siphon loop

tekmar

on a steam boiler there is three pressuretrols  on a half inch header type deal coming of of the water column with a street 90 facing downward connecting the pressuretrol s  right now there is no siphon loop attached to the pressuretrols do i need to put loops on these or is the header doing the job of the siphon loops   low pressure boiler about 30 years old maybe 40 hp boilers   thanks

Al Letellier_21

steam pigtails

It is always a good idea to protect your pressuretrols and gauges with a pigtail. Install and add a little water before mounting the pressuretrol. This keeps the steam from coming in direct contact with the diaphragm in the control.

Charlie from wmass

That is Weil Mclains way

to not use pigtails. I do not like it but they use that instead of the siphon loop. I have often seen installations where the elbow is facing up and the header is dry. Installers error for sure. I prefer facing the elbow up and using the siphon loops with unions and the little pipe nipples that come with the header.

nicholas bonham-carter

the weil mclain way

peerless also, because they believe the syphon so obtained will be less likely to plug up, and that the extra mass of water will even out the pressure fluctuations-not!!--nbc

Charlie from wmass

I guess they forget

That psi does not care how wide of an area it is pressing on