IS 4643:1984 is the Indian Standard (BIS) for suction wrenches for fire brigade use. This standard specifies the requirements for materials, shape, dimensions, and finish of suction wrenches used by fire brigades for tightening and loosening suction hose couplings.
Specification for suction wrenches for fire brigade use
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Material Option 1 | Leaded Tin Bronze, Grade LTB2 (as per IS 318) | Malleable cast iron | DIN 14822-2:2018 |
| Primary Material Option 2 | Aluminium Alloy, Designation 4270 (as per IS 617) | Forged Aluminium Alloy (e.g., AlCu4MgSi) | DIN 14822-2:2018 |
| Overall Length (for approx. 100mm coupling size) | 375 mm (for 100 mm wrench) | 425 mm ± 10 mm (for 'BC' spanner) | DIN 14822-2:2018 |
| Proof Load Test (Concept) | Withstand a bending moment of 30 kgf·m (~294 Nm) at the jaw without permanent set (for 100 mm wrench). | Withstand a bending test with a force of 1000 N applied at the handle end without fracture (for 'BC' spanner). | DIN 14822-2:2018 |
| Functional Geometry Basis | Hook spanner ('C' shape) for round threaded couplings. | Lug spanner for hermaphroditic (Storz) couplings. | DIN 14822-2:2018 |
| Marking Requirement | Manufacturer's mark, size, and ISI mark. | Manufacturer's mark, year of manufacture, standard number, and size (e.g., 'BC'). | DIN 14822-2:2018 |