Sturdi Pipe Chain Clamp

The Mathey Dearman Sturdi Clamp is a chain clamp ideal for schedule 40 and below pipe alignment and reforming. Originally invented in 1930, Mathey Dearman offers the Sturdi Clamp as a lighter-duty version of the Mathey Dearman Double Jackscrew pipe chain clamp.

Traditional methods for aligning heavy-wall pipe, such as ratchet cable pullers, lugs, and bottle jacks, are time-consuming and inconsistent in the results they achieve, making them unsuitable for the majority of critical alignment applications.

One clamp can fit a variety of sizes of pipes 1 – 36″ / 33.4 – 914 mm diameter, elbows, tees, flanges, end caps, and most other pipe fittings (using the level and support device purchased as an accessory). The Mathey Dearman Sturdi Clamp is available in carbon steel chain or stainless steel version. All Mathey Dearman Sturdi Clamps feature stainless steel jackscrews, jackbars, and main blocks.

The high-rise jackbars and main block provide the strength to reform the pipe on either side of the weld gap, eliminating “Hi-Lo”, whilst enabling the welder to weld the entire circumference of the pipe with the clamp in situ.

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Features and Advantages

Precision alignment – The double jackbars, spaced around the outside diameter of the pipe, provide concise alignment and reforming of the internal or external diameters of both pipes within 0.5 mm

Reformability – Reforms pipes on both sides of the weld joint to schedule 40 pipe and aligns any wall schedule of pipe, elbows, tees and other fittings

Adaptable – The chain clamp can be used to align and reform elbows, tees, and other fittings that a cage clamp can not manage. One chain clamp covers the range of eight cage clamps

High-rise independent jackbars – Double jackscrew ‘high-rise’ jackbars have extra clearance, enabling easy access with welding torch/rod. Each jackscrew has independently pivoting feet to cope with uneven surfaces

Wide range – One chain clamp covers a wide range of pipe sizes

Safe – Elbows, tees, and other fittings can be held safely and securely in place during alignment with the level and support device

Sturdi Clamp pipe chain clamps versatility

Some examples of fit-ups with the Sturdi Clamp. Each clamp is supplied with all accessories to carry out any fit-up and includes a steel storage box.

Mathey Dearman Sturdi Clamp includes:

  • Nickel-plated carbon steel or stainless steel duplex roller chain
  • Stainless steel single or double jackscrew jackbars – quantity as indicated in specifications
  • Stainless steel main block
  • Jackscrew breaker bar and socket
  • Heavy-duty storage box
  • Parts and operating manual

Mathey Dearman Sturdi Clamp Chain Clamp

PART NO. NO OF JACKBARS PIPE SIZE RANGE REFORMS/ALIGNS PIPE TO SCHEDULE* JACKBAR MODEL MAIN BLOCK MODEL CHAIN MODEL
D250-SC 4 1 – 12″ / 33.4 – 323.8 mm 40 / 80 DA-600S DA-100 DA-300
* D250-SCSS 4 1 – 12″ / 33.4 – 323.8 mm 40 / 80 DA-600S DA-100 DA-300S
D249-SC 7 4 – 20″ / 114.3 – 508 mm 40 / 80 DA-600S DA-100 DA-300
* D249-SCSS 7 4 – 20″ / 114.3 – 508 mm 40 / 80 DA-600S DA-100 DA-300S
* D235-SCSS 8 10 – 36″ / 273 – 914 mm 40 / 80 DB-600S DB-100 DB-300S
* D236-SCSS 13 10 – 54″ / 273 – 1,372 mm 40 / 80 DB-600S DB-100 DB-300S
* D237-SCSS 16 10 – 72″ / 273 – 1,827 mm 40 / 80 DB-600S DB-100 DB-300S
* Suitable for stainless steel

The Sturdi Clamp does not include a level and support device – these can be purchased as an accessory. Calculations are based on a pipe with a tensile strength of 45,000 lbs per square inch (3,168 kg per square centimeter)

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