 1.0625 0.625

2.5 ** ** ** ** 1.50 1.50 1.50 1.06253 2.125 2.125 ** 2.125 1.50 1.50 1.50 1.504 3.0625 3.0625 ** 3.0625 2.125 2.125 2.125 1.505 ** ** ** ** ** ** ** **6 4.0625 4.0625 ** 4.0625 3.50 3.50 2.125 2.1258 5.125 6.0625 ** 6.0625 5.125 5.125 3.50 3.50

10 7.125 8.0625 ** 8.0625 7.125 7.125 6.0625 5.12512 8.0625 10.0625 ** 10.0625 8.0625 8.0625 7.125 6.062514 10.0625 10.0625 ** 10.0625 8.0625 8.0625 7.125 7.12516 10.0625 12.0625 ** 12.0625 10.0625 10.0625 8.0625 8.062518 13.25 13.25 ** 13.25 12.0625 12.0625 10.0625 8.062520 15.25 15.25 ** 15.25 13.25 13.25 10.0625 10.062522 15.25 15.25 ** 15.25 15.25 15.25 12.0625 12.062524 17.25 17.25 ** 17.25 17.25 17.25 13.25 13.2526 19.25 19.25 ** 19.25 19.25 19.25 13.25 13.2528 21.23 21.25 ** 21.25 19.25 19.25 15.25 15.2530 23.25 23.25 ** 23.25 21.25 21.25 15.25 15.25

Pipe to Port Effect

There is a considerable impact on Flow, when port sizes do not match Pipe ID

With the usage of P91 pipe, pipe ID’s have increased, which has reduced the valve Cv

The following slide gives an example of Cv for a 2” P91 pipe, with port sizes of 2.125, 1.5 and 1.3

Pipe to Port Effect

2 1/2” P91 pipe, with a 2.125 pipe ID

Port Size Cv

2.125 348

1.5 140

1.3 63

ASME TDP 1

Recommended Practices for the prevention of water damage to steam turbines used for electric power generation.

3.3.3Minimum pipe and valve ID 1” for all drain

valves and valve ports just upstream of the Turbine intercept valve.

ASME TDP 1

3.3.5Before seat drains should have a minimum port and

pipe ID of ¾”.3.3.6Drains after the Mainsteam stop valve should have a

minimum port and pipe ID of ¾”.3.4.3 Cold Reheat drain pots. Should have a minimum

pipe ID and Port size of 2”

ASME TDP 1

3.6.5

Hot Reheat drain lines should have a minimum ID of 1-1/2” with a full ported drain valve.

3.11.7 Drains Systems

The minimum pipe ID and valve porting should be ¾”

ASME Code Section I

• Double Valves are a code requirement for Blow Off Valves, or drain applications that are used as both drains and blow offs.

1ASME B&PV Code Sect. 1 PG

Blow Off ValvesASME B&PV Code Sect. 1 PG 59.1.1.4        Blowoff Piping not exposed to

combustion must have bolted flanged joints (if exposed must have tapped joints).

PG-PG 59.3.5           Blowoff connections shall be between NPS 1 - 2 1/2 (except for boiler's with less than 100 sq.ft. heating surface which may have connections of NPS 3/4). 

ASME B31.1

PG 122.1.4 (A)    Two shuff off valves are required.

PG 122.1.4 (A1)  Design Pressure shall be 125% of maximum allowable working pressure or shall exceed max. working  pressure by 225 psi whichever is less but shall not be below 100 psig.

ASME B31.1

PG 122.1.4 (A2)  The allowable stress value of the piping material shall not exceed that permitted for the temperature of saturated at the maximum allowable working pressure of the boiler. 

PG 122.1.4 (A3)All pipe shall be steel and greater than Schedule 80.

PG 122.1.4 (A4)Blowoff piping shall not be less than that of boiler connection

ASME B31.1

PG 122.1.7 (C1) Valves can not have dams or pockets where sediment can collect.

PG 122.1.7 (C4)Each bottom blowoff pipe shall have two slow-opening valves, or one fast opening valve followed by a slow opening valve.

PG 122.1.7 (C5)When design pressure doesn't exceed 250 psig valve may be of bronze, cast iron, ductile iron or steel.

ASME B31.1PG 122.1.7 (C6)When design pressure exceeds

250 psig valve must be steel and be manufactured to ASME/ANSI Class 300 or greater.Minimum pressure rating shall be equal to the design pressure.

PG 122.1.7 (C8)A slow-opening valve is defined as one needing five 360 degree turns to open.

PG 122.1.7 (C9)A boiler with multiple blowoff pipes needs only one single master pipe.

PG 122.1.7 (C10)The two independent valves may be combined in one valve body.