Fireproof Enclosures Installation
Date: Monday, October 03 @ 10:03:18 CDT
Topic: FireProofing


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Fire Proof Enclosures™ are designed to meet the requirements of the UL 1709 Rapid Rise Fire Tests of Protection Materials for Structural Steel. Specifically Fire Proof Enclosures™ are designed to meet these test criteria for either 30 or 60 minutes. The 30-minute rating is applied to the standard 2” thick enclosure; the 60-minute rating is applied to the 4” thick enclosure. Fire Proof Enclosures™ are selected to provide fire protection of Valves, Actuators, Instrumentation, Pumps, Heat Exchangers, and other Critical Process Control Equipment. Fire Proof Enclosures™ eliminate available flame paths and insulate the protected equipment from the heat of the fire to accomplish protection.

Fire Proof Enclosures™ are custom designed removable Passive Fire Protection enclosures. They are manufactured in a proprietary process that allows refractory material to be captured, compacted and formed into the SS framework, which become the panels. As a custom designed product it can be manufactured in a multitude of sizes while maintaining a basic square or rectangular shape. Panels are formed allowing process piping, actuator stem pipes, hand wheel shafts etc. to protrude thru the panel(s) allowing the enclosure to be installed around existing field installed equipment. Materials of construction include fabricated 304 SS framing, refractory, SS bolts, galvanized steel channel bracket supports, malleable iron bracket or SS bracket, and SS Hinges and Latches.

Fireproof Enclosures™ have been fire tested by FM, TDI and many industrial petrochemical facilities throughout the world. Each Fireproof Enclosure™ is identified with an I.D. Tag containing a unique Identification Number. This number should be referenced in any maintenance, installation or repair communication with Thermal Designs, Inc.


The Fireproof Enclosure™ is constructed of panels to be installed around the device requiring protection. Prior to installation the enclosure may require disassembly. Disassembly is a simple process of removing the external bolts with a socket wrench or nut driver. During disassembly particular attention should be paid to the internal “Match Marks” which are used for alignment of the panels during assembly. Match Marks located on the inside face of panels may be alpha or numeric depending on the size of the enclosure. When more than one enclosure is supplied on a given order the match marks are color coded to allow the original manufactured assembly to be installed correctly. See Figure 1.

WARNING: Under no circumstances should two different color match marks be utilized in the assembly of a single enclosure.

Figure 1
Internal Match Marks
Figure 2
Captive Fasteners in Panel

Panels have an inside and an outside surface. The inside is coated with a white marine epoxy sealer. The outside maybe a SS sheath, gray urethane coating, Safety Purple Urethane coating or other customer required color coating. Panel attachment is by SS Captive fastener. One panel is attached to an adjoining panel with the captive fastener and a nut insert. See Figure 2. Beware of sharp edges and corners on SS enclosures.

WARNING: Captive fasteners should not be removed from their respective panel locations as missing fasteners create flame paths and passive fire protection failure.

Figure A

Figure B

Figure C

Panel fasteners should not be tightened beyond hand tight plus one quarter turn. Proper tightening seals the flame path, over tightening may bend the frame or strip the threads on the hardware.

The method of enclosure mounting varies with each custom manufactured enclosure. Generally one or more of three (3) methods are used in mounting enclosure on equipment.

    a. Adjustable Single or Split “U” Clamp (Attaches to embedded channel in the Supporting Panel to “hang” enclosure from equipment.) See Figure A.

    b. Adjustable Pipe style Split Clamp with angle iron. (Angle Iron is welded to pipe clamp which clamps around equipment. Angle Iron bolts to embedded channel in the Supporting Panel) See Figure B.

    c. Stainless Steel Band Strap (Attaches to embedded channel in the Supporting Panel to “hang” enclosure from equipment) See figure C.

Details specific to the model are included on the drawing supplied with each model Fireproof Enclosure™.

Hinged Access Doors are installed and aligned during the manufacturing process. Flame paths are sealed by double step joint design. Control connections electric or pneumatic are permanently affixed to the internal structural steel members. They are not adjustable or removable. If not needed, holes should be plugged with the appropriate size and type plug to avoid violating the fireproof integrity.

Figure D
Embedded Channel
Figure E
Mounting Assembly bolted to Supporting Panel
Figure F
Split Panel
Figure G
Connection / Coupling


Assembly details specific to the product are provided on the enclosure drawings. General instructions follow. After Stem Pipe, Hand wheel, Declutch lever or other immediate access fire sacrificial device has been removed, place enclosure on grade laid out such that the bottom and side(s) panels match marks align.

    A. Review drawing. Enclosures are typically drawn showing the inside surfaces of panels with “UP” arrows indicating required positioning of panels upon installation. Identify panels that contain embedded galvanized channel. The enclosure mounting hardware (i.e. clamp/angle iron) bolts to the embedded channel in the panel providing a Supporting Panel(s) for the rest of the enclosure. The same applies to “U” shaped brackets and SS bands. See Figure D & E.

    B. Loosely attach mounting bracket or mounting assembly around item to be protected. Refer to drawing for general location of mounting assembly attachment to equipment.

    C. Loosely bolt support bracket or clamps to embedded galvanized channel in Supporting Panel by means of captured bolts provided in channel. Supporting Panel may consist of more than one panel, which will assemble by means of captive fasteners and nut inserts to form one large panel. See Figure E & F.

    D. Verify enclosure positioning and clearance. Verify that Supporting Panels are level, and tighten mounting assembly and Supporting Panel fasteners.

    E. Loosely attach any side panels with penetrations (hand wheel extensions, electrical connections, pneumatic connection, etc.) to Supporting Panel.

    F. Connect any electrical or pneumatic connections to the inside of the assembled panels and to the protected device as required for operation. See Figure G.

    G. Install all hand wheel and declutch lever extensions.

    H. Place remaining panel(s) on partially assembled enclosure assuring proper match mark alignment.

    I. Tighten all captive fasteners on all panels.

    J. Install hand wheels and declutch levers.

    K. The enclosure includes an “Installation/Repair Pak” which includes silicon caulk, refractory caulk, captive fasteners, and wet refractory.

    L. Once assembled, flame paths should be minimized thru use of the Installation Repair Pak.

    M. Wet refractory is intended for use in closing any potential flame paths (gaps) between the enclosure and materials extending outside the enclosure.

      i. Wet refractory is sealed in a clear plastic bag and can be formed to seal the gaps around piping, stem pipes, thrust bases, and other points of enclosure penetrations. Not for use on rotating shafts penetrating through enclosure.

      ii. Rubber gloves should be used in handling the wet refractory

      iii. Rolling or packing can form the wet refractory. Once the material is formed or packed into the gap, it should be fixed in place and sealed externally with Refractory Caulk and overlaid with Silicone caulk.

IV. Maintenance of Protected Device or Equipment

Periodic maintenance of the protected equipment may require the removal of the enclosure in part or in its entirety. Special attention should be paid in the enclosure disassembly to avoid damage to the panels or the refractory.

WARNING: If panel removal is required, power should be disconnected, tagged & locked out. Pneumatic or hydraulic lines should be isolated and bled to avoid damage or personnel injury

In removal of panels, the panels containing connectors should be removed last allowing access for disconnecting signal & power lines. Generally the top panel is removed first and the split Supporting Panel remains in place during maintenance unless the equipment requires removal to shop for repair.

In panel removal, care should be taken when retracting the captive fasteners assuring that the fasteners remain with the panel for ease of reassembly.

V. Maintenance of Fire Proof Enclosure™

    a. Maintenance of the enclosure is limited to maintaining moisture, UV, and flame path integrity. This is accomplished through inspection of the enclosure during protected equipment maintenance. Proper assembly and use of original equipment manufacture replacement parts is essential to maintaining long-term fire protection capability.

    b. It is recommended that barring a requirement for semiannual maintenance of the protected equipment that the enclosures be visually inspected inside & out EVERY 6 MONTHS.

    c. The interior can be inspected without removal of panels, using a flashlight through the access doors. Inspection should be performed to assure refractory is in place, and flame paths have remained sealed. SEE INSTALLATION INSTRUCTIONS FOR RESEALING PIPE, SPOOL BRACKET, OR OTHER ENCLOSURE PANEL PENETRATIONS.

    d. The exterior should be inspected to assure that the equipment is protected from flame path penetration. Captive fasteners should be in place, Exterior coating inspected for cracks, flaking or chipping. Replace fasteners and recoat as required to maintain moisture proof and flame path integrity.

VI. Repair of Fire Proof™ Enclosures

    a. If doors or panels require repair it is best to contact the Thermal Designs, Inc. facility or representative nearest you to receive specific instructions relative to the type repair required. After contact you will probably be asked to supply a photograph and the serial number of the item-requiring repair. Frequently due to the nature and type of damage it is more cost effective to replace the door or the panel damaged than it is to attempt to field repair the damage.

    b. Thermal Designs, Inc. can be contacted by telephone, e-mail or facsimile in the United States or the United Kingdom as listed below.

United States – Thermal Designs, Houston, TX, Telephone 713-433-8110, Facsimile 713-433-5227, e-mail

United Kingdom – Thermal Designs UK Ltd. Bath, England Telephone 44-1225-811141, Facsimile 44-1225-811447 e-mail

This article comes from Thermal Designs, Inc.
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