Before you buy titanium pipe fittings, the basic knowledge you  should know is Titanium fittings dimension, tolerance, material grade, bevelling.

Titanium Pipe Fittings Dimensions:

Dimensions of Titanium Elbows and Returns   ASME/ANSI B16.9
Nominal Pipe Size (NPS)	Outside Diameter Bevel D	Center to End			Center to Center		Back to Faces
		45° Elbows	90° Elbows		180° Elbows
		B	A		P		K
		Long Radius	Long Radius	Short Radius	Long Radius	Long Radius	Long Radius	Long Radius
1/2	21.3	15.7	38.1	/	76.2	/	47.8	/
3/4	26.7	19.1	38.1	/	76.2	/	50.8	/
1	33.4	22.4	38.1	25.4	76.2	50.8	55.6	41.1
1-1/2	42.2	25.4	47.8	31.8	953	63.6	69.9	52.3
1-3/4	48.3	28.4	57.2	38.1	114.3	76.2	82.6	62
2	60.3	35.1	76.2	50.8	152.4	101.6	106.4	51
2-1/2	70.3	44.5	95.3	63.5	190.5	127	131.8	100.1
3	88.9	50.8	114.3	76.2	228.6	152.4	158.8	120.7
3-1/2	101.6	57.2	133.4	88.9	266.7	177.8	184.2	139.7
4	1143	63.5	152.4	101.6	304.8	203	209.6	158.8
5	141.3	19.2	190.5	127	381	254	261.9	196.9
6	1683	95.3	228.6	152.4	457.2	304.8	312.7	236.5
8	219.1	127	304.8	203.2	609.6	406.4	414.3	312.7
10	273.1	158.8	381	254	762	508	517.7	390.7
12	323.9	190.5	457.2	304.8	914.4	609.6	619.3	466.9
14	355.6	222.3	533.4	355.6	1066.8	711.2	711.2	533.4
16	406.4	254	609.6	406.4	1219.2	812.8	812.8	609.6
20	508	317.5	762	508	1524	1016	1016	762
22	558.8	342.9	838.2	558.8	1676.4	1117.6	1117.6	838.2
24	609.6	381	914.4	609.6	1828.8	1219.2	1219.2	914.4
26	660.4	406	990.6	/	/	/	/	/
28	711.2	438.2	1066.8	/	/	/	/	/
30	762	469.9	1143	/	/	/	/	/
32	812.8	501.7	1219.2	/	/	/	/	/
34	863.6	533.4	1295.4	/	/	/	/	/
36	914.4	565.2	1371.6	/	/	/	/	/
38	965.2	599.9	1447.8	/	/	/	/	/
40	1016	632	1524	/	/	/	/	/
42	1066.8	660.4	1600.2	/	/	/	/	/
44	1117.6	695.5	1676.4	/	/	/	/	/
46	1168.4	726.9	1752.6	/	/	/	/	/
48	1219.2	758.9	1828.8	/	/	/	/	/

Titanium Pipe Fittings Material Grade

Titanium Pipe Fittings Chemical Composition
CHEMICAL COMPOSITION	ASTM B363
(Max. Values)	WPT-1	WPT-2	WPT-5	WPT-7	WPT-9	WPT-12	WPT-23
N. Nitrogen	0.03	0.03	0.05	0.03	0.02	0.03	0.03
C. Carbon	0.1	0.1	0.1	0.1	0.05	0.08	0.08
H. Hydrogen	0.015	0.015	0.0125	0.015	0.013	0.015	0.0125
Fe. Iron	0.2	0.3	0.4	0.3	0.25	0.3	0.25
O. Oxygen	0.18	0.25	0.2	0.25	0.12	0.25	0.13
Pd. Palladium				0.12-0.25
Al. Aluminum			5.5-6.75		2.5-3.5		5.5-6.5
Mo. Molybdenum						0.2-0.4
V. Vanadium			3.5-4.5		2.0-3.0		3.5-4.5
Ni. Nickel						0.6-0.9
Ti. Titanium	Bal.	Bal.	Bal.	Bal.	Bal.	Bal.	Bal.

Titanium Pipe Fittings Tolerance:

1. General tolerance for all titanium pipe fittings of ASME B16.9

NPS	DN	O.D	I.D	Off Angle, Q	Off Plane, P
1/2~2-1/2	15~65	+1.6, -0.8	±0.8	±1	±2
3~3-1/2	80~90	±1.6	±1.6	±2	±4
4	100	±1.6	±1.6	±3	±5
5~8	125~200	+2.4, -1.6	±1.6	±3	±6
10~18	250~450	+4.0, -3.2	±3.2	±4	±10
20~24	500~600	+6.4, -4.8	±4.8	±5	±10
26~30	650~750	+6.4, -4.8	±4.8	±5	±13
32~48	800~1200	+6.4, -4.8	±4.8	±5	±19

*All dimensions are in mm unit. NPS: Nominal Pipe Size; DN: Nominal Diameter.
*O.D: outside diameter at bevel; I.D: inside diameter at end; Both P & Q are angularity tolerances.
*A minimum wall thickness of 87.5% should apply unless otherwise specified by the purchaser.

2. Tolerances of Center-to-End & Overall Length Dimensions

NPS	DN	*I	*II	*III	*IV
1/2~2-1/2	15~65	±2	±3	±2	±3
3~3-1/2	80~90	±2	±3	±2	±3
4	100	±2	±3	±2	±3
5~8	125~200	±2	±3	±2	±6
10~18	250~450	±2	±3	±2	±6
20~24	500~600	±2	±3	±2	±6
26~30	650~750	±3	±6	±5	±10
32~48	800~1200	±5	±6	±5	±10

*All dimensions are in mm unit.
*I refers to the tolerances for center-to-end dimensions of 90° & 45° long and short radius elbows and tees, A, B, C, M.
*II refers to the tolerances for center-to-end dimensions of 3D radius elbows, A, B.
*III refers to the tolerances for overall length of reducers and lap joint stub ends, F, H.
*IV refers to the tolerances for overall length of caps, E.

3. Tolerances for 180° Returns & Lap Joint Stub Ends

NPS	DN	180° Return			Lap Joint Stub Ends
inch	mm	O	K	U	G	R	T
1/2~2-1/2	15~65	±6	±6	±1	+0, -1	+0, -1	+1.6, -0
3~3-1/2	80~90	±6	±6	±1	+0, -1	+0, -1	+1.6, -0
4	100	±6	±6	±1	+0, -1	+0, -2	+1.6, -0
5~8	125~200	±6	±6	±1	+0, -1	+0, -2	+1.6, -0
10~18	250~450	±10	±6	±2	+0, -2	+0, -2	+3.2, -0
20~24	500~600	±10	±6	±2	+0, -2	+0, -2	+3.2, -0

*All dimensions are in mm unit.
*O: center-to-center dimensions; K: back-to-face dimensions; U: alignment of ends.
*G: outside diameter of lap; R: fillet radius of lap; T: Lap thickness.

Titanium Pipe Fittings Bevelling

There are three types of ends for titanium pipe fittings,  they are flat ends, plain bevelling ends and compound bevelling ends. the bevellings are classified by wall thickness for ttanium pipe fittings.

1. for titanium pipe fittings wall thickness less than 3mm, titanium pipe fittings can be supplied with  flat ends.

2. for wall thickness 3mm-22mm, titanium pipe fittings supplied with 37.5 degrees bevelling at ends with 1.5mm root face.

3. for wall thickness more than 22mm, titanium pipe fittings supplied with 10 deg. and 37.5 deg, bevelling with 1.5mm root face