Piping

Fitting dimensions

In short

Butt-weld elbows, tees, reducers, caps: ASME B16.9 and EN 10253-2.

Dimensions

A90° elbow: centre to face
Long radius (LR) = 1.5 × NPS; short radius (SR) = 1 × NPS.
B45° elbow: centre to face
C · MEqual tee: centre to face
C on the run, M on the branch; equal on an equal tee.
HReducer: length
ECap: height

ASME B16.9: elbows (mm)

NPS	OD	A LR	B 45°	A SR
1/2	21.3	38	16	—
3/4	26.7	38	—	—
1	33.4	38	22	25
1 1/4	42.2	48	25	32
1 1/2	48.3	57	29	38
2	60.3	76	35	51
2 1/2	73.0	95	44	64
3	88.9	114	51	76
4	114.3	152	64	102
5	141.3	190	79	127
6	168.3	229	95	152
8	219.1	305	127	203
10	273.0	381	159	254
12	323.8	457	190	305
14	355.6	533	222	356
16	406.4	610	254	406
18	457.0	686	286	457
20	508.0	762	318	508
24	610.0	914	381	610

ASME B16.9: tees, reducers, caps (mm)

NPS	OD	C	H	E
1/2	21.3	25	—	25
3/4	26.7	29	38	25
1	33.4	38	51	38
1 1/4	42.2	48	51	38
1 1/2	48.3	57	64	38
2	60.3	64	76	38
2 1/2	73.0	76	89	38
3	88.9	86	89	51
4	114.3	105	102	64
5	141.3	124	127	76
6	168.3	143	140	89
8	219.1	178	152	102
10	273.0	216	178	127
12	323.8	254	203	152
14	355.6	279	330	165
16	406.4	305	356	178
18	457.0	343	381	203
20	508.0	381	508	229
24	610.0	432	508	267

— : no value confirmed by two sources.

EN 10253-2 (mm)

DN	OD	R 3D	R 2D	F tee	L red.
15	21.3	28	17.50	25	—
20	26.9	29	25	29	38
25	33.7	38	25	38	51
32	42.4	48	32	48	51
40	48.3	57	38	57	64
50	60.3	76	51	64	76
65	76.1	95	63	76	89
80	88.9	114	76	86	89
100	114.3	152	102	105	102
125	139.7	190	127	124	127
150	168.3	229	152	143	140
200	219.1	305	203	178	152
250	273.0	381	254	216	178
300	323.9	457	305	254	203
350	355.6	533	356	279	330
400	406.4	610	—	305	356
450	457.0	686	—	343	381
500	508.0	762	—	381	—

Below DN 25, EN elbows do not have the ASME radii: never mix the two standards.

Sources

ASME B16.9-2018 (raccords à souder bout à bout) : Tableaux coudes 90°/45° LR, 90° SR, tés, réductions, calottes ; relevé MAI Piping, recoupé PipeData (pouces), consultés le 08/11/2026 (link)
EN 10253-2:2021+A1:2026 (raccords à souder bout à bout) : Coudes 2D/3D (rayon R), tés égaux (F), réductions (L) ; tableaux Zickwolff, consultés le 08/11/2026 (link)
PipeData : raccords ASME B16.9 (pouces, contrôle) : Coudes, tés, réductions, calottes (link)

Updated 9 November 2026 · Publisher: The Level Code

Tools · Piping

Isometric planLine entered item by item: dimensioned isometric, 3D, spool cut list, bill of materials, welds, PDF.Pipe offsetOffset a line with two elbows: cut length, angle from the spool or the run, elbow cut layout.Rolling offsetOffset both up and sideways with two elbows: true offset, cut length, elbow roll.Parallel pipe offsetSeveral parallel lines through the same offset: start shift of each line, cut length.Branch on pipeSaddle cut for a square, angled or offset branch: generator lengths and full-size wrap-around template.Branch on elbowSaddle cut for a branch at the middle of an elbow (outer side or flank): generators and full-size template.Mitre bendSegmented elbow: cut angle, outside / centreline / inside length of each piece, cutting template.Cut-down elbowCut a 90° or 45° elbow down to any angle: lengths at the back, side and belly, marks and cutting template.Tee + elbowTake-out of an elbow fitted on an equal tee, direct or with a spool; spool to cut for a given dimension.Swept teeBranch made from an elbow laid on the header: elbow cut, height-gauge marks, full-size header hole.ReducerConcentric or eccentric reducer: angle, taper and flat pattern to mark out on plate.Pipe bendingCut length, bend marks from the end, gain and approximate wall thinning.Standard fittingsTake-out of buttweld elbows, tees, reducers and caps (ASME B16.9, EN 10253-2).Flanges and boltingDrilling, bolts, studs and wrench size of an EN 1092-1 (PN) or ASME B16.5 (class) flange.Flange gasketDimensions of EN 1514-1 and ASME B16.21 flat gaskets and ASME B16.20 spiral wound gaskets (rings included).Jacketed pipePipe in a pipe: gap, spacers (height, count, positions), volumes, weight and gap in the elbows.Line weightWeight of a pipe run per metre and in total: pipe, water, insulation.Hydrostatic testIndicative test pressure (PED / EN 13480-5 or ASME B31.3) and gauge range.