The question comes up, what’s the difference between a PFQ and a PFP? There’s several differences that you’ll see. The one on the right, that is my right, is a PFP. If you notice, the bezels are different. The bezel on the PFP is what we call a bayonet bezel. The bayonet bezel can be removed, that allows for recalibration, repair of the gauge. Also, you’ll notice that, if this was an all stainless steel version, it will, in the future, be welded, but you’ll notice the PFP has a socket that’s laser welded to the case. That’s important because, unfortunately, when people install gauges, though they should always use a wrench on the flat when they install it, some people forget the wrench and they use their hands. If this wasn’t welded, that would create a lot of torque, it can bend the dial, pop the pointer off. But because the socket is welded to the case, it eliminates a leak point, it’s a one piece socket, and now, if someone does use the gauge case to install it, there are less chance of damaging the gauge by doing that. Because remember, MPT threads are a friction thread, pipe thread, so you have to tighten it down till it finally binds so that it will not leak anymore.
If we look at a 4 inch PFP, then you’ll see a significant difference because here is the PFQ and the PFP. If you look at them side-by-side, you can see just the heftiness of the PFP is much greater. It uses a full-sized movement and board on tube, the accuracy of the PFP is 1% full-scale, the accuracy of the PFQ is 1.5% full-scale, so there’s definitely a difference. If you have a process that’s seeing a lot of pulsation, vibration, aggressive media, the PFP would probably be the better choice because it’s built to stand up to that rigorous application that you’re going to see either in the upstream or the downstream processing market.
This also shows you that the PFP comes standard on the 4 inch with what we call a blowout back. That’s important because, even though it’s not what we call a safety case, it does have the ability that, if the board on tube was to fail, this plug would blow out the back thus the operator would be protected. If you were standing in front of it, the plug blows out the back, this provides that safety relief out the back and not coming towards the operator.
Another feature of the PFP is that it has a ventable plug. We talked about PFQs before, and they will have it also, but to vent his gauge, you just take the plunger and you pull it up. When you pull it up, now it’s vented so it’s going to let any entrapped air out. Once you’re done venting it, because especially if you have some pulsation going on and it’s shaking, you don’t want the liquid to migrate out. Once it’s vented, you can push it back down.
It’s easy to tell if a Winters gauge is vented or not because if the plunger is up, it’s in a vent position. If it’s pushed down, it’s closed. Some of our competitors have a lever. The problem is you have to go physically look at the top of that page to see if it says open or closed, so that’s an advantage of the Winters product.
Again, the PFP definitely is a step up from the PFQ. It’s generally all stainless steel, heavy-duty, and again, the socket is always welded to the case.
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We perform Military POL work on Guam. Many materials are not readily available. Trupply have a fantastic inventory which makes shopping for unusual items easy. I do wish they would ship direct to Guam, and we would purchase a lot more from them.