burst

American Tube

Theoretical Internal Burst Pressures (psi)
Wall Thickness		Outside Diameter in Inches and PSI Welded T304 & T316 Stainless Steels at -20°F to 100°F
BWG	Decimal	1/4	5/16	3/8	7/16	1/2	9/16	5/8	11/16	3/4	7/8	1
31	.010	6000	4800	4000	3429	3000	2667	2400	2182	2000	1714	1500
30	.012	7200	5760	4800	4114	3600	3200	2880	2618	2400	2057	1800
29	.013	7800	6240	5200	4457	3900	3467	3120	2836	2600	2229	1950
28	.014	8400	6720	5600	4800	4200	3733	3360	3055	2800	2400	2100
27	.016	9600	7680	6400	5486	4800	4267	3840	3491	3200	2743	2400
26	.018	10800	8640	7200	6171	5400	4800	4320	3927	3600	3086	2700
25	.020	12000	9600	8000	6857	6000	5333	4800	4364	4000	3429	3000
24	.022	13200	10560	8800	7543	6600	5867	5280	4800	4400	3771	3300
23	.025	15000	12000	10000	8571	7500	6667	6000	5455	5000	4286	3750
22	.028	16800	13440	11200	9600	8400	7467	6720	6109	5600	4800	4200
21	.032	19200	15360	12800	10971	9600	8533	7680	6982	6400	5486	4800
20	.035	21000	16800	14000	12000	10500	9333	8400	7636	7000	6000	5250
19	.042	25200	20160	16800	14400	12600	11200	10080	9164	8400	7200	6300
18	.049	29400	23520	19600	16800	14700	13067	11760	10691	9800	8400	7350
16	.065	39000	31200	26000	22286	19500	17333	15600	14182	13000	11143	9750

The above table represents theoretical bursting pressures based on Barlow's Formula: P = ^2St/_D Where:
P = burst pressure (psi)
S = tensile strength (75,000 psi for T304 & T316)
t = wall thickness (inches)
D = outside diameter (inches)

Burst Pressure Conversion Factors
Alloy	Temperature °F
Alloy	100°	300°	500°
304	1.00	0.83	0.77
304L	0.93	0.85	0.75
316	1.00	0.90	0.85
316L	0.93	0.84	0.75
321	1.00	0.80	0.77
825	1.13	1.09	0.97
2205	1.20	1.16	1.09

To determine burst pressure, multiply the Conversion Factor corresponding to the alloy and temperature needed bt the Theoretical Burst Pressure for the size (from the top table).