The studs and nuts are based on TU 3647-005-51705251-11 “Specification for high pressure pipe connections”. The specification is based on the recommendations of the Russian State Standards GOST 12.2.003, GOST 2.114 and FNP Federal Rules and Regulations “Oil and gas industry safety regulations”, TR CU 010/2011 “on the safety of machinery and equipment”, TR CU 032/2013 “On safety of equipment operating under excessive pressure”, GOST 28919, GOST 33259, GOST R 53561, GOST 1759.0, GOST 20700, ASTM A320/A320M, ASMA193/193M, ASTM A194/194m, API 6A, NACE Mr 0175.
Connection elements can be supplied in bulk or as a full set.
When ordering, please specify the following:
All products shall be enclosed with suitable manufacturer’s certificates. Individual deviations from design and reference documents not affecting the product specification or the contract requirements as well as the product appearance can be acceptable based on manufacturer’s approvals.
Main parameters and characteristics of flanges
as per GOST 9150
as per ASME/ANSIB1.1
|Dimension (nominal OD of thread)
from М14 to М76
Metric 27mm OD threads are coarse pitch. OD > 27 mm are 3mm pitch unless otherwise specified by the Customer.
As agreed with the customer we can supply:
Operating medium in pipeline with flanges: oil, gas, gas condensate, water, drilling mud, their mixtures and flushing water with volume fraction of:
Operating temperature range:
Overal dimensions and product weight are specified in the accompanying drawings.
Average service life, years – 10.
Operating medium characteristics, parameters and operating conditions shall be considered for material selection, i.e.:
All bolting shall be made of materials as per GOST1759.0, GOST 20700, GOST 28919, API 6A ASTMA193/193M, ASTM A194/194M, ASTM A320/A320M, NACE MR 0175.
Required material properties
|Standard materials||σ0,2 ,
|Chromium-molybdenum alloy steel Grade L7M as per ASTM A320/A320M||550||690||18||50||235 НВ or 99 НRВ|
|Corrosion-resistant nickel-chromium alloys||725||860||18||50||321 НВ or 35 НRС|
|Alloy steel Grade 2HM as per ASTM A194 / A194M||–||–||–||–||22 НRС|
|Chromium-molybdenum alloy steel Grade L7 as per ASTM A320/A320M||725||860||16||50||321 НВ or 35 НRС|
|Thermostable, heat-resistant alloy steel as per GOST 20700||Mechanical properties of longitudinal samples at normal (20C) temperature and hardness shall conform to Table 3 GOST 20700|
Material selection based on bolting type and operating medium composition for flanges as well as on the operating temperature range shall conform to
|Bolting type||Standard materials|
|Studs for K1 flange connections||Chromium-molybdenum alloy steel Grade L7 as per ASTM A320/A320M|
|Studs for K2/K3 flange connections||Chromium-molybdenum alloy steel Grade L7M as per ASTM A320/A320M|
|Corrosion-resistant nickel-chromium alloys|
|Nuts for K1/K2/K3 flange connections||Alloy steel Grade 2HM as per ASTM A194 / A194M|
|Studs and nuts for flange connections with a medium temperature from 0 C to + 650 C||Thermostable, heat-resistant alloy steel as per GOST 20700|
Marking on bolting ends shall contain:
A batch tag shall contain the product drawing designation and the batch number.
Limited warranty period is 12 months, but not more than 18 months from the date of shipment from the manufacturer. During the warranty period, the manufacturer is responsible for the manufacturing quality and product functionality. During the warranty period, the manufacturer undertakes to eliminate detected faults at its own expense.
The warranty shall be void in case of: