ISMT Limited manufactures High Collapse Casing Pipe. ISMT Limited offers a wide range of precision seamless tubes and alloy steel tubular products for the Bearing, Automotive, Mining, General Engineering and Energy sectors. The High Collapse Casing Pipe is a seamless tube designed to withstand high external pressures in deep oil and gas wells. The High Collapse Casing Pipe is designed to have improved collapse properties, well in excess of API requirements.