Chemical Process Pump Mechanical Seals

Corrosion-resistant single and double seals for ANSI and ISO chemical process pumps — built to API 682 and supplied to spec.

Request a quote →Talk to an engineer

At a glance

01API 682 single & double
02SiC/SiC
03FFKM / PTFE secondaries
04Goulds, Durco & other ANSI pumps
05Custom

We are the manufacturer, not a reseller — so we match the seal to the duty, build it in-house, and supply it at quantities that work for a distributor, an OEM or a maintenance department. Below is how we approach chemical process pump sealing.

API 682engineered to the process-industry seal standard

Double sealsbarrier-fluid arrangements for hazardous media

FFKM readythe elastomer most corrosives can’t touch

Why chemical sealing punishes the wrong choice

Corrosion attacks every part — faces, springs, hardware and elastomers all have to survive the media, not just the faces.
Crystallizing and polymerizing media foul the seal faces; the flush plan matters as much as the seal.
Hazardous and toxic duty needs a double seal with a barrier fluid — a single seal is a leak waiting to happen.
Temperature swings distort faces and harden the wrong rubber; FFKM and metal hardware are the safe path.

Range

What we supply

From off-the-shelf replacements to fully engineered custom seals — at the quantities your operation actually orders.

Single seals

Balanced and unbalanced single seals in SiC/SiC with FFKM or PTFE secondaries for ANSI and ISO pumps.

API 682 double seals

Pressurized and unpressurized double-seal cartridges with barrier-fluid arrangements for hazardous service.

Custom & OEM-compatible

Built to Goulds, Durco and other ANSI B73.1 dimensions, or machined from a sample for obsolete pumps.

Match the seal to the duty

The right face pair and secondary are set by the media and the conditions — not by what a catalogue stocks. The table is a starting point; send us the duty and we confirm it.

Media	Face pair	Elastomer	Arrangement
Strong acids	SiC / SiC	FFKM	Single or double + barrier
Solvents	SiC / Carbon	FFKM / PTFE	Single, well-flushed
Caustics	SiC / SiC	EPDM	Single
Hazardous / toxic	SiC / SiC	FFKM	Double seal, barrier fluid

FFKM resists what FKM and EPDM cannot. Hazardous or toxic media should always run a double seal with a barrier fluid — not a single seal.

From our catalog

PTFE bellows seals in our catalog

PTFE bellows seals from our catalog, a common choice on chemical pumps. Other sizes are built from a drawing, a part number or the old seal.

Model	Standard sizes (d1)	Pressure	Speed	Temperature
WM 152	25 – 65 mm	≤ 0.5 MPa	≤ 10 m/s	≤ 120 °C
WM WB2	1" – 2 3/8" · 25 – 65 mm	≤ 1.0 MPa	≤ 10 m/s	-20 to +180 °C
WM 10T	1" – 2"	≤ 0.5 MPa	≤ 10 m/s	≤ 120 °C

Limits as printed in our catalog for each model; the real limit depends on the face pair, elastomer and fluid.

Drawings & dimensions

Drawings and dimension tables

Dimensions in mm unless a table says inches. Inch sizes are named by the nominal shaft size in inches; d1 gives the same size in mm. Letters match the section drawing. Standard sizes shown; other sizes are built from a drawing or the old seal.

Catalog model

WM 152

Pressure: ≤ 0.5 MPa
Speed: ≤ 10 m/s
Temperature: ≤ 120 °C

Rotary ring: Carbon, SiC, tungsten carbide
Stationary ring: Ceramic, SiC, tungsten carbide
Secondary seals: NBR, EPDM, Viton
Spring and metal parts: 304 stainless, 316 stainless

Model	d1 (mm)	d7	d3	l1	l2	l3
WM152-25	25	60	48	13	42	45
WM152-30	30	67	53	13	42	45
WM152-35	35	72	58	13	42	45
WM152-40	40	78	63	13	42	45
WM152-45	45	84	68	16	44	46
WM152-50	50	88	73	16	46	46
WM152-55	55	95	78	16	46	46
WM152-60	60	100	83	17	46	46
WM152-65	65	105	88	17	46	46

Catalog model

WM WB2

Pressure: ≤ 1.0 MPa
Speed: ≤ 10 m/s
Temperature: -20 to +180 °C

Stationary ring: Ceramic, SiC, tungsten carbide
Rotary ring: Carbon, SiC, tungsten carbide
Secondary seals: NBR, EPDM, Viton
Spring and pressed parts: Steel

WMWB2 · Inch sizes

Model	d (mm)	d3	d7	d2	l1	l2	l3
WMWB2-1"	25.4	60	54	42.86	17.5	42	45
WMWB2-1 1/8"	28.6	67	60	46.03	27	42	45
WMWB2-1 1/4"	31.75	69	65	50.8	27	42	45
WMWB2-1 3/8"	34.93	72	68	53.98	27	42	45
WMWB2-1 1/2"	38.1	76	71	57.15	27	42	45
WMWB2-1 5/8"	41.28	80	78	63.5	27	42	45
WMWB2-1 3/4"	44.45	84	81	66.68	27	44	46
WMWB2-1 7/8"	47.63	86	84	69.85	27	44	46
WMWB2-2"	50.8	90	87	73.03	27	46	46
WMWB2-2 1/8"	53.98	95	97	79.38	33.5	46	46
WMWB2-2 1/4"	57.15	98	100	82.55	33.5	46	46
WMWB2-2 3/8"	60.3	100	103	85.73	33.5	46	46

WMWB2 · Metric sizes

Model	d (mm)	d3	d7	d2	l1	l2	l3
WMWB2-25	25	60	60	47	27	42	45
WMWB2-30	30	67	67	53	27	42	45
WMWB2-32	32	69	64	50.7	27	42	45
WMWB2-35	35	72	70	57	27	42	45
WMWB2-40	40	78	76	62	26	42	45
WMWB2-45	45	84	82	67	27	44	46
WMWB2-50	50	88	86	72	27	46	46
WMWB2-55	55	95	90	77	27	46	46
WMWB2-60	60	100	95	82	27	46	46
WMWB2-65	65	105	100	87	27	46	46

Catalog model

WM 10T

Usually corresponds to the John Crane Type 10R / 10T style.

WM 10T section drawing with dimension letters

Pressure: ≤ 0.5 MPa
Speed: ≤ 10 m/s
Temperature: ≤ 120 °C

Rotary ring: Carbon, SiC, tungsten carbide
Stationary ring: Ceramic, SiC, tungsten carbide
Secondary seals: NBR, EPDM, Viton
Spring and metal parts: 304 stainless, 316 stainless

Model	d1 (mm)	d3	d7	d2	l1	l2
WM10R WM10T-1"	25.4	60	54	42.89	17.6	33.2
WM10R WM10T-1 1/8"	28.6	67	65	50.8	27	36.2
WM10R WM10T-1 1/4"	31.75	69	68	53.98	27	37.2
WM10R WM10T-1 3/8"	34.93	72	71	57.15	27	38.2
WM10R WM10T-1 1/2"	38.1	76	78	63.5	27	38.2
WM10R WM10T-1 5/8"	41.28	80	81	66.68	27	40.2
WM10R WM10T-1 3/4"	44.45	84	84	69.85	27	40.2
WM10R WM10T-1 7/8"	47.63	86	87	73.03	27	43.2
WM10R WM10T-2"	50.8	90	97	79.38	33.3	43.2

FAQ

Chemical Process Pump Seal FAQ

When do I need a double seal?

Whenever the media is hazardous, toxic, flammable or simply too valuable to leak. A double seal with a barrier fluid keeps the process off the atmosphere and gives early warning of a failure.

What faces and elastomers for acids?

Silicon-carbide on silicon-carbide faces with FFKM (perfluoroelastomer) secondaries handle the widest range of acids. EPDM works for many caustics but fails on solvents and oils.

Do you build to API 682?

Yes. We supply API 682 single and double cartridge seals to the standard’s arrangement and piping-plan requirements, sized to ANSI B73.1 and ISO 2858 pumps.

Source Chemical Process Pump Seals At Scale

OEM-compatible, custom-machined and private-label seals built in-house to your spec, at low minimums. Send the seal drawing, the seal model or a sample and we’ll quote.

Request a quote →All seal types