Learn it before you lift it
Knowledge base
Selection, inspection and care guides for wire rope, slings, shackles, hooks and mooring ropes — written by the team that proof-loads them on our own 1,200 T test bed.
UHMWPE, HMPE and Dyneema Rope: The Buyer’s Guide
UHMWPE, UHMPE and HMPE name one fibre class; Dyneema and Spectra are fibre brands; Plasma and Plateena are ropes. Where HMPE replaces steel wire rope, where it never does, and what to demand on the certificate when no Indian Standard covers it.
HMPE Rope in Indian Coastal Service: UV and Abrasion
Sun, salt and grit decide how long an HMPE rope lasts on an Indian coast — and the fibre grade is not the lever. Diameter, construction, coating and chafe protection are.
What Standard Does HMPE Rope Come Under?
India has no BIS standard for HMPE rope. What IS 14928 and IS 9944 actually cover, where ISO 10325 and ISO 2307 fit, and what a purchase order and a test certificate have to carry instead.
Inspecting and Retiring HMPE Rope
The steel discard rules do not transfer to a braided fibre rope, and no Indian Standard replaces them. What a competent person actually looks for on an HMPE rope, what the rope maker's published criteria say, and how often to look.
HMPE Mooring and Towing Lines
HMPE mooring and towing lines sit under SOLAS II-1/3-8, not the lifting-gear rules. The design figures, the low-stiffness-tail warning, current snap-back practice, and what an Indian purchase order must say when no IS covers the rope.
Creep in HMPE Rope, and How to Design Around It
Creep is permanent stretch under sustained load, and it decides whether HMPE suits a permanently tensioned line. What drives it, where it governs the design, and how to specify and inspect around it.
Cable-Laid Grommets and Cable-Laid Slings
What a cable-laid grommet is, how one is formed and hand-spliced, why the core is laid in and never cut out, how its rated capacity is arrived at, and which documents govern it in India.
Wire Rope Sling vs Chain Sling vs Webbing Sling: Which to Use When
Chain for heat and abrasion, wire rope for general duty, webbing for finished surfaces — how to pick the right sling family for the lift, with Indian standards and certification covered.
When to Discard a Wire Rope: IS 3973 and ISO 4309 Criteria Explained
Broken wires, diameter loss, corrosion, deformation, heat damage — the discard criteria of IS 3973 and ISO 4309 by clause, the dock-work statutory test, and why any single failed check condemns the rope.
Shackle Size Selection: Reading WLL Markings and Matching Pin Diameter
Select shackles by marked WLL, not by appearance — how to read the forged markings, match pin diameter and jaw to the connection, and choose bow vs dee, screw pin vs safety bolt.
Mooring Rope Selection: Nylon vs Polypropylene vs HMPE for Indian Ports
Nylon absorbs surge, polypropylene wins on price and buoyancy, HMPE wins on strength-to-weight — how to match mooring line fibre to Indian berth conditions under SOLAS II-1/3-8.
Chain Block vs Lever Hoist: Choosing the Right Manual Hoist
Chain blocks lift vertically from a fixed point; lever hoists pull, tension and lift at any angle. How to choose between them, and the IS 3832 and examination requirements both share.
Electric Hoist Selection Guide: Capacity, Duty Cycle and Mounting
How to choose the right electric hoist — capacity, FEM/ISO duty classification, mounting type, lifting speed and power requirements.
Load Testing Explained: Proof Load, Break Load and Periodic Tests
Proof load vs break load testing, why the proof factor depends on the product standard, periodic examination in India, and our 1,200 T proof-load test bed.
IS Standards for Lifting Equipment in India
Which IS standard covers which lifting gear: IS 2760 chain slings, IS 6215 Grade 80 chain, IS 3832 chain blocks, IS/ISO 2415 shackles, IS 2266 wire rope, and more.
Shackle Types and Applications: Bow, Dee, Safety Pin Grade Guide
Complete guide to shackle types — bow vs dee, screw pin vs bolt vs safety pin, material grades and EN 13889 / IS/ISO 2415 standards.
Webbing Sling Selection: Colour Codes & Hitches
How to choose a webbing sling — EN 1492 colour codes, hitch and angle factors, edge protection, UV-safe storage, and port-duty selection tips for India.
Polyester vs Polypropylene Rope: Properties, Strengths & Best Uses
Compare polyester and polypropylene rope on stretch, UV resistance, strength, floatation and cost — and when to use each.
Anchor Chain Selection Guide: Stud-Link, Grades & Sizing
How to select anchor chain — stud-link vs open-link, U2 vs U3 grades, diameter tables, and ABS / Lloyd's Register requirements.
How to Read a Lifting Equipment Test Certificate
Read and verify a lifting equipment test certificate field by field — identification, rating, proof load and its standard, examiner and register checks.
Wire Rope Construction Guide: 6×19, 6×36
Decode 6x19, 6x36, 18x7 and 35x7 wire rope constructions — cores, lay types and strand patterns — and match construction to sheaves, drums and duty.
Dyneema vs Steel Wire Rope: Full Comparison Guide
Dyneema UHMWPE vs steel wire rope compared — weight, strength, cost, and handling. Which is right for your application?
WLL vs SWL Explained: Are They the Same?
WLL and SWL name the same rated capacity. Learn where each term comes from, how it relates to proof load and MBL, and how to read a sling tag correctly.
Bow Shackle vs D-Shackle: Which to Use
Bow shackle vs D-shackle explained — why multi-leg and angled pulls need a bow shackle, pin types, IS/ISO 2415 and EN 13889 context, and inspection points.
Manual vs Electric Hoist: How to Choose
Manual chain block or electric hoist? A practical comparison of duty cycle, power availability, speed, operator fatigue, cost and Indian certification.
Grade 80 vs Grade 100 Chain: Which to Choose
Grade 80 vs Grade 100 lifting chain compared: tensile strength, WLL by diameter, standards in India and Europe, and when stepping up to G100 is worth it.
DGFASLI & Factories Act Compliance Explained
Who recognises the competent person for lifting gear in India — state Chief Inspector of Factories, DGFASLI for docks — and the 6- and 12-month examination cycles.
Heavy-Lift Rigging for Bridge Projects
The rigging and lifting challenges behind major infrastructure like the Chenab Rail Bridge, and how certified gear supports large-scale construction.
EN 1677 & EN 818 Chain Sling Standards
What EN 818 (short-link chain) and EN 1677 (sling components) cover, how they map to IS 6215 and IS 2760 in India, and how to verify compliance markings.
Form 5 & Form 11 Certificates Explained
What Sealinkers' Form 5 and Form 11 lifting-gear certificates record, how they fit the Factories Act examination cycle, and why form numbers differ by state.
Wire Rope Inspection Checklist & Discard
Full wire rope inspection checklist for Indian sites — broken wires, corrosion, diameter loss, bird caging — with IS 3973 and ISO 4309 discard guidance.
Sling Angle Effects on Safe Working Load
How sling angle multiplies leg tension — the formula, angle-factor table, worked examples, why 4-leg slings rate on 3 legs, and how to keep angles safe.
Introduction to Anchors: Types, Scope & Chain
A guide to marine anchor types, scope ratios, and stud-link chain inspection — from Sealinkers, Mumbai riggers since 1977.
Cortland Plasma 12×12 Dyneema Rope
Discover Cortland Plasma 12×12 Dyneema rope. Ultra-light, high-strength HMPE rope for heavy lifting, stocked and supplied in India by Sealinkers.
Wire RopeWire Rope Materials, Finishes & Coatings
Compare bright, galvanised, stainless and PVC-coated wire rope under IS 2266 — finishes, cores and coatings, and how to pick the right combination.
Shackles & FittingsSL-450 vs U-Clamps: Wire Rope Termination Guide
Compare swaged SL-450 fittings vs ordinary U-bolt clamps for wire rope terminations, including typical strength efficiency. Guide from Sealinkers Mumbai.
Wire Rope Lubrication Guide
Why wire rope lubrication matters, penetrating vs coating lubricants, re-lubrication signs and IS 3973-aligned field practice from Sealinkers, Mumbai.
Bird Caging of Wire Rope Explained
What bird caging is, why it means immediate discard, common causes like shock loading, and prevention practice from Sealinkers' DGFASLI test house.
SlingsHow to take care and maintain ZEBRA Polyester Sling
Polyester webbing slings are an essential tool in many industries, from construction and transportation to manufacturing and warehousing.
Heavy-Lift EngineeringRoRo Ferry Bridge Lifts: Rigging a Linkspan
What makes lifting a RoRo linkspan a distinct rigging challenge — level control, marine corrosion, tidal windows, and certified gear.
Heavy-Lift EngineeringNuclear Dome Lifts: The Rigging Engineering Challenge
What makes a nuclear containment dome lift one of the hardest single lifts in heavy engineering — safety factors, load monitoring, and certified gear.
Need it tested, not just explained?
Our in-house test house proof-loads lifting gear on a 1,200 T proof-load test bed and issues a test certificate in our own name for every item.