Seamless Tubing with External Upset Ends and Couplings Hydrosulfite and Cold-Resistant

The tubing per this TU is meant for regular operation in corrosive hydrosulfide media with parameters specified in Table 5 "Safety Regulations for Petroleum and Gas Industries".

TU 1308-206-0147016-01

The tubing per this TU is meant for regular operation in corrosive hydrosulfide media with parameters specified in Table 5 "Safety Regulations for Petroleum and Gas Industries". Besides, the tubing has enhanced corrosion resistance at well treating with hydrochloric acid and is cold-resistant up to temperature -50°C.
The general corrosion rate for tubing metal is not more than 0.5 mm/year.
The tubes are manufactured with strength group Es with range as per GOST 633-80. 

The range of tubes, subs and couplings is specified by Table 1.

Tube type	Outside Diameter mm	Tube wall thickness, mm	Strength group
With Externally Upset Ends (NKV) as per GOST 633-80	73,0 89,0	5,5 : 7,0 6,5 : 8,0	Es

The tubes are manufactured in version A per GOST 633-80.
In coordination with client the tubes can be manufactured with the length up to 11 meters.
The tubes are manufactured from tube shell made from steel 30 KhMBFA.

Mechanical properties of tubes and couplings are specified by Table 1.1.

Parameter description	Strength group Es
Tensile strength, σt, N/mmІ (kgf/mm2), not less than	657 (67)
Yield strength, σy, N/mmІ (kgf/mm2), not less than not more than	549 (56) 657 (67)
Ratio σy/σt, not more than	0,9
Rockwell hardness, not more than	98 HRB
Elongation, δ5, %, not less than	16
Impact strength at Charpy specimens, J/cmІ (kg cm/mm2), at test temperature -50°C not less than KCV-50°C.	98(10)
Share of ductile component (V) at test temperature -50°C %, not less than	70

Table 5 from "Safety Regulations for Petroleum and Gas Industries"

Produced fluid type	Hydrogen sulfide concentration, volume percent in respect to the whole gas phase volume (in g/m3 of gas)	Pressure abs., Pa (atm)
Humid gas or watery (with traces of water) oil with gas factor above 890 Nm3/m3	up to 0.075 (up to 1.15) 0.075-10.0 (1.15-154) above 10.0 (above 154)	PH2S > 345 (352х10^-5) Рsum> 45х 10^4 (4,6) At any values of PH2S and Рsum
Humid gas or watery (with traces of water) oil with gas factor less than 890 Nm3/m3	up to 0.02 (up to 0.31) 0.02-4,0 (0,31-61) 4.0-15.0 (61-228) above 15.0 (above 228)	PH2S > 345 (352х10^-5) Рsum> 1,83х10^6 (18,6) PH2S > 6,9х10^4 (0,7) At any values of PH2S and Рsum

Note: All seven media variants are adequate in relation to corrosion activity.