The PREP 4 flange facing machine is a highly versatile and precision-engineered solution designed for accurate flange facing and resurfacing applications. Building on the proven performance of the PREP 4 machine body, this machine delivers exceptional surface finish quality using a phonographic feed system. Available in pneumatic, electric, or battery (110V or 220V) drive options, the PREP 4 flange facing machine combines power, portability, and adaptability for both on-site and workshop environments.
PREP 4 Portable Flange Facer
FACING DIA. RANGE: 1.18 – 7″ / 30 – 180 mm
CLAMPING RANGE: 1 – 4″ / 23 – 112 mm
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| DESCRIPTION | PNEUMATIC – Standard | PNEUMATIC – Elbow | ELECTRIC – Standard | ELECTRIC – Elbow | BATTERY – Standard | BATTERY – Elbow |
| Version | Standard | Elbow | Standard | Elbow | Standard | Elbow |
| Part Number | HSP4PFFP | HSP4PFFPE | HSP4E110FFP / HSP4E220FFP | HSP4E110FFPE / HSP4E220FFPE | HSP4B110FFP* / HSP4B220FFP* | HSP4B110FFPE* / HSP4B220FFPE* |
| Working flange range (ID) | 1.18 – 7″ / 30 – 180 mm | 1.18 – 7″ / 30 – 180 mm | 1.18 – 7″ / 30 – 180 mm | 1.18 – 7″ / 30 – 180 mm | 1.18 – 7″ / 30 – 180 mm | 1.18 – 7″ / 30 – 180 mm |
| Clamping range (ID) | 1 – 4″ / 23 – 112 mm | 1.5 – 4″ / 38 – 111 mm | 1 – 4″ / 23 – 112 mm | 1.5 – 4″ / 38 – 11 mm | 1 – 4″ / 23 – 112 mm | 1.5 – 4″ / 38 – 11 mm |
| Idle speed | 5 – 100 rpm | 5 – 100 rpm | 5 – 82 rpm | 5 – 82 rpm | 23 / 37 / 50 rpm | 23 / 37 / 50 rpm |
| Torque | 176 N m | 176 N m | 152 N m | 152 N m | 140 N m | 140 N m |
| Length of axial feed | 5 mm | 5 mm | 5 mm | 5 mm | 5 mm | 5 mm |
| Max operating temperature | 55 °C | 55 °C | 55 °C | 55 °C | 55 °C | 55 °C |
| Max acoustic radiation | 75 dB | 75 dB | 75 dB | 75 dB | 75 dB | 75 dB |
| Pneumatic motor power | 1.35 hp | 1.35 hp | n/a | n/a | n/a | n/a |
| Air consumption | 36 cfm / 1020 l/min. | 36 cfm / 1020 l/min. | n/a | n/a | n/a | n/a |
| Air working pressure | 90 psi / 6.5 bar | 90 psi / 6.5 bar | n/a | n/a | n/a | n/a |
| Air hose connection | 1/2″ | 1/2″ | n/a | n/a | n/a | n/a |
| Electric motor power | n/a | n/a | 1300 watt | 1300 watt | 800 watt | 800 watt |
| Voltage | n/a | n/a | 110 or 220 volt | 110 or 220 volt | charger 110 or 220 volt | charger 110 or 220 volt |
| Frequency | n/a | n/a | 50 / 60 Hz | 50 / 60 Hz | charger 50 / 60 Hz | charger 50 / 60 Hz |
| Surface finish options | 63 – 250 rms | 63 – 250 rms | 63 – 250 rms | 63 – 250 rms | 63 – 250 rms | 63 – 250 rms |
| Compliance | ASME B16.5, CE | ASME B16.5, CE | ASME B16.5, CE | ASME B16.5, CE | ASME B16.5, CE | ASME B16.5, CE |
| Unit weight | 11.9 kg / 26.2 lbs | 11.9 kg / 26.2 lbs | 12.9 kg / 28.4 lbs | 12.9 kg / 28.4 lbs | 13.6 kg / 29.9 lbs | 13.6 kg / 29.9 lbs |
| Packing dimensions | 625 x 633 x 203 mm | 625 x 633 x 203 mm | 625 x 633 x 203 mm | 625 x 633 x 203 mm | 625 x 633 x 203 mm | 625 x 633 x 203 mm |
| Packing weight | 31.4 kg / 69.2 lbs | 31.4 kg / 69.2 lbs | 32.4 kg / 71.4 lbs | 32.4 kg / 71.4 lbs | 33.1 kg / 72.9 lbs | 33.1 kg / 72.9 lbs |
Our group policy is one of continuous improvement. Products and data tables are subject to change and may vary from those illustrated.
*In accordance with UN3481 regulations governing the transport of lithium batteries, this machine cannot be shipped by air. Authorized transport modes: road and sea only. Any request for air shipment cannot be accommodated. If required, alternative models without battery or charger, compliant with air transport regulations, can be offered: PART NO. HSP4BFFP (standard) / HSP4BFFPE (elbow).
Engineered to handle flat face and raised face flanges, as well as spot facing operations, the machine delivers consistent, repeatable results across a wide range of diameters and materials, including carbon steel, stainless steel, and exotic alloys. Its precision feed control system features three interchangeable feed screws, enabling operators to achieve smooth, stock, and rough surface finishes from 63 to 250 RMS to meet critical gasket sealing requirements.
The robust yet compact design makes it ideal for flange repair, pipeline and valve maintenance, and workshop flange preparation across industries including oil & gas, petrochemical, power generation, marine, and water treatment. Its heavy-duty construction ensures reliable performance in demanding environments, while its portability allows for efficient on-site deployment.
The PREP 4 Flange Facing Machine utilizes an internal collet clamping system for secure, accurate mounting, ensuring stability throughout machining. Combined with a range of standard and custom tooling options, it provides maximum flexibility for a wide variety of flange facing applications.
Additionally, H&S TOOL offers this system as a flange facing conversion kit, allowing existing PREP 4 pipe beveling machines to be easily adapted for flange facing operations, further enhancing the machine’s versatility and value.
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H&S TOOL: PREP 4 Flange Facing Machine
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