RFQ Today
Certifications available: EN 10204 3.1 / 3.2 MTRs, ETA (European Technical Assessment) documentation, ICC-ES ESR approvals, Third-Party Inspection, ASTM / DIN / ISO / BS standards, and complete EPC export documentation packages.
Chemical Anchors
A world-class technical reference for EPC contractors, structural and civil engineers, procurement heads, TPI inspection agencies, and global project buyers specifying chemical anchor systems in concrete, masonry, and stone substrates across Oil & Gas, Power Generation, Petrochemical, Infrastructure, Offshore, and Industrial Construction.
Resin Chemistry
& Bond Mechanics
Chemical anchors (also termed adhesive anchors or bonded anchors) are two-component fastening systems comprising a reactive resin adhesive and a steel element — threaded rod, rebar, or stud — installed into a pre-drilled hole in concrete, masonry, or natural stone. The cured resin creates a continuous bond between the steel element and the substrate, distributing load over the full bonded length rather than concentrating it at a point as in mechanical expansion anchors.
1.1 — Technical Definition and Functional Role
A chemical anchor system consists of: (1) a reactive two-component resin adhesive — delivered via a cartridge with a static mixing nozzle — injected into a pre-drilled, cleaned hole in the base material; (2) a steel element (threaded rod, rebar, or headed stud) inserted into the resin-filled hole while the resin is fluid; and (3) a gel time and cure time period during which the resin polymerises around the steel element, bonding both to the hole walls and to the steel surface, developing full design load capacity upon complete cure.
In EPC and structural engineering, chemical anchors are the preferred anchoring solution for: equipment base plate attachment to concrete foundations (pumps, compressors, turbines, motors), pipe support and cable tray structural attachments, structural steelwork connections to existing concrete, rebar continuity in concrete repairs and extensions, seismic retrofitting, curtain wall and facade support connections, pipe rack column base plates, and access platform stanchion anchorage. Their principal advantage over mechanical expansion anchors is applicability in cracked concrete, proximity to slab edges, and in closely spaced anchor groups where expansion forces would compromise concrete integrity.
RR Hydraulic supplies chemical anchor systems and associated threaded rods, studs, and rebar under all applicable standards with full EN 10204 3.1 / 3.2 material traceability and ETA documentation capability.
1.2 — Resin Chemistry Classification
Epoxy Resin (EP)
Two-component system: epoxy base resin + amine hardener. Highest mechanical strength of all chemical anchor resin types — characteristic bond strength (τ_Rk) up to 35 MPa in C20/25 concrete. Excellent chemical resistance to oils, fuels, solvents, and dilute acids. Temperature performance: −40°C to +80°C sustained; short-term to +120°C. Long gel time allows repositioning. Standard for structural and heavy industrial EPC anchoring.
Vinylester Resin (VE)
Two-component: vinylester base + peroxide initiator. Superior chemical resistance vs epoxy — resists strong acids, alkalis, and chlorinated solvents. Used for anchoring in chemically aggressive environments: chemical plant, water treatment, offshore splash zones, and sour service areas. Faster cure than epoxy. ETA approval available for cracked and uncracked concrete per Option 1.
Polyester / Unsaturated Polyester (UP)
Two-component: polyester resin + peroxide initiator. Lowest cost; adequate for dry, non-critical anchoring in uncracked concrete and masonry. Limited chemical resistance; inferior to epoxy and vinylester in aggressive environments. Not recommended for seismic applications or cracked concrete without ETA Option 7 approval. Temperature limit: sustained +60°C. Used for secondary structural attachments and non-process utility connections.
Hybrid Resin (Epoxy-Acrylate)
Combines epoxy-like strength with faster cure times — gels and cures significantly faster than pure epoxy while approaching epoxy-level bond strength. Two-component system with faster gel time enables quicker re-drilling after installation in emergency repair scenarios. ETA approved for cracked and uncracked concrete. Widely used in construction where project schedule requires fast return-to-load.
Pure Epoxy (High-Temperature Grade)
Specially formulated two-component epoxy for elevated temperature applications: sustained service up to +150°C; short-term to +200°C. Required for anchoring in machinery rooms, boiler rooms, turbine plinths, and heat exchanger support structures where ambient temperatures or radiated heat from process equipment exceed standard resin limits. ETA approval document specifies reduced characteristic bond strength at elevated temperature.
Capsule / Glass-Capsule Resin
Pre-measured resin and hardener contained in a sealed glass or plastic capsule inserted into the pre-drilled hole before the threaded rod or rebar. The rod hammers through the capsule, shattering it and mixing the resin components simultaneously — no cartridge gun required. Used in overhead and confined-space anchoring where cartridge injection is impractical. Capsule systems require a rotary hammer or high-torque drill for rod installation to ensure adequate mixing.
1.3 — Bond Mechanics: Chemical Anchor vs Mechanical Expansion Anchor
| Parameter | Chemical (Bonded) Anchor | Torque-Controlled Expansion | Undercut Anchor | Engineering Implication |
|---|---|---|---|---|
| Load transfer mechanism | Bond / adhesion along full embedment length | Expansion friction + bearing (cone) | Mechanical interlock (undercut) | Chemical: distributed load; lower local stress |
| Cracked concrete suitability | Yes — ETA Option 7 | Limited (specific products only) | Yes (undercut) | Chemical preferred in cracked concrete |
| Edge distance | Lower minimum — no expansion force | Higher minimum — expansion stress | Moderate | Chemical: preferred near edges and joints |
| Anchor spacing | Closer spacing possible | Wider minimum spacing required | Moderate | Chemical: preferred for grouped anchors |
| Seismic performance | Good — ETA Option 7 seismic | Variable per product | Excellent | Verify ETA seismic category for project zone |
| Hole preparation sensitivity | High — clean, dry hole critical | Low — cleaned hole standard | Moderate | Chemical: hole cleaning is safety-critical |
| Cure time dependency | Yes — waiting period before loading | No — load immediately after torquing | No | Chemical: project schedule impact for cure |
| Temperature sensitivity | Yes — reduced bond at high temp | Moderate | Low | Chemical: verify ETA bond strength at design temp |
| Sustained load (creep) | Resin creep possible — long-term reduction | None — mechanical interlock | None | Chemical: long-term load reduction factor applied |
| Overhead / inverted | Yes — with gel-time controlled resin | Yes | Yes | Chemical: specify ETA overhead approval |
1.4 — Critical Installation Parameters
Hole Cleaning — Safety-Critical Step
The concrete hole must be cleaned of all drilling dust, loose particles, and moisture before resin injection. Required sequence: air blow minimum 3 passes (from bottom to top), wire brush minimum 2 passes, air blow minimum 2 final passes. Dirty holes reduce bond strength by 30–70%. For diamond-cored holes (smoother walls): additional brushing cycles are mandatory. This is the single most critical installation step — hole cleaning failure is the primary cause of chemical anchor system failure in EPC projects.
Gel Time and Cure Time
Gel time: the working window after mixing during which the resin can be injected and the rod positioned. After gel time, the rod must not be moved or loaded. Cure time: the period from installation to full load capacity — varies from 20 minutes (fast-cure at 20°C) to 24+ hours (epoxy at 5°C). Temperature is the primary variable: cure time doubles approximately every 10°C decrease below 20°C. Always verify cure time for the actual installation temperature before loading.
Embedment Depth (h_ef)
The effective embedment depth is the primary design variable governing anchor pull-out and concrete cone failure capacity. Minimum embedment per ETA product specification: typically 8×d to 12×d for standard applications; 12×d to 20×d for seismic and heavy-load conditions. Greater embedment depth increases both bond failure load (proportional to h_ef) and concrete cone capacity (proportional to h_ef^1.5). Verify minimum and maximum h_ef per ETA product annex.
Substrate Moisture Condition
Dry concrete: maximum bond strength per ETA characteristic value. Saturated concrete (surface dry): reduced bond — typically 0.7–0.85 reduction factor applied per ETA wet condition data. Underwater / fully submerged: only vinylester or specially formulated underwater epoxy systems are applicable. Normal concrete moisture variation on an EPC construction site requires the resin system to be specified for wet installation if water ingress through the slab is possible.
Temperature at Installation
Minimum installation temperature: −5°C to +5°C depending on resin system (per ETA product data sheet). Maximum installation temperature: typically +40°C for standard resins; +35°C for epoxy in direct sunlight. At temperatures above maximum, premature gelling occurs before the rod can be positioned. In EPC tropical construction, early morning installation is often specified to avoid peak temperature gel-time failure.
Rod Insertion Technique
The threaded rod must be inserted with a slow, rotating motion to ensure the resin wraps completely around the rod thread. Hammering a smooth rod into resin without rotation leaves air pockets that reduce bonded area. For rebar, the rod should be pushed in while slowly rotating. The resin must appear at the hole mouth as the rod reaches full embedment depth — confirmation that the hole was correctly filled. If resin does not appear at the hole mouth, the hole was underfilled.
1.5 — Design Load Capacity: Key Formula Reference
τ_Rk = Characteristic bond strength per ETA product approval (MPa) — varies by resin and concrete class
d = Threaded rod / rebar nominal diameter (mm)
h_ef = Effective embedment depth (mm)
Concrete cone capacity (EN 1992-4):
N_Rk,c = k₁ × √f_ck × h_ef^1.5
k₁ = 8.9 (cracked concrete); 12.7 (uncracked concrete)
f_ck = Characteristic compressive strength of concrete (MPa)
Design resistance: N_Rd = N_Rk / γ_M2; γ_M2 = 1.8–2.5 per EN 1992-4 / ETA
τ_Rk (epoxy, C25/30, dry) = 14.0 MPa (product-specific; verify from ETA annex)
N_Rk,p = 14.0 × π × 16 × 160 = 112,717 N = 112.7 kN
N_Rk,c = 8.9 × √25 × 160^1.5 = 8.9 × 5 × 2023 = 90,024 N = 90.0 kN (governs, cracked)
N_Rd = 90,024 / 2.0 = 45.0 kN design capacity (concrete cone governs; increase h_ef to raise capacity)
Submit your anchor schedule, substrate class, rod grade, resin type, and quantity for a fully documented RFQ within 24 hours.
Embedment Design
& Standards Compliance
The steel element in a chemical anchor system — threaded rod, rebar, or headed stud — must be specified to the correct material grade, diameter, and length to develop the full design capacity of the resin-concrete bond. Material grades are governed by ASTM A193, A307, F593, ISO 898, and DIN standards. All applicable standards are supported at RR Hydraulic with full certification.
Submit rod grade, diameter, embedment length, resin type, and quantity to sales@rrhydraulics.com for a fully certified offer.
2.1 — Threaded Rod Dimensional and Strength Reference Table
Chemical anchor systems use fully threaded rod (DIN 975 / DIN 976) cut to the required length or supplied in standard lengths. The following table provides dimensional and mechanical data for the most commonly specified metric threaded rod grades in chemical anchor applications.
| Dia. × Pitch | Stress Area (mm²) | Grade 4.8 UTS (kN) | Grade 8.8 UTS (kN) | Grade 10.9 UTS (kN) | A4-70 SS UTS (kN) | Min Embedment (mm) — Std | Min Embedment (mm) — Seismic | Typical Drill Bit Dia (mm) |
|---|---|---|---|---|---|---|---|---|
| M8 × 1.25 | 36.6 | 15.4 | 29.3 | 38.1 | 25.6 | 64–80 | 80–96 | 10 |
| M10 × 1.5 | 58.0 | 24.4 | 46.4 | 60.3 | 40.6 | 80–100 | 100–120 | 12 |
| M12 × 1.75 | 84.3 | 35.4 | 67.4 | 87.7 | 59.0 | 96–120 | 120–144 | 14 |
| M16 × 2.0 | 157.0 | 66.0 | 125.6 | 163.3 | 109.9 | 128–160 | 160–192 | 18 |
| M20 × 2.5 | 245.0 | 102.9 | 196.0 | 254.8 | 171.5 | 160–200 | 200–240 | 22 |
| M24 × 3.0 | 353.0 | 148.3 | 282.4 | 367.1 | 247.1 | 192–240 | 240–288 | 28 |
| M27 × 3.0 | 459.0 | 192.8 | 367.2 | 477.4 | 321.3 | 216–270 | 270–324 | 32 |
| M30 × 3.5 | 561.0 | 235.6 | 448.8 | 583.4 | 392.7 | 240–300 | 300–360 | 35 |
| M36 × 4.0 | 817.0 | 343.1 | 653.6 | 849.7 | 571.9 | 288–360 | 360–432 | 40 |
| M42 × 4.5 | 1121.0 | 470.8 | 896.8 | 1165.8 | 784.7 | 336–420 | 420–504 | 48 |
| M48 × 5.0 | 1473.0 | 618.7 | 1178.4 | 1531.9 | 1031.1 | 384–480 | 480–576 | 55 |
2.2 — Design Reference: Minimum Edge Distance and Anchor Spacing
| Rod Dia (mm) | h_ef Typical (mm) | Min Edge Dist c_min (mm) | Min Spacing s_min (mm) | Crit. Edge Dist c_cr (mm) | Crit. Spacing s_cr (mm) | Min Concrete Thickness (mm) |
|---|---|---|---|---|---|---|
| M8 | 80 | 40 | 40 | 120 | 160 | 120 |
| M10 | 100 | 50 | 50 | 150 | 200 | 150 |
| M12 | 110 | 55 | 55 | 165 | 220 | 165 |
| M16 | 160 | 80 | 80 | 240 | 320 | 240 |
| M20 | 200 | 100 | 100 | 300 | 400 | 300 |
| M24 | 240 | 120 | 120 | 360 | 480 | 360 |
| M30 | 300 | 150 | 150 | 450 | 600 | 450 |
| M36 | 360 | 180 | 180 | 540 | 720 | 540 |
2.3 — Applicable Standards and Compliance Framework
ETAG 001 / ETA
European Technical Approval Guideline for Metal Anchors — the primary European qualification framework for chemical anchor systems. Options 1 (non-cracked), 5 (seismic), and 7 (cracked + seismic) define the test programme required for ETA approval. The ETA document for each specific product contains: characteristic bond strengths by concrete class, installation conditions, temperature ranges, and reduction factors. Mandatory for CE-marked products used on European EPC projects.
EN 1992-4 (Eurocode 2 Part 4)
Design of fastenings for use in concrete — the structural design standard for chemical and mechanical anchor systems in European EPC projects. Covers: tension (pull-out, concrete cone, splitting), shear (steel, concrete edge, pryout), and combined loading. Defines safety factors γ_M2 = 1.5–2.5 depending on failure mode, anchor type, and installation category. Mandatory for all structural chemical anchor design in European and international EPC projects.
ACI 318 Appendix D / ACI 318-19 Ch.17
Anchorage to concrete — the North American structural design standard for chemical and cast-in anchors. Defines nominal tensile and shear capacity for concrete breakout, pullout, side-face blowout, and steel failure modes. Strength reduction factors ϕ = 0.65–0.75 depending on ductility and supplemental reinforcement. Used on US-coded EPC projects and ASME-related civil structural work.
ICC-ES AC308
Acceptance criteria for post-installed adhesive anchors in concrete elements — US evaluation standard used by ICC-ES (International Code Council Evaluation Service) for issuing ESR (Evaluation Service Reports) for chemical anchor products. ESR reports provide design data equivalent to ETA for ACI 318 / IBC (International Building Code) compliance on North American EPC projects. Reference the specific ESR report number when specifying chemical anchor products for ASME or IBC-governed projects.
ASTM A193 / A307 / F593
Material standards for chemical anchor rods: ASTM A193 B7 (alloy steel, high-temperature, NACE with B7M); ASTM A307 (low-carbon steel, Grade A/B for general anchoring); ASTM F593 (stainless steel threaded rod, grades 304/316). Rod material must develop tensile capacity exceeding the anchor design load — rod steel failure is an undesirable but predictable failure mode that must be verified in the anchor design check sequence.
DIN 975 / DIN 976
Metric threaded rod standards used with chemical anchor systems in European EPC: DIN 975 (full-length continuous thread rod); DIN 976 (precision-machined stud rod). Dimensional and mechanical requirements: thread tolerance 6g (external); available in property classes 4.8, 5.6, 8.8 per ISO 898-1. HD-galvanised per ISO 1461 / DIN 267-10 for corrosion resistance in outdoor and industrial foundations.
ISO 898 / ISO 3506
Mechanical properties for carbon/alloy steel (ISO 898-1) and stainless steel (ISO 3506) threaded rods used as chemical anchor elements. ISO 898-1 property classes 4.8, 8.8, and 10.9 govern standard chemical anchor rods. ISO 3506 A4-70 and A4-80 (SS 316) for marine, offshore, chemical, and sour service anchor applications requiring corrosion-resistant rod material.
NACE MR0175 / ISO 15156
For chemical anchors in sour service environments (H₂S-bearing atmospheres in O&G facilities): carbon steel threaded rod must comply with NACE MR0175 hardness limits (max 22 HRC). ASTM A193 B7M rod (controlled hardness) or SS A4-70 (ISO 3506) are the standard NACE-compliant chemical anchor rod specifications. Hardness verification on 100% of rod lots mandatory for sour service supply.
2.4 — Cure Time Reference Table by Resin Type and Temperature
| Resin Type | Gel Time @ 5°C | Cure Time @ 5°C | Gel Time @ 20°C | Cure Time @ 20°C | Gel Time @ 35°C | Cure Time @ 35°C | Min Install Temp |
|---|---|---|---|---|---|---|---|
| Epoxy (standard) | 90 min | 24 h | 25 min | 6 h | 8 min | 2 h | +5°C |
| Epoxy (fast-cure) | 45 min | 12 h | 12 min | 2 h | 4 min | 45 min | +5°C |
| Vinylester | 60 min | 16 h | 15 min | 3 h | 5 min | 1 h | −5°C |
| Hybrid Epoxy-Acrylate | 30 min | 8 h | 8 min | 1.5 h | 3 min | 30 min | −10°C |
| Polyester | 45 min | 12 h | 10 min | 2 h | 3 min | 45 min | 0°C |
| HT Epoxy (>80°C service) | 120 min | 48 h | 45 min | 12 h | 15 min | 3 h | +10°C |
Coatings &
Installation Protocol
The threaded rod or rebar element in a chemical anchor system is specified for both structural strength (to develop the design load) and corrosion resistance (to achieve the design service life). RR Hydraulic supplies chemical anchor rods in all standard and high-performance grades — carbon steel, hot-dip galvanised, stainless, duplex, and NACE B7M — with full EN 10204 3.1 / 3.2 traceability.
3.1 — Threaded Rod Material Grade Overview
| Material / Grade | Spec | UTS (MPa) | Yield (MPa) | Temp Range (°C) | Corrosion Resistance | NACE MR0175 | Primary EPC Application |
|---|---|---|---|---|---|---|---|
| Grade 4.8 CS | ISO 898 / DIN 975 | 420 | 340 | −20 to +300 | Low — must be coated | Yes | Light structural, indoor foundations |
| Grade 8.8 CS | ISO 898 / DIN 975 | 800 | 640 | −20 to +300 | Low — must be coated | Yes (verify HRC) | Standard structural anchoring, machinery bases |
| Grade 10.9 CS | ISO 898 | 1040 | 940 | −20 to +300 | Low | No | High-load anchors; heavy machinery bases |
| A193 B7 Alloy | ASTM A193 | 860–1000 | 723 | −45 to +454 | Low — must be coated | No (B7M for NACE) | High-temp process equipment anchoring |
| A193 B7M (NACE) | ASTM A193 | 690–862 | 552 | −45 to +454 | Low — must be coated | Yes | Sour service, H₂S zones, process vessels |
| HDG Grade 8.8 | ISO 898 + ASTM A153 | 800 | 640 | −20 to +200 | Good (45–85 µm Zn) | Yes | Outdoor, coastal, standard EPC anchoring |
| A2-70 (SS 304) | ISO 3506 | 700 | 450 | −196 to +300 | Good | Yes | Indoor / mild chemical process areas |
| A4-70 (SS 316) | ISO 3506 | 700 | 450 | −196 to +300 | Very Good | Yes | Marine, offshore, chemical, NACE service |
| A4-80 (SS 316 SH) | ISO 3506 | 800 | 640 | −196 to +300 | Very Good | Yes | High-load marine / offshore anchoring |
| Duplex 2205 | UNS S31803 | 620 | 450 | −50 to +315 | Excellent | Yes (28 HRC max) | Offshore splash zone, subsea, sour + Cl⁻ |
3.2 — Corrosion Resistance and Exposure Category
| Exposure Category | Environment Description | Carbon Steel (Plain) | HDG (45 µm+) | SS A4-70 (316) | Duplex 2205 | EPC Application |
|---|---|---|---|---|---|---|
| C1 / C2 | Interior dry / Low humidity | Acceptable | Good | Excellent | Excellent | Indoor equipment bases, dry areas |
| C3 | Urban / moderate industrial | Poor | Good | Excellent | Excellent | Outdoor inland plant, substations |
| C4 | Industrial, chemical, coastal | Not acceptable | Fair | Very Good | Excellent | Process plant, coastal facilities |
| C5-I / C5-M | High humidity / marine | Not acceptable | Limited life | Good | Very Good | Offshore topsides, marine structures |
| Im2 (Seawater) | Immersed — seawater / tidal | Not acceptable | Not acceptable | Fair | Very Good | Subsea, tidal zone anchors |
| Chemical / Sour | H₂S, acids, chlorides | Not acceptable | Not acceptable | Good (316) | Excellent | Sour service, chemical plant, offshore |
3.3 — Installation Protocol: Step-by-Step
3.3.1 — Mandatory Pre-Installation Steps
- Step 1 — Substrate assessment: Confirm concrete compressive strength class (f_ck), cracked / uncracked condition, moisture, and temperature. Cracked concrete requires ETA Option 7 resin approval; wet concrete requires wet-rated resin. Verify no post-tensioning tendons or rebar within the drill zone using electromagnetic rebar scanning (cover meter).
- Step 2 — Drill hole: Rotary hammer drill (for normal concrete) or diamond core drill (for reinforced concrete, high-strength concrete). Drill diameter per Table 2.A for the rod size. Drill depth = h_ef + 10 mm minimum (allows resin overflow to surface as confirmation of adequate fill). Drill straight — angular deviation > 3° reduces bond strength.
- Step 3 — Hole cleaning (CRITICAL — see Section 1.4): Compressed air blow (min 3 passes from bottom to top), nylon wire brush (min 2 passes), compressed air blow (min 2 final passes). For diamond-cored holes: additional 2 brush + 2 air cycles required. Confirm with torch inspection — hole walls must be free of dust films.
- Step 4 — Verify temperature and humidity: Concrete substrate temperature must be within resin installation temperature range. Do not install if frost is present in hole or if surface moisture exceeds resin wet-rated limit without using wet-condition rated resin.
3.3.2 — Resin Injection and Rod Installation
- Step 5 — Purge cartridge: Dispense minimum 3–5 cm of mixed resin from nozzle into waste container before injecting into hole — ensures proper A:B mixing ratio has been achieved; discard purged material.
- Step 6 — Fill hole: Insert nozzle to bottom of hole; inject resin while slowly withdrawing nozzle to prevent air entrapment. Fill to approximately 2/3 of hole depth for vertical-up (overhead) — fill to hole mouth for vertical-down and horizontal installations.
- Step 7 — Insert rod: Slowly push rod into resin while rotating to distribute resin around thread. Rod insertion must be completed before gel time elapses. Resin must appear at hole mouth as rod reaches target embedment depth — confirms full hole filling. Mark rod at target embedment depth before insertion.
- Step 8 — Hold and cure: Rod must not be disturbed, loaded, or torqued until full cure time has elapsed at site temperature. Tag each installed anchor with installation date, time, site temperature, and “NOT TO BE LOADED UNTIL [date/time]” label per project QA requirements.
- Step 9 — Post-cure inspection: Visual inspection for resin overflow at hole mouth (confirms fill). Tap test (rod tap should produce solid sound, not hollow). Torque test (if specified by engineer) at proof torque level per installation report. Record all anchor locations with installation and cure data on anchor log sheet.
3.4 — Surface Finish Options for Threaded Rods
| Finish | Specification | Coating Thickness (µm) | Salt Spray (h) | Resin Bond Impact? | Typical Exposure Category | Application |
|---|---|---|---|---|---|---|
| Plain / Black | ISO 898 standard | — | <24 | None — best bond | C1–C2 indoor | Indoor structural foundations; dry areas |
| Phosphate + Oil | DIN 50942 | 5–15 | 48–96 | Minimal | C1–C3 | Short-term storage; general EPC anchoring |
| Zinc Electroplate | ASTM B633 / ISO 4042 | 5–25 | 96–300 | Slight — clean thread before install | C2–C3 | Outdoor inland; general construction |
| Hot Dip Galvanise (HDG) | ASTM A153 / ISO 1461 | 45–85 | 2000+ | Minimal on thread form — resin bonds well to Zn | C3–C4 outdoor | Standard EPC outdoor; coastal (not marine) |
| Geomet / Dacromet | ISO 10683 | 8–12 | 1000–1500 | None | C3–C4 | Chemical plant; treated concrete zones |
| Passivation (SS A4) | ASTM A967 | Passive layer | 2000+ | None — excellent resin bond | C4–C5, Im2 | Marine, offshore, chemical, NACE service |
Industry Applications
& Documentation
RR Hydraulic maintains full traceability from raw material to final packed shipment on all chemical anchor rod and stud orders. Dimensional inspection, EN 10204 3.1 / 3.2 MTRs, NACE hardness compliance, ETA documentation support, and complete EPC export documentation packages are standard on all project-grade supply.
4.1 — Inspection & QC Protocol
4.2 — EN 10204 and Installation Documentation Requirements
| Document | Content | Standard / Source | Mandatory for EPC | Notes |
|---|---|---|---|---|
| Rod Material MTC | EN 10204 3.1 / 3.2 | Rod manufacturer | Yes | Heat-traceable; one MTC per rod lot |
| Chemical Composition | Rod lot lab analysis | Rod manufacturer | Yes (3.1 orders) | Per ISO 898-1 / ASTM A193 chemistry |
| Mechanical Properties | UTS, yield, elongation, hardness | Rod manufacturer | Yes | Proof load test confirmation |
| Hardness Report | HRC / HB per lot | Rod manufacturer | Mandatory — NACE service | A193 B7M ≤22 HRC; individual lot results |
| ETA Document | Resin product approval data | Resin manufacturer + approval body | Yes — design basis | Bond strength tables; installation conditions |
| Resin Batch Certificate | Batch no., manufacture/expiry, ETA ref. | Resin manufacturer | Yes | Traceability for each cartridge batch |
| Anchor Installation Log | Location, rod ID, resin batch, temps, cure time | Project QA form | Yes | Individual anchor traceability; held for design life |
| Site Pull-Out Test Report | Anchor ID, load, displacement, pass/fail | EN 1992-4 / ETAG 001 Annex C | Mandatory — structural anchors | Min 5% of each anchor type; witnessed by TPI |
| Hole Cleaning Inspection Record | Hole ID, cleaning steps, inspector sign-off | Project QA / installer procedure | Yes | Hold point before resin injection |
| Coating Certificate | Coating type, thickness, salt spray | ISO 4042 / ASTM A153 | Mandatory — coated supply | Per rod lot; thickness measurements recorded |
| NACE Compliance Statement | Hardness + grade confirmation | Per NACE MR0175 | Mandatory — sour service | References rod heat number and hardness test |
| ISO 9001:2015 Certificate | QMS certification | Third-party certifier | Mandatory — EPC | Covers rod manufacture and system supply |
| Country of Origin | Chamber of Commerce certificate | Chamber of Commerce | Mandatory — export | HS tariff code for customs |
| Packing List | Item-level per shipment | Per shipment | Mandatory | Cross-references lot numbers and MTC |
4.3 — Applications by Industry
Equipment Base Plates — Pumps, Compressors, Turbines
Chemical anchor systems are the primary method for anchoring rotating equipment base plates in EPC facilities. M20–M36 threaded rod in Grade 8.8 HDG (standard) or A4-70 SS (marine/offshore) set in epoxy resin. Embedment depth 200–360 mm for standard process equipment. Full EN 1992-4 design calculation required. Site proof load testing at 1.5 × design anchor load mandatory before grouting and equipment installation.
Pipe Support and Pipe Rack Structures
Epoxy or vinylester chemical anchors for column base plates, trunnion supports, spring hangers, and guide supports on EPC pipe rack structures. M16–M30 rods in Grade 8.8 HDG. Chemical anchors preferred in existing concrete pipe rack structures where expansion anchor edge distance cannot be achieved. Seismic-rated anchors (ETA Option 7) specified for pipe rack in seismic zones. Anchor group design including eccentricity and shear transfer per EN 1992-4.
Offshore Topsides Concrete Deck Anchoring
All chemical anchors on offshore concrete decks: A4-70 or A4-80 SS threaded rod minimum; duplex 2205 in splash zone and chemical atmosphere areas. Vinylester or epoxy-vinylester resin with proven wet concrete performance. ETA Option 7 (seismic + cracked concrete) approval mandatory. Post-installation pull-out testing by DNV or Lloyds TPI on 10% of structural anchors. EN 10204 3.2 on all rod material.
Seismic Retrofitting — Process Plant
Seismic retrofit of existing process plant structural connections using ETA Option 5 or Option 7 chemical anchor systems. Design per EN 1992-4 with seismic action combinations; anchor ductility category requirements per EN 1992-4 Annex E. High-strength vinylester or epoxy resin with ETA seismic performance data. Existing concrete quality (f_ck, crack state) must be verified by structural engineer before anchor design — do not assume design concrete class matches the original specification.
LNG Terminal Foundations
Cryogenic-exposed chemical anchors in LNG terminal concrete foundations: SS A4-70 threaded rod (cryogenic rated to −196°C). High-temperature epoxy resin for anchors near warm process piping foundations. Cold anchors (−165°C service): resin selection must be verified for sustained cryogenic temperature — standard epoxy resins become brittle below −50°C; specialised low-temperature resin systems required. All LNG anchor work with EN 10204 3.1 and TPI witness.
Power Station Civil Works
Turbine plinth anchoring, generator base anchorage, and boiler support structural connections using M30–M48 Grade 8.8 or B7 alloy rod in high-strength epoxy resin (HT grade for elevated ambient temperature zones). High embedment depths (300–480 mm) for heavy rotating machinery seismic load resistance. ASME B31.1 and IBC structural requirements for power station civil civil-structural interfaces. Full site acceptance testing protocol per project inspection test plan (ITP).
4.4 — Export Packaging Specification
- Threaded rods packed in bundles per diameter, grade, length, and coating — each bundle tagged with heat number, material grade, ISO 898 class, diameter, length, coating, and PO item reference
- VCI poly bag or VCI paper wrap on all carbon steel rods — prevents atmospheric corrosion on thread form and rod body during ocean freight and site storage up to 24 months
- Thread end protection: plastic thread caps on both ends of all chemical anchor rods — protects thread form from handling damage; damaged threads cause anchor installation failure (rod cannot be seated at full embedment depth)
- HDG rods: individual protective wrapping to prevent zinc coating damage during transport — zinc surface must be intact for installation; damaged zinc creates uncoated spots at concrete interface that initiate underfloor corrosion
- Resin cartridges: packed per manufacturer’s packaging in temperature-controlled shipment where ambient temperature exceeds +30°C — resin must not be exposed to frost or high heat during transit; storage temperature range per ETA product data sheet must be maintained throughout supply chain
- ISPM-15 heat-treated timber crates for all international export; heavy rods (M36 and above) individually crated and secured against movement
- Documentation: packing list, EN 10204 MTC, ETA document copies, resin batch certificates, and coating certificates enclosed with each shipment — cross-referenced to each rod bundle tag
4.5 — ISO and Quality System Compliance
ISO 9001:2015
Quality Management System covering raw material procurement, thread rolling and straightening process control, heat treatment verification, coating process QC, dimensional inspection, hardness testing, and full lot traceability. Mandatory for EPC, structural, and O&G project procurement qualification. RR Hydraulic holds current ISO 9001:2015 certification with scope covering threaded rod and anchor bolt manufacture.
EN 1992-4 (Eurocode 2 Part 4)
Structural design of fastenings for use in concrete. The governing design standard for all chemical anchor calculations on European and international EPC projects. Defines calculation methods for all failure modes (bond, concrete cone, splitting, steel, combined), safety factors, installation categories, and supplemental reinforcement effects. Project structural engineers must use EN 1992-4 with ETA product data for code-compliant chemical anchor design.
ISO 10474
Steel and steel products — inspection documents. Source framework for EN 10204 certificate types. Some legacy EPC project and civil engineering specifications reference ISO 10474 Type 3.1.B (= EN 10204 3.1) for anchor rod material certification. RR Hydraulic provides documentation in either format and cross-maps certificate types for legacy specification compliance.
ISO 4413
Safety requirements for hydraulic fluid power systems. Chemical anchors used to secure hydraulic power unit (HPU) base frames, hydraulic accumulator mounts, and hydraulic pump plinth foundations must be designed per EN 1992-4 and manufactured to the material and corrosion standards relevant to the installation environment. HPU foundations in chemical or offshore environments require SS or HDG rods per the exposure category analysis.
Submit your anchor schedule, rod grade, resin type, substrate class, and quantity to RR Hydraulic for a complete, certified commercial offer.