About the malleable iron pipe fittings technical information

2018-06-26 11:38:48 News

Material,Threads,Finish,Pressure-Temperature Ratings,Standard Packing,Wall Thickness & Tolerances,Gas Soundness,Hydrotesting

  1. Material

ST Brand Pipe Fittings are made of black heart malleable cast iron as per IS 2108/ now IS: 14329-95

  1. Threads

ST Brand class 150 plain pipe fittings:
IS 554 BS 21 and BSPT & NPT as per ANSI B2.1
Banded ST pipe fittings available in BSPT & NPT Thread.

  1. Finish
    Galvanized as per IS 4759
  2. Pressure-Temperature Ratings

Pressure-Temperature ratings are shown in the following tables:

Standard Class 150, Fittings and Unions
Fluids Temperature Maximum Working Pressure
Water, Non Shock Pressure 250oF/120oC 300psi / 20 kg/cm2
Steam, Air, Gas, Oil and Water 400 / 200 200 / 14
Steam, Air, Gas and Oil 570 / 300 150 / 10
  1. Standard Packing
NUMBER OF PIECES PER BAG
S. No. ITEMS 1/2″ 3/4″ 1″ 11/4″ 11/2″ 2″ 21/2″ 3″ 4″
1. ELBOWS 500 400 250 150 110 60 40 25 12
2. TEES 400 250 170 100 70 40 25 15 8
3. UNIONS 300 200 160 100 80 50 30 20 10
4. SOCKETS 800 600 400 250 150 100 70 40 20
5. PLUGS 1000 1000 800 500 300 150 110 70 40
6. HEX NIPPLES 800 500 400 250 175 125 70 40 20
7. CROSSES 300 225 140 70 50 45 45 45 45
8. THREE WAY ELBOWS 400 300 200 100 70 45 45 45 45
9. FOUR WAY TEES 300 200 110 70 50 45 45 45 45
10. G.I. BENDS 300 200 150 65 50 30 20 10 6

  1. Wall Thickness & Tolerances
Size Designation 1/2″ 3/4″ 1″ 11/4″ 11/2″ 2″ 21/2″ 3″ 4″ 5″ 6″
Thickness in mm 2.5 3.0 3.0 3.5 3.5 4.0 4.5 5.0 6.0 6.5 7.5
Tolerances in mm +0.5 +1.0 +1.0 +1.0 +1.0 +1.5 +1.5 +1.5 +2.0 +2.0 +2.0
-0.5 -0.7 -0.7 -0.7 -0.7 -0.7 -1.0 -1.0 -1.0 -1.0 -1.0
  1. Gas Soundness

Banded Pipe Fittings for gas are made in BSPT or NPT thread & are individually tested fully immersed in water at a Pneumatic Pressure of 15 kg/cm2/200 PSI.

  1. Hydrostatic test

Plain Pipe Fittings for water are hydrotested at 20 kgm/cm2聽as per sampling plan for a particular batch of fittings.

Note :聽聽Also available as per IS Standards, British Standards (BS), American Standards (ANSI).

Malleable Iron Pipe Fittings
Malleable Iron Pipe Fittings