Here are five questions asked and answered about the TDW D-500 Threaded Closures.

1. What are D-500 Threaded Closures?
They are a newly-introduced line of easy installation, quick
access closures for use on pig traps, filters, strainers, scrubbers,
heat exchangers, blowdowns, and many other types of vessels.
They operate in fluids such as natural gas, refined products, water
and crude oil.
Do these closures offer specific advantages?
Yes. The doors are easily opened and closed with standard tools,
requiring no special tools or hammering. A large cross-section
O-ring on the barrel collar maintains a positive seal. The closures
feature a pressure warning lock to alert the operator to internal
pressure prior to opening the door. For added safety, the primary
door seal is released before the threads are completely disengaged.
What sizes are available?
D-500 Threaded Closures are available in sizes 2- through
14-inch, and in several configurations. Sizes 2- through 8-inch
without hinges are standard, as are sizes 10- through 14-inch
with horizontal hinges.
What if other configurations are needed?
Horizontal hinges on 4- through 8-inch closures and vertical
hinges on 4- through 14-inch closures are available as special
orders. All closures are shipped with material test certifications
upon request.
What other pigging products does TDW offer?
TDW also designs, engineers and fabricates complete pigging
systems that include launchers, receivers, closures, handling
equipment, skids, pig passage indicators, launch pins, valves and
piping, pigs, and spheres. These systems are offered in standard
designs or can be built to customer specifications. l
Below we are answering a handful of questions about one of the innovative
products or services offered by T.D. Williamson.
on D-500 Threaded Closures
For more information, visit www.tdwilliamson.com and navigate to Pigging Products.