Dished heads (tank & vessel ends) · Size & tolerance table

Small knuckle radius dished heads (shallow tank ends) — dimensions, mass and capacity

Standard: Manufacturer's series (no design-code profile)

Shallow ends with a large dish radius (often 1.3–2 × D) and a small knuckle of 30–50 mm. They save height and material and are used for atmospheric and low-pressure tanks, silos, hoppers and covers — not for pressure vessels, where the design codes require a larger knuckle radius (ASME at least 6% of the crown radius and three times the thickness).

D outside diameter · s thickness · R dish radius · r knuckle radius · h straight flange · H internal height without the straight flange · Ht overall external height (H + h + s) · V capacity in litres including the straight flange.

Shallow dished head with small knuckle radius in section, with outside diameter D, dish radius R, knuckle radius r, thickness s and internal height H

Small knuckle radius heads

D mm	s mm	R mm	r mm	h mm	Ht mm	Mass kg	V L
500	1.2	750	35	20	88	2.7	13
500	1.5	750	35	20	88	3.5	13
500	2	750	35	20	90	4.5	13
500	3	750	35	20	90	7	13
550	1.2	650	40	20	108	2.8	18
550	1.5	650	40	20	108	3.5	18
550	2	650	40	20	110	5	18
550	2.5	650	40	20	110	6.5	18
550	3	650	40	20	110	7.5	18
550	4	650	40	20	110	10.5	18
600	1.2	950	30	20	95	3.4	19
600	1.5	950	30	20	100	4.5	19
600	2	950	30	20	100	6	19
600	2.5	950	30	20	105	7.5	19
600	3	950	30	20	108	9	19
600	4	950	30	20	110	12	19
650	1.2	1000	30	20	100	3.8	23
650	1.5	1000	30	20	100	5	23
650	2	1000	30	20	101	6.5	23
650	2.5	1000	30	20	101	8.3	23
650	3	1000	30	20	102	10	23
650	4	1000	30	20	102	14	23
700	1.2	1050	35	20	108	4.8	28
700	1.5	1050	35	20	110	6	28
700	2	1050	35	20	112	8	28
700	2.5	1050	35	20	112	10	28
700	3	1050	35	20	112	12	28
700	4	1050	35	20	112	16	28
750	1.2	1100	30	20	112	5.2	33
750	1.5	1100	30	20	113	6.5	33
750	2	1100	30	20	113	8.5	33
750	2.5	1100	30	20	115	11	33
750	3	1100	30	20	118	13	33
750	4	1100	30	20	118	18	33
800	1.2	950	50	20	140	6	45
800	1.5	950	50	20	140	7.5	45
800	2	950	50	20	140	10	45
800	2.5	950	50	20	143	13	45
800	3	950	50	20	145	15	45
800	4	1400	50	30	130	20	48
800	5	1400	50	30	130	25	48
850	1.2	1300	40	20	123	6.5	47
850	1.5	1300	40	20	123	8	47
850	2	1300	40	20	125	10.6	47
850	2.5	1300	40	20	125	13.5	47
850	3	1300	40	20	127	16	47
850	4	1300	40	20	127	22	47
900	2	1500	30	20	113	12	49
900	2.5	1500	30	20	113	15	49
900	3	1500	30	20	116	18	49
900	4	1500	50	25	125	24	58
900	5	1500	50	25	125	30	58
950	1.5	1900	30	20	105	10	52
950	2	1900	30	20	105	13	52
950	2.5	1900	30	20	107	16	52
950	3	1900	30	20	108	20	52
950	4	1500	50	30	146	26	74
1000	1.5	2000	30	20	107	11	59
1000	2	2000	30	20	110	15	59
1000	2.5	2000	30	20	110	18	59
1000	3	2000	30	30	118	22	67
1000	4	1600	50	30	150	29	82
1000	5	1600	50	30	150	37	82
1100	1.5	2000	30	20	121	13	77
1100	2	2000	30	20	122	17	78
1100	2.5	2000	30	20	123	22	78
1100	3	2000	30	20	123	26	78
1100	4	2000	30	20	125	35	78
1100	5	1800	50	25	145	45	95
1150	4	1800	50	20	153	38	108
1200	3	2000	50	20	151	31	117
1200	4	2000	50	30	160	41	127
1200	5	2000	50	30	160	51	127
1250	3	2000	50	20	158	34	130
1250	4	2000	50	30	170	45	140
1250	5	2000	50	30	170	56	140
1270	1.5	1900	30	30	160	17	135
1270	2	2500	30	20	125	23	107
1270	2.5	2500	30	20	126	28	107
1270	3	2500	30	20	126	34	108
1270	4	2500	30	30	135	46	120
1270	5	2500	30	30	135	58	120
1300	3	2300	50	20	150	36	138
1300	4	2300	50	20	150	48	138
1300	5	2300	50	30	164	60	153
1350	4	2300	50	20	161	52	155
1400	3	2500	50	20	159	41	165
1400	4	2500	50	30	170	55	180
1400	5	2500	50	30	170	68	180
1430	2	3000	30	20	135	28	140
1430	2.5	3000	30	30	135	35	157
1430	3	3000	30	30	138	43	157
1430	4	3000	30	30	142	56	157
1430	5	3000	30	30	144	71	157
1480	5	2600	50	30	178	78	210
1500	3	2600	50	20	170	48	200
1500	4	2600	50	30	180	64	218
1500	5	2600	50	30	180	80	218
1600	2	3200	30	20	145	35	190
1600	2.5	3200	30	20	146	45	191
1600	3	3200	30	30	155	54	210
1600	4	3200	30	30	157	70	210
1600	5	3200	30	40	170	90	230
1600	6	2800	50	30	188	108	256
1650	4	2800	50	20	180	76	260
1650	5	2800	50	25	180	96	260
1700	2.5	3400	30	30	160	50	245
1700	3	3400	30	30	160	60	245
1700	4	3400	30	40	170	80	270
1700	5	3400	30	40	170	100	270
1800	3	3000	50	20	200	68	322
1800	4	3000	50	20	200	90	322
1800	5	3000	50	25	200	113	322
1800	6	3000	50	30	209	136	352
1840	3	3000	50	30	213	71	372
1840	4	3000	50	30	213	95	372
1840	5	3000	50	30	214	117	373
1900	3	3200	50	20	195	75	357
1900	4	3200	50	20	195	100	357
1900	5	3200	50	25	200	125	357
1900	6	3200	50	30	207	150	390
1950	4	3200	50	30	221	110	430
2000	3	3400	50	20	200	85	422
2000	3.3	3400	50	20	200	92	422
2000	4	3400	50	20	205	111	422
2000	5	3400	50	25	215	138	430
2000	6	3400	50	30	221	167	453
2050	4	3400	50	30	227	117	485
2050	5	3400	50	30	228	146	488
2100	4	3400	50	30	235	123	523
2100	5	3400	50	30	236	154	526
2100	6	3400	50	30	236	185	526
2100	8	3400	50	40	248	250	565
2200	4	3500	50	30	246	135	595
2200	5	3500	50	30	247	167	598
2200	6	3500	50	30	247	204	598
2200	8	3500	50	40	259	270	642
2200	10	3500	50	50	270	340	681
2250	4	3800	50	30	240	140	612
2250	5	3800	50	30	240	176	612
2250	6	3800	50	30	241	211	615
2250	8	3800	50	40	253	290	661
2250	10	3800	50	50	264	360	702
2300	4	3800	50	30	247	148	653
2300	5	3800	50	30	248	185	656
2300	6	3800	50	30	249	222	660
2300	8	3800	50	40	260	300	704
2300	10	3800	50	50	271	380	747
2400	4	4000	50	30	253	160	725
2500	4	4200	50	30	260	175	806
2500	5	4200	50	30	260	215	806
2500	6	4200	50	30	261	260	810
2500	7	4200	50	40	272	303	862
2500	8	4200	50	40	272	350	862
2500	10	4200	50	50	284	440	918
3000	4	5400	50	30	283	252	1246
3000	5	5400	50	30	283	315	1246
3000	6	5400	50	30	284	378	1251
3000	7	5400	50	40	295	441	1327
3000	8	5400	50	40	295	508	1327
3000	10	5400	50	50	302	640	1409
3000	12	5400	50	50	308	760	1414
3000	15	5400	50	60	321	970	1501
3000	18	5400	50	60	323	1160	1512
3000	20	5400	50	60	324	1300	1518
3000	24	5400	50	60	327	1549	1535
3500	4	6200	100	30	360	347	2232
3500	5	6200	100	30	360	434	2232
3500	6	6200	100	30	361	521	2238
3500	8	6200	100	40	373	700	2349
3500	10	6200	100	50	384	870	2450
3500	12	6200	100	50	386	1050	2465
3500	15	6200	100	60	398	1320	2573
3500	18	6200	100	60	400	1575	2587
3500	20	6200	100	60	401	1760	2592
3500	24	6200	100	60	404	2130	2614
4000	5	6800	120	30	423	570	3396
4000	6	6800	120	30	424	690	3406
4000	8	6800	120	40	435	925	3539
4000	10	6800	120	50	447	1170	3683
4000	12	6800	120	50	448	1380	3691
4000	15	6800	120	60	460	1730	3832
4000	18	6800	120	60	462	2080	3849

Notes

Every row was checked against the geometry of a torispherical head (crown and knuckle radius, inside diameter D − 2s): the height, the capacity and the mass agree with the calculated values to within a few per cent except where corrected below.
For D 600 the listed heights are about 8 mm more than the geometry gives for R 950 / r 30; the maker's actual knuckle is probably slightly larger. They are left as printed.
Figures are from a fabricator's catalogue and are typical.