Question 1

What's the main difference between TekRisk and PHAST?

Accepted Answer

PHAST is mainly a Windows desktop application with individual or network licenses; DNV also offers Phast Online, a set of focused web apps. TekRisk runs entirely in the browser. Both cover pool fire, jet fire, fireball, VCE and dispersion; TekRisk also includes fault trees and event trees, publishes its formulas and benchmarks, and has a permanent free plan with Pro at US$59.99/month.

Question 2

Can I import my PHAST projects into TekRisk?

Accepted Answer

No. TekRisk does not read PHAST files: scenarios are recreated by entering the same inputs. Once in TekRisk, scenarios can be exported as .tkrm files on every plan and imported into another account on Pro.

Question 3

Are TekRisk calculations as accurate as PHAST?

Accepted Answer

TekRisk implements published methods: SLAB (Lawrence Livermore National Laboratory) for dense gas dispersion, the TNO Yellow Book for physical effects and TNO Green Book and Eisenberg probits. For a vertical LPG jet fire, TekRisk reproduces a real Phast 6.7 report within 2 % in flame geometry and ground-level radiation. The cases, their deviations and the models not yet benchmarked are listed on the model validation page (tekrisk.com/en/docs/validation).

Question 4

What help is there to get started coming from PHAST?

Accepted Answer

A guided tour inside TekRisk takes you from an empty project to a calculated scenario in about five minutes, and the public documentation (tekrisk.com/en/docs) explains each model with its formulas and references. The free plan includes the documentation, and Pro adds priority support.

Feature	TekRisk	PHAST	Advantage
Cloud-Based	Included	Phast Online	Equal
No Installation Required	Included	Phast Online	Equal
Multi-Language Support	Included	Not included	TekRisk Advantage
Pool Fire Model	Included	Included	Equal
Jet Fire Model	Included	Included	Equal
Fireball / BLEVE	Included	Included	Equal
Vapor Cloud Explosion (VCE)	Included	Included	Equal
Flash Fire	Included	Included	Equal
Toxic Dispersion	Included	Included	Equal
Fault and Event Trees	Included	Not included	TekRisk Advantage
Published Validation	Included	Included	Equal
PDF Reports	Included	Included	Equal
Pricing	Free · Pro US$59.99/mo	US$5,000+/yr	TekRisk Advantage
Free Tier Available	Included	Not included	TekRisk Advantage
Chemical Database	+1300	+1500	Advantages PHAST
3D Visualization	Not included	Included	Advantages PHAST

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