quality control

Quality Control and Certifications

Quality Control

Hollis Line Machine Company practices strict quality control and testing to NIST standards for every part and product that leaves our facility. This commitment to quality is relentless and is shared by all employees of Hollis Line. Our success is based on a total commitment to the entire process, technology and the extra effort necessary to do a superior job. It is reflected in our daily operation through constant monitoring, testing and refining of all processes.

ASME Certified "U"

Hollis Line Machine Company is authorized to manufacture pressure vessels in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 and holds “U” Certificate of Authorization #32,985. Re-authorized May 2020.

Any pressure component that is designed and fabricated in accordance with the ASME standard will have a long, useful life in service. That component is also ensured to be designed and fabricated to protect both life and property.

National Board of Inspection "R"

In addition, we hold the National Board “R” Certificate of Authorization # R-5953 for repair and alteration of pressure equipment. Hollis Line Machine Company is ready to fabricate and machine a new chamber, upgrade, or repair an existing chamber.


We also manufacture in compliance to the European Pressure Equipment Directive (PED) (2014/68/EU) Hollis Line can place both a CE and ASME DATA plate on your chamber allowing its sale almost any where in the world.

Hollis Line Machine Company

Specializing in Large Part CNC Machining, Prototyping, Metal Spinning, Weldments and Assembly.

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