The TUPY Brazil union (figure 340) is a three-part fitting that lets a line be broken and remade without turning the pipe.
| Figure number | 340 |
| Size range | 1/4in to 6in |
| Finish | Galvanised and black |
| Thread | BSP |
| Standard | EN 10242 / ISO 49 |
| Maximum working pressure | 25 bar |
| Material | Malleable cast iron |
TUPY Brazil fittings are manufactured and inspected under the supervision of the international bodies above, and carry recognised approvals for use in fire protection, water and gas networks.
The dimension letters follow the technical drawing above. Weights are per single fitting, in kilograms.
| Nominal diameter | Dimensions (mm) | Weight (kg) | Pieces per carton | |||||
|---|---|---|---|---|---|---|---|---|
| inch | mm | a | z | s | s1 | Galvanised | Black | |
| 1/4" | 8 | 42 | 22 | 31 | 16.50 | 0.096 | 0.092 | 150 |
| 3/8" | 10 | 45 | 25 | 36 | 20 | 0.125 | 0.115 | 110 |
| 1/2" | 15 | 48 | 22 | 40 | 25 | 0.180 | 0.181 | 60 |
| 3/4" | 20 | 52 | 22 | 49 | 31 | 0.282 | 0.277 | 50 |
| 1" | 25 | 58 | 24 | 55 | 38 | 0.389 | 0.383 | 40 |
| 1.1/4" | 32 | 65 | 27 | 69 | 48 | 0.641 | 0.625 | 25 |
| 1.1/2" | 40 | 70 | 32 | 74 | 54 | 0.745 | 0.709 | 20 |
| 2" | 50 | 78 | 30 | 90 | 68 | 1.132 | 1.096 | 12 |
| 2.1/2" | 65 | 85 | 31 | 109 | 84 | 1.782 | 1.703 | 8 |
| 3" | 80 | 95 | 35 | 129 | 97 | 2.607 | 2.405 | 6 |
| 4" | 100 | 110 | 38 | 149 | 121 | 3.275 | 3.187 | 3 |
Source: the official TUPY Brazil BSP threaded fittings catalogue.
Need pricing for this fitting?
Send us the figures and sizes you need and our Dubai office will come back with a quotation, stock position and lead time.
The union is made up of three parts: two halves that screw onto the two pipe ends, and a nut that pulls them together. Its advantage is that no pipe has to be turned in order to separate the line.
Wherever a piece of equipment has to be serviced or replaced — a pump, a valve, a filter, a meter — a union is fitted on each side of it. Without one, changing a valve means dismantling the whole run back to the nearest fitting that can be separated.
The seal in a union is made on the seat, not on the thread. On the conical seat type (figure 340) two conical metal faces bed onto one another; the machining accuracy of those two faces decides whether the joint still seals after being broken and remade several times.
Malleable cast iron with a BSP thread to EN 10242, galvanised and black.
The TUPY Brazil Union is made in 11 sizes, from 1/4" to 4". The full list of sizes, with the dimensions in millimetres and the weight of each piece, is in the dimensions and weights table on this page.
The weight depends on the size: the 1" size, for example, weighs 0.389 kg galvanised and 0.383 kg black. The weights of every size are taken from the official TUPY catalogue and are listed in the table on this page, so they can be used to work out shipping weight and freight cost.
TUPYBSP fittings are threaded to BSP in accordance with ISO 7-1; the male thread is tapered and the seal is made on the thread itself. BSP is not interchangeable with NPT, and screwing the two together will leak. TUPY also produces a separate NPT line, which is covered in the downloads section.
A socket is a permanent joint: to undo it the whole line has to be unscrewed. The figure 340 union is made of three parts, and undoing the centre nut separates the line without moving the pipework. That is why one is fitted before and after valves, pumps, meters and any equipment that needs periodic servicing. The design pressure of a union is 37.5 bar.
According to TUPY's technical catalogue, the working pressure of TUPYBSP fittings is 25 bar between −20 °C and +120 °C. It falls to 20 bar above 300 °C, and intermediate values are interpolated. The design pressure in the hydrostatic test is 100 bar for sizes up to 4 in and 64 bar for 5 in and 6 in.
The TUPY Union is manufactured to EN 10242 / ISO 49. TUPY malleable cast iron fittings are built to ISO 49, EN 10242 and ABNT NBR 6943, and their threads follow ISO 7-1. The factory certificates can be seen in the standards and certifications section on this page.
On the body of every genuine TUPY fitting the factory mark, the figure number and the size are raised in the casting, not etched or printed. The threads are clean and free of burrs, and the galvanised coating is even. The surest check is to weigh the piece and compare it with the weight table on this page; counterfeit pieces usually come out lighter than the official catalogue weight.
Use the request a quote page at /request-a-quote and tell us the figure number (340), the sizes and the quantities you need. Our Dubai office will come back with a quotation, the current stock position and a lead time. Amini Building Materials Trading L.L.C is the exclusive agent of TUPY S.A. in the Middle East and supplies the region from Dubai.
A union seals on its seat, not on the thread. The seat type therefore decides how often the joint can be broken and remade, how much angular misalignment it will take, and which duty it suits.
| Size (in) | Minimum sealing torque (N·m) | Size (in) | Tensile strength (kgf) |
|---|---|---|---|
| ⅛ and ⅜ | 65 | ½ | 3,487 |
| ½ to 1 | 125 | 1 | 7,026 |
| 1¼ and 1½ | 185 | 1½ | 11,706 |
| 2 to 3 | 245 | 2 | 13,603 |
| 4 | 300 | 3 | 18,141 |
| 5 | 700 | 4 | 22,678 |
| 6 | 800 | 6 | 35,434 |
Source: TUPY Brazil BSP technical catalogue, pages 20 and 21.
