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SU-III RWRT Blast & Gastight Hatch for Protected Facilities

Aug 28
4 min read

The SU-III RWRT is a top-opening blast and gastight shelter hatch designed for protected facilities and civil defence shelters. According to the published product description, the hatch is designed for blast pressure of up to 440 kPa (4.4 bar) and is intended for horizontal, top-opening installation. Atmas Group


The product is available with different clear opening dimensions and can be installed either during new construction or as a retrofit solution.


Blast pressure resistance

The SU-III RWRT is specified for blast pressure of up to 4.4 bar (440 kPa).

Blast pressure is an important engineering parameter for protective structures because a pressure wave generated by an explosion can act on structural openings and their protective elements. The hatch is designed specifically for a top-opening configuration and its stated pressure rating is 440 kPa. Atmas Group

The published specification should be considered the design rating of the product and should not be interpreted as a guarantee of protection for an entire shelter or building. The performance of a protected facility depends on the complete structural and protective system.


Top-opening configuration

The SU-III RWRT is designed for top opening.

This configuration allows the hatch to be installed horizontally and opened from above. The product description identifies the SU-III RWRT as a top-opening shelter hatch equipped with gas-lift supports. Atmas Group

Top-opening hatches are used where a protected structure requires an opening through a horizontal surface rather than a conventional vertical entrance.


Available clear opening sizes

The specified clear opening sizes are:

  • 800 × 800 mm

  • 900 × 900 mm

The clear opening is the usable passage area when the hatch is open. Selection between the available dimensions should be based on the requirements of the particular installation.


Splinter and ballistic protection

The SU-III RWRT can be equipped with optional splinter/ballistic protection using an armour plate.

This is an optional configuration rather than a characteristic that should automatically be attributed to every hatch. The additional protection can therefore be specified according to the requirements of the project.

The manufacturer/distributor's wider range of protective hatches also includes configurations designed for blast, splinter and ballistic protection. Atmas Group


Installation options

The SU-III RWRT supports two installation approaches:

  • Casting

  • Retrofit

The casting option is intended for integration during construction, while retrofit installation allows the hatch to be incorporated into an existing structure.

The availability of both approaches makes the product applicable to both new protective structures and projects involving the upgrading of existing facilities. The broader product range also specifies retrofit and casting as installation options for protective hatches. Atmas Group


Multipoint locking mechanism

The hatch is equipped with a multipoint locking mechanism with a lever.

A multipoint locking arrangement distributes the locking action across multiple points of the hatch rather than relying on a single locking point. The lever provides the operating mechanism for securing and releasing the hatch.

According to the product description, this locking system is part of the SU-III RWRT configuration and is intended to provide secure closure of the hatch. Atmas Group


Gas-tight sealing

The SU-III RWRT is equipped with a seal for gas tightness.

Gas-tight sealing is particularly relevant for protected spaces where maintaining the separation between the internal and external environments is required. A sealing system around the hatch helps reduce the possibility of gas penetration through the structural opening when the hatch is closed.

The wider range of protective hatches is also described as including products equipped with rubber seals to provide gas tightness. Atmas Group

Main technical specifications

Specification

SU-III RWRT

Blast rating

4.4 bar (440 kPa)

Clear opening sizes

800 × 800 mm; 900 × 900 mm

Opening direction

Top

Splinter/Ballistic Protection

Optional with armour plate

Installation options

Casting / Retrofit

Locking mechanism

Multipoint, lever

Gas tightness

Equipped with seal

These specifications are based on the product information supplied for the SU-III RWRT. Atmas Group


Application in protected structures

Blast hatches are structural protection components used to protect openings in shelters and other protected facilities. Their purpose is to provide a controlled and protected opening while addressing the specific threats for which the hatch has been designed.

The SU-III RWRT belongs to the category of blast hatches for shelters and protected facilities and is specifically configured for top opening. The published information identifies the product for applications associated with civil defence shelters and protected structures. Atmas Group

The complete protective performance of a facility cannot be determined from the hatch rating alone. Structural walls, roof construction, ventilation systems, doors, valves and other protective components must be assessed as part of the complete project.


Engineering considerations

When specifying a SU-III RWRT hatch, several parameters should be considered together:

  1. Required clear opening — 800 × 800 mm or 900 × 900 mm.

  2. Blast pressure requirement — up to 440 kPa according to the published specification.

  3. Installation method — casting or retrofit.

  4. Opening configuration — top opening.

  5. Optional splinter/ballistic protection — where required.

  6. Gas tightness — provided by the installed seal.

  7. Locking arrangement — multipoint locking with lever.

The appropriate configuration should be selected according to the structural design and requirements of the specific protected facility.


Conclusion

The SU-III RWRT Blast & Gastight Hatch is a top-opening protective hatch designed for protected facilities and civil defence applications. Its published specifications include a 4.4 bar (440 kPa) blast rating, 800 × 800 mm and 900 × 900 mm clear opening options, casting or retrofit installation, multipoint lever locking, optional splinter/ballistic protection with an armour plate, and a seal for gas tightness. Atmas Group

The product should be evaluated as one component of a complete protective structure, with its stated technical parameters matched to the requirements of the overall project.

Technical information on protective blast hatches: Blast Hatches for Shelters and Protected Facilities


 
 
 

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