Duplex Straight Union
Super Duplex Union
Duplex Straight Union

FAV is the Manufacturer of Super Duplex Straight Union, Double Ferrule Compression Tube Fittings which includes Duplex Female Connector, Duplex Union, Duplex Union Tee, Duplex Union Elbow, Duplex Bulkhead Connector , Duplex Tube to Tube Union, Duplex  Male Connectors.

 

Duplex stainless steels are becoming more common. Super Duplex Straight Union, are being offered by all the major stainless steel mills for a number of reasons:

Higher strength leading to weight saving

Greater corrosion resistance particularly stress corrosion cracking

Better price stability

Lower price

 

Properties

 

The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.

Advantages

 

The advantage of a Super Duplex Straight Union,is that it combines the favourable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

UNION in OD Tube Imperial (inches)                              

PART No. 0D1 Imperial 0D F Hex A Inch Inch H mm
FCF/U/1I/DU 1/16 0.05 5/16 0.34 0.99 19.7
FCF/U/2I/DU 1/8 0.09 7/16 0.50 1.40 26.1
FCF/U/3I/DU 3/16 0.12 7/16 0.54 1.47 26.1
FCF/U/4I/DU 1/4 0.19 1/2 0.60 1.61 27.1
FCF/U/5I/DU 5/16 0.25 9/16 0.64 1.69 30.3
FCF/U/6I/DU 3/8 0.28 5/8 0.66 1.77 30.3
FCF/U/8I/DU 1/2 0.41 13/16 0.90 2.02 31.5
FCF/U/10I/DU 5/8 0.50 15/16 0.96 2.05 31.5
FCF/U/12I/DU 3/4 0.62 1-1/16 0.96 2.11 32.5
FCF/U/14I/DU 7/8 0.72 1-3/16 1.02 2.17 35.9
FCF/U/16I/DU 1 0.88 1-3/8 1.23 2.55 40.9
FCF/U/20I/DU 1-1/4 1.04 1-7/8 1.62 3.63 48.00
FCF/U/24I/DU 1-1/2 1.34 2-1/4 1.97 4.25 53.60
FCF/U/32I/DU 2 1.81 3 2.66 5.88 74.70

 

UNION in OD Tube metric (mm)

PART No. 0D1 Metric 0D F Hex A mm L mm H mm
FCF/U/2M/DU 2 1.7 10 12.9 35.6 26.6
FCF/U/3M/DU 3 2.4 10 12.9 353 26.6
FCF/U/4M/DU 4 2.4 10 13.7 37.3 27.6
FCF/U/6M/DU 6 4.8 13 41 41 27.6
FCF/U/8M/DU 8 6.4 14 43.2 43.2 30.8
FCF/U/10M/DU 10 7.9 17 46.2 46.2 31
FCF/U/12M/DU 12 9.5 20.5 51.2 51.2 32
FCF/U/14M/DU 14 11 24 52 52 32.8
FCF/U/15M/DU 15 11.9 24 52 52 0 32.8
FCF/U/16M/DU 16 12.7 24 52 52 32.8
FCF/U/18M/DU 18 15.1 27 53.5 53.5 33.3
FCF/U/20M/DU 20 15.9 30 55 55 35
FCF/U/22M/DU 22 18.3 30 55 55 36.4
FCF/U/25M/DU 25 21.8 35 65 65 41.4
FCF/U/28M/DU 28 21.8 46 85 85 43.4
FCF/U/30M/DU 30 26.2 50 92.7 92.7 43.4
FCF/U/32M/DU 32 28.6 50 97.3 97.3 51.8
FCF/U/38M/DU 38 33.7 60 113.6 113.6 58.4
FCF/U/50M/DU 50 45.2 75 145.8 145.8 145.8

 

Some Common Sizes for Duplex & Super Duplex Straight Union are

  1. FAV Super Duplex UNS 32750 Straight Union 1/4” OD
  2. FAV Duplex 2205 Straight Union 3/8” OD
  3. FAV Super Duplex 2507 Straight Union 1/2” OD
  4. FAV Duplex UNS S31803 Straight Union 3/4” OD
  5. FAV Super Duplex UNS 32750 Straight Union 6mm OD
  6. FAV Duplex 2205 Straight Union 8mm OD
  7. FAV Super Duplex 2507 Straight Union 10mm OD
  8. FAV Duplex UNS S31803 Straight Union 12mm OD
Super Duplex S32760 Fittings and Valves