Chemlogic AILower tier COMAH site
DemoIllustrative data for a fictional site. Not a real customer.

What can I take

How much more of each substance the site could safely accept, and which tank it should go in.

Headroom is the room left before crossing into upper tier.

  • Methanol772 t
    Limited by the COMAH thresholdBest tank TK-101 (580 t)
    How this was worked out

    Taking more would push the site over a COMAH threshold.

    1. Physical capacity580 tThis one applies

      TK-101 holds 620,000 kg of 1,200,000 kg working capacity.

      Site asset register — declared working capacity

    2. Aggregate threshold772 t

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 5,000 t = 772 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Gas oil (distillate marine diesel)700 t
    Limited by tank spaceBest tank TK-104 (700 t)
    How this was worked out

    The tanks are physically full.

    1. Physical capacity700 tThis one applies

      TK-104 holds 900,000 kg of 1,600,000 kg working capacity.

      Site asset register — declared working capacity

    2. Aggregate threshold1,850 t

      Environmental hazards (Section E) sum is at 0.926 of the upper tier threshold. Remaining fraction 0.074 × qualifying quantity 25,000 t = 1,850 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Toluene320 t
    Limited by tank spaceBest tank TK-103 (320 t)
    How this was worked out

    The tanks are physically full.

    1. Physical capacity320 tThis one applies

      TK-103 holds 1,180,000 kg of 1,500,000 kg working capacity.

      Site asset register — declared working capacity

    2. Aggregate threshold7,720 t

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 50,000 t = 7,720 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 1, entry P5c

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Propane (commercial LPG)30.9 t
    Limited by the COMAH thresholdBest tank VS-301 (30.9 t)
    How this was worked out

    Taking more would push the site over a COMAH threshold.

    1. Aggregate threshold30.9 tThis one applies

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 200 t = 30.9 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories

    2. Physical capacity40 t

      VS-301 holds 20,000 kg of 60,000 kg working capacity.

      Site asset register — declared working capacity

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Ammonia, anhydrous14.8 t
    Limited by the COMAH thresholdBest tank VS-302 (14.8 t)
    How this was worked out

    Taking more would push the site over a COMAH threshold.

    1. Aggregate threshold14.8 tThis one applies

      Environmental hazards (Section E) sum is at 0.926 of the upper tier threshold. Remaining fraction 0.074 × qualifying quantity 200 t = 14.8 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories

    2. Physical capacity50 t

      VS-302 holds 40,000 kg of 90,000 kg working capacity.

      Site asset register — declared working capacity

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Copper(II) sulphate solution 25%10 t
    Limited by tank spaceBest tank RB-501 (10 t)
    How this was worked out

    The tanks are physically full.

    1. Physical capacity10 tThis one applies

      RB-501 holds 30,000 kg of 40,000 kg working capacity.

      Site asset register — declared working capacity

    2. Aggregate threshold14.8 t

      Environmental hazards (Section E) sum is at 0.926 of the upper tier threshold. Remaining fraction 0.074 × qualifying quantity 200 t = 14.8 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 1, entry E1

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • Dibenzoyl peroxide paste (Type C)10 t
    Limited by tank spaceBest tank RB-501 (10 t)
    How this was worked out

    The tanks are physically full.

    1. Physical capacity10 tThis one applies

      RB-501 holds 30,000 kg of 40,000 kg working capacity.

      Site asset register — declared working capacity

    2. Aggregate threshold30.9 t

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 200 t = 30.9 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 1, entry P6b

    3. Segregationno limit

      No compatibility rule is engaged by this substance in this zone.

      No compatibility rule engaged

  • AcrylonitrileNone
    Blocked — a tank too close by
    How this was worked out

    A nearby tank holds something this cannot be stored close to.

    1. Segregation0 kgThis one applies

      SR-07 Acute toxics separated from flammable liquids. Methanol is held in the same zone and separation cannot be demonstrated, so adding any Acrylonitrile here would create a breach.

      HSG71 §Segregation of incompatible materials; COMAH SPC Technical Measures — segregation

    2. Physical capacity0 kg

      TK-101 is in service for Methanol, not Acrylonitrile, so it offers no capacity for this substance.

      Site asset register — zone service allocation

    3. Aggregate threshold14.8 t

      Environmental hazards (Section E) sum is at 0.926 of the upper tier threshold. Remaining fraction 0.074 × qualifying quantity 200 t = 14.8 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories

  • Hydrogen peroxide 60%None
    Blocked — a tank too close by
    How this was worked out

    A nearby tank holds something this cannot be stored close to.

    1. Segregation0 kgThis one applies

      SR-01 Oxidising liquids/solids separated from flammable liquids. Methanol is held in the same zone and separation cannot be demonstrated, so adding any Hydrogen peroxide 60% here would create a breach.

      HSG71 §Segregation of incompatible materials, Table 2; CLP Annex I classes 2.13 / 2.6

    2. Physical capacity0 kg

      TK-101 is in service for Methanol, not Hydrogen peroxide 60%, so it offers no capacity for this substance.

      Site asset register — zone service allocation

    3. Aggregate threshold30.9 t

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 200 t = 30.9 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 1, entry P8

  • Nitric acid 68%None
    Blocked — a tank too close by
    How this was worked out

    A nearby tank holds something this cannot be stored close to.

    1. Segregation0 kgThis one applies

      SR-01 Oxidising liquids/solids separated from flammable liquids. Methanol is held in the same zone and separation cannot be demonstrated, so adding any Nitric acid 68% here would create a breach.

      HSG71 §Segregation of incompatible materials, Table 2; CLP Annex I classes 2.13 / 2.6

    2. Physical capacity0 kg

      TK-101 is in service for Methanol, not Nitric acid 68%, so it offers no capacity for this substance.

      Site asset register — zone service allocation

    3. Aggregate threshold30.9 t

      Physical hazards (Section P + O) sum is at 0.846 of the upper tier threshold. Remaining fraction 0.154 × qualifying quantity 200 t = 30.9 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 1, entry P8

  • Sodium hypochlorite solution 14%None
    Blocked — a tank too close by
    How this was worked out

    A nearby tank holds something this cannot be stored close to.

    1. Segregation0 kgThis one applies

      SR-10 Active-chlorine releasing substances separated from flammable liquids. Methanol is held in the same zone and separation cannot be demonstrated, so adding any Sodium hypochlorite solution 14% here would create a breach.

      HSG95 §Hypochlorite storage; HSG71 Table 2

    2. Physical capacity0 kg

      TK-101 is in service for Methanol, not Sodium hypochlorite solution 14%, so it offers no capacity for this substance.

      Site asset register — zone service allocation

    3. Aggregate threshold37 t

      Environmental hazards (Section E) sum is at 0.926 of the upper tier threshold. Remaining fraction 0.074 × qualifying quantity 500 t = 37 t to stay below upper tier on this group.

      COMAH 2015 Sch. 1 Pt. 3, Note 4 — summation rule; COMAH 2015 Sch. 1 Pt. 2 — named substances take precedence over Part 1 categories