Short spool pieces?
Short spool pieces?
(OP)
We're about to replace qty 16 old magmeters with new ones. However the new ones have a shorter lay length leaving a 6.25" gap from old to new in our 20" lines. 55 PSIG water service, ambient temperature,
150# flanges.
Having custom spool pieces manufactured is looking expensive and standard rubber expansion joints typically have a free length of 8 inches.
Any easy solution?
Thanks, Dave
150# flanges.
Having custom spool pieces manufactured is looking expensive and standard rubber expansion joints typically have a free length of 8 inches.
Any easy solution?
Thanks, Dave





RE: Short spool pieces?
I thought you could put in a wafer check (without the flapper) to fill the gap, but the ones I've found are 8.625 inches thick.
What you could do is make a spacer piece that fits between the flange gaskets like a wafer check would, but is 6.25 inches thick. It won't be cheep, but no solultion in 20-inch is going to be cheep.
David
RE: Short spool pieces?
an extension of zdas04's thinking. Sure as hell beats having a custom piece machined and this is perfectly suitable for the service.
A question properly stated is a problem half solved.
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RE: Short spool pieces?
Paddle spacers have standard lengths, but custom lengths are not unheard of. Maybe not 6x the standard lay length... but it's possible I suppose.
- Steve Perry
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RE: Short spool pieces?
RE: Short spool pieces?
As previously mentioned, making it yourself could be much easier, the only possible issue with this is getting the required approvals for it (if necessary). Bodging bits together, although functional, may lead to a lot of hassle in the long run regarding conformance etc.
RE: Short spool pieces?
donf
RE: Short spool pieces?
6.25 inch gap - 2x 0.125 gaskets = 6.00 gap.
5.60 weld neck flange length + slip-on flange (over the weld neck) with a 3/8 weld margin under the slip-on flange for the internal slip-on weld = 5.975
Since you need 16x "spacers," make a bench jig clamping both end flanges so they are perpendicular to the center line and have a proper (2-bolt) hole alignment for the bolts.
The slip-on flange, at just over 2 inches long itself, might be the only thing giving you a problem: The slip-on flange may jam against the increasing OD of the weld neck flange, requiring you to trim the weld neck slightly. Going to depend on manufcturing tolerances there. However, at 55 psig water service, stresses will be very, very low for a 3/8 thick (minimum) fitting wall.
RE: Short spool pieces?