Betts PAF manhole with integral 406-98 Surge Suppression Pressure Relief Valve is the proven leader for cargo tank longevity, protection and safety.
The 406-98 incorporates a 10” (254mm) reclosing pressure relief valve (PRV) that satisfies primary pressure relief for specification US DOT406 and TC406 cargo tanks. The PRV meets the dynamic pressure surge requirements of 49CFR§178.345-10(b)(3)(ii) with less than one-liter leakage as tested per TTMA RP No. 81. The PRV cover also serves as a quick-open inspection hatch that incorporates a secondary safety catch. PPVL models include a 6496 P/V normal vent.
The 20” (508 mm) clamp ring style manhole is certified and marked in accordance with 49CFR178.345-5 with a test pressure of 36 psig.
SPECIFICATIONS:
| BRAND: | Betts Industries |
| MANHOLE COVER MATERIAL: | Steel Zinc-plated |
| STRONGBACK AND LATCH: | Steel Zinc-plated |
| PRV COVER: | E-Coated Aluminum |
| GASKET MATERIAL: | Nitrile (Buna-N) |
| SET PRESSURE (PRV Designed for 3.3 psig MAWP tank): | Min: 3.63 psig; Max: 4.55 psig |
| RATED AIR FLOW CAPACITY: | 494,084 SCFH @ 6.25 psig; 294,985 SCFH @ 5psig |
| LIQUID FLOW CAPACITY: | 1,335 gpm @ 5.0 psig |
| MAXIMUM TEMPERATURE: | 212°F |
BTS Manhole 20" Center PAF-406
