Drain gauges

TAPPED CONNECTIONS VENT - DRAIN - GAUGE 53 PRESS. PSIG T,°F... 

Vents, Drains, Gauge, or Sample Port Failures—Small diameter piping or valves may be opened or fail which releases vapors or Hquids to the environment unexpectedly (e.g., level gauge sight glass breaks). Normal Operational Releases—Process storage or sewer vents, rehef valve outlets, tank seals, flare, and burn pit disposal systems, which are considered normal and accepted releases to the atmosphere. 

Fig. 4. Diagram of a hoUow-fiber ultrafilter filtration system where A corresponds to the retentate reservoir B, circulation pump C, pressure gauge at module inlet D, ultrafilter module E, permeate reservoir F, pressure gauge at module outlet G, value to control module outlet pressure and H, drain...

Pressure gauges should be provided at the diseharge of the pumps, the bearing header, the eontrol oil line, and the seal oil system. Eaeh atmospherie oil drain line should be equipped with steel nonrestrietive bull s-eye-type flow indieators positioned for viewing through the side. Viewports in oil lines ean be very useful in providing a visual eheek for oil eontamination. 

For gauge glasses, it is good to have a vent at the top as well as a drain at the bottom. These should be inline for straight-through cleaning. 

When a boiler may not be shut down for maintenance of the level control chambers isolating valves can be fitted between the water-level control and the steam space. In this instance, the valves must be capable of being locked in the open position and the key retained by a responsible person. When these valves are closed during maintenance periods the boiler must be under manual attendance. Fitting of these valves should only be with the agreement of the insurance company responsible for the boiler. Drains from the water-level controls and level gauges should be collected at a manifold or sealed tundish before running to the blowdown vessel. 

Auxiliaries are additional boiler fittings that provide controls for ease of operation. They may include additional valves (such as check valves on feed lines, nonreturn valves on steam distribution lines, and the various boiler system drain valves), gauges, connections, and devices to regulate FW, air, and fuel and to provide for the efficient production, pressure, temperature, quality, and flow of HTHW or steam. 

Heavy-gauge brass traps are also available, sometimes on special order. They deliver quite good service. For most uses, however, plastic drain systems seem to work best. 

Water is drained off the boot to maintain an interface level between water and hydrocarbon in the boot. These interface level controllers, especially on reflux drum water draw-off boots, are typically set locally. The operator finds the visible interface level in the boot s gauge glass, and then sets the local interface level controller, to hold the level half way down the boot. Level taps in the lower portion of any vessel, tend to plug. This is especially true with the level taps in water draw-off boots. You need to blow out these taps on some frequent basis, because a high boot interface level can push water into the tower s reflux pump. 

Fig. 12. Schematic diagram of the experimental set-up for plastisol moulding into thin flat moulds 1 — loading of raw materials 2 — damper 3 — pump unit 4 — plunger 5 — discharge tube 6 — inlet channel (round runner) 7 — metallic bottom half mould 8 — top half mould (of lucite for low-temperature moulding and of steel for moulding into hot mould) 9 — pressure gauge 10 — stub tube for control 11 — drain cock 12 — conical flat tube instead of round point runner bolts for controlling the width of forming cavity within the limits of 0.15-1.5 mm...

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