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2. Cross-linked polyethylene - Wikipedia

   en.wikipedia.org/wiki/Cross-linked_polyethylene

   A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.

3. Push-to-pull compression fittings - Wikipedia

   en.wikipedia.org/wiki/Push-to-pull_compression...

   A push-in compression coupling and tee.. Push-to-pull, push-to-connect, push-in, push-fit, or instant fittings are a type of easily removed compression fitting or quick connect fitting that allows an air (or water) line to be attached, nominally without the use of tools (a tool is still usually required for cutting tubing to length and removal).

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Non-metallic (includes acrylonitrile butadiene styrene (ABS), fibre-reinforced plastic (FRP), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), high-density polyethylene (HDPE), Cross-linked polyethylene (PEX), and toughened glass; polybutylene has also been used, but is now banned in North America because of poor reliability)

5. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   PEX – platform express toolstring (resistivity, porosity, imaging) PFC – perforation formation correlation; PFD – process flow diagram; PFD – probability of failure on demand; PFE – plate/frame heat exchanger; PFHE – plate fin/frame heat exchanger; PFPG – perforation plug log; PFREC – perforation record log; PG – pressure ...

6. Hydronics - Wikipedia

   en.wikipedia.org/wiki/Hydronics

   The expansion tank accommodates the expanded water by further air compression and helps maintain a roughly constant pressure in the system across the expected change in fluid volume. Simple cisterns open to atmospheric pressure are also used. Water also expands drastically as it vaporizes, or flashes, into steam.

7. Turboexpander - Wikipedia

   en.wikipedia.org/wiki/Turboexpander

   A schematic diagram of a demethanizer extracting hydrocarbon liquids from natural gas. Raw natural gas consists primarily of methane (CH 4), the shortest and lightest hydrocarbon molecule, along with various amounts of heavier hydrocarbon gases such as ethane (C 2 H 6), propane (C 3 H 8), normal butane (n-C 4 H 10), isobutane (i-C 4 H 10), pentanes and even higher-molecular-mass hydrocarbons.