Should I choose 304L or 316L for a pineapple, orange or tomato pulp line?

Fruit pulp and juice are acidic and often sweetened or salted, and chlorides plus acid attack 304, so 316L is usually the safer choice. 304L suits wash water and dry-side lines. Send us your product and CIP chemistry and we'll confirm the grade. Our internal Ra of 0.4 µm or better sits inside the usual food band of 0.8 µm.

Do tea gardens and tea-packing plants need electropolished pipe?

Not for making black tea, which is withering, rolling and drying. Electropolished pipe pays off on liquid-tea, extract and ready-to-drink lines, fruit pulp and juice, dairy, and clean utilities, where a smooth surface is easier to clean. Tell us your process and we'll say honestly whether it fits.

We buy for a plant in Sikkim or the north-east. Can you quote to that location, or to a depot in Siliguri?

Tell us the delivery location when you enquire, and we'll quote to it, or to a Siliguri depot if you prefer. At this distance, consolidated orders spread the freight better, so send your full requirement together, and we can combine it with a Kolkata order in one dispatch. For a few plain lengths, a local stockist is often cheaper, and we'll say so.

Home›Market Areas›West Bengal›Siliguri

ISO 9001:2015 Manufacturer · Mumbai

Electropolished Pipes & Tubes Manufacturer and Supplier in Siliguri

Siliguri is North Bengal's commercial hub and the gateway to Sikkim and the north-east, with a food, feed and tea-processing park at Dabgram and a fruit belt in the hills around it. We manufacture and electropolish SS 304L and 316L pipes and tubes, in western India, and ship to Siliguri's food, beverage and dairy plants, with MTC EN 10204 3.1, 100% PMI testing and a measured Ra report on every order.

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Verified Quality:ISO 9001:2015•EN 10204 3.1 MTC•100% PMI Tested•Internal Ra ≤0.4 µm•ASTM A269 / A270

Regional Capability

Electropolished Pipe for Siliguri's Industrial Belts

Zone / MIDC	Typical End-Use	Application	Our Usual Spec
Dabgram Industrial Park, Fulbari (about 48 units)	Food and tea processing, feed, engineering, plastics	Hygienic transfer, wash lines, CIP, clean utility	304L; 316L for chloride-bearing wash or sanitiser
Fruit, pulp and juice processing (pineapple, orange, tomato)	Fruit and vegetable processing, beverages	Pulp and juice transfer, CIP, clean utility	316L for acidic pulp and juice; 304L for wash water
Tea blending, packing and ready-to-drink tea	Tea packaging, instant and ready-to-drink tea	Mostly dry; liquid-tea and extract lines only	304L
Dairy and milk handling in North Bengal	Milk reception and processing	Milk transfer, CIP, clean utility	304L, internal Ra ≤0.4 µm
Matigara, Phansidewa and Naxalbari belts	Mixed light manufacturing and agro	Hygienic transfer, clean utility	304L
Healthcare and pharma units	Hospitals, labs and a few pharma units	Laboratory and clean-utility lines, small lots	316L / 304L
Timber, tourism, transport and warehousing	Wood, hospitality, logistics	Not a fit	n/a

Fruit pulp, juice and ready-to-drink lines

A smooth, passivated interior that cleans easily and doesn't hold pulp or sugar residue, with 316L where acidity calls for it.

Dairy and milk handling

Hygienic tubing for milk transfer and CIP.

Wet tea and extract lines

Hygienic tubing for liquid-tea and extract processing, where the plant has it.

CIP and SIP lines

A smooth bore cleans faster and drains better, which matters for caustic and acid wash cycles.

Small units and fabricators

Cut lengths and custom sizes in small lots, with the same document pack as large orders.

New-build food plants

Quotes against your drawings and specification at design stage.

Local Buying Notes for Siliguri:

Pineapple and tomato are acidic. Fruit pulp and juice are acidic and often sweetened or salted, and chlorides plus acid attack 304. For pulp and juice lines, 316L is usually the safer grade, and 304L suits wash water and dry-side lines. Tell us your product and CIP chemistry and we'll confirm the grade.
Tea making is mostly dry. Withering, rolling and drying don't need electropolished pipe. We'd rather tell you than sell you something you don't need. Liquid-tea, extract and ready-to-drink lines are different, and we'll say honestly if yours is one.
We're the farthest supplier you'll consider, and we'll say so. For a few plain lengths, a Kolkata or Siliguri stockist will be cheaper. We're the better choice when you need a measured Ra, heat-number traceability, a particular size or finish, or the full document pack.
If your project has a fixed date, tell us when you enquire and we'll say plainly whether it fits.
Heavy rain and humidity. The foothills are very wet. We cap the pipe ends and sleeve every length, and we recommend keeping the sleeves on until installation, as humid storage can mark an electropolished surface.
Siliguri is where the north-east buys from. If your order is for a plant in Sikkim or the north-east, tell us the delivery location when you enquire and we'll quote to it, or to a Siliguri depot if you prefer.
Send the whole requirement at once. If you also buy for Kolkata, send the requirements together and we'll quote one consolidated dispatch with one document format.

Technical Parameters

Technical Specification Tables

4A. Stainless Steel & Duplex Material Grades

Grade	UNS	WNR (EN)	Typical Process Use
SS 316L	S31603	1.4404	Pharma, biotech, WFI loops, chloride or aggressive cleaning chemicals
SS 304L	S30403	1.4307	Dairy, food, beverage, winery, general hygienic & utility lines
Duplex 2205	S31803 / S32205	1.4462	High yield strength, extreme chloride resistance, chemical & coastal duty
Super Duplex	S32750 / S32760	1.4410 / 1.4501	High-pressure aggressive acids, offshore, harsh petrochemical streams

4B. Surface Roughness: Industry Reference vs Sakshi Forge Offer

Service	Typical Industry Band	Ra µin (exact)	Sakshi Forge Offer
Pharma / biotech	Ra ≤0.25 to ≤0.4 µm	9.8 to 15.7 µin	Standard: ≤0.4 µm (ASME BPE SF4)
Dairy / food / beverage	Ra ≤0.6 to ≤0.8 µm	23.6 to 31.5 µin	Within standard offer (≤0.4 µm)
Semiconductor / UHP	Ra ≤0.13 to ≤0.25 µm	5.1 to 9.8 µin	Available on custom drawing spec

Conversions: 1 µm = 39.3701 µin; RMS (µin) ≈ Ra (µin) × 1.11. Example: Ra 0.4 µm = 15.75 µin Ra ≈ 17.5 µin RMS.

4C. Weight Formula and Illustrative Dimensions

Weight (kg/m) = (OD − WT) × WT × K, where K = 0.02491 (304/304L, 7.93 g/cm³), 0.02507 (316/316L, 7.98 g/cm³) and 0.02450 (Duplex 2205, 7.80 g/cm³).

Nominal Size	OD (mm)	WT (mm)	304L (kg/m)	316L (kg/m)	Duplex 2205 (kg/m)
½"	12.7	1.65	0.454	0.457	0.447
¾"	19.05	1.65	0.715	0.720	0.703
1"	25.4	1.65	0.976	0.982	0.960
1½"	38.1	1.65	1.498	1.508	1.473
2"	50.8	1.65	2.020	2.033	1.987

4D. Core Technical Specifications

Interactive specification explorer with live filters (DOM-preserved for search indexing)

Filter:

Grade	Type	OD Range	Wall / Schedule	Internal Ra	Standards
SS 316L	Welded	½" to 2" (12.7–50.8 mm)	1.65 mm / SCH 10S	≤0.4 µm (SF4)	ASTM A269 / A270, ASME BPE
SS 316L	Seamless	½" to 2" (12.7–50.8 mm)	1.65–2.77 mm / SCH 40S	≤0.4 µm (SF4)	ASTM A269, ASME BPE
SS 316L	Welded	2½" to 6" (63.5–152.4 mm)	2.11–2.77 mm / SCH 10S	≤0.4 µm	ASTM A269 / A270
SS 316L	Seamless	2½" to 6" (63.5–152.4 mm)	2.77–3.05 mm / SCH 40S	≤0.4 µm	ASTM A269
SS 304L	Welded	½" to 2" (12.7–50.8 mm)	1.65 mm / SCH 10S	≤0.4 µm	ASTM A269 / A270
SS 304L	Seamless	½" to 2" (12.7–50.8 mm)	1.65–2.11 mm	≤0.4 µm	ASTM A269
SS 304L	Welded	2½" to 6" (63.5–152.4 mm)	2.11–2.77 mm	≤0.4 µm	ASTM A269 / A270
SS 304L	Welded	8" to 12" (219.1–323.9 mm)	2.77–3.05 mm	≤0.4 µm	ASTM A269
Duplex 2205	Welded	½" to 2" (12.7–50.8 mm)	1.65–2.11 mm	≤0.4 µm	ASTM A790
Duplex 2205	Seamless	½" to 4" (12.7–101.6 mm)	2.11–3.05 mm	≤0.4 µm	ASTM A790
Duplex 2205	Welded	4" to 8" (101.6–219.1 mm)	2.77–3.76 mm	≤0.4 µm	ASTM A790

Service Limitations (Told Upfront):

Avoid use with hydrofluoric acid. Not recommended for abrasive transport or abrasive slurries. Not for structural applications or high-impact wear. Handle with protective sleeves to avoid mechanical scratch damage.

Engineering Utility

Live Pipe Weight & Ra Surface Roughness Calculator

Instant dimension calculation and Ra unit conversions for engineering procurement

Pipe Weight Calculator

Grade:

OD (mm):

Wall WT (mm):

Length (meters):

0.982 kg/m · 5.89 kg for 6 m

Weight formula: (OD − WT) × WT × K

Ra Surface Roughness Converter

Surface Ra (µm):

Surface Ra (µin):

≈ 17.4 µin RMS

1 µm = 39.3701 µin · RMS ≈ Ra × 1.11

In-House Workflow

The 5-Step Electropolishing and Passivation Process

01

Degreasing and Cleaning

Oils, cutting fluids and drawing residues are completely removed first. The finish is only as good as the chemical preparation.

02

Pickling / Activation

Where weld heat tint or surface oxide is present, it is etched and activated so the pipe surface electropolishes uniformly.

03

Anodic Electropolishing Bath

The pipe acts as anode in an electrolytic acid bath. High microscopic peaks dissolve first, levelling the surface and stripping free iron.

04

Passivation Stabilisation

The chromium-rich passive layer is stabilised per ASTM A967 / ASTM B912 to prevent future pitting and galvanic attack.

05

DI Water Rinse and Drying

High-purity deionised water rinse removes all electrolytic residues, followed by hot air drying, capping and clean poly-sleeving.

Auditable Records

Quality Assurance and Documentation

Document / Test	Status / Scope
MTC EN 10204 3.1 with heat-number traceability	Confirmed (Standard with every dispatch)
100% PMI test and certificate	Confirmed (Handheld XRF on every pipe length)
Ra surface roughness test (stylus profilometer) & surface report	Confirmed (Supplied with measured Ra values)
Hydro (leak and pressure) test & certificate	Confirmed (Hydrostatic tested per ASTM spec)
Passivation verification and ferrite check	Confirmed (Reported in quality dossier)
QA inspection report and mill traceability	Confirmed (Approved origin mills)
Third-party inspection (TÜV / Bureau Veritas / SGS / DNV)	Accepted upon customer request

Questions & Answers

Frequently Asked Questions: Siliguri

We dispatch from Mumbai, and delivery time depends on size, quantity and stock; it is confirmed in writing with each quotation. We cap the pipe ends, sleeve each length and pack for the journey and for the foothills' heavy rain and humidity, so the electropolished finish arrives undamaged. If your project has a fixed date, tell us when you enquire and we'll say plainly whether it fits.

24-Hour Quote

Specify Electropolished Pipe for Your Siliguri Plant

Send your grade, OD × wall, Ra requirement, length and quantity. We'll quote within 24 hours.

Our Address

Shop No. 05, Ground Floor, 113/117, Dr. MG Mahimtura Marg, 3rd Kumbharwada, Mumbai, Maharashtra 400004

Sales & Engineering Hotline

Click below to view our direct engineer phone numbers, dispatch contacts, and official sales email.

Delivery Schedule

Key Industrial Areas & Belts Served:

SiliguriDabgramFulbariMatigaraPhansidewaNaxalbariBagdograNew JalpaiguriJalpaiguri (nearby)Darjeeling (nearby)Gangtok (nearby)

Also Supplying Across West Bengal Industrial Hubs:

Electropolished pipes in Kolkata Electropolished pipes in Kalyani

National Manufacturing Specifications

Electropolished Stainless Steel Pipes Supplied to Siliguri

Every pipe we supply to Siliguri adheres to strict international hygienic standards. Explore our core product specifications, Ra roughness certifications, and alloy grade properties:

Main Product Hub

Electropolished Stainless Steel Pipes

ASME BPE SF1-SF4 and ASTM A270 compliant hygienic pipes with internal Ra ≤ 0.38 µm (15 µin). 100% PMI tested with EN 10204 3.1 MTC.

View Full Engineering Specs

Pharma & Biotech Grade

SS 316L Electropolished Pipes

High-purity SS 316L (UNS S31603) electropolished tubes engineered for sterile WFI loops, injectable formulations, and bioprocess lines.

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Food & Dairy Grade

SS 304L Electropolished Pipes

Corrosion-resistant SS 304L (UNS S30403) electropolished piping designed for hygienic food, beverage, dairy processing, and CIP/SIP systems.

View Full Engineering Specs