SIST EN 3245:2004

SIST EN 3245:2004 is the Slovenian adoption of EN 3245:2001, published as a European Standard by CEN. It specifies straight reducer unions for 8°30' pipe couplings in titanium alloy for aerospace applications, including the dimensions, materials, lubrication, marking and technical specification needed to identify and use the part.

What does SIST EN 3245:2004 specify?

SIST EN 3245:2004 specifies straight unions reducer for pipe couplings 8°30' in titanium alloy for aerospace use. The scope ties these fittings to a nominal pressure up to 28 000 kPa and a temperature range from -55 °C to 135 °C, which tells users the service envelope the part is intended to meet.

The document is organized into six clauses: Scope, Normative references, Required characteristics, Designation, Marking and Technical specification. Figure 1 shows the configuration and key dimensions, and Table 1 gives the size codes, thread combinations, lengths and mass.

What are the key requirements of SIST EN 3245:2004?

SIST EN 3245:2004 bases acceptance on the configuration in Figure 1 and the dimensions and mass in Table 1. Dimensions not specified there are left to the manufacturer only if the qualification and acceptance requirements of EN 3275 type II are met. In practice, that means the part must match the standardized geometry, while any undeclared detail still has to pass the linked technical specification.

Dimensions, roughness and materials

SIST EN 3245:2004 says the listed dimensions apply before lubricating. Surface roughness follows Figure 1 unless the design documentation states otherwise. Materials must conform to EN 3311 or EN 3314, so procurement and machining have to start from the designated titanium alloy bar condition.

Surface treatment and lubrication

SIST EN 3245:2004 requires lubrication according to EN 2491 on the threads and sealing faces. Before the lubricant is applied, the surface must be abrasive blasted with non-metallic grit, and the lubricant film thickness is controlled between 0,005 mm and 0,013 mm. In practice, the surface preparation and coating process are part of the product definition, not just a shop practice.

Designation, marking and technical specification

SIST EN 3245:2004 uses the designation block UNION, REDUCER followed by the standard number and the code from Table 1, with code I9005 inserted if needed. Marking follows EN 2424, style A, with the marking area shown in Figure 1. The technical specification is EN 3275 type II, which is the basis for qualification and acceptance.

What terms does SIST EN 3245:2004 define?

• MJ threads - The metric aerospace thread form used for the fittings, with limit dimensions given by ISO 5855-3.
• Union, reducer - A straight fitting used to join pipe ends of different nominal outside diameters.
• EN 3275 type II - The technical specification type that governs qualification and acceptance for this fitting.
• EN 2424 style A - The marking style required for aerospace products under this standard.
• Sealing faces - The faces on the fitting that must be lubricated to support the joint seal.
• Non-metallic grit - The abrasive medium used to prepare the surface before lubrication.

Who uses SIST EN 3245:2004?

SIST EN 3245:2004 is used by aerospace designers and fluid-system engineers who specify pipe fittings for titanium alloy tubing. Buyers and suppliers use it to order and manufacture the correct reducer union from the coded sizes and material options. Quality and inspection teams use it to check dimensions, surface condition, marking and the linked EN 3275 type II requirements.

What changed in SIST EN 3245:2004 from the previous edition?

SIST EN 3245:2004 corresponds to EN 3245:2001.

Which standards are used with SIST EN 3245:2004?

What does the SIST EN 3245:2004 document contain?

SIST EN 3245:2004 contains one figure and one table that define the reducer union geometry, thread ends, marking area, codes and masses. Table 1 links thread combinations to size codes, lengths and mass per piece. Figure 1 shows the configuration and the across-flats and thread-related dimensions needed for manufacture and inspection.

The clauses also set out how to designate the part, how to mark it and which technical specification applies for qualification and acceptance. That makes the standard usable for design review, purchasing, machining and incoming inspection.