Going from single tank with 117 cu ft steel with 19 cu ft pony, 6 lb plate, I had 23 extra lbs. With double 110 cu ft steel, 6 lb plate, I have about 20. But I'm still fine tuning it.
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I was bored at some point and weighted a lot of dive gears. Here is what I can share. Photos can be post upon request:
1. brass din first stage, MK25 and Atomic M1 in this case, ~1.35lb.
2. Thermo single pro valve: 1.5lb each
3. Thermo 230bar manifold: 4.9b total. => Cross bar along is 1.9lb only
4. Highland 2.5" wide, 7.25" diameter band set: 3.9lb
5. Most stainless steel plate quoted for 6lb is actually just above 5lb. DR SS plate: 5.06lb.
So adding a x-7 HP100, that is -2lb. Adding a 1st stage: -1.35lb. Added cross bar: -1.9lb. Adding bands: -3.9lb. Total is just a bit over 8lb. Assuming you are not changing your plate, you can subtract 8lb from your weight belt. It is inline with my own experience.
All,
Just trying to get a rough idea of what to expect going from single steel to double (yes I know the whole story of doing a weight check...etc. just looking for a place to start). Currently in fresh water cold diving with drysuit I wear 15lbs lead, steel backplate (6lbs) with steel cambands(not plastic...add probably 1lb negative), and a STA (2lbs) along with a Faber FX 100 (which is about -.5lbs empty). I will be going to double tank Worthington x7-100 which are a bit more negative compared to the Faber FX100s. How negative are a typical manifold and tank bands? I know I will add another reg set so that may be another say 2-4lbs negative as well. Any thoughts and considerations to get me a ballpark. I will be doing the proper weight check when I get to the water, just want an idea of where I might end up. Thanks!
Most "Medium" or "Standard" SS plates are right around 5 lbs, the harness however, adds ~ 1 lbs too. Particularly if a quality heavy gauge waist buckle is used. I quote 6 lbs for a SS plate and harness.
Modular tank valves tend to be heavier than conventional single tank valves. A pair of modulars + an Iso Bar adds 3-4 lbs more than a pair of non modular valves.
Tobin
Maybe in your part of the world, but definitely not in my part of the world. As a rough estimate, I'd guess that perhaps 30-40% of my active clubmates use rec doubles, and the most common type is probably the D8.5Lx232bar. That's far from enough gas for a deco dive, but an nice amount for a cold water rec dive in a DS. For deco diving, I'd say that the most common twinset around here probably is a D12Lx232bar.Doubles implies staged deco
Maybe in your part of the world, but definitely not in my part of the world.
I have more weight numbers:
- H small plate by itself is 4lb-1.9lz (or ~4.1lb)
- Same plate with full DIR style harness, including crotch strap, knife sheav, but not knife is 6lb-0.3oz. => the full harness is 1lb-14.4oz (~1.9lb). That is with 2 stainless steel buckle, 5-ring harness, 2 2-ring crotch strap.
If that's what you really meant, I'd probably limit my statements a bit from the beginning if I were you.Er, ah, well, if you read the OP you will see he is 1) in New York and 2) planning on 2 x 100 cu ft tanks.