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Spectacle flanges and blinds

The spectacle flanges and blinds conform to the specification 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 flanges, please specify the following:

  • flange type;
  • Flange DN, mm;
  • PN, MPa or # (as per ANSI);
  • flange facing
  • operating medium characteristics;
  • temperature conditions or climatic category;
  • reference standard for flange design and technical requirements.

Additionally, when ordering a weld flange, please specify connection dimensions (pipe) and the method of welding (butt or socket weld).

When ordering blinds, please specify the following:

  • blind type (groove or tongue)
  • nominal diameter of flange, mm;
  • operating Pressure, MPa or # ANSI;
  • operating medium characteristics;
  • temperature conditions or climatic category.

All additional requirements shall be agreed with the Customer in the specification and/or the supply contract.

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

Parameter Value
Flange type Welded; blind; instrumentation
Reference ANSI B 16.5, API 6A,
GOST 28919, GOST 33259
DN, mm (inches)
от 15 (1/2) до 500 (20)
PN, MPa (kgf/cm2 )
От 5 (50) до 70 (700)

Main parameters and characteristics of spectacle blinds (spectacle flanges)

Parameter Value
Blind type as per ANSI В 16.5 Tongue, groove
DN, mm (inches)
from 15 (1/2) to 500 (20)
# ANSI
300 , 600 , 900 , 1500 , 2500

Operating medium in pipeline with flanges: oil, gas, gas condensate, water, drilling mud, their mixtures and flushing water with volume fraction of:

  • CO2 upto 6% (K1 as per GOST 13846);
  • CO2 and H2S upto 6% each (K2 as per GOST 13846);
  • CO2 upto 17% and H2S upto 27% (K3 as per GOST 13846).

Operating temperature range:

  • from minus 60 to plus 100°C for K1 pipes;
  • from minus 46 to plus 100°C for K2 and K3 pipes;
  • from 0 to plus 650C for steam boilers, steam and gas turbines and other connections as per GOST 20700.

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.:

  • design pressure;
  • min ambient temperature;
  • max operating medium temperature;
  • chemical composition and properties of the working medium and environment (corrosive, explosive, erosive contaminants).

All flanges and spectacle blinds shall be made from materials with following properties:

Strength grade
σ0,2  min.
MPa  (psi)
σв   min.
MPa  (psi)
δ5 min.
%
ψ min.
%
36К
45К
60К
75К
248 (36 000)
310 (45 000)
414 (60 000)
517 (75 000)
483 (70 000)
483 (70 000)
586 (85 000)
655 (95 000)
21
19
18
17
NA
32
35
35

Material properties of the flanges and spectacle blinds for H2S application shall meet the requirements of NACE MR 0175 after heat treatment.

OD marking shall contain:

  • manufacturer’s trademark;
  • nominal diameter;
  • working pressure (# ANSI);
  • “B 16” (for ANSI B 16.5 flanges);
  • o-ring designation as per ASME B 16.20;
  • welded element dimension;
  • material class (for API 6A flanges);
  • product specification level (for API 6A flanges);
  • drawing symbol;
  • material grade;
  • individual serial number.

OD marking shall contain:

  • manufacturer’s trademark;
  • nominal diameter;
  • working pressure (# ANSI);
  • drawing symbol;
  • material grade;
  • individual serial 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:

  • damage caused by violation of conditions of transportation, storage or pipeline connection by the customer;
  • product use for purposes other than intended and parameters and media/environments not specified in the TU specification.