Material: Tantalum coil heat exchanger 
Construction + Standard  :  
Tantalum tubing according to ASTM B 521-98 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) alloy tubing according to ASTM B 521-98 UNS R05252
Tantalum tube plates according to ASTM B 708 -99 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) tube plate according to ASTM B 708-98 UNS R05252
Tantalum supports according to ASTM B 708 -99 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) alloy support according to ASTM B 708 -98 UNS R05252
Tantalum union according to ASTM B 521-98 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) alloy union according to ASTM B 521-98 UNS R05252
Tantalum flanges according to ASTM B 708 -99 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) alloy flange according to ASTM B 708 -98 UNS R05252
All Tantalum spare parts according to ASTM B 708 -99 UNS R05200 or ASTM B 365 -99 UNS R05200 or Tantalum 2.5% tungsten (Ta 2.5% W) alloy spare parts according to ASTM B 708 -99 UNS R05252 or ASTM B 365 -99 UNS R05252 or other ASTM relative standards.
Temper : As Drawn, Annealed.
The Required Chemical composition :  
            O         0.0150 %max
            C         0.0100 %max
            N         0.0100 %max
            H         0.0015 %max
            Fe        0.0100 %max
            Ni        0.0100 %max
            Si        0.0050 %max
            Ti        0.0100 %max
            Mo       0.0200 %max
            W        0.0500 %max
            Nb       0.1000 %max
            Ta balance (typically 99.92%)
Physical & Mechanical property :
            Tensile strength 207 MPa min.
            Yield strength    138 MPa min. 
            Elongation         25%min.

or
Temper : As Drawn, Annealed with The Required Chemical composition :  

Non-Destructive Test (NDT) -Dye Penetrant Examination (PT) will be applicable for all welded area.
Hydrostatic test for leaking test is required.
Size available : 
Tailor to customer's drawing, blueprint. 

Typical sizes of tantalum tube :
14mm OD x 0.40mm WTx R/L;
14mm OD x 13mm ID x 0.50mm WTx R/L;
14mm OD x 0.50mm WTx R/L;
14mm OD x 13mm ID x 0.50mm WTx R/L;
14mm OD x 10mm ID x 2.00mm WTx R/L;
14mm OD x 10mm ID x 2.00mm WTx R/L;
14mm OD x 2.5mm WT x R/L;

15mm OD x 14.20mm ID x 0.4mm WTx R/L;
15mm OD x 0.50mm WTx R/L;
15.9mm OD x 0.50mm WTx R/L;
16mm OD x 0.40mm WTx R/L; 
16mm OD x 0.50mm WTx R/L;
17mm OD x 1.00mm WTx R/L; 
18mm OD x 16mm ID x1.00mm WTx R/L;
18mm OD x 15mm ID x1.50mm WTx R/L;
18mm OD x 13mm ID x2.50mm WTx R/L;

19.0mm OD x 17mm ID x 1.00mm WTx R/L;
19.05mm OD x 0.381mm WT (3/4"=OD, 0.015"=WT) x R/L;
19.05mm OD x 0.50mm WT x R/L (3/4"=OD, 0.02"=WT x R/L);
19.05mm OD x 0.60mm WT x R/L (3/4"=OD x R/L);
19.05mm OD x 16.56mm ID x 1.24mm WT(3/4"=OD, 0.049"=WT x R/L);
19.05mm OD x 1.65mm WT x R/L; (3/4"=OD x R/L);
19.5mm OD x 18.7mm ID x 0.4mm WT x R/L;
OD 3/4" x WT 0.015" x R/L;
OD 3/4" x WT 0.02" x R/L;
19.05 mm OD x 0.5 mm Wall x R/L; 
19.05MM (±0.102) OD X 0.406MM(±0.0406) WT X R/L;
19.05MM(±0.102) OD X 0.406MM(±0.0406) WT X R/L for tantalum heat exchanger
OD 19.05 X 0.9 Thk X R/L;
19.05mm OD x 16.55mm ID x 1.25 mm Thick x R/L;

20mm OD x 0.9mm WTx R/L;
21.3mm OD x 17.3mm ID x 2mm WT x R/L;
24mm OD x 1mm WTx R/L;

25mm OD x 2mm WTx R/L; 
25mm OD x 2mm WTx R/L;
25.4mm OD x 24.6mm ID x 0.4mm WTx R/L; (1"=OD x R/L);
25.4mm OD x 24.3mm ID x 0.55mm WT (1"=OD) at R/L;
25.5mm OD x 24.7mm ID x 0.4mm WT x R/L (1"=OD) at R/L;
25.4mm OD 24.4mm ID x 0.5 mm Wall X R/L;
OD 1" x WT 0.55 mm x R/L;
26.4mm OD x 0.5mm WTx R/L;

30mm OD x 20mm ID x 5mm WT x R/L; 
31.75mm OD x 0.381mm WT x R/L; (1-1/4"=OD, 0.015"=WT x R/L);
32mm OD x 0.4mm WT x R/L;
32mm OD x 0.7mm WT x R/L;
OD33.7(+/-0.13) x WT2.0(+/-10%) x R/L;
33.7mm OD x 2mm WT x R/L; 
35.0mm OD x 2mm WT x R/L;

38mm OD x 2.5mm WT x R/L;
38mm OD x 1.30mm WTx R/L; 
38.10mm OD x 0.6096mm WT x R/L; (1-1/2"=OD, 0.024"=WT, R/L);

OD42.2(+/-0.15) x WT2,0(+/-10%) x R/L;

60.3MM OD x 56.30MM ID x 2MM WTX R/L;
60MM OD x 54MM ID x 3MM WTX R/L;
120 mm OD x 1.6mm Wall x R/L;

Typical application: Tantalum tubing is mainly used to make tantalum reaction vessel, tantalum heat exchangers(shell & tube heat exchanger), tantalum pipe line(piping or channel), tantalum condenser, tantalum agitator, tantalum cooler, tantalum boiler, tantalum bayonet heater, tantalum spiral (helical) coil, U-tube heat exchanger or "U" tube bundle heat exchanger in the chemical industry for condensing, re-boiling, preheating and cooling of nitric acid, sulfuric acid, hydrochloric acid, bromic acid and combinations of these acids with many other chemicals. tantalum tube is also used in  liquid metal tanks and other glass-lined containers.

Trade name: tantalum tube heat exchanger, tantalum tube coil heat exchanger, tantalum tubing heat exchanger, tantalum tubings exchanger, tantal tube heating exchanger system, tantal tubes heat exchanger, tantal pipe heat exchanger, tantal pipes heater, tantal heater, tantal tubings heater, tantalum shell, tantalum heat exchanger system tube, etc .,

Standard Specification ASTM B 708 -05 for Tantalum Ribbon, Tantalum Alloy Ribbon, Tantalum Strip, Tantalum Alloy Strip, Tantalum Foil, Tantalum Alloy Foil, Tantalum Sheet, Tantalum Alloy Sheet, Tantalum Plate, Tantalum Alloy Plate.
This specification covers unalloyed and alloyed Tantalum Ribbon, Tantalum Alloy Ribbon, Tantalum Strip, Tantalum Alloy Strip, Tantalum Foil, Tantalum Alloy Foil, Tantalum Sheet, Tantalum Alloy Sheet, Tantalum Plate, Tantalum Alloy Plate as follows: 
1. ASTM B 708 -05 UNS R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both. 
2. ASTM B 708 -05 UNS R05400, unalloyed tantalum, powder-metallurgy consolidation. 
3. ASTM B 708 -05 UNS R05255, tantalum alloy, 90% tantalum 10% tungsten, electron-beam furnace or vacuum-arc melt, or both. 
4. ASTM B 708 -05 UNS R05252, tantalum alloy, 97.5% tantalum 2.5% tungsten, electron-beam furnace or vacuum-arc melt, or both. 
5. ASTM B 708 -05 UNS R05240, tantalum alloy, 60% tantalum 40% columbium, electron-beam furnace or vacuum-arc melt. 
+++++++++++++++++++ 
Standard Specification ASTM B 521 -98 for Tantalum Tube + Tantalum Alloy Tube Seamless and Welded.This specification covers tantalum and tantalum alloy seamless and welded tubes of the following grades:  
1. ASTM B 521 -98 UNS R05200, unalloyed tantalum, vacuum melt;  
2. ASTM B 521 -98 UNS R05200, unalloyed tantalum, powder-metallugry consolidation;  
3. ASTM B 521 -98 UNS R05255, tantalum alloy, 90% tantalum 10% tungsten alloy, vacuum melted;  
4. ASTM B 521 -98 UNS R05252, tantalum alloy, 97.5% tantalum 2.5% tungsten alloy, vacuum melted;  
5. ASTM B 521 -98 UNS R05240, tantalum alloy, 60% tantalum 40% columbium, electron-beam furnace or vacuum-arc melt, or both.