TUPY Fittings Standards
TUPY products are designed and manufactured to the most respected international standards, to guarantee the highest level of quality, safety and durability across every industry they serve.
TUPY products are designed and manufactured to the most respected international standards, to guarantee the highest level of quality, safety and durability across every industry they serve.
TUPY is proud to be the only threaded fitting in the Middle East carrying a 10-year warranty, guaranteeing safety, durability and confidence on your projects. Made in Brazil, built to international standards, and trusted for generations across the Gulf and Iraq.
TUPY products are made under the strictest testing and quality control in fully equipped, modern laboratories, so that every international standard is met and what reaches you is a reliable, long-lasting product.
Mechanical tests
Pressure and leak tests
Chemical and corrosion resistance tests
Dimensional and tolerance control
Quality control and final inspection
Mechanical tests
Pressure and leak tests
Chemical and corrosion resistance tests
Dimensional and tolerance control
Quality control and final inspection
TUPY Brazil BSP threaded fittings are manufactured to ABNT NBR 6943, ISO 49 and EN 10242 and are used for the general conveyance of fluids in sizes ¼ to 6 inch: hot and cold water, steam, liquid and gaseous fuels, hydraulic oil, compressed air and gases. These fittings seal on the thread, to NBR NM-ISO 7-1.
TUPY BSP fittings are produced in blackheart malleable cast iron, grade JMB 350-10, to ISO 5922, ABNT NBR 6590 and EN 1562. The table below gives the malleable cast iron grades and the mechanical properties of each.
| Core type | Material specification | Test piece diameter d (mm) | Minimum tensile strength LR (MPa) | Minimum yield strength LE 0,2 (MPa) | Minimum elongation at 3d (%) | Brinell hardness |
|---|---|---|---|---|---|---|
| Whiteheart | JMW 350-4 | 15 | 360 | — | 3 | — |
| JMW 400-5 | 15 | 420 | 230 | 4 | 220 | |
| ASTM A 197 | 16 | 275 | 200 | 5 | — | |
| Blackheart | JMB 275-5 | 12 or 15 | 275 | — | 5 | 150 |
| JMB 300-6 | 12 or 15 | 300 | — | 6 | 150 | |
| JMB 350-10 (TUPY BSP fittings) | 12 or 15 | 350 | 200 | 10 | 150 |
| Working temperature (°C) | Maximum working pressure (bar) |
|---|---|
| −20 to +120 | 25 |
| Between +120 and +300 | Interpolated values |
| Above +300 | 20 |
One bar equals 1.02 kgf/cm² or 14.5 psi. For temperatures between 120 and 300 °C the permitted pressure is obtained from the following linear interpolation:
| Type of fitting | ⅛ to 4 inch | 5 to 6 inch |
|---|---|---|
| All other fittings | 100 bar | 64 bar |
| Unions | 37.5 bar | |
TUPY BSP fittings are produced with a black finish (oiled only) and hot-dip galvanised to ABNT NBR 6323 and ISO 1461. They are approved for drinking water networks, because the materials used in them meet the parameters of the Brazilian Ministry of Health. Other special coatings such as epoxy paint, cataphoretic (KTL), double and hybrid galvanising can be supplied on request.
Source: TUPY Brazil BSP fittings technical catalogue, pages 5 and 6.
Metallurgical specification, mechanical and physical properties, and surface coating processes for TUPY malleable cast iron fittings, taken from the official digital catalogue of the TUPY Brazil foundry.
Blackheart malleable cast iron is essentially iron, carbon and silicon. In the as-cast condition its microstructure holds the carbon fully combined. After the graphitising heat treatment (annealing), the graphite takes a compacted form in a ferritic or pearlitic matrix, tempered and drawn, with no significant eutectic carbides. This structure conforms to EN 1562, ISO 5922 and ABNT NBR 6590.
In the as-cast condition, before heat treatment, blackheart iron is simply white cast iron.
White cast iron is turned into malleable cast iron by malleablising (Maleabilização): a long process under a heat cycle of controlled temperature, time and atmosphere, until part of the combined carbon converts to graphite.
| Brinell hardness HB | Minimum elongation A-3D (%) | Minimum yield strength LE 0.2 (MPa) | Minimum tensile strength LR (MPa) | Body diameter (mm) |
|---|---|---|---|---|
| 150 | 10 | 200 | 350 | 12 or 15 |
Approximate hardness to ABNT NBR 6943 and NBR 6925.
| Property | Unit | Result |
|---|---|---|
| Modulus of elasticity | N/mm² | 175,000 to 195,000 |
| Compressive strength | N/mm² | 4× tensile strength |
| 0.2% yield strength | N/mm² | 0.5× tensile strength |
| Bending strength | N/mm² | 2× tensile strength |
| Shear strength | N/mm² | 0.9× tensile strength |
| Impact bending strength (ambient temperature) | mN/cm² | 100 |
| Property | Unit | Result |
|---|---|---|
| Density | g/cm³ | 7.2 |
| Specific heat (10 to 100 °C) | J/g.K | 0.46 |
| Thermal conductivity (10 to 100 °C) | W/cm.K | 0.42 |
| Coefficient of thermal expansion (20 to 400 °C) | °C | 12 |
| Electrical resistivity (20 °C) | Ωmm²/m | 0.3 |
| Property | Unit | Result |
|---|---|---|
| Magnetic induction at a field strength of 30 oersted | gauss | 13,000 |
| Magnetic induction at a field strength of 60 oersted | gauss | 14,000 |
| Magnetic induction at a field strength of 125 oersted | gauss | 15,000 |
| Remanent magnetism | gauss | 6,000 |
| Coercive force | oersted | 1.5 |
| Maximum permeability | gauss per oersted | 2,500 |
To confirm that casting and finishing are sound, a malleability test is carried out: after heat treatment the parts must be compressed by 10% of the outside diameter for fittings up to DN 2, and by 5% of the outside diameter for fittings above DN 2, without cracks or splits appearing on the inside. Parts with a wall thickness of more than 10 mm must not be crushed.
The carbon content of the part in the area to be welded is essentially what decides how weldable the material is. High carbon content leads to the formation of martensite and cementite and to gas pores in the heat-affected zone, and increases brittleness; the result is porous and ultimately weak welds.
Important: for these reasons TUPY does not recommend or approve welding of its fittings. The practice is common in the market, but it can cause structural damage to the parts and leakage problems in the pipework.
The main purpose of hot-dip galvanising (hot zinc coating) is to prevent corrosion of the iron. Zinc oxidises more readily than iron and so protects the base metal; hot-dip galvanising — coating iron with zinc — is probably the most environmentally compatible process there is for preventing corrosion.
Because hot-dip galvanising takes place at high temperature, the zinc and the base metal fuse together, producing a highly adherent coating that is not easily lost to mechanical damage.
After machining (thread cutting), a final protective surface coating is applied to the product; its job is to protect the fitting from corrosion while it is stored in its packaging. The oil is a water-soluble corrosion inhibitor based on white oil, intended for the temporary protection of metal surfaces. Diluted in water it forms a white, stable, long-lasting emulsion. Once the water evaporates the remaining film is thin, oily and semi-drying (semi-secative).
Electrodeposition is the most effective way of coating metal parts with a complex geometry. It is also known as e-coat, electrodip, electrophoretic painting or KTL — cathodic dip coating. The part is connected to the positive pole (anode) and the paint tank forms the negative pole (cathode).
Electrodeposition also reaches hidden surfaces and internal areas, thanks to a well-known effect called throwing power; complex surfaces are therefore coated easily and corrosion resistance improves.
Testing was carried out to the ASTM B117 salt spray test and the ASTM D4060 Taber abrasion test. This type of paint can achieve results of more than 1,000 hours of salt mist resistance (in a chamber saturated with NaCl solution mist) and a mass loss of less than 14 mg after 100 cycles.
Source: official digital BSP fittings catalogue of the TUPY Brazil foundry, pages 34 to 37 — download the full catalogue from the Download Centre
