RY-SAR-04 Explosion-Proof Electric Long Tube Respirator for Four Persons with Four Hose Outlets

Product Overview

The RY-SAR-04 is a four-person electric long-tube respirator: one stainless steel blower housing with an explosion-proof motor feeds four outlets, four long corrugated hoses, four full-face masks with yellow frames and four waist straps. The explosion-proof certificate, test report and manual come with the set. It is the largest standard configuration in this range and is used where a crew of four has to work inside the same large classified or contaminated volume from one access point — a coating gang inside a storage tank, a lining crew, or an inspection team working a vessel in rotation.

Four Masks on One Blower: The Case For and Against

There is a real argument for this configuration. One blower, one power feed and one intake means one place to guard, one start-up check and one shutdown procedure, and the whole crew breathes from air drawn at a point that a single attendant can watch. On a large vessel that is easier to control than four separate units with four intakes scattered around the site.

The argument against is risk concentration, and at four wearers it becomes the dominant consideration.

The flow is divided four ways. Whatever the blower delivers is shared, so each mask sees roughly a quarter of it, and the share shifts as masks are connected and disconnected during the shift. Unequal hose lengths make it worse: the shortest run takes the most, and the wearer on the longest hose is the one who will not notice until they are breathing hard. Measure at the farthest mask with all four connected, and treat that reading — not the blower's free-air figure — as the working number.

One failure strands four people. A stopped blower, a lost power feed or an intake swallowed by a plume removes protection from all four at once. Getting four wearers out of a vessel is a team rescue: it needs a rescue party, not a single standby attendant, and it needs a route wide enough for four people moving at once with hoses trailing behind them. Many sites that can support one entrant cannot support four on a single air source, and the honest answer for them is two smaller units, so a single failure strands two rather than four.

The hoses become the constraint. Four long hoses fill the access way and the working volume, cross at the entry and pull on each other's masks. With four wearers the hose bundle is a job in itself: marked routes, a stated working position for each person, and one person at the entry whose only task is managing the bundle.

Four faces, four masks. Every mask is fitted, cleaned and stored to its own wearer; sizes will differ and the masks are not interchangeable spares.

The two constants hold at any headcount: the blower moves ambient air rather than making it, so the intake must stand in clean air, upwind and outside the zone; and none of the four has an escape cylinder, so any interruption means all four leave immediately.

Key Features

• Single explosion-proof blower with four hose outlets, feeding four masks from one power feed and one start-up check.

• Stainless steel blower housing with carry handle, resistant to wash-down and to most process atmospheres.

• Four long corrugated breathing hoses with quick-fit couplings, coiled for transport.

• Four full-face masks with yellow frames, wide visors and exhalation valves.

• Four waist straps, one per wearer, keeping hose weight off the facepieces.

• Explosion-proof certificate, test report and manual supplied with the set.

• Mains-powered with plug and cable; no cylinders and no charging between shifts.

• One guarded intake for the whole crew, rather than four intakes to control around the site.

• Packs as a single kit with all four hoses deployed from one point, so entry and hose flow are controlled from the blower position.

Technical Specifications

Deployment and Use

1. Site the blower in clean air, upwind and outside the zone, confirm the gas group and temperature class against the zone, and keep the certificate at the blower position.

2. Lay out the four hoses on separate marked routes, appoint one person to manage the bundle at the entry, and keep the access clear for a four-person exit.

3. Fit each mask to its own wearer and fit check all four before anyone enters; record who wears which mask.

4. Connect the masks one at a time with the blower running, then measure the flow at the farthest mask with all four connected and record the reading on the permit.

5. Confirm the rescue plan physically covers four wearers — a rescue party, not one attendant — before the first entry, and brief the signal for loss of air.

6. Make it a rule that all four leave on that signal without waiting for confirmation, and rehearse the exit once on the first entry of a campaign.

Maintenance

Before each use: inspect all four hoses for cracks, flattening and damaged couplings; check every mask, gasket and exhalation valve; run the blower and confirm airflow at each mask.

After each use: clean and disinfect each mask separately, wipe and coil the hoses without sharp bends, and check the cable and plug.

Monthly: inspect the intake and fan for dust, check earth continuity and the cable gland, and confirm all four outlets and couplings are sound.

Annually: have the explosion-proof enclosure and motor inspected by a competent person, replace all mask gaskets and exhalation valves, and re-check the certificate against the zone if the process has changed.

Standards and Compliance

This is a supplied-air respirator: it does not generate oxygen and must not be used in an oxygen-deficient or immediately dangerous to life or health atmosphere unless the intake air is guaranteed clean and the assessment says so in writing, and it must never replace self-contained apparatus where an escape supply is required. Each mask must be fit tested to its own wearer and must not be shared without cleaning and disinfecting. The blower, hoses and masks are assessed as one system: four outlets must be shown to deliver adequate flow to all four masks simultaneously, not in turn. Local rules on confined-space entry, permit-to-work, maximum number of entrants and standby arrangements apply on top of the equipment, and the certificate supplied with the set must be kept with the unit and produced at inspection.

Applications

Coating and lining gangs working large tanks and vessels from one access point, inspection crews rotating inside a vessel, solvent and chemical work in classified areas with a four-person team, and sites where a single guarded air intake is preferred to four separate blowers.

Ordering

State the model RY-SAR-04, the length of each hose, the supply voltage and phase, the zone classification and required gas group and temperature class, and the mask size for each wearer. Confirm whether spare hoses, additional masks or a hose reel are to be included, and state the language required for the manual. Ask for copies of the explosion-proof certificate and test report in advance if they are needed for a permit submission. Before choosing four masks on one blower, confirm that the site's rescue plan can bring four wearers out; where it cannot, two smaller units are the safer specification.