Survey

SURVEY

SPECIALISED COMPONENTS

This is a replay of a survey carried out by Zeataline in 2014 and relates to four specialized piping components used in the energy, chemicals, and resources sectors. Surveys can be valuable for investment, business, or career planning and not only the basic questions as an insight into the demographics of disciplines and countries involved and how they shift over time is potentially priceless. This survey will run indefinitely with monthly updates.

Here are four basic questions with two option answers: From recent projects you have encountered or been involved with please select which components were or are most specified?

PRESSURE TAPPINGS

Weldoflange

One single fitting is produced from a unique single forging to replace the 2 or 3 separate components of a conventional branch assembly.

Fabricated

Generally a weldolet or reducing tee followed by a nipple and flange.

DOUBLE BLOCK & BLEED

Monoblock

These valves offer cost, time, space and weight savings.

Fabricated

Generally a short flanged spool with a small branch connection, two isolation valves and a small bleed valve.

FLANGE TYPE

Compact

Offering weight savings of up to 88% when compared to the equivalent ASME Flange. Quick and easy make-up with superior mechanical strength and fatigue performance however, relatively expensive.

Standard

ASME B16.5 or B16.47 series A and B, very heavy compared to compact flange however, have the advantage of being considered the industry standard.

WELDED BRANCHES

Pipet

Pipets: Pipets are almost unheard of outside the USA. WFI Nuclear Product inc. Houston re-engineered the olet to make them with a straight bore ID, which yields a smaller OD, for less weight and less weld and called them “Pipets”.

Weldolet

Bonney patented their olet designs back in the late 30's. When patents expired, everyone copied them. Olets have been "Unlisted Components" in ASME B31.1 & B31.3 for many years. ASME have now incorporated MSS-SP-97 into the codes to cover most of the common olet items.

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