Engineering Procedure
SAEP-357 20 March 2013
Fiber Reinforced Plastic Grating Installation Guide
Document Responsibility: Non-Metallic Standards Committee
Saudi Aramco DeskTop Standards
Table of Contents
1 Scope............................................................. 2
2 Conflicts and Deviations................................. 2
3 Applicable Document..................................... 2
4 General Requirement..................................... 2
5 Delivery Inspection......................................... 2
6 Handling and Storage.................................... 3
7 Grating Fabrication......................................... 3
8 Installation...................................................... 4
9 Health and Safety........................................... 6
Previous Issue: 12 July 2011 Next Planned Update: 12 July 2016
Revised paragraphs are indicated in the right margin Page 1 of 8
Primary contact: Mehdi, Mauyed Sahib on +966-3-8809547
Copyright©Saudi Aramco 2013. All rights reserved.
Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
1 Scope
This procedure provides recommendations for the fabrication and installation of fiber
reinforced plastic (FRP) grating systems on offshore platforms. The objective is to
provide guidelines for achieving durable, cost effective installations of FRP grating
systems that meet the specified performance requirements. This document is intended
for use by project engineers, maintenance, and the fabrication/installation contractors.
The recommendations apply to delivery inspection, handling, storage, fabrication,
installation, health and safety.
2 Conflicts and Deviations
Conflicts between this Engineering Procedure and any other Mandatory Saudi Aramco
Engineering Requirements (MSAERs) shall be resolved by the Consulting Services
Department in writing.
3 Applicable Document
Saudi Aramco Engineering Standard
SAES-M-005 Design and Construction of Fixed Offshore Platforms
4 General Requirement
The CONTRACTOR shall furnish, fabricate (where necessary), and install all fiberglass
reinforced plastic (FRP) grating, with all accessories and incidentals necessary to
produce a complete and serviceable installation as specified by the contract documents.
FRP grating installations should be engineered in advance as per SAES-M-005.
The scope of work documents for engineered systems may include drawings for each
grating panel that permit shop fabrication of grating sections before delivery.
However, FRP grating is readily cut and fit at the job site. This eliminates the cost of
engineering and allows the delivery of grating with standard panel dimensions.
5 Delivery Inspection
The quantity, dimensions and special requirements of all grating components shall be
verified for compliance with the purchase order and the shipping documents.
Shipments not complying with the purchase order or the shipping documents shall be
reported to vendor for corrective action.
All grating components should be visually inspected for damage that may have occurred
during shipment. Grating components or materials that are rejected should be reported
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Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
to vendor for corrective action.
Resin sealant kits shall be inspected to ensure that the kits have remaining shelf life,
contain all the necessary materials and that containers are not damaged or leaking.
6 Handling and Storage
All grating materials shall be handled with care to prevent cracking, chipping and any
other types of damage. Materials should be stored in an area free of construction debris.
Adhesives, resins, their catalysts and hardeners shall be stored in dry storage facilities.
The storage temperatures shall be between 50°F (10°C) and 85°F (30°C), until they are
needed for fabrication work.
7 Grating Fabrication
7.1 Layout
Pultruded grating shall always be installed with the bearing bars spanning the
supporting structure. Standard panel sizes include 3, 4 or 5 ft widths and 8, 10,
12 ft lengths, having a manufacturing tolerance of ±0.25 inch (6.4 mm), for both
width and length. Custom panels within the 5 x 20 ft envelope are available by
special order. The panels are marked to fit the supporting structure, including
cutouts to accommodate piping that runs vertically through the deck.
7.2 On Site Fabrication - Safety Precautions
Installation personnel should review all the Material Safety Data Sheets
provided by the manufacturer before starting the installation operations.
Adequate ventilation and all the necessary safety precaution, shall be followed
when cutting or drilling fiberglass products or when sealing or adhesive bonding
with resin products.
7.3 Cutting
FRP grating should be cut on the job site with ordinary carpenter's tools.
Cuts should be made with abrasive (preferably carbide or diamond) tipped tools
that leave machined surfaces free of delaminations, splinters, dry fiber and
crazes in the resin. Cross cuts and rip cuts should be made using a circular saw
with 30 to 40 grit cutting blades. Diamond grit blades are used for fast cuts and
long blade life.
Most reciprocating saws (e.g., Sawzall, jig saw, etc.) are suitable for cutting
holes and notches, however, cordless saws are preferred. Blades should be
abrasive tipped and tungsten carbide tipped blades are recommended.
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Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
Routers with tools and speeds suitable for fiberglass are also recommended for
cutting gratings where appropriate.
7.4 Sealing Cuts
All shop fabricated cuts should be coated with polyester, vinyl ester or epoxy
resin in accordance with manufacturer's specifications. All field fabricated cuts
should also be coated by the contractor in accordance with the manufacturer's
instructions. The usual coating requirement is a thermoset resin applied by paint
roller. Some manufacturers allow clear urethane or acrylic spray coatings as an
alternative to thermoset resin coatings.
7.5 Framing and Finishing of Cutouts
Where it is desired to close openings between the grating and penetrating objects
(e.g., pipes, tubes, ducts, etc.) to reduce the chance of small objects falling through
the opening, the cutouts can be framed with rings or collars using fiberglass plate
or “F” sections (a panel connector). Fiberglass plate and “F” section panels are
readily available in polyester resin from grating manufacturers.
7.6 Inspection of Fabricated Parts
Inspection of fabrication operations is permitted as requested by the owner,
Saudi Aramco. The fabricator shall give ample notice to contractor prior to the
beginning of any fabrication work so that inspection may be provided.
Fabricated gratings should be subjected to the visual defect requirements
described in Section 5.
8 Installation
The contractor shall prepare assembly drawings that shall be followed during grating
installation. Grating panels shall be secured with hold-down fasteners as specified herein.
Contractor to ensure that when installing FRP grating to offshore platform boat
landings, the panels are installed, running in a North to South direction to minimize
exposed cut panels to wave and swell loading.
8.1 Training of Installation Personnel
The manufacturer shall provide training of contractor's installation personnel as
requested on the purchase order as per international industrial standard.
8.2 Inspection of Installation
The manufacturer shall provide spot inspection of the installation as requested
on the purchase order.
Page 4 of 8
Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
8.3 Structural Support of Cutouts
FRP grating may lose stiffness and strength as a result of cutouts. The entire
cutout section should be reinforced if not fully supported by end support.
Special attention is required to ensure adequate support of FRP grating at cutout
locations. Generally, cutouts should be reinforced if deflections at the cutout
perimeter exceed 0.25 inch (6.4 mm) under a concentrated load of 250 lb
(113 kg). Sometimes, cutouts can be supported from the backside by adding
steel support angle to the penetrating structure, if permissible, or by adding
additional steel cross members to support the cut ends of the bearing bars.
Cutouts can also be reinforced by bonding 0.375 inch (9.5 mm) or 0.25 inch
(6.4 mm) fiberglass plate to the grating over the cutout. The plate can be fitted
to piping that protrudes through the cutout. This technique is recommended
when there are multiple penetrations in close proximity.
End support shall be provided where the grating is cut around objects and at the
edges as specified by SAES-M-005, Section 8.6.1b. Appropriate structural
supports should be designed and fabricated to provide a permanent support to
the cut panel. Supporting gratings by penetrating non-structural objects is
prohibited unless detailed analysis shows that induced stresses and deflection on
the supporting object are within allowable limits.
Fiberglass F section kick plate provides good reinforcement for square or
rectangular cutouts. The “F” profile is forced into position over the edge of the
cut grating with a rubber mallet. “F” section kick plate can be bonded in place
when required.
8.4 Fastening Hardware
All fastening hardware shall be made of stainless steel type 316 and be provided
by the contractor. These clips shall be used at a minimum, one at each panel
corner and two on each crossing over support beams. This configuration should
result in one hold-down clip per 4 square feet of grating surface. Appropriate
clips, such as F clips, shall be provided to tie adjacent grating panels at the
splice whenever the net span exceeds 36 inches (914 mm).
Additional fasteners, Type GC, made of 316 stainless steel, should be installed
at boat landing locations and cellar decks, resulting in two (2) hold-down clips
per four (4) square feet of grating.
Grating fasteners may be attached to the supporting structure by one of the
following methods:
8.4.1 Grating should be attached to the supporting steel with G clips or Hilti
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Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
clips. G clips should be used with top mounted clamps over the grating
connected to friction clips (G clips) placed under the supporting steel.
The clamp is connected to the clip by a 0.25 inch (6.4 mm) - 20 bolts.
The studs for G clips shall be the type that is not separable from the clips
to ensure that the clips cannot be dropped through the grating during
maintenance work. G clips should not be used to attach stair treads.
Gratings at offshore platform cellar-decks and boat landing areas should
be fastened using Type GC fasteners with a 2 diameter hold down top
plate.
Hilti clips are connected by threaded bolts that screw into threaded
anchor studs that are shot into the supporting steel. The primary
advantage is rapid installation and lower installation labor costs.
8.4.2 The fasteners for wave zone gratings should be heavy duty saddle clips
attached with heavy duty bolts, nuts and lock washers. Saddle clips may
be attached by bolt and nut through drilled holes, by self-tapping screws
through drilled holes or by shot studs in the supporting steel. Wave zone
gratings shall be attached to brackets that are designed for the specified
wave loads.
All grating fasteners shall be equipped with lock washers or nuts with
nylon inserts or an equivalent locking design approved by the Owner to
ensure that fasteners remain tight during the service life of the platform.
9 Health and Safety
In general, all safety precautions set forth by the grating manufacturer shall be adopted.
Materials Safety Data Sheets (MSDS) should always be read by the contractor
personnel before commencing work and should be implemented as per given checklist
by manufacturer.
9.1 Work Site Safety Measures
Fiberglass grating may slide underfoot when positioned on the supporting
structure before it is secured by fasteners. Grating installation work sites should
be barricaded and clearly designated at all times to prevent general construction
personnel and pedestrians from stepping on grating panels before all fasteners
have been installed and inspected. The same precaution should be exercised
when grating panels are removed for construction or maintenance operations.
Precaution should be exercised to prevent the potential of falls through the deck
because of non-secured grating panels.
Page 6 of 8
Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
9.2 Installer Safety Training
Grating installation personnel shall take all “health and safety” training before
installation work is started on each offshore facilities project.
9.3 Safety Equipment for Installers
The contractor installation personnel shall acquire all the necessary health
and safety accessories including safety glasses, ear protection, hard hats,
steel toe shoes and a fall protection safety harness. Installation personnel
shall also use face shields and dust masks during cutting and sanding operations.
Leather gloves are recommended to prevent fiber splinters and pinch injuries to
the hands of installers. Latex gloves are recommended when handling wet
chemicals and uncured resins.
9.4 Chemical Hazards
Special precautions should be taken when working in contact with resins, curing
agents, catalysts, etc. Extreme irritation may result from direct contact with skin
and also from inhalation. Installers should observe strict personal hygiene at all
times with respect to the handling of these products when in the uncured liquid
state. Smoking, eating and drinking are prohibited during handling and storage
of resin, paste, adhesives or other chemicals.
Peroxide curing agents used with vinyl ester and polyester resins are especially
harmful to eyes. Even small quantities can cause permanent damage.
Eye protection must be worn when handling peroxides. Eye protection is
recommended when handling all curing agents. Contact with the skin can be
prevented by the use of latex gloves and barrier creams. Skin areas that are
contaminated should be immediately and thoroughly washed with soap and water.
The use of oxygen or fresh-air masks is recommended when installers are
exposed to extreme dust or noxious gases for prolonged periods in confined
spaces or any space where ventilation is poor.
9.5 Dust Hazards
The use of a dust mask and protective clothing is recommended during cutting
and sanding of fiberglass grating to prevent inhalation of the glass-fiber dust and
to prevent skin irritation. Well ventilated rooms or open air spaces are advised
to minimize contact with dust. Ventilation systems for fabrication areas should
include a portable dust extraction unit that can be used as close as possible to the
work.
Page 7 of 8
Document Responsibility: Non-Metallic Standards Committee SAEP-357
Issue Date: 12 July 2011
Next Planned Update: 12 July 2016 Fiber Reinforced Plastic Grating Installation Guide
Revision Summary
12 July 2011 Revised the “Next Planned Update.” Reaffirmed the contents of the document, and reissued
with editorial changes.
20 March 2013 Editorial revision to change the document responsibility from Materials and Corrosion Control to
Non-Metallic Standards Committee.
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