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

Medium radius dished heads for tanks — dimensions, mass and capacity

Standard: Manufacturer's series for storage tanks

Dished ends with a dish radius equal to the diameter and a knuckle of 50–180 mm, between the shallow small-knuckle head and the full torispherical head. They are made for horizontal storage tanks — fuel and water tanks above and below ground — including the inner and outer shell of double-walled tanks.

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.

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

Single-wall tank heads

D mm	s mm	R mm	r mm	h mm	Ht mm	Mass kg	V L
950	3	950	50	30	190	24	88
950	4	950	50	30	190	32	88
950	5	950	50	30	190	40	88
1250	3	1250	50	30	230	40	178
1250	4	1250	50	30	230	52	178
1250	5	1250	50	30	230	65	178
1500	4	1500	55	30	260	73	290
1500	5	1500	55	30	260	90	290
1900	5	1900	70	30	330	142	570
1900	6	1900	70	30	330	170	570
2500	6	2500	95	30	423	290	1260
3000	6	3000	180	30	540	420	2390

Heads for double-walled tanks (outer shell)

The outer head is a few millimetres larger in diameter than the inner one so that the interstitial space can be monitored.

D mm	s mm	R mm	r mm	h mm	Ht mm	Mass kg	V L
1258	3	1250	50	30	230	40	180
1508	3	1500	50	30	265	55	290
1908	3	1900	70	30	330	85	580
2512	5	2500	95	30	425	240	1280
3012	5	3000	180	30	545	350	2420

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.
Figures are from a fabricator's catalogue and are typical.