Noise and Vibration Reducing STAUFF NRC Clamps

STAUFF NRC type clamps were designed for the noise and vibration reducing installation of pipes and tubes with the most common outside diameters between 6 and 42 millimetres. The working principle is based on clamp bodies made from Polypropylene following the Standard Series according to DIN 3015 (part 1) with a specially shaped, two-part elastomer insert, which mechanically absorbs vibrations in the pipe and as a result reduces noises arising to a minimum. The insert is in particular distinguished by how little of its surface is in contact with the pipe and clamp body, and as a result is far more effective than the previously known solutions.

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Buy STAUFF NRC clamps in the online shop

STAUFF NRC clamps - also known as "whisper clamps" or clamps with rubber inserts - are designed to minimise vibrations in pipelines and the resulting noise emissions. The two-part elastomer insert made of TPE achieves effective mechanical damping, which results in a noticeable reduction in noise. At the same time, the innovative design ensures a high holding force and easy installation in different systems.

Materials and surfaces

STAUFF offers NRC clamps in various materials and coatings to ensure maximum durability:

Clamp body: Made of black polypropylene (PP) for high stability and durability.

Elastomer insert: Made of TPE with a Shore hardness of 73 Shore-A for optimum vibration damping. Other degrees of hardness are available on request.

Metal parts: Optionally made of steel (phosphated or with STAUFF zinc/nickel coating) or stainless steel V2A/V4A for maximum corrosion resistance.

Special designs: Flame-retardant materials in accordance with international standards available on request.

Product variants and sizes

NRC clamps are available in different variants and dimensions:

Standard series: 7 sizes with diameters from 6 to 88.9 mm (1/4 to 3 1/2 inch).

Heavy-duty series: 6 sizes for the same diameter range.

Special versions: Also available as double, multiple or special clamps with NRC insert.

Installation options

The NRC clamps can be mounted flexibly and adapted to different installation situations. Different types of installation are recommended depending on the project and application. If you have any questions, please do not hesitate to contact us. The various options are

Direct mounting

Mounting with welding plate

Mounting on mounting rails or profile rails

Surface mounting

Applications and areas of use

STAUFF NRC clamps - also known as clamps with rubber inserts - are suitable for numerous industrial and mobile applications:

Mobile and stationary machines: Particularly in harbour and loading areas as well as municipal and commercial vehicles.

Civil shipping: Ideal for use on cruise ships, yachts and pleasure craft.

Thanks to their effective vibration and noise damping, NRC clamps contribute to increased comfort and occupational safety.

Advantages and unique selling points

STAUFF NRC clamps offer numerous advantages over conventional clamps:

Specially moulded, two-part elastomer insert: Mechanical damping of vibrations for effective noise reduction.

Minimised contact surface to the pipe and clamp body: Higher damping efficiency than conventional solutions.

Flexible pipe diameters per clamp size: thanks to the inverted tongue and groove contour of the insert.

Combination of damping and holding force: Enables secure fastening without restricting functionality.

Compatible with DIN 3015: Existing clamps can usually be easily replaced.

Special features for specific industries

NRC clamps contribute to compliance with environmental and safety standards in various industries:

Mechanical and plant engineering:

Reduction of environmentally harmful noise emissions, especially in urban areas.

Increased safety and improved communication in the workplace.

Implementation of the Machinery Directive 2006/42/EC and the Outdoor Directive 2000/14/EC.

Shipping:

More flexibility when laying noisy cables.

Increased comfort and reduced noise pollution in cabins or machine rooms.

Reduction of underwater noise as a contribution to environmental protection.

Information on the test setup in the video

The vibrations of the pipe running horizontally in the background are transmitted to a base plate via a pipe clamp in the left-hand area. An adapter plate and sensors are installed between the pipe clamp and the base plate, rigidly connecting the two components. Containers filled with liquid on the pipe and the base plate illustrate the vibrations at the respective points.

In the video on the left, a STAUFF pipe clamp in the heavy-duty series in accordance with DIN 3015 (ribbed version with pretensioning) is used. The video on the right shows a STAUFF NRC type pipe clamp for preventive vibration and noise damping.

Installation and tools

Only a few tools are required to install the NRC clamps:

Open-end or open-end spanner to tighten the screws.

Optional welding tools for fastening base plates.

Certifications and standards

STAUFF NRC clamps fulfil the highest quality standards:

Customised approvals by renowned international OEMs.

Standardised: Available for DIN 3015 (part 1) for the standard series and DIN 3015 (part 2) for the heavy-duty series.

Data sheet for NRC clamps from STAUFF

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FAQs on STAUFF NRC clamps

What materials are used for NRC clamps?

The clamp bodies are made of polypropylene (PP) in black, while the inserts are made of a special elastomer material (TPE), e.g. with a Shore hardness of 73 Shore-A . Flame-retardant materials in accordance with international standards are also available. The metal parts are available in steel (phosphated or with STAUFF zinc/nickel coating) or in stainless steel V2A and V4A.

For which diameters are the NRC clamps available?

The standard series comprises seven sizes for diameters between 6 mm and 88.9 mm (¼ to 3 ½ inches). The heavy-duty series offers six sizes with the same diameter ranges. Double clamps, multiple clamps and special clamps can also be fitted with the NRC insert.

What advantages do NRC clamps offer over conventional clamps?

The special design of NRC clamps effectively reduces vibrations and noise emissions. The two-part elastomer insert minimises direct contact with the pipe and the clamp body, which significantly improves the damping properties. At the same time, the holding force required for secure fastening is maintained.

How are NRC clamps installed?

NRC clamps can be installed in various ways, including direct installation, installation with a weld plate, mounting rail or profile rail installation and surface mounting. Depending on the mounting variant, open-end or open-end spanners and welding tools may be required.

In which areas of application are NRC clamps used?

Typical areas of application are mobile and stationary machines in harbours and loading areas, municipal and commercial vehicles travelling in urban areas and civil shipping (e.g. cruise ships, yachts and pleasure craft). They help to reduce noise emissions, increase comfort and fulfil legal requirements.

What certifications do NRC bells have?

The NRC clamps have customer-specific approvals from renowned international OEMs and comply with the relevant standards for the standard series in accordance with DIN 3015 (Part 1) and for the heavy-duty series in accordance with DIN 3015 (Part 2).

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Noise and Vibration Reducing STAUFF NRC Clamps

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