Threaded Closures

Simple, yet robust


Tube Turns® exclusive T-Bolt Closure / manway is designed expressly for low- to medium-pressure applications. It is lighter, less expensive and much more convenient than blind flanges and job-fabricated closure devices. Economical price and low initial cost are especially attractive features of the Tube Turns® T-Bolt Closure manway. T-Bolt Closures are available in horizontal (opens like a car door) and vertical (opens like a car hood) configurations.

A complete unit normally costs less than the component parts for a blind or slip-on flange combination. There need be no additional expenses for hinges, hoists, davits, etc., as the closure can be fully assembled when shipped. Furthermore, installation-labor charges are held to a minimum; a single butt weld joins the closure to the vessel, vessel nozzle, or pipe.

Compact design, light weight, and simplicity of construction and operation are keynotes of the Tube Turns® T-Bolt Closure / manway . The closure consists of a thick elliptical head hinged to a matching hub, a self-energizing O-ring and a suitable number of T-bolts to effect and maintain a tight seal. For most services, the standard materials - carbon steel and a "Buna-N" O-ring-are satisfactory. Other metals and elastomers are furnished on special request.

The T-Bolt Hinged Closure / manway is opened quickly and easily. The operator merely loosens the T-Bolts until they clear the holding lugs and allow the head to be swung open on its hinge. Complete, unrestricted access is provided; too, since the standard head stop permits a full 180° opening. Other convenient options include breakover handles and camlock wrenches that allow the T-Bolt closure / manway to be opened and sealed without tools.


Threaded Closures meet ASME Section VIII, Division I requirements. Each Threaded Closure has a pressure-warning device to alert the operator of any internal pressure in the pipe or vessel before opening the head. Also, the O-ring gasket seal is broken before the Hub/Head ACME Threads are completely disengaged which allows pressure to bleed and provides additional warning to the operator of existing internal pressure.

Operational Assurance

To assure that the Threaded Closure will consistently open and close easily, Tube Turns® applies a Flouropolymer coating on the ACME head and hub threads that provides corrosion resistance and solid film lubrication. This coating, used in combination with appropriate lubricant on the threads, assures reliable closure operation. The Pressure Warning Device is manufactured from Stainless Steel to provide corrosion protection for this safety item.

Quality Assurance

Tube Turns® Quality Control System is in accordance with the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section VIII, Division I, Appendix 10 and is audited by an Authorized Inspection Agency. ASME Code Stamping and Partial Data Reports are available at the time of order at a nominal extra cost.