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GALVANIISED MALLEABLE FIITTIINGS
Jun 14, 2019

GALVANIISED MALLEABLE FIITTIINGS



MATERIALS

Blackheart Malleable Iron castings.


DIMENSIONS generally to ASME B16.3 or JIS

天天捕鱼B2301, depending on manufacturing source. JIS B2301

dimensions are generally considered to be

天天捕鱼corresponding values to BS143 and BS1256, although

天天捕鱼some sizes are not exact equivalents.

THREADING is BSP pipe thread, to BS.21 (AS 1722, Part 1).

The specification for BS 143 fittings is:

天天捕鱼Taper External (Series R) Taper Internal (Series RC)

The specification for BS 1256 fittings is —

天天捕鱼Taper External (Series R) Parallel Internal (Series RP) Our stock fittings are usually BS 143 taper/taper, as

this is believed to offer superior sealing characteristics due to greater thread contact (refer illustration below).

Taper/taper threads are also being specified by increasing numbers of Gas Authorities, for the same

reason.



WORKING PRESSURES (except flanges)

天天捕鱼Recommended maximum working pressures are 1379 kPa for water and 1034 kPa for steam, air, gas and oil.

NOTE: Working pressures may also be limited by

天天捕鱼relevant Pressure Piping Codes or Industry regulations.


UNEQUAL SIZES

天天捕鱼When ordering Reducing Sockets, Nipples, Bushes and Elbows, always state largest size first —

e.g. 80 x 40 bush.

天天捕鱼When ordering 3- or 4- way fittings, the sizing sequence illustrated below should be adopted



ALTERNATIVE THREADING天天捕鱼 to special order.

NPT (API linepipe threads) Taper Internal/Taper

External can be supplied for fittings to American

specification

ANSI B16.3.

NOTE天天捕鱼: Locknuts and Plain Sockets without ribs, are

天天捕鱼supplied with parallel threads.

FINISH

Hot Dip Galvanised is the standard finish for stock.

TESTING

Fittings shall be subject to an internal hydraulic pressure of 2068 kPa without showing any sign of

天天捕鱼leakage or abnormality.


BLACK AND GALVANIISED STEEL FIITTIINGS



Screwed Steel Pipe fittings are designed for use with “Medium” and “Heavy” pipes to AS

天天捕鱼1074. These BS EN 10241 fittings are the recognised Standard for Medium Pressure

Screwed Pipework. Tubular items in this range conform to AS 1074



SPECIFICATION

BS EN 10241 Steel Threaded Pipe Fittings, Screwed BSP Thread”.

Australian Standard 1074 “Steel Tubes and Tubulars Threaded or suitable for Threading with Pipe Threads of Whitworth Form”. Australian Standard 1650 “Galvanised Coatings on Ferrous Articles”.



MATERIAL

Tubulars: These are manufactured from tubing made in accordance with AS 1074 from steel with 0.06 max sulphur and 0.06 max phosphorus.

Machined Fittings: These are manufactured to dimensions in BS EN 10241:2000 and generally made

from “Free Cutting Steel”.

FINISH

Surface Condition

天天捕鱼1. Black Steel: These fittings are generally degreased and protected with a coating of light oil.

天天捕鱼2. Zinc Protective Coating: Fittings may be supplied zinc plated using the Electrolytic Zinc Coating

process on finished Black Fittings.

3. Hot Dip Zinc Galvanising: Galvanising of fittings shall be performed before the thread cutting

operation, by means of the hot dip method.

4. Zinc Flake: Fittings may be supplied Zinc Flake Coated. This process being performed on Finished

Black Fittings.


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