ANSI Chart Cast and Ductile Iron Flange Chart Dimensions ...

1 CERTIFIEDG lobal Supply Line Pty Ltd ABN 86 008 134 512 Head Office - 1 to 23 Barndioota Rd Salisbury Plain South Australia 5109 Ph +61 (0)8 8285 0000 Fax +61 (0)8 8285 0088 AND PIPELINE SUPPLIESADELAIDE BRISBANE PERTHANSI 125 150 250 300 CLASS CAST IRON & Ductile IRON Flange (ASME & ) Chart Dimensions & PRESSURE TEMPERATURE RATINGSIn terms of drilling and fl ange 125 class is the same as 150 class and 250 class if the same as 300 class. It should be noted that some soft seated valves such as knife gate, rubber lined butterfl y or sluice gate valves may have a lower maximum working pressure than the fl ange is rated and AWWA standards provide Dimensions for various classes of fl anges. Given those Dimensions , the standards development organisations establish pressure ratings for fl anges and fi ttings based on the materials from which they re made and the temperatures are which they re used. These pressure classes of 125, 25, 300, etc.

2 Cause considerable confusion in the industry. This is because the classes often are interpreted as rated pressures of the fl ange; but nothing could be more further than the , these classes are designations that generally represent a pressure and temperature for saturated steam. For example, an ASME Class 125 fl ange is rated for 125 psi at 353 F (178 C), which is the boiling temperature for water at that pressure. As temperature increases, the pressure rating of the fl ange decreases. For example, a Class 150 fl ange is rated about 270 psi at ambient conditions ( 100 F or 38 C), 180 psi at 400 F (204 C), 150 psi at 600 F (316 C), and 75 psi at 800 F (427 C). At ambient temperatures, it makes sense that the pressure ratings are higher than the saturated steam pressure. When the temperature rises, the rated pressure goes down and vice versa. Pressure and temperature tables in the applicable standards must be consulted to apply them to a piping general summary of fl ange pressure ratings versus temperatures is shown in Table 1.

3 The ASME pressures represent non shock pressure ratings, as in stead pressures, not pressure spikes or cyclic water hammers. In all cases, as the maximum temperature increases, the pressure rating of the fl ange goes down. Metals are weaker at high temperatures. Most of the time, the pressure ratings do not match the class designation at 100 F (38 C). As the class designation increases, the pressure rating increases. Ductile iron fl anges are rated higher than grey iron fl ASME standards contain many other standard pressure classes. But in the waterworks industry, Class 125 and Class 250 apply to grey iron fl anges, while Class 150 and Class 300 apply to Ductile iron, steel and stainless steel (ASME , ASME ). The bolting patterns of Class 125 and Class 150 match, as do Class 250 and Class 300. It is important not to assume the rating of the fi tting or valve is the same as the fl or AWWA valve standards or/ and the materials the valve maker uses on the valve, can and does down rate the valve pressure rating despite what fl anging the valve may be supplied SUPPLY LINET able 1.

4 Nonshock pressure ratings of gray and Ductile iron fl anges in psigMax STANDARDS (ASME and ASME STANDARDS (AWWA C110)Gray Iron ASTMA126 Ductile Iron ASTMA 395 Gray IronDuctile IronClass BGr 60-40-18 Class 25 or 30Gr 70-50-05 CLASS 125 CLASS 250 CLASS 150 CLASS 300 CLASS 125 CLASS 125 NPS1-12 NPS14-24 NPS1-12 NPS14-24 NPS1-12 NPS14-24 NPS1-12 NPS14-24 NPS3-12 NPS14-24 NPS3-12 NPS14-2438 C (100 F)200150500300250250640640250250350*350* 93 C (200 F)190135460280235235600600149 C (300 F)165110375240215215565565* With special gasket containing molded annular sealing elementsMaximum working pressures for cast iron fl anged pipe fi ttings according ANSI :Maximum Working Pressure (psi)6005004003002001000-500501001512002 503003504004501 - 12 14 - 24 30 - 48 1 - 12 14 - 24 30 - 48 Pipe Dimension(inches)Class 125 Class 250 Working Temperature (deg F)Maximum Working Pressure (psig)TemperaturePressure Class125250 Pipe Size (inches)1 - 1214 - 2430 - 481 - 1214 - 24 1) to C (-20 to 150 F) C (200 F)190135115460280107 C (225 F)180130100440270121 C (250 F)17512585415260135 C (275 F)17012065395250149 C (300 F)16511050375240163 C (325 F)155105-355230177 C (350 F)150100-335220191 C (375 F)145--315210204 C (400 F)140--290200218 C (425 F)130--270-232 C (450 F)125--250-1) For liquid service - fl anges only.

5 Materials of construction ASTM A 126 Class BGLOBAL SUPPLY LINEF lange Dimensions250 / 300 LB DrillingANSI Class 250 / ANSI /ANSI Class 300 / MSS SP-44 Class 300 Nom. Dia. ( )Bolt Circle Dia. ( )# of BoltsDia. of * * * *36* * * *40* * * Dimension shown does not meet MSS SP-44125 - 150 LB DrillingNom. Dia ( )Bolt Circle Dia. ( )# of BoltsDia. of HolesDia of HolesDia of HolesDia of HolesANSI 125 ANSI C207-78 Table a Class DTable 2 Class DTable 3 Class EAWWA C207-78 Table 1 Class BTable 2 Class here for our complete stock list of fl anges, fi ttings and ANSI/ ASME valves 125 up to 2500 Class. We stock a full range of ball, check, gate, globe, needle, plug valves and strainers in cast iron, Ductile iron, carbon steel, stainless steel, alloy steel, etc. We also stock undrilled fl anged end valves to accommodate special drillings. Global Supply Line ships Worldwide. Copyright Global Supply Line Pty Ltd 2018 ANSI Cast and Ductile Iron Flange Chart Dimensions & Pressure Temperature Ratings - AS